Migrate to DF 0.3

build.gradle.kts

@@ -2,8 +2,8 @@ plugins {
     id("ru.mipt.npm.project")
 }
 
-val dataforgeVersion by extra("0.2.1-dev-5")
+val dataforgeVersion by extra("0.3.0-dev")
-val ktorVersion by extra("1.4.3")
+val ktorVersion by extra("1.5.0")
 val htmlVersion by extra("0.7.2")
 val kotlinWrappersVersion by extra("pre.129-kotlin-1.4.20")
 val fxVersion by extra("14")

demo/gdml/src/jvmMain/kotlin/hep/dataforge/vision/gdml/demo/readFile.kt

@@ -1,7 +1,6 @@
 package hep.dataforge.vision.gdml.demo
 
 import hep.dataforge.meta.DFExperimental
-import hep.dataforge.meta.setItem
 import hep.dataforge.values.asValue
 import hep.dataforge.vision.gdml.readFile
 import hep.dataforge.vision.gdml.toVision

demo/spatial-showcase/src/commonMain/kotlin/hep/dataforge/vision/solid/demo/demo.kt

@@ -39,15 +39,18 @@ fun Page<Solid>.showcase() {
     demo("shapes", "Basic shapes") {
         box(100.0, 100.0, 100.0) {
             z = -110.0
+            color("teal")
         }
         sphere(50.0) {
             x = 110
             detail = 16
+            color("red")
         }
         tube(50, height = 10, innerRadius = 25, angle = PI) {
             y = 110
             detail = 16
             rotationX = PI / 4
+            color("blue")
         }
     }
 
@@ -55,6 +58,7 @@ fun Page<Solid>.showcase() {
         val group = group {
             box(100, 100, 100) {
                 z = 110.0
+                opacity = 0.5
             }
 
             box(100, 100, 100) {
@@ -155,7 +159,7 @@ fun Page<Solid>.showcaseCSG() {
                 detail = 32
             }
             color(Colors.lightgreen)
-            opacity = 0.3
+            opacity = 0.5
         }
         composite(CompositeType.SUBTRACT) {
             y = -300
@@ -173,9 +177,11 @@ fun Page<Solid>.showcaseCSG() {
     demo("CSG.custom", "CSG with manually created object") {
         intersect {
             tube(60, 10) {
-                detail = 64
+                detail = 32
             }
             box(100, 100, 100)
+            color("red")
+            opacity = 0.5
         }
     }
 }

demo/spatial-showcase/src/jsMain/kotlin/hep/dataforge/vision/solid/demo/VariableBox.kt

@@ -9,7 +9,6 @@ import hep.dataforge.vision.set
 import hep.dataforge.vision.setProperty
 import hep.dataforge.vision.solid.*
 import hep.dataforge.vision.solid.Solid.Companion.GEOMETRY_KEY
-import hep.dataforge.vision.solid.SolidMaterial.Companion.MATERIAL_COLOR_KEY
 import hep.dataforge.vision.solid.three.*
 import info.laht.threekt.core.BufferGeometry
 import info.laht.threekt.core.Object3D
@@ -30,8 +29,6 @@ internal class VariableBox(xSize: Number, ySize: Number, zSize: Number) : ThreeV
         scaleX = xSize
         scaleY = ySize
         scaleZ = zSize
-//        getProperty(MeshThreeFactory.EDGES_ENABLED_KEY, inherit = false, includeStyles = false)
-//        getProperty(MeshThreeFactory.WIREFRAME_ENABLED_KEY, inherit = false, includeStyles = false)
     }
 
     override fun render(three: ThreePlugin): Object3D {
@@ -69,11 +66,8 @@ internal class VariableBox(xSize: Number, ySize: Number, zSize: Number) : ThreeV
                     mesh.scale.set(newXSize, newYSize, newZSize)
                     mesh.updateMatrix()
                 }
-                //name.startsWith(MeshThreeFactory.WIREFRAME_KEY) -> mesh.applyWireFrame(this@VariableBox)
                 name.startsWith(MeshThreeFactory.EDGES_KEY) -> mesh.applyEdges(this@VariableBox)
-                name.startsWith(MATERIAL_COLOR_KEY) -> {
+                //name.startsWith(MATERIAL_COLOR_KEY) -> mesh.updateMaterialProperty(this, name)
-                    mesh.updateMaterial(this)
-                }
                 else -> mesh.updateProperty(this@VariableBox, name)
             }
         }

ui/react/src/main/kotlin/hep/dataforge/vision/react/MetaViewer.kt

@@ -1,7 +1,8 @@
 package hep.dataforge.vision.react
 
 import hep.dataforge.meta.Meta
-import hep.dataforge.meta.MetaItem
+import hep.dataforge.meta.NodeItem
+import hep.dataforge.meta.ValueItem
 import hep.dataforge.meta.descriptors.ItemDescriptor
 import hep.dataforge.meta.descriptors.NodeDescriptor
 import hep.dataforge.meta.descriptors.defaultItem
@@ -51,7 +52,7 @@ private fun RBuilder.metaViewerItem(props: MetaViewerProps) {
     }
 
     when (actualItem) {
-        is MetaItem.NodeItem -> {
+        is NodeItem -> {
             styledDiv {
                 css {
                     +TreeStyles.treeLeaf
@@ -108,7 +109,7 @@ private fun RBuilder.metaViewerItem(props: MetaViewerProps) {
                 }
             }
         }
-        is MetaItem.ValueItem -> {
+        is ValueItem -> {
             styledDiv {
                 css {
                     +TreeStyles.treeLeaf

