demo/gdml/build.gradle.kts

@@ -1,6 +1,5 @@
 import scientifik.DependencyConfiguration
 import scientifik.FXModule
-import scientifik.useFx
 
 plugins {
     id("scientifik.mpp")
@@ -37,7 +36,7 @@ kotlin {
 }
 
 application {
-    mainClassName = "hep.dataforge.vision.gdml.demo.GDMLDemoAppKt"
+    mainClassName = "hep.dataforge.vision.gdml.demo.GdmlFxDemoAppKt"
 }
 
 val convertGdmlToJson by tasks.creating(JavaExec::class) {

demo/gdml/src/jsMain/kotlin/hep/dataforge/vision/gdml/demo/GDMLAppComponent.kt

@@ -1,6 +1,7 @@
 package hep.dataforge.vision.gdml.demo
 
 import hep.dataforge.context.Context
+import hep.dataforge.meta.set
 import hep.dataforge.names.Name
 import hep.dataforge.names.isEmpty
 import hep.dataforge.vision.Vision
@@ -8,7 +9,6 @@ import hep.dataforge.vision.VisionGroup
 import hep.dataforge.vision.bootstrap.*
 import hep.dataforge.vision.gdml.toVision
 import hep.dataforge.vision.react.component
-import hep.dataforge.vision.react.flexColumn
 import hep.dataforge.vision.react.objectTree
 import hep.dataforge.vision.react.state
 import hep.dataforge.vision.solid.Solid
@@ -29,7 +29,6 @@ import react.dom.h1
 import scientifik.gdml.GDML
 import scientifik.gdml.parse
 import styled.css
-import styled.styledDiv
 import kotlin.browser.window
 import kotlin.math.PI
 
@@ -50,14 +49,14 @@ private val canvasConfig = Canvas3DOptions {
 val GDMLApp = component<GDMLAppProps> { props ->
     var selected by state { props.selected }
     var canvas: ThreeCanvas? by state { null }
-    var visual: Vision? by state { props.rootObject }
+    var vision: Vision? by state { props.rootObject }
 
     val select: (Name?) -> Unit = {
         selected = it
     }
 
     fun loadData(name: String, data: String) {
-        visual = when {
+        val parsedVision = when {
             name.endsWith(".gdml") || name.endsWith(".xml") -> {
                 val gdml = GDML.parse(data)
                 gdml.toVision(gdmlConfiguration)
@@ -68,20 +67,26 @@ val GDMLApp = component<GDMLAppProps> { props ->
                 error("File extension is not recognized: $name")
             }
         }
+        parsedVision.config["edges.enabled"] = false
+
+        vision = parsedVision
     }
 
-    flexColumn {
+    gridColumn {
         css {
             flex(1.0, 1.0, FlexBasis.auto)
         }
         h1 { +"GDML/JSON loader demo" }
-        styledDiv {
+        gridRow {
             css {
-                classes.add("row")
+                +"p-1"
-                classes.add("p-1")
                 overflow = Overflow.auto
             }
-            gridColumn(3, maxSize = GridMaxSize.XL, classes = "order-2 order-xl-1") {
+            gridColumn(3, maxSize = GridMaxSize.XL) {
+                css {
+                    +"order-2"
+                    +"order-xl-1"
+                }
                 card("Load data") {
                     fileDrop("(drag file here)") { files ->
                         val file = files?.get(0)
@@ -99,15 +104,19 @@ val GDMLApp = component<GDMLAppProps> { props ->
                 }
                 //tree
                 card("Object tree") {
-                    visual?.let {
+                    vision?.let {
                         objectTree(it, selected, select)
                     }
                 }
             }
 
