Change property and structure subscription to flows.

CHANGELOG.md

@@ -4,13 +4,14 @@
 ### Added
 - Server module
 - Change collector
+- Customizable accessors for colors
 
 ### Changed
 - Vision does not implement ItemProvider anymore. Property changes are done via `getProperty`/`setProperty` and `property` delegate.
 - Point3D and Point2D are made separate classes instead of expect/actual (to split up different engines.
 - JavaFX support moved to a separate module
 - Threejs support moved to a separate module
-- \[Breaking change!\] Stylesheets are moved into properties under `@stylesheet` key
+- \[Format breaking change!\] Stylesheets are moved into properties under `@stylesheet` key
 
 ### Deprecated
 

demo/muon-monitor/src/commonMain/kotlin/ru/mipt/npm/muon/monitor/Model.kt

@@ -1,7 +1,6 @@
 package ru.mipt.npm.muon.monitor
 
 import hep.dataforge.vision.removeAll
-import hep.dataforge.vision.setProperty
 import hep.dataforge.vision.solid.*
 import ru.mipt.npm.muon.monitor.Monitor.CENTRAL_LAYER_Z
 import ru.mipt.npm.muon.monitor.Monitor.LOWER_LAYER_Z
@@ -63,7 +62,6 @@ class Model {
 
     fun reset() {
         map.values.forEach {
-            it.config
             it.setProperty(SolidMaterial.MATERIAL_COLOR_KEY, null)
         }
         tracks.removeAll()

visionforge-core/src/commonMain/kotlin/hep/dataforge/vision/StyleSheet.kt

@@ -11,7 +11,7 @@ import hep.dataforge.names.plus
  */
 public inline class StyleSheet(private val owner: VisionGroup) {
 
-    private val styleNode get() = owner.properties?.get(STYLESHEET_KEY).node
+    private val styleNode get() = owner.getOwnProperty(STYLESHEET_KEY).node
 
     public val items: Map<NameToken, Meta>? get() = styleNode?.items?.mapValues { it.value.node ?: Meta.EMPTY }
 
@@ -21,11 +21,7 @@ public inline class StyleSheet(private val owner: VisionGroup) {
      * Define a style without notifying owner
      */
     public fun define(key: String, style: Meta?) {
-        if (style == null) {
+        owner.setProperty(STYLESHEET_KEY + key, style)
-            styleNode?.remove(key)
-        } else {
-            owner.config[STYLESHEET_KEY + key] = style
-        }
     }
 
     /**
@@ -58,7 +54,7 @@ internal fun Vision.styleChanged(key: String, oldStyle: Meta?, newStyle: Meta?)
         val tokens: Collection<Name> =
             ((oldStyle?.items?.keys ?: emptySet()) + (newStyle?.items?.keys ?: emptySet()))
                 .map { it.asName() }
-        tokens.forEach { parent?.propertyChanged(it) }
+        tokens.forEach { parent?.notifyPropertyChanged(it) }
     }
     if (this is VisionGroup) {
         for (obj in this) {
@@ -78,7 +74,7 @@ public val VisionGroup.styleSheet: StyleSheet get() = StyleSheet(this)
  * Add style name to the list of styles to be resolved later. The style with given name does not necessary exist at the moment.
  */
 public fun Vision.useStyle(name: String) {
-    styles = (properties[Vision.STYLE_KEY]?.stringList ?: emptyList()) + name
+    styles = (getOwnProperty(Vision.STYLE_KEY)?.stringList ?: emptyList()) + name
 }
 
 
@@ -86,7 +82,7 @@ public fun Vision.useStyle(name: String) {
  * Find a style with given name for given [Vision]. The style is not necessary applied to this [Vision].
  */
 public tailrec fun Vision.getStyle(name: String): Meta? =
-    properties?.get(StyleSheet.STYLESHEET_KEY + name).node ?: parent?.getStyle(name)
+    getOwnProperty(StyleSheet.STYLESHEET_KEY + name).node ?: parent?.getStyle(name)
 
 /**
  * Resolve an item in all style layers

visionforge-core/src/commonMain/kotlin/hep/dataforge/vision/Vision.kt

@@ -10,13 +10,14 @@ import hep.dataforge.provider.Type
 import hep.dataforge.values.asValue
 import hep.dataforge.vision.Vision.Companion.TYPE
 import hep.dataforge.vision.Vision.Companion.VISIBLE_KEY
+import kotlinx.coroutines.flow.Flow
 import kotlinx.serialization.Transient
 
 /**
  * A root type for display hierarchy
  */
 @Type(TYPE)
-public interface Vision : Configurable, Described {
+public interface Vision : Described {
 
     /**
      * The parent object of this one. If null, this one is a root.
@@ -25,42 +26,52 @@ public interface Vision : Configurable, Described {
     public var parent: VisionGroup?
 
     /**
-     * Nullable version of [config] used to check if this [Vision] has custom properties
+     * A fast accessor method to get own property (no inheritance or styles
      */
-    public val properties: Config?
+    public fun getOwnProperty(name: Name): MetaItem<*>?
 
     /**
-     * All properties including styles and prototypes if present, including inherited ones
+     * Get property.
+     * @param inherit toggles parent node property lookup
+     * @param includeStyles toggles inclusion of
      */
-    public val allProperties: Laminate
+    public fun getProperty(
+        name: Name,
+        inherit: Boolean = true,
+        includeStyles: Boolean = true,
+        includeDefaults: Boolean = true,
+    ): MetaItem<*>?
+
 
     /**
-     * Get property (including styles). [inherit] toggles parent node property lookup
+     * Set the property value
      */
-    public fun getProperty(name: Name, inherit: Boolean = true): MetaItem<*>?
+    public fun setProperty(name: Name, item: MetaItem<*>?)
 
     /**
-     * Trigger property invalidation event. If [name] is empty, notify that the whole object is changed
+     * Flow of property invalidation events. It does not contain property values after invalidation since it is not clear
+     * if it should include inherited properties etc.
      */
-    public fun propertyChanged(name: Name): Unit
+    public val propertyInvalidated: Flow<Name>
+
 
     /**
-     * Add listener triggering on property change
+     * Notify all listeners that a property has been changed and should be invalidated
      */
-    public fun onPropertyChange(owner: Any?, action: (Name) -> Unit): Unit
+    public fun notifyPropertyChanged(propertyName: Name): Unit
-
-    /**
-     * Remove change listeners with given owner.
-     */
-    public fun removeChangeListener(owner: Any?)
 
     /**
      * List of names of styles applied to this object. Order matters. Not inherited.
      */
     public var styles: List<String>
-        get() = properties[STYLE_KEY]?.stringList ?: emptyList()
+        get() = getProperty(
+            STYLE_KEY,
+            inherit = false,
+            includeStyles = false,
+            includeDefaults = true
+        )?.stringList ?: emptyList()
         set(value) {
-            config[STYLE_KEY] = value
+            setProperty(STYLE_KEY, value)
         }
 
     /**
@@ -78,24 +89,42 @@ public interface Vision : Configurable, Described {
     }
 }
 
+/**
+ * Convenient accessor for all properties of a vision. Provided properties include styles and defaults, but do not inherit.
+ */
+public val Vision.properties: MutableItemProvider
+    get() = object : MutableItemProvider {
+        override fun getItem(name: Name): MetaItem<*>? = getProperty(name,
+            inherit = false,
+            includeStyles = true,
+            includeDefaults = true
+        )
+
+        override fun setItem(name: Name, item: MetaItem<*>?): Unit = setProperty(name, item)
+    }
+
 /**
  * Get [Vision] property using key as a String
  */
-public fun Vision.getProperty(key: String, inherit: Boolean = true): MetaItem<*>? =
+public fun Vision.getProperty(
-    getProperty(key.toName(), inherit)
+    key: String,
+    inherit: Boolean = true,
+    includeStyles: Boolean = true,
+    includeDefaults: Boolean = true,
+): MetaItem<*>? = getProperty(key.toName(), inherit, includeStyles, includeDefaults)
 
 /**
  * A convenience method to pair [getProperty]
  */
 public fun Vision.setProperty(key: Name, value: Any?) {
-    config[key] = value
+    properties[key] = value
 }
 
 /**
  * A convenience method to pair [getProperty]
  */
 public fun Vision.setProperty(key: String, value: Any?) {
-    config[key] = value
+    properties[key] = value
 }
 
 /**
@@ -103,27 +132,7 @@ public fun Vision.setProperty(key: String, value: Any?) {
  */
 public var Vision.visible: Boolean?
     get() = getProperty(VISIBLE_KEY).boolean
-    set(value) = config.setValue(VISIBLE_KEY, value?.asValue())
+    set(value) = setProperty(VISIBLE_KEY, value?.asValue())
-
-///**
-// * Convenience delegate for properties
-// */
-//public fun Vision.property(
-//    default: MetaItem<*>? = null,
-//    key: Name? = null,
-//    inherit: Boolean = true,
-//): MutableItemDelegate =
-//    object : ReadWriteProperty<Any?, MetaItem<*>?> {
-//        override fun getValue(thisRef: Any?, property: KProperty<*>): MetaItem<*>? {
-//            val name = key ?: property.name.toName()
-//            return getProperty(name, inherit) ?: default
-//        }
-//
-//        override fun setValue(thisRef: Any?, property: KProperty<*>, value: MetaItem<*>?) {
-//            val name = key ?: property.name.toName()
-//            setProperty(name, value)
-//        }
-//    }
 
 public fun Vision.props(inherit: Boolean = true): MutableItemProvider = object : MutableItemProvider {
     override fun getItem(name: Name): MetaItem<*>? {

visionforge-core/src/commonMain/kotlin/hep/dataforge/vision/VisionBase.kt

@@ -3,15 +3,18 @@ package hep.dataforge.vision
 import hep.dataforge.meta.*
 import hep.dataforge.meta.descriptors.NodeDescriptor
 import hep.dataforge.meta.descriptors.defaultItem
-import hep.dataforge.meta.descriptors.defaultMeta
 import hep.dataforge.meta.descriptors.get
 import hep.dataforge.names.Name
 import hep.dataforge.names.asName
 import hep.dataforge.values.ValueType
 import hep.dataforge.vision.Vision.Companion.STYLE_KEY
+import kotlinx.coroutines.channels.BufferOverflow
+import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.SharedFlow
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 import kotlinx.serialization.Transient
+import kotlin.jvm.Synchronized
 
 internal data class PropertyListener(
     val owner: Any? = null,
@@ -28,83 +31,89 @@ public open class VisionBase : Vision {
     /**
      * Object own properties excluding styles and inheritance
      */
-    override var properties: Config? = null
+    @SerialName("properties")
-        protected set
+    private var _properties: Config? = null
 