ui/react/src/main/kotlin/hep/dataforge/vision/react/PropertyEditor.kt

@@ -9,6 +9,7 @@ import hep.dataforge.names.plus
 import hep.dataforge.values.Value
 import hep.dataforge.vision.hidden
 import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.channels.awaitClose
 import kotlinx.coroutines.flow.Flow
@@ -65,12 +66,12 @@ private val PropertyEditorItem: FunctionalComponent<PropertyEditorProps> =
 private fun RBuilder.propertyEditorItem(props: PropertyEditorProps) {
     var expanded: Boolean by useState { true }
     val itemName by useState { props.name ?: Name.EMPTY }
-    var item: MetaItem<*>? by useState { props.provider.getItem(itemName) }
+    var item: MetaItem? by useState { props.provider.getItem(itemName) }
     val descriptorItem: ItemDescriptor? = props.descriptor?.get(itemName)
 
     if(descriptorItem?.hidden == true) return //fail fast for hidden property
 
-    var actualItem: MetaItem<Meta>? by useState {
+    var actualItem: MetaItem? by useState {
         item ?: props.defaultProvider?.getItem(itemName) ?: descriptorItem?.defaultItem()
     }
 
@@ -110,7 +111,7 @@ private fun RBuilder.propertyEditorItem(props: PropertyEditorProps) {
         update()
     }
 
-    if (actualItem is MetaItem.NodeItem) {
+    if (actualItem is NodeItem) {
         styledDiv {
             css {
                 +TreeStyles.treeLeaf
@@ -248,6 +249,7 @@ public fun RBuilder.propertyEditor(
     }
 }
 
+@OptIn(ExperimentalCoroutinesApi::class)
 private fun Config.flowUpdates(): Flow<Name> = callbackFlow {
     onChange(this) { name, _, _ ->
         launch {

ui/react/src/main/kotlin/hep/dataforge/vision/react/TreeStyles.kt

@@ -17,7 +17,7 @@ public object TreeStyles : StyleSheet("treeStyles", true) {
     /**
      * Style the caret/arrow
      */
-    public val treeCaret by css {
+    public val treeCaret: RuleSet by css {
         cursor = Cursor.pointer
         userSelect = UserSelect.none
         /* Create the caret/arrow with a unicode, and style it */
@@ -32,7 +32,7 @@ public object TreeStyles : StyleSheet("treeStyles", true) {
     /**
      *  Rotate the caret/arrow icon when clicked on (using JavaScript)
      */
-    val treeCaredDown by css {
+    public val treeCaredDown:RuleSet by css {
         before {
             content = "\u25B6".quoted
             color = Color.black
@@ -42,7 +42,7 @@ public object TreeStyles : StyleSheet("treeStyles", true) {
         }
     }
 
-    val treeItem by css {
+    public val treeItem:RuleSet by css {
         alignItems = Align.center
         paddingLeft = 10.px
         borderLeftStyle = BorderStyle.dashed
@@ -53,27 +53,27 @@ public object TreeStyles : StyleSheet("treeStyles", true) {
         borderBottomColor = Color.lightGray
     }
 
-    val treeLeaf by css {
+    public val treeLeaf:RuleSet by css {
         display = Display.flex
         flexDirection = FlexDirection.row
         flexWrap = FlexWrap.nowrap
         //alignItems = Align.center
     }
 
-    val treeLabel by css {
+    public val treeLabel:RuleSet by css {
         overflow = Overflow.hidden
         flex(flexGrow = 1.0, flexShrink = 1.0)
     }
 
-    val treeLabelInactive by css {
+    public val treeLabelInactive: RuleSet by css {
         color = Color.lightGray
     }
 
-    val treeLabelSelected by css {
+    public val treeLabelSelected:RuleSet by css {
         backgroundColor = Color.lightBlue
     }
 
-    val linkButton by css {
+    public val linkButton:RuleSet by css {
         backgroundColor = Color.white
         border = "none"
         padding(left = 4.pt, right = 4.pt, top = 0.pt, bottom = 0.pt)
@@ -86,7 +86,7 @@ public object TreeStyles : StyleSheet("treeStyles", true) {
         }
     }
 
-    val removeButton by css {
+    public val removeButton:RuleSet by css {
         backgroundColor = Color.white
         borderStyle = BorderStyle.solid
         borderRadius = 2.px
@@ -104,7 +104,7 @@ public object TreeStyles : StyleSheet("treeStyles", true) {
         }
     }
 
-    val resizeableInput by css {
+    public val resizeableInput: RuleSet by css {
         overflow = Overflow.hidden
         maxWidth = 120.pt
         flex(flexGrow = 2.0, flexShrink = 2.0, flexBasis = 60.pt)

ui/react/src/main/kotlin/hep/dataforge/vision/react/valueChooser.kt

@@ -20,7 +20,7 @@ import styled.styledInput
 import styled.styledSelect
 
 public external interface ValueChooserProps : RProps {
-    var item: MetaItem<*>?
+    var item: MetaItem?
     var descriptor: ValueDescriptor?
     var valueChanged: ((Value?) -> Unit)?
 }
@@ -140,7 +140,7 @@ class ValueChooserComponent(props: ValueChooserProps) : RComponent<ValueChooserP
 
 internal fun RBuilder.valueChooser(
     name: Name,
-    item: MetaItem<*>?,
+    item: MetaItem?,
     descriptor: ValueDescriptor? = null,
     callback: (Value?) -> Unit
 ) {