-            gridColumn(6, maxSize = GridMaxSize.XL, classes = "order-1 order-xl-2") {
+            gridColumn(6, maxSize = GridMaxSize.XL) {
+                css {
+                    +"order-1"
+                    +"order-xl-2"
+                }
                 //canvas
-                (visual as? Solid)?.let { visual3D ->
+                (vision as? Solid)?.let { visual3D ->
                     child(ThreeCanvasComponent::class) {
                         attrs {
                             this.context = props.context
@@ -121,7 +130,10 @@ val GDMLApp = component<GDMLAppProps> { props ->
                     }
                 }
             }
-            gridColumn(3, maxSize = GridMaxSize.XL, classes = "order-3") {
+            gridColumn(3, maxSize = GridMaxSize.XL) {
+                css {
+                    +"order-3"
+                }
                 container {
                     //settings
                     canvas?.let {
@@ -136,8 +148,8 @@ val GDMLApp = component<GDMLAppProps> { props ->
                     selected.let { selected ->
                         val selectedObject: Vision? = when {
                             selected == null -> null
-                            selected.isEmpty() -> visual
+                            selected.isEmpty() -> vision
-                            else -> (visual as? VisionGroup)?.get(selected)
+                            else -> (vision as? VisionGroup)?.get(selected)
                         }
                         if (selectedObject != null) {
                             visionPropertyEditor(

demo/gdml/src/jsMain/kotlin/hep/dataforge/vision/gdml/demo/GdmlJsDemoApp.kt

@@ -16,23 +16,9 @@ import kotlin.browser.document
 
 val gdmlConfiguration: GDMLTransformer.() -> Unit = {
     lUnit = LUnit.CM
-    volumeAction = { volume ->
-        when {
-            volume.name.startsWith("ecal01lay") -> GDMLTransformer.Action.REJECT
-            volume.name.startsWith("UPBL") -> GDMLTransformer.Action.REJECT
-            volume.name.startsWith("USCL") -> GDMLTransformer.Action.REJECT
-            volume.name.startsWith("VPBL") -> GDMLTransformer.Action.REJECT
-            volume.name.startsWith("VSCL") -> GDMLTransformer.Action.REJECT
-            else -> GDMLTransformer.Action.CACHE
-        }
-    }
 
-    solidConfiguration = { parent, solid ->
+    solidConfiguration = { parent, _ ->
-        if (
+        if (parent.physVolumes.isNotEmpty()) {
-            solid.name.startsWith("Yoke")
-            || solid.name.startsWith("Pole")
-            || parent.physVolumes.isNotEmpty()
-        ) {
             useStyle("opaque") {
                 MATERIAL_OPACITY_KEY put 0.3
             }
@@ -64,19 +50,6 @@ private class GDMLDemoApp : Application {
                 }
             }
         }
-//        (document.getElementById("file_load_button") as? HTMLInputElement)?.apply {
-//            addEventListener("change", {
-//                (it.target as HTMLInputElement).files?.asList()?.first()?.let { file ->
-//                    FileReader().apply {
-//                        onload = {
-//                            val string = result as String
-//                            action(file.name, string)
-//                        }
-//                        readAsText(file)
-//                    }
-//                }
-//            }, false)
-//        }
 
     }
 }

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

@@ -36,12 +36,11 @@ class GDMLView : View() {
             buttonbar {
                 button("Load GDML/json") {
                     action {
-                        runAsync {
+                        val file = chooseFile("Select a GDML/json file", filters = fileNameFilter).firstOrNull()
-                            val file = chooseFile("Select a GDML/json file", filters = fileNameFilter).firstOrNull()
+                        if(file!= null) {
-                                ?: return@runAsync null
+                            runAsync {
-                            SolidManager.readFile(file)
+                                SolidManager.readFile(file)
-                        } ui {
+                            } ui {
-                            if (it != null) {
                                 canvas.render(it)
                             }
                         }

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

@@ -71,7 +71,7 @@ private object VariableBoxThreeFactory : ThreeFactory<Solid> {
         //JS sometimes tries to pass Geometry as BufferGeometry
         @Suppress("USELESS_IS_CHECK") if (geometry !is BufferGeometry) error("BufferGeometry expected")
 
-        val mesh = Mesh(geometry, getMaterial(obj)).apply {
+        val mesh = Mesh(geometry, getMaterial(obj,true)).apply {
             applyEdges(obj)
             applyWireFrame(obj)
 

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.5.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.6-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

gradlew.bat

@@ -40,7 +40,7 @@ if defined JAVA_HOME goto findJavaFromJavaHome
 
 set JAVA_EXE=java.exe
 %JAVA_EXE% -version >NUL 2>&1
-if "%ERRORLEVEL%" == "0" goto init
+if "%ERRORLEVEL%" == "0" goto execute
 
 echo.
 echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
@@ -54,7 +54,7 @@ goto fail
 set JAVA_HOME=%JAVA_HOME:"=%
 set JAVA_EXE=%JAVA_HOME%/bin/java.exe
 