-    override val descriptor: NodeDescriptor? get() = null
+    /**
+     * All own properties as a read-only Meta
+     */
+    public val ownProperties: Meta get() = _properties?: Meta.EMPTY
 
-    protected fun updateStyles(names: List<String>) {
+    @Synchronized
-        names.mapNotNull { getStyle(it) }.asSequence()
+    private fun getOrCreateConfig(): Config {
-            .flatMap { it.items.asSequence() }
+        if (_properties == null) {
-            .distinctBy { it.key }
+            val newProperties = Config()
-            .forEach {
+            _properties = newProperties
-                propertyChanged(it.key.asName())
+            newProperties.onChange(this) { name, oldItem, newItem ->
+                if (oldItem != newItem) {
+                    notifyPropertyChanged(name)
                 }
             }
+        }
+        return _properties!!
+    }
 
     /**
-     * The config is initialized and assigned on-demand.
+     * A fast accessor method to get own property (no inheritance or styles
-     * To avoid unnecessary allocations, one should access [getAllProperties] via [getProperty] instead.
      */
-    override val config: Config by lazy {
+    override fun getOwnProperty(name: Name): MetaItem<*>? {
-        properties ?: Config().also { config ->
+        return _properties?.getItem(name)
-            properties = config.also {
-                it.onChange(this) { name, _, _ -> propertyChanged(name) }
-            }
-        }
     }
 
-    @Transient
+    override fun getProperty(
-    private val listeners = HashSet<PropertyListener>()
+        name: Name,
-
+        inherit: Boolean,
-    override fun propertyChanged(name: Name) {
+        includeStyles: Boolean,
-        if (name == STYLE_KEY) {
+        includeDefaults: Boolean,
-            updateStyles(properties?.get(STYLE_KEY)?.stringList ?: emptyList())
+    ): MetaItem<*>? = sequence {
-        }
+        yield(getOwnProperty(name))
-        for (listener in listeners) {
+        if (includeStyles) {
-            listener.action(name)
-        }
-    }
-
-    override fun onPropertyChange(owner: Any?, action: (Name) -> Unit) {
-        listeners.add(PropertyListener(owner, action))
-    }
-
-    override fun removeChangeListener(owner: Any?) {
-        listeners.removeAll { owner == null || it.owner == owner }
-    }
-
-    /**
-     * All available properties in a layered form
-     */
-    override val allProperties: Laminate
-        get() = Laminate(
-            properties,
-            allStyles,
-            parent?.allProperties,
-            descriptor?.defaultMeta(),
-        )
-
-    override fun getProperty(name: Name, inherit: Boolean): MetaItem<*>? = sequence {
-        yield(properties?.get(name))
             yieldAll(getStyleItems(name))
+        }
         if (inherit) {
             yield(parent?.getProperty(name, inherit))
         }
         yield(descriptor?.get(name)?.defaultItem())
     }.merge()
 
-    /**
+    @Synchronized
-     * Reset all properties to their default values
+    override fun setProperty(name: Name, item: MetaItem<*>?) {
-     */
+        getOrCreateConfig().setItem(name, item)
-    public fun resetProperties() {
+        notifyPropertyChanged(name)
-        properties?.removeListener(this)
+    }
-        properties = null
+
+    override val descriptor: NodeDescriptor? get() = null
+
+    private fun updateStyles(names: List<String>) {
+        names.mapNotNull { getStyle(it) }.asSequence()
+            .flatMap { it.items.asSequence() }
+            .distinctBy { it.key }
+            .forEach {
+                notifyPropertyChanged(it.key.asName())
+            }
+    }
+
+    private val _propertyInvalidationFlow: MutableSharedFlow<Name> = MutableSharedFlow(
+        onBufferOverflow = BufferOverflow.DROP_OLDEST
+    )
+
+    override val propertyInvalidated: SharedFlow<Name> get() = _propertyInvalidationFlow
+
+    override fun notifyPropertyChanged(propertyName: Name) {
+        if (propertyName == STYLE_KEY) {
+            updateStyles(properties.getItem(STYLE_KEY)?.stringList ?: emptyList())
+        }
+
+        _propertyInvalidationFlow.tryEmit(propertyName)
+    }
+
+    public fun configure(block: MutableMeta<*>.() -> Unit) {
+        getOrCreateConfig().block()
     }
 
     override fun update(change: VisionChange) {
-        change.propertyChange[Name.EMPTY]?.let {
+        change.properties?.let {
-            config.update(it)
+            getOrCreateConfig().update(it)
         }
     }
 

visionforge-core/src/commonMain/kotlin/hep/dataforge/vision/VisionChange.kt

@@ -6,7 +6,10 @@ import hep.dataforge.names.plus
 import kotlinx.coroutines.*
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.flow
+import kotlinx.coroutines.flow.launchIn
+import kotlinx.coroutines.flow.onEach
 import kotlinx.serialization.*
+import kotlin.jvm.Synchronized
 import kotlin.time.Duration
 
 /**
@@ -14,29 +17,41 @@ import kotlin.time.Duration
  */
 public class VisionChangeBuilder : VisionContainerBuilder<Vision> {
 
-    private val propertyChange = HashMap<Name, Config>()
+    private var reset: Boolean = false
-    private val childrenChange = HashMap<Name, Vision?>()
+    private var vision: Vision? = null
+    private val propertyChange = Config()
+    private val children: HashMap<Name, VisionChangeBuilder> = HashMap()
 
-    public fun isEmpty(): Boolean = propertyChange.isEmpty() && childrenChange.isEmpty()
+    public fun isEmpty(): Boolean = propertyChange.isEmpty() && propertyChange.isEmpty() && children.isEmpty()
+
+    @Synchronized
+    private fun getOrPutChild(visionName: Name): VisionChangeBuilder =
+        children.getOrPut(visionName) { VisionChangeBuilder() }
 
     public fun propertyChanged(visionName: Name, propertyName: Name, item: MetaItem<*>?) {
-        propertyChange
+        if (visionName == Name.EMPTY) {
-            .getOrPut(visionName) { Config() }
+            propertyChange[propertyName] = item
-            .setItem(propertyName, item)
+        } else {
+            getOrPutChild(visionName).propertyChanged(Name.EMPTY, propertyName, item)
+        }
     }
 
     override fun set(name: Name, child: Vision?) {
-        childrenChange[name] = child
+        getOrPutChild(name).apply {
+            vision = child
+            reset = vision == null
+        }
     }
 
     /**
      * Isolate collected changes by creating detached copies of given visions
      */
     public fun isolate(manager: VisionManager): VisionChange = VisionChange(
-        propertyChange.mapValues { it.value.seal() },
+        reset,
-        childrenChange.mapValues { it.value?.isolate(manager) }
+        vision?.isolate(manager),
+        if (propertyChange.isEmpty()) null else propertyChange.seal(),
+        if (children.isEmpty()) null else children.mapValues { it.value.isolate(manager) }
     )
-    //TODO optimize isolation for visions without parents?
 }
 
 private fun Vision.isolate(manager: VisionManager): Vision {
@@ -46,16 +61,13 @@ private fun Vision.isolate(manager: VisionManager): Vision {
 }
 
 @Serializable
-public data class VisionChange(
+public class VisionChange(
-    val propertyChange: Map<Name, @Serializable(MetaSerializer::class) Meta>,
+    public val reset: Boolean = false,
-    val childrenChange: Map<Name, Vision?>,
+    public val vision: Vision? = null,
+    public val properties: Meta? = null,
+    public val children: Map<Name, VisionChange>? = null,
 ) {
-    public fun isEmpty(): Boolean = propertyChange.isEmpty() && childrenChange.isEmpty()
 
-    /**
-     * A shortcut to the top level property dif
-     */
-    public val properties: Meta? get() = propertyChange[Name.EMPTY]
 }
 
 public inline fun VisionChange(manager: VisionManager, block: VisionChangeBuilder.() -> Unit): VisionChange =
@@ -69,17 +81,10 @@ private fun CoroutineScope.collectChange(
 ) {
 
     //Collect properties change
-    source.config.onChange(this) { propertyName, oldItem, newItem ->
+    source.propertyInvalidated.onEach { propertyName ->
-        if (oldItem != newItem) {
+        val newItem = source.getProperty(propertyName, inherit = false, includeStyles = false, includeDefaults = false)
-            launch {
         collector().propertyChanged(name, propertyName, newItem)
-            }
+    }.launchIn(this)
-        }
-    }
-
-    coroutineContext[Job]?.invokeOnCompletion {
-        source.config.removeListener(this)
-    }
 
     if (source is VisionGroup) {
         //Subscribe for children changes
@@ -89,17 +94,12 @@ private fun CoroutineScope.collectChange(
 