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

@@ -1,8 +1,6 @@
 package hep.dataforge.vision
 
-import hep.dataforge.meta.MetaItem
+import hep.dataforge.meta.*
-import hep.dataforge.meta.get
-import hep.dataforge.meta.number
 import hep.dataforge.values.ValueType
 import hep.dataforge.values.int
 import hep.dataforge.values.string
@@ -192,9 +190,9 @@ public object Colors {
     /**
      * Convert color represented as Meta to string of format #rrggbb
      */
-    fun fromMeta(item: MetaItem<*>): String {
+    fun fromMeta(item: MetaItem): String {
         return when (item) {
-            is MetaItem.NodeItem<*> -> {
+            is NodeItem -> {
                 val node = item.node
                 rgbToString(
                     node[RED_KEY].number?.toByte()?.toUByte() ?: 0u,
@@ -202,7 +200,7 @@ public object Colors {
                     node[BLUE_KEY].number?.toByte()?.toUByte() ?: 0u
                 )
             }
-            is MetaItem.ValueItem -> {
+            is ValueItem -> {
                 if (item.value.type == ValueType.NUMBER) {
                     rgbToString(item.value.int)
                 } else {

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

@@ -40,7 +40,7 @@ public inline class StyleSheet(private val owner: VisionGroup) {
      * Create and set a style
      */
     public operator fun set(key: String, builder: MetaBuilder.() -> Unit) {
-        val newStyle = get(key)?.edit(builder) ?: Meta(builder)
+        val newStyle = get(key)?.builder()?.apply(builder) ?: Meta(builder)
         set(key, newStyle.seal())
     }
 
@@ -99,7 +99,7 @@ public tailrec fun Vision.getStyle(name: String): Meta? =
 /**
  * Resolve an item in all style layers
  */
-public fun Vision.getStyleItems(name: Name): Sequence<MetaItem<*>> {
+public fun Vision.getStyleItems(name: Name): Sequence<MetaItem> {
     return styles.asSequence().map {
         getStyle(it)
     }.map {

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

@@ -1,5 +1,6 @@
 package hep.dataforge.vision
 
+import hep.dataforge.meta.Meta
 import hep.dataforge.meta.MetaItem
 import hep.dataforge.meta.MutableItemProvider
 import hep.dataforge.meta.descriptors.Described
@@ -28,6 +29,12 @@ public interface Vision : Described {
     @Transient
     public var parent: VisionGroup?
 
+    /**
+     * Properties belonging to this [Vision] potentially including artificial properties
+     */
+    @Transient
+    public val meta: Meta
+
     /**
      * A coroutine scope for asynchronous calls and locks
      */
@@ -37,7 +44,7 @@ public interface Vision : Described {
      * A fast accessor method to get own property (no inheritance or styles).
      * Should be equivalent to `getProperty(name,false,false,false)`.
      */
-    public fun getOwnProperty(name: Name): MetaItem<*>?
+    public fun getOwnProperty(name: Name): MetaItem?
 
     /**
      * Get property.
@@ -49,13 +56,13 @@ public interface Vision : Described {
         inherit: Boolean = false,
         includeStyles: Boolean = true,
         includeDefaults: Boolean = true,
-    ): MetaItem<*>?
+    ): MetaItem?
 
 
     /**
      * Set the property value
      */
-    public fun setProperty(name: Name, item: MetaItem<*>?, notify: Boolean = true)
+    public fun setProperty(name: Name, item: MetaItem?, notify: Boolean = true)
 
     /**
      * Subscribe on property updates. The subscription is bound to the given [scope] and canceled when the scope is canceled
@@ -109,8 +116,8 @@ public fun Vision.asyncNotifyPropertyChange(propertyName: Name) {
  */
 public val Vision.ownProperties: MutableItemProvider
     get() = object : MutableItemProvider {
-        override fun getItem(name: Name): MetaItem<*>? = getOwnProperty(name)
+        override fun getItem(name: Name): MetaItem? = getOwnProperty(name)
-        override fun setItem(name: Name, item: MetaItem<*>?): Unit = setProperty(name, item)
+        override fun setItem(name: Name, item: MetaItem?): Unit = setProperty(name, item)
     }
 
 
@@ -123,14 +130,14 @@ public fun Vision.allProperties(
     includeStyles: Boolean? = null,
     includeDefaults: Boolean = true,
 ): MutableItemProvider = object : MutableItemProvider {
-    override fun getItem(name: Name): MetaItem<*>? = getProperty(
+    override fun getItem(name: Name): MetaItem? = getProperty(
         name,
         inherit = inherit ?: (descriptor?.get(name)?.inherited != false),
         includeStyles = includeStyles ?: (descriptor?.get(name)?.usesStyles == true),
         includeDefaults = includeDefaults
     )
 
-    override fun setItem(name: Name, item: MetaItem<*>?): Unit = setProperty(name, item)
+    override fun setItem(name: Name, item: MetaItem?): Unit = setProperty(name, item)
 }
 
 /**
@@ -141,7 +148,7 @@ public fun Vision.getProperty(
     inherit: Boolean = false,
     includeStyles: Boolean = true,
     includeDefaults: Boolean = true,
-): MetaItem<*>? = getProperty(key.toName(), inherit, includeStyles, includeDefaults)
+): MetaItem? = getProperty(key.toName(), inherit, includeStyles, includeDefaults)
 
 /**
  * A convenience method to pair [getProperty]

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

@@ -1,9 +1,6 @@
 package hep.dataforge.vision
 
-import hep.dataforge.meta.Config
+import hep.dataforge.meta.*
-import hep.dataforge.meta.MetaItem
-import hep.dataforge.meta.MutableMeta
-import hep.dataforge.meta.asMetaItem
 import hep.dataforge.meta.descriptors.NodeDescriptor
 import hep.dataforge.meta.descriptors.defaultItem
 import hep.dataforge.meta.descriptors.get
@@ -40,14 +37,14 @@ public open class VisionBase : Vision {
     /**
      * Object own properties excluding styles and inheritance
      */
-    public var properties: Config? = null
+    internal var properties: Config? = null
-        private set
+
+    override val meta: Meta get() = properties ?: Meta.EMPTY
 