-if exist "%JAVA_EXE%" goto init
+if exist "%JAVA_EXE%" goto execute
 
 echo.
 echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
@@ -64,21 +64,6 @@ echo location of your Java installation.
 
 goto fail
 
-:init
-@rem Get command-line arguments, handling Windows variants
-
-if not "%OS%" == "Windows_NT" goto win9xME_args
-
-:win9xME_args
-@rem Slurp the command line arguments.
-set CMD_LINE_ARGS=
-set _SKIP=2
-
-:win9xME_args_slurp
-if "x%~1" == "x" goto execute
-
-set CMD_LINE_ARGS=%*
-
 :execute
 @rem Setup the command line
 
@@ -86,7 +71,7 @@ set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
 
 
 @rem Execute Gradle
-"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
 
 :end
 @rem End local scope for the variables with windows NT shell

ui/bootstrap/src/main/kotlin/hep/dataforge/vision/bootstrap/bootstrap.kt

@@ -13,6 +13,9 @@ import react.RBuilder
 import react.ReactElement
 import react.child
 import react.dom.*
+import styled.StyledDOMBuilder
+import styled.css
+import styled.styledDiv
 
 inline fun TagConsumer<HTMLElement>.card(title: String, crossinline block: TagConsumer<HTMLElement>.() -> Unit) {
     div("card w-100") {
@@ -180,10 +183,14 @@ enum class ContainerSize(val suffix: String) {
 }
 
 inline fun RBuilder.container(
-    classes: String? = null,
     size: ContainerSize = ContainerSize.FLUID,
-    block: RDOMBuilder<DIV>.() -> Unit
+    block: StyledDOMBuilder<DIV>.() -> Unit
-): ReactElement = div(joinStyles(classes, "container${size.suffix}"), block)
+): ReactElement = styledDiv{
+    css{
+        classes.add("container${size.suffix}")
+    }
+    block()
+}
 
 
 enum class GridMaxSize(val suffix: String) {
@@ -196,19 +203,23 @@ enum class GridMaxSize(val suffix: String) {
 
 inline fun RBuilder.gridColumn(
     weight: Int? = null,
-    classes: String? = null,
     maxSize: GridMaxSize = GridMaxSize.NONE,
-    block: RDOMBuilder<DIV>.() -> Unit
+    block: StyledDOMBuilder<DIV>.() -> Unit
-): ReactElement {
+): ReactElement = styledDiv {
     val weightSuffix = weight?.let { "-$it" } ?: ""
-    return div(joinStyles(classes, "col${maxSize.suffix}$weightSuffix"), block)
+    css {
+        classes.add("col${maxSize.suffix}$weightSuffix")
+    }
+    block()
 }
 
 inline fun RBuilder.gridRow(
-    classes: String? = null,
+    block: StyledDOMBuilder<DIV>.() -> Unit
-    block: RDOMBuilder<DIV>.() -> Unit
+): ReactElement = styledDiv{
-): ReactElement {
+    css{
-    return div(joinStyles(classes, "row"), block)
+        classes.add("row")
+    }
+    block()
 }
 
 fun Element.renderObjectTree(

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

@@ -91,8 +91,7 @@ interface MutableVisionGroup : VisionGroup {
 
 operator fun VisionGroup.get(str: String?): Vision? = get(str?.toName() ?: Name.EMPTY)
 
-operator fun MutableVisionGroup.set(key: String, child: Vision?) {
+operator fun MutableVisionGroup.set(token: NameToken, child: Vision?): Unit = set(token.asName(), child)
-    set(key.toName(), child)
+operator fun MutableVisionGroup.set(key: String, child: Vision?): Unit = set(key.toName(), child)
-}
 
 fun MutableVisionGroup.removeAll() = children.keys.map { it.asName() }.forEach { this[it] = null }