         //Subscribe for structure change
         if (source is MutableVisionGroup) {
-            source.onStructureChange(this) { token, before, after ->
+            source.structureChanges.onEach { (token, _, after) ->
-                before?.removeChangeListener(this)
-                (before as? MutableVisionGroup)?.removeStructureChangeListener(this)
                 if (after != null) {
                     collectChange(name + token, after, collector)
                 }
                 collector()[name + token] = after
-            }
+            }.launchIn(this)
-            coroutineContext[Job]?.invokeOnCompletion {
-                source.removeStructureChangeListener(this)
-            }
         }
     }
 }
@@ -111,7 +111,8 @@ public fun Vision.flowChanges(
 ): Flow<VisionChange> = flow {
 
     var collector = VisionChangeBuilder()
-    manager.context.collectChange(Name.EMPTY, this@flowChanges) { collector }
+    coroutineScope {
+        collectChange(Name.EMPTY, this@flowChanges) { collector }
 
         while (currentCoroutineContext().isActive) {
             //Wait for changes to accumulate
@@ -124,4 +125,5 @@ public fun Vision.flowChanges(
                 collector = VisionChangeBuilder()
             }
         }
+    }
 }

visionforge-core/src/commonMain/kotlin/hep/dataforge/vision/VisionGroup.kt

@@ -2,6 +2,7 @@ package hep.dataforge.vision
 
 import hep.dataforge.names.*
 import hep.dataforge.provider.Provider
+import kotlinx.coroutines.flow.Flow
 
 public interface VisionContainer<out V : Vision> {
     public operator fun get(name: Name): V?
@@ -75,19 +76,12 @@ public interface VisionContainerBuilder<in V : Vision> {
  */
 public interface MutableVisionGroup : VisionGroup, VisionContainerBuilder<Vision> {
 
-    /**
+    public data class StructureChange(val token: NameToken, val before: Vision?, val after: Vision?)
-     * Add listener for children structure change.
-     * @param owner the handler to properly remove listeners
-     * @param action First argument of the action is the name of changed child. Second argument is the new value of the object.
-     */
-    public fun onStructureChange(owner: Any?, action: (token: NameToken, before: Vision?, after: Vision?) -> Unit)
 
     /**
-     * Remove children change listener
+     * Flow structure changes of this group. Unconsumed changes are discarded
      */
-    public fun removeStructureChangeListener(owner: Any?)
+    public val structureChanges: Flow<StructureChange>
-
-//    public operator fun set(name: Name, child: Vision?)
 }
 
 public operator fun <V : Vision> VisionContainer<V>.get(str: String): V? = get(str.toName())

visionforge-core/src/commonMain/kotlin/hep/dataforge/vision/VisionGroupBase.kt

@@ -1,7 +1,9 @@
 package hep.dataforge.vision
 
-import hep.dataforge.meta.configure
 import hep.dataforge.names.*
+import kotlinx.coroutines.channels.BufferOverflow
+import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.SharedFlow
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 import kotlinx.serialization.Transient
@@ -26,54 +28,25 @@ public open class VisionGroupBase : VisionBase(), MutableVisionGroup {
      */
     override val children: Map<NameToken, Vision> get() = childrenInternal
 
-    override fun propertyChanged(name: Name) {
+    override fun notifyPropertyChanged(propertyName: Name) {
-        super.propertyChanged(name)
+        super.notifyPropertyChanged(propertyName)
         for (obj in this) {
-            obj.propertyChanged(name)
+            obj.notifyPropertyChanged(propertyName)
         }
     }
 
-    private data class StructureChangeListener(
-        val owner: Any?,
-        val callback: (token: NameToken, before: Vision?, after: Vision?) -> Unit,
-    )
-
     @Transient
-    private val structureChangeListeners = HashSet<StructureChangeListener>()
+    private val _structureChanges: MutableSharedFlow<MutableVisionGroup.StructureChange> = MutableSharedFlow(
-
+        onBufferOverflow = BufferOverflow.DROP_OLDEST
-    /**
-     * Add listener for children change
-     */
-    override fun onStructureChange(owner: Any?, action: (token: NameToken, before: Vision?, after: Vision?) -> Unit) {
-        structureChangeListeners.add(
-            StructureChangeListener(
-                owner,
-                action
     )
-        )
-    }
 
-    /**
+    override val structureChanges: SharedFlow<MutableVisionGroup.StructureChange> get() = _structureChanges
-     * Remove children change listener
-     */
-    override fun removeStructureChangeListener(owner: Any?) {
-        structureChangeListeners.removeAll { owner == null || it.owner === owner }
-    }
 
     /**
      * Propagate children change event upwards
      */
-    protected fun childrenChanged(name: NameToken, before: Vision?, after: Vision?) {
+    private fun childrenChanged(name: NameToken, before: Vision?, after: Vision?) {
-        structureChangeListeners.forEach { it.callback(name, before, after) }
+        _structureChanges.tryEmit(MutableVisionGroup.StructureChange(name, before, after))
-    }
-
-    /**
-     * Remove a child with given name token
-     */
-    public fun removeChild(token: NameToken): Vision? {
-        val removed = childrenInternal.remove(token)
-        removed?.parent = null
-        return removed
     }
 
     /**
@@ -91,14 +64,24 @@ public open class VisionGroupBase : VisionBase(), MutableVisionGroup {
     /**
      * Set parent for given child and attach it
      */
-    private fun attachChild(token: NameToken, child: Vision) {
+    private fun attachChild(token: NameToken, child: Vision?) {
-        if (child.parent == null) {
+        val before = children[token]
+        when {
+            child == null -> {
+                childrenInternal.remove(token)
+            }
+            child.parent == null -> {
                 child.parent = this
                 childrenInternal[token] = child
-        } else if (child.parent !== this) {
+            }
+            child.parent !== this -> {
                 error("Can't reassign existing parent for $child")
             }
         }
+        if (before != child) {
+            childrenChanged(token, before, child)
+        }
+    }
 
     /**
      * Recursively create a child group
@@ -133,14 +116,8 @@ public open class VisionGroupBase : VisionBase(), MutableVisionGroup {
             }
             name.length == 1 -> {
                 val token = name.tokens.first()
-                val before = children[token]
-                if (child == null) {
-                    removeChild(token)
-                } else {
                 attachChild(token, child)
             }
-                childrenChanged(token, before, child)
-            }
             else -> {
                 //TODO add safety check
                 val parent = (get(name.cutLast()) as? MutableVisionGroup) ?: createGroups(name.cutLast())
@@ -150,18 +127,12 @@ public open class VisionGroupBase : VisionBase(), MutableVisionGroup {
     }
 
     override fun update(change: VisionChange) {
-        //update stylesheet
+        change.children?.forEach { (name, change) ->
-//            val changeStyleSheet = change.styleSheet
+            when {
-//            if (changeStyleSheet != null) {
+                change.reset -> set(name, null)
-//                styleSheet {
+                change.vision != null -> set(name, change.vision)
-//                    update(changeStyleSheet)
+                else -> get(name)?.update(change)
-//                }
-//            }
-        change.propertyChange.forEach {(childName,configChange)->
-            get(childName)?.configure(configChange)
             }
-        change.childrenChange.forEach { (name, child) ->
-            set(name, child)
         }
         super.update(change)
     }

visionforge-core/src/commonMain/kotlin/hep/dataforge/vision/misc.kt

@@ -1,9 +1,7 @@
 package hep.dataforge.vision
 
-import hep.dataforge.meta.Laminate
+import hep.dataforge.meta.*
-import hep.dataforge.meta.MetaItem
 import hep.dataforge.meta.descriptors.NodeDescriptor
-import hep.dataforge.meta.node
 import hep.dataforge.names.Name
 import hep.dataforge.values.ValueType
 import hep.dataforge.values.asValue
@@ -31,3 +29,19 @@ public inline fun <reified E : Enum<E>> NodeDescriptor.enum(key: Name, default:
     }
     allowedValues = enumValues<E>().map { it.asValue() }
 }
+
+@DFExperimental
+public val Vision.ownProperties: Meta?
+    get() = (this as? VisionBase)?.ownProperties
+
+@DFExperimental
+public val Vision.describedProperties: Meta
+    get() = Meta {
+        descriptor?.items?.forEach { (key, _) ->
+            key put getProperty(key)
+        }
+    }
+
+public fun Vision.configure(meta: Meta?): Unit = update(VisionChange(properties = meta))
+
+public fun Vision.configure(block: MutableMeta<*>.() -> Unit): Unit = configure(Meta(block))

visionforge-core/src/commonTest/kotlin/hep/dataforge/vision/html/HtmlTagTest.kt

@@ -1,7 +1,6 @@
 package hep.dataforge.vision.html
 
 import hep.dataforge.meta.DFExperimental
-import hep.dataforge.meta.configure
 import hep.dataforge.meta.set
 import hep.dataforge.vision.VisionBase
 import kotlinx.html.*
@@ -35,7 +34,7 @@ class HtmlTagTest {
         div {
             h2 { +"Properties" }
             ul {
-                vision.properties?.items?.forEach {
+                (vision as? VisionBase)?.ownProperties?.items?.forEach {
                     li {
                         a { +it.key.toString() }
                         p { +it.value.toString() }

visionforge-fx/src/main/kotlin/hep/dataforge/vision/editor/VisualObjectEditorFragment.kt