     @Synchronized
     private fun getOrCreateConfig(): Config {
         if (properties == null) {
             val newProperties = Config()
-            properties = newProperties
             newProperties.onChange(this) { name, oldItem, newItem ->
                 if (oldItem != newItem) {
                     scope.launch {
@@ -55,6 +52,7 @@ public open class VisionBase : Vision {
                     }
                 }
             }
+            properties = newProperties
         }
         return properties!!
     }
@@ -62,7 +60,7 @@ public open class VisionBase : Vision {
     /**
      * A fast accessor method to get own property (no inheritance or styles
      */
-    override fun getOwnProperty(name: Name): MetaItem<*>? {
+    override fun getOwnProperty(name: Name): MetaItem? {
         return properties?.getItem(name)
     }
 
@@ -71,7 +69,7 @@ public open class VisionBase : Vision {
         inherit: Boolean,
         includeStyles: Boolean,
         includeDefaults: Boolean,
-    ): MetaItem<*>? = sequence {
+    ): MetaItem? = sequence {
         yield(getOwnProperty(name))
         if (includeStyles) {
             yieldAll(getStyleItems(name))
@@ -83,7 +81,7 @@ public open class VisionBase : Vision {
     }.merge()
 
     @Synchronized
-    override fun setProperty(name: Name, item: MetaItem<*>?, notify: Boolean) {
+    override fun setProperty(name: Name, item: MetaItem?, notify: Boolean) {
         getOrCreateConfig().setItem(name, item)
         if (notify) {
             scope.launch {
@@ -121,23 +119,17 @@ public open class VisionBase : Vision {
         propertyInvalidationFlow.emit(propertyName)
     }
 
-    public fun configure(block: suspend MutableMeta<*>.() -> Unit) {
-        scope.launch {
-            getOrCreateConfig().block()
-        }
-    }
-
     override fun update(change: VisionChange) {
 
-        fun updateProperties(at: Name, item: MetaItem<*>) {
+        fun updateProperties(at: Name, item: MetaItem) {
             when (item) {
-                is MetaItem.ValueItem -> {
+                is ValueItem -> {
                     if (item.value == Null) {
                         setProperty(at, null)
                     } else
                         setProperty(at, item)
                 }
-                is MetaItem.NodeItem -> item.node.items.forEach { (token, childItem) ->
+                is NodeItem -> item.node.items.forEach { (token, childItem) ->
                     updateProperties(at + token, childItem)
                 }
             }

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

@@ -29,7 +29,7 @@ public class VisionChangeBuilder : VisionContainerBuilder<Vision> {
     private fun getOrPutChild(visionName: Name): VisionChangeBuilder =
         children.getOrPut(visionName) { VisionChangeBuilder() }
 
-    public fun propertyChanged(visionName: Name, propertyName: Name, item: MetaItem<*>?) {
+    public fun propertyChanged(visionName: Name, propertyName: Name, item: MetaItem?) {
         if (visionName == Name.EMPTY) {
             //Write property removal as [Null]
             propertyChange[propertyName] = (item ?: Null.asMetaItem())

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

@@ -12,7 +12,7 @@ public interface VisionPropertyContainer<out T> {
         inherit: Boolean = false,
         includeStyles: Boolean = true,
         includeDefaults: Boolean = true,
-    ): MetaItem<*>?
+    ): MetaItem?
 
-    public fun setProperty(name: Name, item: MetaItem<*>?, notify: Boolean = true)
+    public fun setProperty(name: Name, item: MetaItem?, notify: Boolean = true)
 }

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

@@ -6,20 +6,16 @@ import hep.dataforge.values.asValue
 @DslMarker
 public annotation class VisionBuilder
 
-public fun Sequence<MetaItem<*>?>.merge(): MetaItem<*>? = when (val first = firstOrNull { it != null }) {
+public fun Sequence<MetaItem?>.merge(): MetaItem? = when (val first = firstOrNull { it != null }) {
     null -> null
-    is MetaItem.ValueItem -> first //fast search for first entry if it is value
+    is ValueItem -> first //fast search for first entry if it is value
-    is MetaItem.NodeItem -> {
+    is NodeItem -> {
         //merge nodes if first encountered node is meta
         val laminate: Laminate = Laminate(mapNotNull { it.node }.toList())
-        MetaItem.NodeItem(laminate)
+        NodeItem(laminate)
     }
 }
 
-@DFExperimental
-public val Vision.properties: Config?
-    get() = (this as? VisionBase)?.properties
-
 /**
  * Control visibility of the element
  */
@@ -29,4 +25,4 @@ public var Vision.visible: Boolean?
 
 public fun Vision.configure(meta: Meta?): Unit = update(VisionChange(properties = meta))
 
-public fun Vision.configure(block: MutableMeta<*>.() -> Unit): Unit = configure(Meta(block))
+public fun Vision.configure(block: MetaBuilder.() -> Unit): Unit = configure(Meta(block))

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

@@ -3,6 +3,7 @@ package hep.dataforge.vision.html
 import hep.dataforge.meta.DFExperimental
 import hep.dataforge.meta.set
 import hep.dataforge.vision.VisionBase
+import hep.dataforge.vision.configure
 import kotlinx.html.*
 import kotlinx.html.stream.createHTML
 import kotlin.test.Test
@@ -34,7 +35,7 @@ class HtmlTagTest {
         div {
             h2 { +"Properties" }
             ul {
-                (vision as? VisionBase)?.properties?.items?.forEach {
+                (vision as? VisionBase)?.meta?.items?.forEach {
                     li {
                         a { +it.key.toString() }
                         p { +it.value.toString() }

visionforge-core/src/jsMain/kotlin/hep/dataforge/vision/client/VisionClient.kt

@@ -138,7 +138,7 @@ public class VisionClient : AbstractPlugin() {
                             renderVision(element, change.vision, outputMeta)
                         }
 