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

@@ -0,0 +1,35 @@
+package hep.dataforge.vision.visitor
+
+import hep.dataforge.names.Name
+import hep.dataforge.vision.Vision
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.channels.awaitClose
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.callbackFlow
+import kotlin.reflect.KClass
+
+
+@OptIn(ExperimentalCoroutinesApi::class)
+suspend fun <T> Vision.flowStatistics(statistics: (Name, Vision) -> T): Flow<T> = callbackFlow<T> {
+    val visitor = object : VisionVisitor {
+        override suspend fun visit(name: Name, vision: Vision){
+            send(statistics(name, vision))
+        }
+    }
+    val job: Job = VisionVisitor.visitTree(visitor, this, this@flowStatistics)
+    job.invokeOnCompletion {
+        channel.close()
+    }
+    awaitClose {
+        job.cancel()
+    }
+}
+
+data class DefaultVisionStatistics(val name: Name, val type: KClass<out Vision>) {
+    val depth get() = name.length
+}
+
+suspend fun Vision.flowStatistics(): Flow<DefaultVisionStatistics> = flowStatistics { name, vision ->
+    DefaultVisionStatistics(name, vision::class)
+}

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

@@ -0,0 +1,55 @@
+package hep.dataforge.vision.visitor
+
+import hep.dataforge.names.Name
+import hep.dataforge.names.plus
+import hep.dataforge.vision.Vision
+import hep.dataforge.vision.VisionGroup
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.launch
+
+interface VisionVisitor {
+    /**
+     * Visit a vision possibly mutating in in the process. Should not rearrange children.
+     * @param name full name of a [Vision] being visited
+     * @param vision the visited [Vision]
+     */
+    suspend fun visit(name: Name, vision: Vision)
+
+    /**
+     * Rearrange children of given group
+     */
+    suspend fun visitChildren(name: Name, group: VisionGroup) {
+        //Do nothing by default
+    }
+
+    fun skip(name: Name, vision: Vision): Boolean = false
+
+    companion object{
+        private fun CoroutineScope.visitTreeAsync(
+            visionVisitor: VisionVisitor,
+            name: Name,
+            vision: Vision
+        ): Job = launch {
+            if (visionVisitor.skip(name, vision)) return@launch
+            visionVisitor.visit(name, vision)
+
+            if (vision is VisionGroup) {
+                visionVisitor.visitChildren(name, vision)
+
+                for ((token, child) in vision.children) {
+                    visitTreeAsync(visionVisitor, name + token, child)
+                }
+            }
+        }
+
+        /**
+         * Recursively visit this [Vision] and all children
+         */
+        fun visitTree(visionVisitor: VisionVisitor, scope: CoroutineScope, root: Vision): Job =
+            scope.visitTreeAsync(visionVisitor, Name.EMPTY, root)
+
+
+    }
+}
+

visionforge-core/src/jvmMain/kotlin/hep/dataforge/vision/visitor/countDistinct.kt

@@ -0,0 +1,16 @@
+package hep.dataforge.vision.visitor
+
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.collect
+import java.util.concurrent.atomic.AtomicInteger
+
+suspend fun <T, K> Flow<T>.countDistinctBy(selector: (T) -> K): Map<K, Int> {
+    val counter = LinkedHashMap<K, AtomicInteger>()
+    collect {
+        val key = selector(it)
+        counter.getOrPut(key) { AtomicInteger() }.incrementAndGet()
+    }
+    return counter.mapValues { it.value.toInt() }
+}
+
+suspend fun <T> Flow<T>.countDistinct(): Map<T, Int> = countDistinctBy { it }

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

@@ -4,11 +4,16 @@ import hep.dataforge.meta.Meta
 import hep.dataforge.meta.MetaBuilder
 import hep.dataforge.names.Name
 import hep.dataforge.names.asName
+import hep.dataforge.names.plus
 import hep.dataforge.names.toName
+import hep.dataforge.vision.get
+import hep.dataforge.vision.set
 import hep.dataforge.vision.solid.*
 import hep.dataforge.vision.solid.SolidMaterial.Companion.MATERIAL_COLOR_KEY
 import hep.dataforge.vision.useStyle
 import scientifik.gdml.*
+import kotlin.math.cos
+import kotlin.math.sin
 import kotlin.random.Random
 
 class GDMLTransformer(val root: GDML) {
@@ -21,17 +26,16 @@ class GDMLTransformer(val root: GDML) {
         CACHE
     }
 