@@ -1,12 +1,8 @@
 package hep.dataforge.vision.editor
 
-import hep.dataforge.meta.Config
+import hep.dataforge.meta.*
-import hep.dataforge.meta.Meta
 import hep.dataforge.meta.descriptors.NodeDescriptor
-import hep.dataforge.meta.update
+import hep.dataforge.vision.*
-import hep.dataforge.vision.Vision
-import hep.dataforge.vision.getStyle
-import hep.dataforge.vision.setProperty
 import javafx.beans.binding.Binding
 import javafx.beans.property.SimpleObjectProperty
 import javafx.scene.Node
@@ -23,8 +19,8 @@ class VisualObjectEditorFragment(val selector: (Vision) -> Meta) : Fragment() {
     constructor(
         item: Vision?,
         descriptor: NodeDescriptor?,
-        selector: (Vision) -> Config = { it.config }
+        selector: (Vision) -> MutableItemProvider = { it.properties }
-    ) : this(selector) {
+    ) : this({it.describedProperties}) {
         this.item = item
         this.descriptorProperty.set(descriptor)
     }

visionforge-fx/src/main/kotlin/hep/dataforge/vision/solid/FX3DPlugin.kt

@@ -45,7 +45,7 @@ class FX3DPlugin : AbstractPlugin() {
     fun buildNode(obj: Solid): Node {
         val binding = VisualObjectFXBinding(obj)
         return when (obj) {
-            is SolidReference -> referenceFactory(obj, binding)
+            is SolidReferenceGroup -> referenceFactory(obj, binding)
             is SolidGroup -> {
                 Group(obj.children.mapNotNull { (token, obj) ->
                     (obj as? Solid)?.let {

visionforge-fx/src/main/kotlin/hep/dataforge/vision/solid/FXReferenceFactory.kt

@@ -6,15 +6,15 @@ import javafx.scene.Group
 import javafx.scene.Node
 import kotlin.reflect.KClass
 
-class FXReferenceFactory(val plugin: FX3DPlugin) : FX3DFactory<SolidReference> {
+class FXReferenceFactory(val plugin: FX3DPlugin) : FX3DFactory<SolidReferenceGroup> {
-    override val type: KClass<in SolidReference> get() = SolidReference::class
+    override val type: KClass<in SolidReferenceGroup> get() = SolidReferenceGroup::class
 
-    override fun invoke(obj: SolidReference, binding: VisualObjectFXBinding): Node {
+    override fun invoke(obj: SolidReferenceGroup, binding: VisualObjectFXBinding): Node {
         val prototype = obj.prototype
         val node = plugin.buildNode(prototype)
 
         obj.onPropertyChange(this) { name->
-            if (name.firstOrNull()?.body == SolidReference.REFERENCE_CHILD_PROPERTY_PREFIX) {
+            if (name.firstOrNull()?.body == SolidReferenceGroup.REFERENCE_CHILD_PROPERTY_PREFIX) {
                 val childName = name.firstOrNull()?.index?.toName() ?: error("Wrong syntax for reference child property: '$name'")
                 val propertyName = name.cutFirst()
                 val referenceChild = obj[childName] ?: error("Reference child with name '$childName' not found")

visionforge-gdml/src/commonMain/kotlin/hep/dataforge/vision/gdml/GDMLTransformer.kt

@@ -2,12 +2,12 @@ package hep.dataforge.vision.gdml
 
 import hep.dataforge.meta.Meta
 import hep.dataforge.meta.MetaBuilder
-import hep.dataforge.meta.set
 import hep.dataforge.names.Name
 import hep.dataforge.names.asName
 import hep.dataforge.names.plus
 import hep.dataforge.names.toName
 import hep.dataforge.vision.set
+import hep.dataforge.vision.setProperty
 import hep.dataforge.vision.solid.*
 import hep.dataforge.vision.solid.SolidMaterial.Companion.MATERIAL_COLOR_KEY
 import hep.dataforge.vision.styleSheet
@@ -51,13 +51,13 @@ private class GDMLTransformer(val settings: GDMLTransformerSettings) {
     private val proto = SolidGroup()
 
     private val solids = proto.group(solidsName) {
-        config["edges.enabled"] = false
+        setProperty("edges.enabled", false)
     }
 
 
-    private val referenceStore = HashMap<Name, MutableList<SolidReference>>()
+    private val referenceStore = HashMap<Name, MutableList<SolidReferenceGroup>>()
 
-    private fun proxySolid(root: GDML, group: SolidGroup, solid: GDMLSolid, name: String): SolidReference {
+    private fun proxySolid(root: GDML, group: SolidGroup, solid: GDMLSolid, name: String): SolidReferenceGroup {
         val templateName = solidsName + name
         if (proto[templateName] == null) {
             solids.addSolid(root, solid, name)
@@ -67,7 +67,7 @@ private class GDMLTransformer(val settings: GDMLTransformerSettings) {
         return ref
     }
 
-    private fun proxyVolume(root: GDML, group: SolidGroup, physVolume: GDMLPhysVolume, volume: GDMLGroup): SolidReference {
+    private fun proxyVolume(root: GDML, group: SolidGroup, physVolume: GDMLPhysVolume, volume: GDMLGroup): SolidReferenceGroup {
         val templateName = volumesName + volume.name.asName()
         if (proto[templateName] == null) {
             proto[templateName] = volume(root, volume)

visionforge-gdml/src/commonMain/kotlin/hep/dataforge/vision/gdml/GdmlOptimizer.kt

@@ -2,16 +2,10 @@ package hep.dataforge.vision.gdml
 
 import hep.dataforge.meta.DFExperimental
 import hep.dataforge.meta.sequence
-import hep.dataforge.meta.set
+import hep.dataforge.vision.Vision
-import hep.dataforge.names.Name
+import hep.dataforge.vision.ownProperties
-import hep.dataforge.names.toName
+import hep.dataforge.vision.properties
-import hep.dataforge.vision.*
 import hep.dataforge.vision.solid.*
-import hep.dataforge.vision.visitor.VisionVisitor
-import kotlinx.coroutines.CompletableDeferred
-import kotlinx.coroutines.Job
-import kotlinx.coroutines.coroutineScope
-import mu.KotlinLogging
 
 public expect class Counter() {
     public fun get(): Int
@@ -24,6 +18,7 @@ private fun Point3D?.safePlus(other: Point3D?): Point3D? = if (this == null && o
     (this ?: Point3D(0, 0, 0)) + (other ?: Point3D(0, 0, 0))
 }
 
+@DFExperimental
 internal fun Vision.updateFrom(other: Vision): Vision {
     if (this is Solid && other is Solid) {
         position = position.safePlus(other.position)
@@ -33,9 +28,9 @@ internal fun Vision.updateFrom(other: Vision): Vision {
             scaleY = scaleY.toDouble() * other.scaleY.toDouble()
             scaleZ = scaleZ.toDouble() * other.scaleZ.toDouble()
         }
-        other.properties?.sequence()?.forEach { (name, item) ->
+        other.ownProperties?.sequence()?.forEach { (name, item) ->
-            if (properties?.getItem(name) == null) {
+            if (properties.getItem(name) == null) {
-                config[name] = item
+                setProperty(name, item)
             }
         }
     }

visionforge-solid/src/commonMain/kotlin/hep/dataforge/vision/solid/Composite.kt

@@ -1,4 +1,3 @@
-
 package hep.dataforge.vision.solid
 
 import hep.dataforge.meta.update
@@ -18,7 +17,7 @@ public enum class CompositeType {
 public class Composite(
     public val compositeType: CompositeType,
     public val first: Solid,
-    public val second: Solid
+    public val second: Solid,
 ) : SolidBase(), Solid, VisionGroup {
 
     init {
@@ -34,15 +33,13 @@ public class Composite(
 public inline fun VisionContainerBuilder<Solid>.composite(
     type: CompositeType,
     name: String = "",
-    builder: SolidGroup.() -> Unit
+    builder: SolidGroup.() -> Unit,
 ): Composite {
     val group = SolidGroup().apply(builder)
     val children = group.children.values.filterIsInstance<Solid>()
     if (children.size != 2) error("Composite requires exactly two children")
     return Composite(type, children[0], children[1]).also {
-        it.config.update(group.config)
+        it.configure { update(group.ownProperties) }
-        //it.material = group.material
-
         if (group.position != null) {
             it.position = group.position
         }
@@ -65,5 +62,8 @@ public inline fun VisionContainerBuilder<Solid>.subtract(name: String = "", buil
     composite(CompositeType.SUBTRACT, name, builder = builder)
 
 @VisionBuilder
-public inline fun VisionContainerBuilder<Solid>.intersect(name: String = "", builder: SolidGroup.() -> Unit): Composite =
+public inline fun VisionContainerBuilder<Solid>.intersect(
+    name: String = "",
+    builder: SolidGroup.() -> Unit,
+): Composite =
     composite(CompositeType.INTERSECT, name, builder = builder)

visionforge-solid/src/commonMain/kotlin/hep/dataforge/vision/solid/Solid.kt

@@ -1,18 +1,17 @@
 package hep.dataforge.vision.solid
 
-import hep.dataforge.meta.*
+import hep.dataforge.meta.boolean
 import hep.dataforge.meta.descriptors.NodeDescriptor
+import hep.dataforge.meta.enum
+import hep.dataforge.meta.int
 import hep.dataforge.names.Name
 import hep.dataforge.names.asName
 import hep.dataforge.names.plus
 import hep.dataforge.values.ValueType
 import hep.dataforge.values.asValue
-import hep.dataforge.vision.Vision
+import hep.dataforge.vision.*
 import hep.dataforge.vision.Vision.Companion.VISIBLE_KEY
-import hep.dataforge.vision.VisionBuilder
-import hep.dataforge.vision.enum
 import hep.dataforge.vision.layout.Output
-import hep.dataforge.vision.setProperty
 import hep.dataforge.vision.solid.Solid.Companion.DETAIL_KEY
 import hep.dataforge.vision.solid.Solid.Companion.IGNORE_KEY
 import hep.dataforge.vision.solid.Solid.Companion.LAYER_KEY
@@ -90,7 +89,7 @@ public interface Solid : Vision {
             var result = +(solid.position?.hashCode() ?: 0)
             result = 31 * result + (solid.rotation?.hashCode() ?: 0)
             result = 31 * result + (solid.scale?.hashCode() ?: 0)
-            result = 31 * result + (solid.properties?.hashCode() ?: 0)
+            result = 31 * result + solid.properties.hashCode()
             return result
         }
     }
@@ -100,9 +99,9 @@ public interface Solid : Vision {
  * Get the layer number this solid belongs to. Return 0 if layer is not defined.
  */
 public var Solid.layer: Int
-    get() = properties?.getItem(LAYER_KEY).int ?: 0
+    get() = properties.getItem(LAYER_KEY).int ?: 0
     set(value) {
-        config[LAYER_KEY] = value.asValue()
+        setProperty(LAYER_KEY, value)
     }
 