-                        logger.info { "Got update ${change.toString()} for output with name $name" }
+                        logger.debug { "Got update $change for output with name $name" }
                         visionMap[element]?.update(change)
                             ?: console.info("Target vision for element $element with name $name not found")
                     } else {

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

@@ -18,7 +18,7 @@ import tornadofx.*
 /**
  * A display for meta and descriptor
  */
-sealed class FXMeta<M : MetaNode<M>> : Comparable<FXMeta<*>> {
+sealed class FXMeta<M : TypedMeta<M>> : Comparable<FXMeta<*>> {
     abstract val name: NameToken
     abstract val parent: FXMetaNode<M>?
     abstract val descriptionProperty: ObservableStringValue
@@ -35,7 +35,7 @@ sealed class FXMeta<M : MetaNode<M>> : Comparable<FXMeta<*>> {
     }
 
     companion object {
-        fun <M : MetaNode<M>> root(
+        fun <M : TypedMeta<M>> root(
             node: M,
             descriptor: NodeDescriptor? = null,
             rootName: String = "root"
@@ -47,7 +47,7 @@ sealed class FXMeta<M : MetaNode<M>> : Comparable<FXMeta<*>> {
     }
 }
 
-class FXMetaNode<M : MetaNode<M>>(
+class FXMetaNode<M : TypedMeta<M>>(
     override val name: NameToken,
     override val parent: FXMetaNode<M>?,
     nodeValue: M? = null,
@@ -89,7 +89,7 @@ class FXMetaNode<M : MetaNode<M>>(
         init {
             bind(nodeProperty, descriptorProperty)
 
-            val listener: (Name, MetaItem<*>?, MetaItem<*>?) -> Unit = { name, _, _ ->
+            val listener: (Name, MetaItem?, MetaItem?) -> Unit = { name, _, _ ->
                 if (name.length == 1) invalidate()
             }
 
@@ -115,7 +115,7 @@ class FXMetaNode<M : MetaNode<M>>(
                 val actualItem = node?.items?.get(token)
                 val actualDescriptor = descriptor?.items?.get(token.body)
 
-                if (actualItem is MetaItem.NodeItem || actualDescriptor is NodeDescriptor) {
+                if (actualItem is NodeItem || actualDescriptor is NodeDescriptor) {
                     FXMetaNode(token, this@FXMetaNode)
                 } else {
                     FXMetaValue(token, this@FXMetaNode)
@@ -134,7 +134,7 @@ class FXMetaNode<M : MetaNode<M>>(
     }
 }
 
-public class FXMetaValue<M : MetaNode<M>>(
+public class FXMetaValue<M : TypedMeta<M>>(
     override val name: NameToken,
     override val parent: FXMetaNode<M>
 ) : FXMeta<M>() {
@@ -151,10 +151,10 @@ public class FXMetaValue<M : MetaNode<M>>(
     //private val innerValueProperty = SimpleObjectProperty(value)
 
     public val valueProperty = descriptorProperty.objectBinding { descriptor ->
-        parent.node[name].value ?: descriptor?.default
+        parent.node?.get(name).value ?: descriptor?.default
     }
 
-    override val hasValue: ObservableBooleanValue = parent.nodeProperty.booleanBinding { it[name] != null }
+    override val hasValue: ObservableBooleanValue = parent.nodeProperty.booleanBinding { it?.get(name) != null }
 
     public val value by valueProperty
 
@@ -169,12 +169,12 @@ public fun <M : MutableMeta<M>> FXMetaNode<M>.remove(name: NameToken) {
 private fun <M : MutableMeta<M>> M.createEmptyNode(token: NameToken, append: Boolean): M {
     return if (append && token.hasIndex()) {
         val name = token.asName()
-        val index = (getIndexed(name).keys.mapNotNull { it.toIntOrNull() }.max() ?: -1) + 1
+        val index = (getIndexed(name).keys.mapNotNull { it?.toIntOrNull() }.maxOrNull() ?: -1) + 1
         val newName = name.withIndex(index.toString())
         set(newName, Meta.EMPTY)
         get(newName).node!!
     } else {
-        this.setNode(token.asName(), Meta.EMPTY)
+        this.set(token.asName(), Meta.EMPTY)
         //FIXME possible concurrency bug
         get(token).node!!
     }