 @VisionBuilder
@@ -153,21 +152,21 @@ public var Solid.x: Number
     get() = position?.x ?: 0f
     set(value) {
         position().x = value.toDouble()
-        propertyChanged(Solid.X_POSITION_KEY)
+        notifyPropertyChanged(Solid.X_POSITION_KEY)
     }
 
 public var Solid.y: Number
     get() = position?.y ?: 0f
     set(value) {
         position().y = value.toDouble()
-        propertyChanged(Solid.Y_POSITION_KEY)
+        notifyPropertyChanged(Solid.Y_POSITION_KEY)
     }
 
 public var Solid.z: Number
     get() = position?.z ?: 0f
     set(value) {
         position().z = value.toDouble()
-        propertyChanged(Solid.Z_POSITION_KEY)
+        notifyPropertyChanged(Solid.Z_POSITION_KEY)
     }
 
 private fun Solid.rotation(): Point3D =
@@ -177,21 +176,21 @@ public var Solid.rotationX: Number
     get() = rotation?.x ?: 0f
     set(value) {
         rotation().x = value.toDouble()
-        propertyChanged(Solid.X_ROTATION_KEY)
+        notifyPropertyChanged(Solid.X_ROTATION_KEY)
     }
 
 public var Solid.rotationY: Number
     get() = rotation?.y ?: 0f
     set(value) {
         rotation().y = value.toDouble()
-        propertyChanged(Solid.Y_ROTATION_KEY)
+        notifyPropertyChanged(Solid.Y_ROTATION_KEY)
     }
 
 public var Solid.rotationZ: Number
     get() = rotation?.z ?: 0f
     set(value) {
         rotation().z = value.toDouble()
-        propertyChanged(Solid.Z_ROTATION_KEY)
+        notifyPropertyChanged(Solid.Z_ROTATION_KEY)
     }
 
 private fun Solid.scale(): Point3D =
@@ -201,19 +200,19 @@ public var Solid.scaleX: Number
     get() = scale?.x ?: 1f
     set(value) {
         scale().x = value.toDouble()
-        propertyChanged(Solid.X_SCALE_KEY)
+        notifyPropertyChanged(Solid.X_SCALE_KEY)
     }
 
 public var Solid.scaleY: Number
     get() = scale?.y ?: 1f
     set(value) {
         scale().y = value.toDouble()
-        propertyChanged(Solid.Y_SCALE_KEY)
+        notifyPropertyChanged(Solid.Y_SCALE_KEY)
     }
 
 public var Solid.scaleZ: Number
     get() = scale?.z ?: 1f
     set(value) {
         scale().z = value.toDouble()
-        propertyChanged(Solid.Z_SCALE_KEY)
+        notifyPropertyChanged(Solid.Z_SCALE_KEY)
     }

visionforge-solid/src/commonMain/kotlin/hep/dataforge/vision/solid/SolidGroup.kt

@@ -1,6 +1,6 @@
 package hep.dataforge.vision.solid
 
-import hep.dataforge.meta.Config
+import hep.dataforge.meta.MetaItem
 import hep.dataforge.meta.descriptors.NodeDescriptor
 import hep.dataforge.names.Name
 import hep.dataforge.names.NameToken
@@ -87,7 +87,10 @@ public tailrec fun PrototypeHolder.getPrototype(name: Name): Solid? =
     prototypes?.get(name) as? Solid ?: (parent as? PrototypeHolder)?.getPrototype(name)
 
 @VisionBuilder
-public fun VisionContainerBuilder<Vision>.group(name: Name = Name.EMPTY, action: SolidGroup.() -> Unit = {}): SolidGroup =
+public fun VisionContainerBuilder<Vision>.group(
+    name: Name = Name.EMPTY,
+    action: SolidGroup.() -> Unit = {},
+): SolidGroup =
     SolidGroup().apply(action).also { set(name, it) }
 
 /**
@@ -104,15 +107,10 @@ internal class Prototypes(
     children: Map<NameToken, Vision> = emptyMap(),
 ) : VisionGroupBase(), PrototypeHolder {
 
-    init {
+    override var parent: VisionGroup? = null
-        this.childrenInternal.putAll(children)
-    }
 
-    override var properties: Config?
+    private val _children = HashMap(children)
-        get() = null
+    override val children: Map<NameToken, Vision> get() = _children
-        set(_) {
-            error("Can't define properties for prototypes block")
-        }
 
     override val prototypes: MutableVisionGroup get() = this
 
@@ -123,6 +121,21 @@ internal class Prototypes(
         }
     }
 
+    override fun getOwnProperty(name: Name): MetaItem<*>? = null
+
+    override fun getProperty(
+        name: Name,
+        inherit: Boolean,
+        includeStyles: Boolean,
+        includeDefaults: Boolean,
+    ): MetaItem<*>? = null
+
+    override fun setProperty(name: Name, item: MetaItem<*>?) {
+        TODO("Not yet implemented")
+    }
+
+    override val descriptor: NodeDescriptor? = null
+
     companion object : KSerializer<MutableVisionGroup> {
 
         private val mapSerializer: KSerializer<Map<NameToken, Vision>> =

visionforge-solid/src/commonMain/kotlin/hep/dataforge/vision/solid/SolidManager.kt

@@ -36,7 +36,7 @@ public class SolidManager(meta: Meta) : AbstractPlugin(meta) {
 
         private fun PolymorphicModuleBuilder<Solid>.solids() {
             subclass(SolidGroup.serializer())
-            subclass(SolidReference.serializer())
+            subclass(SolidReferenceGroup.serializer())
             subclass(Composite.serializer())
             subclass(Tube.serializer())
             subclass(Box.serializer())

visionforge-solid/src/commonMain/kotlin/hep/dataforge/vision/solid/SolidMaterial.kt

@@ -10,13 +10,10 @@ import hep.dataforge.values.Value
 import hep.dataforge.values.ValueType
 import hep.dataforge.values.asValue
 import hep.dataforge.values.string
-import hep.dataforge.vision.Colors
+import hep.dataforge.vision.*
-import hep.dataforge.vision.VisionBuilder
-import hep.dataforge.vision.setProperty
 import hep.dataforge.vision.solid.SolidMaterial.Companion.MATERIAL_COLOR_KEY
 import hep.dataforge.vision.solid.SolidMaterial.Companion.MATERIAL_KEY
 import hep.dataforge.vision.solid.SolidMaterial.Companion.MATERIAL_OPACITY_KEY
-import hep.dataforge.vision.widgetType
 
 @VisionBuilder
 public class ColorAccessor(private val parent: MutableItemProvider, private val colorKey: Name) {
@@ -115,7 +112,7 @@ public class SolidMaterial : Scheme() {
     }
 }
 
-public val Solid.color: ColorAccessor get() = ColorAccessor(config, MATERIAL_COLOR_KEY)
+public val Solid.color: ColorAccessor get() = ColorAccessor(properties, MATERIAL_COLOR_KEY)
 
 public var Solid.material: SolidMaterial?
     get() = getProperty(MATERIAL_KEY).node?.let { SolidMaterial.read(it) }
@@ -123,11 +120,11 @@ public var Solid.material: SolidMaterial?
 
 @VisionBuilder
 public fun Solid.material(builder: SolidMaterial.() -> Unit) {
-    val node = config[MATERIAL_KEY].node
+    val node = properties.getItem(MATERIAL_KEY).node
     if (node != null) {
         SolidMaterial.update(node, builder)
     } else {
-        config[MATERIAL_KEY] = SolidMaterial(builder)
+        setProperty(MATERIAL_KEY, SolidMaterial(builder))
     }
 }
 

visionforge-solid/src/commonMain/kotlin/hep/dataforge/vision/solid/SolidReference.kt

@@ -1,156 +0,0 @@
-package hep.dataforge.vision.solid
-
-import hep.dataforge.meta.*
-import hep.dataforge.meta.descriptors.NodeDescriptor
-import hep.dataforge.names.*
-import hep.dataforge.vision.*
-import kotlinx.serialization.SerialName
-import kotlinx.serialization.Serializable
-import kotlinx.serialization.Transient
-import kotlin.collections.set
-
-public abstract class AbstractReference : SolidBase(), VisionGroup {
-    public abstract val prototype: Solid
-
-    override fun getProperty(name: Name, inherit: Boolean): MetaItem<*>? = sequence {
-        yield(properties?.get(name))
-        yieldAll(getStyleItems(name))
-        yield(prototype.getProperty(name))
-        if (inherit) {
-            yield(parent?.getProperty(name, inherit))
-        }
-    }.merge()
-
-    override var styles: List<String>
-        get() = (properties[Vision.STYLE_KEY]?.stringList ?: emptyList()) + prototype.styles
-        set(value) {
-            config[Vision.STYLE_KEY] = value
-        }
-
-    override val allProperties: Laminate
-        get() = Laminate(
-            properties,
-            allStyles,
-            prototype.allProperties,
-            parent?.allProperties,
-        )
-
-    override fun attachChildren() {
-        //do nothing
-    }
-
-    override val descriptor: NodeDescriptor get() = prototype.descriptor
-}
-
-/**
- * A reference [Solid] to reuse a template object
- */
-@Serializable
-@SerialName("solid.ref")
-public class SolidReference(
-    public val templateName: Name,
-) : AbstractReference(), Solid {
-
-    /**
-     * Recursively search for defined template in the parent
-     */
-    override val prototype: Solid
-        get() = (parent as? SolidGroup)?.getPrototype(templateName)
-            ?: error("Prototype with name $templateName not found in $parent")
-
-    @Transient
-    private val propertyCache: HashMap<Name, Config> = HashMap()
-
-
-    override val children: Map<NameToken, SolidReference.ReferenceChild>
-        get() = (prototype as? VisionGroup)?.children
-            ?.filter { !it.key.toString().startsWith("@") }
-            ?.mapValues {
-                ReferenceChild(it.key.asName())
-            } ?: emptyMap()
-
-    private fun childPropertyName(childName: Name, propertyName: Name): Name {
-        return NameToken(REFERENCE_CHILD_PROPERTY_PREFIX, childName.toString()) + propertyName
-    }
-
-    private fun prototypeFor(name: Name): Solid {
-        return (prototype as? SolidGroup)?.get(name) as? Solid
-            ?: error("Prototype with name $name not found in $this")
-    }
-
-    //override fun findAllStyles(): Laminate = Laminate((styles + prototype.styles).mapNotNull { findStyle(it) })
-
-    /**
-     * A ProxyChild is created temporarily only to interact with properties, it does not store any values
-     * (properties are stored in external cache) and created and destroyed on-demand).
-     */
-    public inner class ReferenceChild(public val name: Name) : AbstractReference() {
-
-        override val prototype: Solid get() = prototypeFor(name)
-
-        override val children: Map<NameToken, Vision>
-            get() = (prototype as? VisionGroup)?.children
-                ?.filter { !it.key.toString().startsWith("@") }
-                ?.mapValues { (key, _) ->
-                    ReferenceChild(name + key.asName())
-                } ?: emptyMap()
-
-        override var properties: Config?
-            get() = propertyCache[name]
-            set(value) {
-                if (value == null) {
-                    propertyCache.remove(name)?.also {
-                        //Removing listener if it is present
-                        removeChangeListener(this@SolidReference)
-                    }
-                } else {
-                    propertyCache[name] = value.also {
-                        onPropertyChange(this@SolidReference) { propertyName ->
-                            this@SolidReference.propertyChanged(childPropertyName(name, propertyName))
-                        }
-                    }
-                }
-            }
-
-    }
-
-    public companion object {
-        public const val REFERENCE_CHILD_PROPERTY_PREFIX: String = "@child"
-    }
-}
-
-/**
- * Get a vision prototype if it is a [SolidReference] or vision itself if it is not
- */
-public val Vision.prototype: Vision
-    get() = when (this) {
-        is AbstractReference -> prototype
-        else -> this
-    }
-
-/**
- * Create ref for existing prototype
- */
-public fun SolidGroup.ref(
-    templateName: Name,
-    name: String = "",
-): SolidReference = SolidReference(templateName).also { set(name, it) }
-
-/**
- * Add new [SolidReference] wrapping given object and automatically adding it to the prototypes
- */
-public fun SolidGroup.ref(
-    name: String,
-    obj: Solid,
-    templateName: Name = name.toName(),
-): SolidReference {
-    val existing = getPrototype(templateName)
-    if (existing == null) {
-        prototypes {
-            this[templateName] = obj
-        }
-    } else if (existing != obj) {
-        error("Can't add different prototype on top of existing one")
-    }
-    return this@ref.ref(templateName, name)
-}

visionforge-solid/src/commonMain/kotlin/hep/dataforge/vision/solid/SolidReferenceGroup.kt

@@ -0,0 +1,189 @@
+package hep.dataforge.vision.solid
+
+import hep.dataforge.meta.*
+import hep.dataforge.meta.descriptors.NodeDescriptor
+import hep.dataforge.names.*
+import hep.dataforge.vision.*
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.filter
+import kotlinx.coroutines.flow.map
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+
+public interface SolidReference : Vision {
+    public val prototype: Solid
+}
+
+/**
+ * A reference [Solid] to reuse a template object
+ */
+@Serializable
+@SerialName("solid.ref")
+public class SolidReferenceGroup(
+    public val templateName: Name,
+) : SolidBase(), SolidReference, VisionGroup {
+
+    /**
+     * Recursively search for defined template in the parent
+     */
+    override val prototype: Solid
+        get() = (parent as? SolidGroup)?.getPrototype(templateName)
+            ?: error("Prototype with name $templateName not found in $parent")
+
+    override val children: Map<NameToken, Vision>
+        get() = (prototype as? VisionGroup)?.children
+            ?.filter { !it.key.toString().startsWith("@") }
+            ?.mapValues {
+                ReferenceChild(it.key.asName())
+            } ?: emptyMap()
+
+    private fun childToken(childName: Name): NameToken =
+        NameToken(REFERENCE_CHILD_PROPERTY_PREFIX, childName.toString())
+
+    private fun childPropertyName(childName: Name, propertyName: Name): Name =
+        childToken(childName) + propertyName
+
+    private fun getChildProperty(childName: Name, propertyName: Name): MetaItem<*>? {
+        return getOwnProperty(childPropertyName(childName, propertyName))
+    }
+
+    private fun setChildProperty(childName: Name, propertyName: Name, item: MetaItem<*>?) {
+        setProperty(childPropertyName(childName, propertyName), item)
+    }
+
+    private fun prototypeFor(name: Name): Solid {
+        return if(name.isEmpty()) prototype else {
+            (prototype as? SolidGroup)?.get(name) as? Solid
+                ?: error("Prototype with name $name not found in $this")
+        }
+    }
+
+    override fun getProperty(
+        name: Name,
+        inherit: Boolean,
+        includeStyles: Boolean,
+        includeDefaults: Boolean,
+    ): MetaItem<*>? = sequence {
+        yield(getOwnProperty(name))
+        if (includeStyles) {
+            yieldAll(getStyleItems(name))
+        }
+        yield(prototype.getProperty(name, inherit, includeStyles, includeDefaults))
+        if (inherit) {
+            yield(parent?.getProperty(name, inherit))
+        }
+    }.merge()
+
+    override fun attachChildren() {
+        //do nothing
+    }
+
+    override val descriptor: NodeDescriptor get() = prototype.descriptor
+
+
+    /**
+     * A ProxyChild is created temporarily only to interact with properties, it does not store any values
+     * (properties are stored in external cache) and created and destroyed on-demand).
+     */
+    private inner class ReferenceChild(private val childName: Name) : SolidReference, VisionGroup {
+
+        override val prototype: Solid get() = prototypeFor(childName)
+
+        override val children: Map<NameToken, Vision>
+            get() = (prototype as? VisionGroup)?.children
+                ?.filter { !it.key.toString().startsWith("@") }
+                ?.mapValues { (key, _) ->
+                    ReferenceChild(childName + key.asName())
+                } ?: emptyMap()
+
+        override fun getOwnProperty(name: Name): MetaItem<*>? = getChildProperty(childName, name)
+
+        override fun setProperty(name: Name, item: MetaItem<*>?) {
+            setChildProperty(childName, name, item)
+        }
+
+        override fun getProperty(
+            name: Name,
+            inherit: Boolean,
+            includeStyles: Boolean,
+            includeDefaults: Boolean,
+        ): MetaItem<*>? = sequence {
+            yield(getOwnProperty(name))
+            if (includeStyles) {
+                yieldAll(getStyleItems(name))
+            }
+            yield(prototype.getProperty(name, inherit, includeStyles, includeDefaults))
+            if (inherit) {
+                yield(parent?.getProperty(name, inherit))
+            }
+        }.merge()
+
+        override var parent: VisionGroup?
+            get(){
+                val parentName = childName.cutLast()
+                return if( parentName.isEmpty()) this@SolidReferenceGroup else ReferenceChild(parentName)
+            }
+            set(value) {
+                error("Setting a parent for a reference child is not possible")
+            }
+
+        override val propertyInvalidated: Flow<Name>
+            get() = this@SolidReferenceGroup.propertyInvalidated.filter { name ->
+                name.startsWith(childToken(childName))
+            }.map { name ->
+                name.cutFirst()
+            }
+
+        override fun notifyPropertyChanged(propertyName: Name) {
+            this@SolidReferenceGroup.notifyPropertyChanged(childPropertyName(childName, propertyName))
+        }
+
+        override fun update(change: VisionChange) {
+            TODO("Not yet implemented")
+        }
+
+        override fun attachChildren() {
+            //do nothing
+        }
+
+        override val descriptor: NodeDescriptor get() = prototype.descriptor
+
+    }
+
+    public companion object {
+        public const val REFERENCE_CHILD_PROPERTY_PREFIX: String = "@child"
+    }
+}
+
+/**
+ * Get a vision prototype if it is a [SolidReferenceGroup] or vision itself if it is not
+ */
+public val Vision.prototype: Vision
+    get() = if (this is SolidReference) prototype else this
+
+/**
+ * Create ref for existing prototype
+ */
+public fun SolidGroup.ref(
+    templateName: Name,
+    name: String = "",
+): SolidReferenceGroup = SolidReferenceGroup(templateName).also { set(name, it) }
+
+/**
+ * Add new [SolidReferenceGroup] wrapping given object and automatically adding it to the prototypes
+ */
+public fun SolidGroup.ref(
+    name: String,
+    obj: Solid,
+    templateName: Name = name.toName(),
+): SolidReferenceGroup {
+    val existing = getPrototype(templateName)
+    if (existing == null) {
+        prototypes {
+            this[templateName] = obj
+        }
+    } else if (existing != obj) {
+        error("Can't add different prototype on top of existing one")
+    }
+    return this@ref.ref(templateName, name)
+}

visionforge-solid/src/commonMain/kotlin/hep/dataforge/vision/solid/transform/RemoveSingleChild.kt