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

@@ -1,9 +1,6 @@
 package hep.dataforge.vision.solid
 
-import hep.dataforge.meta.MetaItem
+import hep.dataforge.meta.*
-import hep.dataforge.meta.double
-import hep.dataforge.meta.get
-import hep.dataforge.meta.int
 import hep.dataforge.values.ValueType
 import hep.dataforge.values.int
 import hep.dataforge.values.string
@@ -35,9 +32,9 @@ public object FXMaterials {
  * Infer color based on meta item
  * @param opacity default opacity
  */
-public fun MetaItem<*>.color(opacity: Double = 1.0): Color {
+public fun MetaItem.color(opacity: Double = 1.0): Color {
     return when (this) {
-        is MetaItem.ValueItem -> if (this.value.type == ValueType.NUMBER) {
+        is ValueItem -> if (this.value.type == ValueType.NUMBER) {
             val int = value.int
             val red = int and 0x00ff0000 shr 16
             val green = int and 0x0000ff00 shr 8
@@ -46,7 +43,7 @@ public fun MetaItem<*>.color(opacity: Double = 1.0): Color {
         } else {
             Color.web(this.value.string)
         }
-        is MetaItem.NodeItem -> {
+        is NodeItem -> {
             Color.rgb(
                 node[Colors.RED_KEY]?.int ?: 0,
                 node[Colors.GREEN_KEY]?.int ?: 0,
@@ -60,11 +57,11 @@ public fun MetaItem<*>.color(opacity: Double = 1.0): Color {
 /**
  * Infer FX material based on meta item
  */
-public fun MetaItem<*>?.material(): Material {
+public fun MetaItem?.material(): Material {
     return when (this) {
         null -> FXMaterials.GREY
-        is MetaItem.ValueItem -> PhongMaterial(color())
+        is ValueItem -> PhongMaterial(color())
-        is MetaItem.NodeItem -> PhongMaterial().apply {
+        is NodeItem -> PhongMaterial().apply {
             val opacity = node[SolidMaterial.OPACITY_KEY].double ?: 1.0
             diffuseColor = node[SolidMaterial.COLOR_KEY]?.color(opacity) ?: Color.DARKGREY
             specularColor = node[SolidMaterial.SPECULAR_COLOR_KEY]?.color(opacity) ?: Color.WHITE

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

@@ -13,7 +13,7 @@ import tornadofx.*
  * A caching binding collection for [Vision] properties
  */
 class VisualObjectFXBinding(val fx: FX3DPlugin, val obj: Vision) {
-    private val bindings = HashMap<Name, ObjectBinding<MetaItem<*>?>>()
+    private val bindings = HashMap<Name, ObjectBinding<MetaItem?>>()
 
     init {
         obj.onPropertyChange(fx.context) { name ->
@@ -31,10 +31,10 @@ class VisualObjectFXBinding(val fx: FX3DPlugin, val obj: Vision) {
         }
     }
 
-    operator fun get(key: Name): ObjectBinding<MetaItem<*>?> {
+    operator fun get(key: Name): ObjectBinding<MetaItem?> {
         return bindings.getOrPut(key) {
-            object : ObjectBinding<MetaItem<*>?>() {
+            object : ObjectBinding<MetaItem?>() {
-                override fun computeValue(): MetaItem<*>? = obj.getProperty(key)
+                override fun computeValue(): MetaItem? = obj.getProperty(key)
             }
         }
     }
@@ -42,19 +42,19 @@ class VisualObjectFXBinding(val fx: FX3DPlugin, val obj: Vision) {
     operator fun get(key: String) = get(key.toName())
 }
 
-fun ObjectBinding<MetaItem<*>?>.value() = objectBinding { it.value }
+fun ObjectBinding<MetaItem?>.value() = objectBinding { it.value }
-fun ObjectBinding<MetaItem<*>?>.string() = stringBinding { it.string }
+fun ObjectBinding<MetaItem?>.string() = stringBinding { it.string }
-fun ObjectBinding<MetaItem<*>?>.number() = objectBinding { it.number }
+fun ObjectBinding<MetaItem?>.number() = objectBinding { it.number }
-fun ObjectBinding<MetaItem<*>?>.double() = objectBinding { it.double }
+fun ObjectBinding<MetaItem?>.double() = objectBinding { it.double }
-fun ObjectBinding<MetaItem<*>?>.float() = objectBinding { it.float }
+fun ObjectBinding<MetaItem?>.float() = objectBinding { it.float }
-fun ObjectBinding<MetaItem<*>?>.int() = objectBinding { it.int }
+fun ObjectBinding<MetaItem?>.int() = objectBinding { it.int }
-fun ObjectBinding<MetaItem<*>?>.long() = objectBinding { it.long }
+fun ObjectBinding<MetaItem?>.long() = objectBinding { it.long }
-fun ObjectBinding<MetaItem<*>?>.node() = objectBinding { it.node }
+fun ObjectBinding<MetaItem?>.node() = objectBinding { it.node }
 
-fun ObjectBinding<MetaItem<*>?>.string(default: String) = stringBinding { it.string ?: default }
+fun ObjectBinding<MetaItem?>.string(default: String) = stringBinding { it.string ?: default }
-fun ObjectBinding<MetaItem<*>?>.double(default: Double) = doubleBinding { it.double ?: default }
+fun ObjectBinding<MetaItem?>.double(default: Double) = doubleBinding { it.double ?: default }
-fun ObjectBinding<MetaItem<*>?>.float(default: Float) = floatBinding { it.float ?: default }
+fun ObjectBinding<MetaItem?>.float(default: Float) = floatBinding { it.float ?: default }
-fun ObjectBinding<MetaItem<*>?>.int(default: Int) = integerBinding { it.int ?: default }
+fun ObjectBinding<MetaItem?>.int(default: Int) = integerBinding { it.int ?: default }
-fun ObjectBinding<MetaItem<*>?>.long(default: Long) = longBinding { it.long ?: default }
+fun ObjectBinding<MetaItem?>.long(default: Long) = longBinding { it.long ?: default }
 
-fun <T> ObjectBinding<MetaItem<*>?>.transform(transform: (MetaItem<*>) -> T) = objectBinding { it?.let(transform) }
+fun <T> ObjectBinding<MetaItem?>.transform(transform: (MetaItem) -> T) = objectBinding { it?.let(transform) }

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

@@ -1,9 +1,8 @@
 package hep.dataforge.vision.gdml
 
 import hep.dataforge.meta.DFExperimental
-import hep.dataforge.meta.sequence
+import hep.dataforge.meta.itemSequence
 import hep.dataforge.vision.Vision
-import hep.dataforge.vision.properties
 import hep.dataforge.vision.solid.*
 
 public expect class Counter() {
@@ -27,7 +26,7 @@ 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.meta.itemSequence().forEach { (name, item) ->
             if (getProperty(name) == null) {
                 setProperty(name, item)
             }

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

@@ -1,6 +1,5 @@
 package hep.dataforge.vision.solid
 
-import hep.dataforge.meta.Meta
 import hep.dataforge.meta.update
 import hep.dataforge.names.NameToken
 import hep.dataforge.vision.*
@@ -39,18 +38,20 @@ public inline fun VisionContainerBuilder<Solid>.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 {
+    return Composite(type, children[0], children[1]).also { composite ->
-        it.configure { update(group.properties ?: Meta.EMPTY) }
+        composite.configure {
+            update(group.meta)
+        }
         if (group.position != null) {
-            it.position = group.position
+            composite.position = group.position
         }
         if (group.rotation != null) {
-            it.rotation = group.rotation
+            composite.rotation = group.rotation
         }
         if (group.scale != null) {
-            it.scale = group.scale
+            composite.scale = group.scale
         }
-        set(name, it)
+        set(name, composite)
     }
 }
 

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

@@ -85,7 +85,7 @@ public interface Solid : Vision {
             if (first.position != second.position) return false
             if (first.rotation != second.rotation) return false
             if (first.scale != second.scale) return false
-            if (first.properties != second.properties) return false
+            if (first.meta != second.meta) return false
             return true
         }
 

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

@@ -106,16 +106,16 @@ internal class Prototypes(
         }
     }
 
-    override fun getOwnProperty(name: Name): MetaItem<*>? = null
+    override fun getOwnProperty(name: Name): MetaItem? = null
 
     override fun getProperty(
         name: Name,
         inherit: Boolean,
         includeStyles: Boolean,
         includeDefaults: Boolean,
-    ): MetaItem<*>? = null
+    ): MetaItem? = null
 
-    override fun setProperty(name: Name, item: MetaItem<*>?, notify: Boolean) {
+    override fun setProperty(name: Name, item: MetaItem?, notify: Boolean) {
         error("Can't ser property of prototypes container")
     }
 

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

@@ -19,12 +19,12 @@ public class SolidMaterial : Scheme() {
     /**
      * Primary web-color for the material
      */
-    public var color: ColorAccessor = ColorAccessor(config, COLOR_KEY)
+    public var color: ColorAccessor = ColorAccessor(items, COLOR_KEY)
 
     /**
      * Specular color for phong material
      */
-    public var specularColor: ColorAccessor = ColorAccessor(config, SPECULAR_COLOR_KEY)
+    public var specularColor: ColorAccessor = ColorAccessor(items, SPECULAR_COLOR_KEY)
 
     /**
      * Opacity
@@ -100,16 +100,17 @@ public val Solid.color: ColorAccessor
 
 public var Solid.material: SolidMaterial?
     get() = getProperty(MATERIAL_KEY, inherit = true).node?.let { SolidMaterial.read(it) }
-    set(value) = setProperty(MATERIAL_KEY, value?.config)
+    set(value) = setProperty(MATERIAL_KEY, value?.rootNode)
 
 @VisionBuilder
 public fun Solid.material(builder: SolidMaterial.() -> Unit) {
-    val node = allProperties(inherit = true).getItem(MATERIAL_KEY).node
-    if (node != null) {
-        SolidMaterial.update(node, builder)
-    } else {
     setProperty(MATERIAL_KEY, SolidMaterial(builder))
-    }
+//    val node = getOwnProperty(MATERIAL_KEY).node
+//    if (node != null) {
+//        configure(SolidMaterial(builder).config)
+//    } else {
+//        setProperty(MATERIAL_KEY, SolidMaterial(builder))
+//    }
 }
 
 public var Solid.opacity: Number?

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

@@ -17,7 +17,7 @@ private fun SolidReference.getRefProperty(
     inherit: Boolean,
     includeStyles: Boolean,
     includeDefaults: Boolean,
-): MetaItem<*>? {
+): MetaItem? {
     return sequence {
         yield(getOwnProperty(name))
         if (includeStyles) {
@@ -59,11 +59,11 @@ public class SolidReferenceGroup(
     private fun childPropertyName(childName: Name, propertyName: Name): Name =
         childToken(childName) + propertyName
 
-    private fun getChildProperty(childName: Name, propertyName: Name): MetaItem<*>? {
+    private fun getChildProperty(childName: Name, propertyName: Name): MetaItem? {
         return getOwnProperty(childPropertyName(childName, propertyName))
     }
 
-    private fun setChildProperty(childName: Name, propertyName: Name, item: MetaItem<*>?, notify: Boolean) {
+    private fun setChildProperty(childName: Name, propertyName: Name, item: MetaItem?, notify: Boolean) {
         setProperty(childPropertyName(childName, propertyName), item, notify)
     }
 
@@ -79,7 +79,7 @@ public class SolidReferenceGroup(
         inherit: Boolean,
         includeStyles: Boolean,
         includeDefaults: Boolean,
-    ): MetaItem<*>? = getRefProperty(name, inherit, includeStyles, includeDefaults)
+    ): MetaItem? = getRefProperty(name, inherit, includeStyles, includeDefaults)
 
     override val descriptor: NodeDescriptor get() = prototype.descriptor
 
@@ -99,9 +99,11 @@ public class SolidReferenceGroup(
                     ReferenceChild(childName + key.asName())
                 } ?: emptyMap()
 