@@ -1,18 +1,15 @@
 package hep.dataforge.vision.solid.transform
 
 import hep.dataforge.meta.DFExperimental
-import hep.dataforge.meta.update
 import hep.dataforge.names.asName
-import hep.dataforge.vision.MutableVisionGroup
+import hep.dataforge.vision.*
-import hep.dataforge.vision.Vision
-import hep.dataforge.vision.VisionGroup
 import hep.dataforge.vision.solid.*
 
 @DFExperimental
 internal fun mergeChild(parent: VisionGroup, child: Vision): Vision {
     return child.apply {
 
-        config.update(parent.config)
+        configure(parent.ownProperties)
 
         //parent.properties?.let { config.update(it) }
 
@@ -40,7 +37,7 @@ internal object RemoveSingleChild : VisualTreeTransform<SolidGroup>() {
     override fun SolidGroup.transformInPlace() {
         fun MutableVisionGroup.replaceChildren() {
             children.forEach { (childName, parent) ->
-                if (parent is SolidReference) return@forEach //ignore refs
+                if (parent is SolidReferenceGroup) return@forEach //ignore refs
                 if (parent is MutableVisionGroup) {
                     parent.replaceChildren()
                 }

visionforge-solid/src/commonMain/kotlin/hep/dataforge/vision/solid/transform/UnRef.kt

@@ -6,7 +6,7 @@ import hep.dataforge.names.asName
 import hep.dataforge.vision.MutableVisionGroup
 import hep.dataforge.vision.VisionGroup
 import hep.dataforge.vision.solid.SolidGroup
-import hep.dataforge.vision.solid.SolidReference
+import hep.dataforge.vision.solid.SolidReferenceGroup
 
 @DFExperimental
 internal object UnRef : VisualTreeTransform<SolidGroup>() {
@@ -17,7 +17,7 @@ internal object UnRef : VisualTreeTransform<SolidGroup>() {
                 counter.forEach { (key, value) ->
                     reducer[key] = (reducer[key] ?: 0) + value
                 }
-            } else if (obj is SolidReference) {
+            } else if (obj is SolidReferenceGroup) {
                 reducer[obj.templateName] = (reducer[obj.templateName] ?: 0) + 1
             }
 
@@ -27,8 +27,8 @@ internal object UnRef : VisualTreeTransform<SolidGroup>() {
 
     private fun MutableVisionGroup.unref(name: Name) {
         (this as? SolidGroup)?.prototypes?.set(name, null)
-        children.filter { (it.value as? SolidReference)?.templateName == name }.forEach { (key, value) ->
+        children.filter { (it.value as? SolidReferenceGroup)?.templateName == name }.forEach { (key, value) ->
-            val reference = value as SolidReference
+            val reference = value as SolidReferenceGroup
             val newChild = mergeChild(reference, reference.prototype)
             newChild.parent = null
             set(key.asName(), newChild) // replace proxy with merged object

visionforge-solid/src/commonTest/kotlin/hep/dataforge/vision/solid/PropertyTest.kt

@@ -1,8 +1,8 @@
 package hep.dataforge.vision.solid
 
 import hep.dataforge.meta.int
-import hep.dataforge.meta.set
 import hep.dataforge.names.asName
+import hep.dataforge.vision.setProperty
 import hep.dataforge.vision.styleSheet
 import hep.dataforge.vision.useStyle
 import kotlin.test.Test
@@ -14,7 +14,7 @@ class PropertyTest {
     fun testInheritedProperty() {
         var box: Box? = null
         val group = SolidGroup().apply {
-            config["test"] = 22
+            setProperty("test", 22)
             group {
                 box = box(100, 100, 100)
             }
@@ -60,7 +60,7 @@ class PropertyTest {
 
     @Test
     fun testReferenceStyleProperty() {
-        var box: SolidReference? = null
+        var box: SolidReferenceGroup? = null
         val group = SolidGroup{
             styleSheet {
                 set("testStyle") {

visionforge-solid/src/commonTest/kotlin/hep/dataforge/vision/solid/SerializationTest.kt

@@ -4,6 +4,7 @@ import hep.dataforge.names.Name
 import hep.dataforge.names.toName
 import hep.dataforge.vision.MutableVisionGroup
 import hep.dataforge.vision.get
+import hep.dataforge.vision.ownProperties
 import kotlin.test.Test
 import kotlin.test.assertEquals
 
@@ -15,7 +16,7 @@ fun SolidGroup.refGroup(
     name: String,
     templateName: Name = name.toName(),
     block: MutableVisionGroup.() -> Unit
-): SolidReference {
+): SolidReferenceGroup {
     val group = SolidGroup().apply(block)
     return ref(name, group, templateName)
 }
@@ -32,7 +33,7 @@ class SerializationTest {
         val string =  SolidManager.encodeToString(cube)
         println(string)
         val newCube = SolidManager.decodeFromString(string)
-        assertEquals(cube.config, newCube.config)
+        assertEquals(cube.ownProperties, newCube.ownProperties)
     }
 
     @Test
@@ -53,7 +54,7 @@ class SerializationTest {
         val string = SolidManager.encodeToString(group)
         println(string)
         val reconstructed = SolidManager.decodeFromString(string) as SolidGroup
-        assertEquals(group["cube"]?.config, reconstructed["cube"]?.config)
+        assertEquals(group["cube"]?.ownProperties, reconstructed["cube"]?.ownProperties)
     }
 
 }

visionforge-solid/src/commonTest/kotlin/hep/dataforge/vision/solid/VisionUpdateTest.kt

@@ -45,7 +45,7 @@ class VisionUpdateTest {
         val serialized = visionManager.jsonFormat.encodeToString(VisionChange.serializer(), change)
         println(serialized)
         val reconstructed = visionManager.jsonFormat.decodeFromString(VisionChange.serializer(), serialized)
-        assertEquals(change.propertyChange,reconstructed.propertyChange)
+        assertEquals(change.properties,reconstructed.properties)
     }
 
     @Test

visionforge-threejs/src/main/kotlin/hep/dataforge/vision/solid/three/MeshThreeFactory.kt

@@ -15,20 +15,22 @@ import info.laht.threekt.geometries.EdgesGeometry
 import info.laht.threekt.geometries.WireframeGeometry
 import info.laht.threekt.objects.LineSegments
 import info.laht.threekt.objects.Mesh
+import kotlinx.coroutines.flow.launchIn
+import kotlinx.coroutines.flow.onEach
 import kotlin.reflect.KClass
 
 /**
  * Basic geometry-based factory
  */
 public abstract class MeshThreeFactory<in T : Solid>(
-    override val type: KClass<in T>
+    override val type: KClass<in T>,
 ) : ThreeFactory<T> {
     /**
      * Build a geometry for an object
      */
     public abstract fun buildGeometry(obj: T): BufferGeometry
 
-    override fun invoke(obj: T): Mesh {
+    override fun invoke(three: ThreePlugin, obj: T): Mesh {
         val geometry = buildGeometry(obj)
 
         //JS sometimes tries to pass Geometry as BufferGeometry
@@ -36,14 +38,14 @@ public abstract class MeshThreeFactory<in T : Solid>(
 
         //val meshMeta: Meta = obj.properties[Material3D.MATERIAL_KEY]?.node ?: Meta.empty
 
-        val mesh = Mesh(geometry, null).apply{
+        val mesh = Mesh(geometry, null).apply {
             matrixAutoUpdate = false
             //set position for mesh
             updatePosition(obj)
         }.applyProperties(obj)
 
         //add listener to object properties
-        obj.onPropertyChange(this) { name ->
+        obj.propertyInvalidated.onEach { name ->
             when {
                 name.startsWith(Solid.GEOMETRY_KEY) -> {
                     val oldGeometry = mesh.geometry as BufferGeometry
@@ -57,7 +59,8 @@ public abstract class MeshThreeFactory<in T : Solid>(
                 name.startsWith(EDGES_KEY) -> mesh.applyEdges(obj)
                 else -> mesh.updateProperty(obj, name)
             }
-        }
+        }.launchIn(three.updateScope)
+
         return mesh
     }
 
@@ -72,7 +75,7 @@ public abstract class MeshThreeFactory<in T : Solid>(
     }
 }
 
-fun Mesh.applyProperties(obj: Solid): Mesh = apply{
+internal fun Mesh.applyProperties(obj: Solid): Mesh = apply {
     material = getMaterial(obj, true)
     applyEdges(obj)
     applyWireFrame(obj)
@@ -82,7 +85,7 @@ fun Mesh.applyProperties(obj: Solid): Mesh = apply{
     }
 }
 
-fun Mesh.applyEdges(obj: Solid) {
+internal fun Mesh.applyEdges(obj: Solid) {
     val edges = children.find { it.name == "@edges" } as? LineSegments
     //inherited edges definition, enabled by default
     if (obj.getProperty(MeshThreeFactory.EDGES_ENABLED_KEY).boolean != false) {
@@ -108,7 +111,7 @@ fun Mesh.applyEdges(obj: Solid) {
     }
 }
 
-fun Mesh.applyWireFrame(obj: Solid) {
+internal fun Mesh.applyWireFrame(obj: Solid) {
     children.find { it.name == "@wireframe" }?.let {
         remove(it)
         (it as LineSegments).dispose()
@@ -116,7 +119,8 @@ fun Mesh.applyWireFrame(obj: Solid) {
     //inherited wireframe definition, disabled by default
     if (obj.getProperty(MeshThreeFactory.WIREFRAME_ENABLED_KEY).boolean == true) {
         val bufferGeometry = geometry as? BufferGeometry ?: return
-        val material = ThreeMaterials.getLineMaterial(obj.getProperty(MeshThreeFactory.WIREFRAME_MATERIAL_KEY).node, true)
+        val material =
+            ThreeMaterials.getLineMaterial(obj.getProperty(MeshThreeFactory.WIREFRAME_MATERIAL_KEY).node, true)
         add(
             LineSegments(
                 WireframeGeometry(bufferGeometry),

visionforge-threejs/src/main/kotlin/hep/dataforge/vision/solid/three/ThreeConvexFactory.kt

@@ -2,11 +2,10 @@ package hep.dataforge.vision.solid.three
 
 import hep.dataforge.vision.solid.Convex
 import info.laht.threekt.external.geometries.ConvexBufferGeometry
-import info.laht.threekt.math.Vector3
 
 public object ThreeConvexFactory : MeshThreeFactory<Convex>(Convex::class) {
     override fun buildGeometry(obj: Convex): ConvexBufferGeometry {
-        @Suppress("USELESS_CAST") val vectors = obj.points.toTypedArray() as Array<Vector3>
+        val vectors = obj.points.map { it.toVector() }.toTypedArray()
         return ConvexBufferGeometry(vectors)
     }
 }

visionforge-threejs/src/main/kotlin/hep/dataforge/vision/solid/three/ThreeFactory.kt

@@ -22,7 +22,7 @@ public interface ThreeFactory<in T : Vision> {
 
     public val type: KClass<in T>
 
-    public operator fun invoke(obj: T): Object3D
+    public operator fun invoke(three: ThreePlugin, obj: T): Object3D
 
     public companion object {
         public const val TYPE: String = "threeFactory"

visionforge-threejs/src/main/kotlin/hep/dataforge/vision/solid/three/ThreeLabelFactory.kt

@@ -1,12 +1,15 @@
 package hep.dataforge.vision.solid.three
 
 
+import hep.dataforge.context.logger
 import hep.dataforge.vision.solid.SolidLabel
 import hep.dataforge.vision.solid.three.ThreeMaterials.getMaterial
 import info.laht.threekt.core.Object3D
 import info.laht.threekt.geometries.TextBufferGeometry
 import info.laht.threekt.objects.Mesh
 import kotlinext.js.jsObject
+import kotlinx.coroutines.flow.launchIn
+import kotlinx.coroutines.flow.onEach
 import kotlin.reflect.KClass
 
 /**
@@ -15,18 +18,19 @@ import kotlin.reflect.KClass
 public object ThreeLabelFactory : ThreeFactory<SolidLabel> {
     override val type: KClass<in SolidLabel> get() = SolidLabel::class
 
-    override fun invoke(obj: SolidLabel): Object3D {
+    override fun invoke(three: ThreePlugin, obj: SolidLabel): Object3D {
         val textGeo = TextBufferGeometry(obj.text, jsObject {
             font = obj.fontFamily
             size = 20
             height = 1
             curveSegments = 1
         })
-        return Mesh(textGeo, getMaterial(obj,true)).apply {
+        return Mesh(textGeo, getMaterial(obj, true)).apply {
             updatePosition(obj)
-            obj.onPropertyChange(this@ThreeLabelFactory) { _ ->
+            obj.propertyInvalidated.onEach { _ ->
                 //TODO
-            }
+                three.logger.warn{"Label parameter change not implemented"}
+            }.launchIn(three.updateScope)
         }
     }
 }

visionforge-threejs/src/main/kotlin/hep/dataforge/vision/solid/three/ThreeLineFactory.kt

@@ -9,12 +9,14 @@ import info.laht.threekt.core.Geometry
 import info.laht.threekt.core.Object3D
 import info.laht.threekt.math.Color
 import info.laht.threekt.objects.LineSegments
+import kotlinx.coroutines.flow.launchIn
+import kotlinx.coroutines.flow.onEach
 import kotlin.reflect.KClass
 
 public object ThreeLineFactory : ThreeFactory<PolyLine> {
     override val type: KClass<PolyLine> get() = PolyLine::class
 
-    override fun invoke(obj: PolyLine): Object3D {
+    override fun invoke(three: ThreePlugin, obj: PolyLine): Object3D {
         val geometry = Geometry().apply {
             vertices = Array(obj.points.size) { obj.points[it].toVector() }
         }
@@ -28,9 +30,9 @@ public object ThreeLineFactory : ThreeFactory<PolyLine> {
             updatePosition(obj)
             //layers.enable(obj.layer)
             //add listener to object properties
-            obj.onPropertyChange(this) { propertyName ->
+            obj.propertyInvalidated.onEach { propertyName ->
                 updateProperty(obj, propertyName)
-            }
+            }.launchIn(three.updateScope)
         }
     }
 

visionforge-threejs/src/main/kotlin/hep/dataforge/vision/solid/three/ThreePlugin.kt

@@ -9,6 +9,9 @@ import hep.dataforge.vision.solid.*
 import hep.dataforge.vision.solid.specifications.Canvas3DOptions
 import hep.dataforge.vision.visible
 import info.laht.threekt.core.Object3D
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.flow.launchIn
+import kotlinx.coroutines.flow.onEach
 import org.w3c.dom.Element
 import org.w3c.dom.HTMLElement
 import kotlin.collections.set
@@ -24,6 +27,9 @@ public class ThreePlugin : AbstractPlugin(), ElementVisionRenderer {
     private val compositeFactory = ThreeCompositeFactory(this)
     private val refFactory = ThreeReferenceFactory(this)
 
+    //TODO generate a separate supervisor update scope
+    internal val updateScope: CoroutineScope get() = context
+
     init {
         //Add specialized factories here
         objectFactories[Box::class] = ThreeBoxFactory
@@ -44,7 +50,7 @@ public class ThreePlugin : AbstractPlugin(), ElementVisionRenderer {
     public fun buildObject3D(obj: Solid): Object3D {
         return when (obj) {
             is ThreeVision -> obj.render()
-            is SolidReference -> refFactory(obj)
+            is SolidReferenceGroup -> refFactory(obj)
             is SolidGroup -> {
                 val group = ThreeGroup()
                 obj.children.forEach { (token, child) ->
@@ -63,7 +69,7 @@ public class ThreePlugin : AbstractPlugin(), ElementVisionRenderer {
                     updatePosition(obj)
                     //obj.onChildrenChange()
 
-                    obj.onPropertyChange(this) { name ->
+                    obj.propertyInvalidated.onEach { name ->
                         if (
                             name.startsWith(Solid.POSITION_KEY) ||
                             name.startsWith(Solid.ROTATION) ||
@@ -74,9 +80,9 @@ public class ThreePlugin : AbstractPlugin(), ElementVisionRenderer {
                         } else if (name == Vision.VISIBLE_KEY) {
                             visible = obj.visible ?: true
                         }
-                    }
+                    }.launchIn(updateScope)
 
-                    obj.onStructureChange(this) { nameToken, _, child ->
+                    obj.structureChanges.onEach { (nameToken, _, child) ->
 //                        if (name.isEmpty()) {
 //                            logger.error { "Children change with empty name on $group" }
 //                            return@onChildrenChange
@@ -99,7 +105,7 @@ public class ThreePlugin : AbstractPlugin(), ElementVisionRenderer {
                                 logger.error(ex) { "Failed to render $child" }
                             }
                         }
-                    }
+                    }.launchIn(updateScope)
                 }
             }
             is Composite -> compositeFactory(obj)

visionforge-threejs/src/main/kotlin/hep/dataforge/vision/solid/three/ThreeReferenceFactory.kt

@@ -4,17 +4,19 @@ import hep.dataforge.names.cutFirst
 import hep.dataforge.names.firstOrNull
 import hep.dataforge.names.toName
 import hep.dataforge.vision.solid.Solid
-import hep.dataforge.vision.solid.SolidReference
+import hep.dataforge.vision.solid.SolidReferenceGroup
-import hep.dataforge.vision.solid.SolidReference.Companion.REFERENCE_CHILD_PROPERTY_PREFIX
+import hep.dataforge.vision.solid.SolidReferenceGroup.Companion.REFERENCE_CHILD_PROPERTY_PREFIX
 import info.laht.threekt.core.BufferGeometry
 import info.laht.threekt.core.Object3D
 import info.laht.threekt.objects.Mesh
+import kotlinx.coroutines.flow.launchIn
+import kotlinx.coroutines.flow.onEach
 import kotlin.reflect.KClass
 
-public class ThreeReferenceFactory(public val three: ThreePlugin) : ThreeFactory<SolidReference> {
+public class ThreeReferenceFactory(public val three: ThreePlugin) : ThreeFactory<SolidReferenceGroup> {
     private val cache = HashMap<Solid, Object3D>()
 
-    override val type: KClass<SolidReference> = SolidReference::class
+    override val type: KClass<SolidReferenceGroup> = SolidReferenceGroup::class
 
     private fun Object3D.replicate(): Object3D {
         return when (this) {
@@ -30,7 +32,7 @@ public class ThreeReferenceFactory(public val three: ThreePlugin) : ThreeFactory
         }
     }
 
-    override fun invoke(obj: SolidReference): Object3D {
+    override fun invoke(obj: SolidReferenceGroup): Object3D {
         val template = obj.prototype
         val cachedObject = cache.getOrPut(template) {
             three.buildObject3D(template)
@@ -43,7 +45,9 @@ public class ThreeReferenceFactory(public val three: ThreePlugin) : ThreeFactory
             object3D.applyProperties(obj)
         }
 
-        obj.onPropertyChange(this) { name ->
+        //TODO apply child properties
+
+        obj.propertyInvalidated.onEach { name->
             if (name.firstOrNull()?.body == REFERENCE_CHILD_PROPERTY_PREFIX) {
                 val childName = name.firstOrNull()?.index?.toName() ?: error("Wrong syntax for reference child property: '$name'")
                 val propertyName = name.cutFirst()
@@ -53,7 +57,8 @@ public class ThreeReferenceFactory(public val three: ThreePlugin) : ThreeFactory
             } else {
                 object3D.updateProperty(obj, name)
             }
-        }
+        }.launchIn(three.updateScope)
+
 
         return object3D
     }