-        override fun getOwnProperty(name: Name): MetaItem<*>? = getChildProperty(childName, name)
+        override val meta: Meta get() =TODO()// getChildProperty(childName, Name.EMPTY).node ?: Meta.EMPTY
 
-        override fun setProperty(name: Name, item: MetaItem<*>?, notify: Boolean) {
+        override fun getOwnProperty(name: Name): MetaItem? = getChildProperty(childName, name)
+
+        override fun setProperty(name: Name, item: MetaItem?, notify: Boolean) {
             setChildProperty(childName, name, item, notify)
         }
 
@@ -110,7 +112,7 @@ public class SolidReferenceGroup(
             inherit: Boolean,
             includeStyles: Boolean,
             includeDefaults: Boolean,
-        ): MetaItem<*>? = getRefProperty(name, inherit, includeStyles, includeDefaults)
+        ): MetaItem? = getRefProperty(name, inherit, includeStyles, includeDefaults)
 
         override var parent: VisionGroup?
             get() {

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

@@ -3,7 +3,7 @@ package hep.dataforge.vision.solid.specifications
 import hep.dataforge.meta.*
 
 public class Axes : Scheme() {
-    public var visible: Boolean by boolean(!config.isEmpty())
+    public var visible: Boolean by boolean(rootNode?.isEmpty() != false)
     public var size: Double by double(AXIS_SIZE)
     public var width: Double by double(AXIS_WIDTH)
 

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

@@ -9,7 +9,7 @@ import hep.dataforge.vision.solid.*
 internal fun mergeChild(parent: VisionGroup, child: Vision): Vision {
     return child.apply {
 
-        configure(parent.properties)
+        configure(parent.meta)
 
         //parent.properties?.let { config.update(it) }
 

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

@@ -28,7 +28,7 @@ class ConvexTest {
         val json = SolidManager.jsonForSolids.encodeToJsonElement(Convex.serializer(), convex)
         val meta = json.toMetaItem().node!!
 
-        val points = meta.getIndexed("points").values.map { (it as MetaItem.NodeItem<*>).node.point3D() }
+        val points = meta.getIndexed("points").values.map { (it as NodeItem<*>).node.point3D() }
         assertEquals(8, points.count())
 
         assertEquals(8, convex.points.size)

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

@@ -4,7 +4,6 @@ import hep.dataforge.names.Name
 import hep.dataforge.names.toName
 import hep.dataforge.vision.MutableVisionGroup
 import hep.dataforge.vision.get
-import hep.dataforge.vision.properties
 import kotlin.test.Test
 import kotlin.test.assertEquals
 
@@ -33,7 +32,7 @@ class SerializationTest {
         val string =  SolidManager.encodeToString(cube)
         println(string)
         val newCube = SolidManager.decodeFromString(string)
-        assertEquals(cube.properties, newCube.properties)
+        assertEquals(cube.meta, newCube.meta)
     }
 
     @Test
@@ -54,7 +53,7 @@ class SerializationTest {
         val string = SolidManager.encodeToString(group)
         println(string)
         val reconstructed = SolidManager.decodeFromString(string) as SolidGroup
-        assertEquals(group["cube"]?.properties, reconstructed["cube"]?.properties)
+        assertEquals(group["cube"]?.meta, reconstructed["cube"]?.meta)
     }
 
 }

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

@@ -1,6 +1,6 @@
 package hep.dataforge.vision.solid.three
 
-import hep.dataforge.meta.getItem
+import hep.dataforge.meta.get
 import hep.dataforge.meta.string
 import hep.dataforge.names.Name
 import hep.dataforge.names.plus
@@ -177,7 +177,7 @@ public class ThreeCanvas(
     }
 
     private fun addControls(element: Node, controls: Controls) {
-        when (controls.getItem("type").string) {
+        when (controls.get("type").string) {
             "trackball" -> TrackballControls(camera, element)
             else -> OrbitControls(camera, element)
         }

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

@@ -109,15 +109,15 @@ public object ThreeMaterials {
 /**
  * Infer color based on meta item
  */
-public fun MetaItem<*>.getColor(): Color {
+public fun MetaItem.getColor(): Color {
     return when (this) {
-        is MetaItem.ValueItem -> if (this.value.type == ValueType.NUMBER) {
+        is ValueItem -> if (this.value.type == ValueType.NUMBER) {
             val int = value.int
             Color(int)
         } else {
             Color(this.value.string)
         }
-        is MetaItem.NodeItem -> {
+        is NodeItem -> {
             Color(
                 node[Colors.RED_KEY]?.int ?: 0,
                 node[Colors.GREEN_KEY]?.int ?: 0,
@@ -160,7 +160,7 @@ public fun Mesh.updateMaterial(vision: Vision) {
 }
 
 public fun Mesh.updateMaterialProperty(vision: Vision, propertyName: Name) {
-    if (material.cached) {
+    if (material.cached || propertyName == SolidMaterial.MATERIAL_KEY) {
         //generate a new material since cached material should not be changed
         updateMaterial(vision)
     } else {

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

@@ -17,7 +17,7 @@ import kotlin.math.PI
 
 public val Solid.euler: Euler get() = Euler(rotationX, rotationY, rotationZ, rotationOrder.name)
 
-public val MetaItem<*>.vector: Vector3 get() = Vector3(node["x"].float ?: 0f, node["y"].float ?: 0f, node["z"].float ?: 0f)
+public val MetaItem.vector: Vector3 get() = Vector3(node["x"].float ?: 0f, node["y"].float ?: 0f, node["z"].float ?: 0f)
 
 public fun Geometry.toBufferGeometry(): BufferGeometry = BufferGeometry().apply { fromGeometry(this@toBufferGeometry) }