-    /**
-     * A special group for local templates
-     */
-    val proto by lazy { SolidGroup() }
-    private val styleCache = HashMap<Name, Meta>()
-
     var lUnit: LUnit = LUnit.MM
 
     var solidAction: (GDMLSolid) -> Action = { Action.CACHE }
     var volumeAction: (GDMLGroup) -> Action = { Action.CACHE }
 
+    /**
+     * A special group for local templates
+     */
+    internal val proto by lazy { SolidGroup() }
+    private val styleCache = HashMap<Name, Meta>()
 
     var solidConfiguration: Solid.(parent: GDMLVolume, solid: GDMLSolid) -> Unit = { parent, _ ->
         lUnit = LUnit.CM
@@ -87,3 +91,274 @@ class GDMLTransformer(val root: GDML) {
     }
 
 }
+
+private fun Solid.withPosition(
+    lUnit: LUnit,
+    newPos: GDMLPosition? = null,
+    newRotation: GDMLRotation? = null,
+    newScale: GDMLScale? = null
+): Solid = apply {
+    newPos?.let {
+        val point = Point3D(it.x(lUnit), it.y(lUnit), it.z(lUnit))
+        if (position != null || point != World.ZERO) {
+            position = point
+        }
+    }
+    newRotation?.let {
+        val point = Point3D(it.x(), it.y(), it.z())
+        if (rotation != null || point != World.ZERO) {
+            rotation = point
+        }
+        //this@withPosition.rotationOrder = RotationOrder.ZXY
+    }
+    newScale?.let {
+        val point = Point3D(it.x, it.y, it.z)
+        if (scale != null || point != World.ONE) {
+            scale = point
+        }
+    }
+    //TODO convert units if needed
+}
+
+@Suppress("NOTHING_TO_INLINE")
+private inline operator fun Number.times(d: Double) = toDouble() * d
+
+@Suppress("NOTHING_TO_INLINE")
+private inline operator fun Number.times(f: Float) = toFloat() * f
+
+private fun SolidGroup.addSolid(
+    context: GDMLTransformer,
+    solid: GDMLSolid,
+    name: String = "",
+    block: Solid.() -> Unit = {}
+): Solid {
+    //context.solidAdded(solid)
+    val lScale = solid.lscale(context.lUnit)
+    val aScale = solid.ascale()
+    return when (solid) {
+        is GDMLBox -> box(solid.x * lScale, solid.y * lScale, solid.z * lScale, name)
+        is GDMLTube -> tube(
+            solid.rmax * lScale,
+            solid.z * lScale,
+            solid.rmin * lScale,
+            solid.startphi * aScale,
+            solid.deltaphi * aScale,
+            name
+        )
+        is GDMLCone -> cone(solid.rmax1, solid.z, solid.rmax2, name = name) {
+            require(solid.rmin1 == 0.0) { "Empty cones are not supported" }
+            require(solid.rmin2 == 0.0) { "Empty cones are not supported" }
+            startAngle = solid.startphi.toFloat()
+            angle = solid.deltaphi.toFloat()
+        }
+        is GDMLXtru -> extrude(name) {
+            shape {
+                solid.vertices.forEach {
+                    point(it.x * lScale, it.y * lScale)
+                }
+            }
+            solid.sections.sortedBy { it.zOrder }.forEach { section ->
+                layer(
+                    section.zPosition * lScale,
+                    section.xOffset * lScale,
+                    section.yOffset * lScale,
+                    section.scalingFactor
+                )
+            }
+        }
+        is GDMLScaledSolid -> {
+            //Add solid with modified scale
+            val innerSolid = solid.solidref.resolve(context.root)
+                ?: error("Solid with tag ${solid.solidref.ref} for scaled solid ${solid.name} not defined")
+
+            addSolid(context, innerSolid, name) {
+                block()
+                scaleX *= solid.scale.x.toFloat()
+                scaleY *= solid.scale.y.toFloat()
+                scaleZ = solid.scale.z.toFloat()
+            }
+        }
+        is GDMLSphere -> sphere(solid.rmax * lScale, solid.deltaphi * aScale, solid.deltatheta * aScale, name) {
+            phiStart = solid.startphi * aScale
+            thetaStart = solid.starttheta * aScale
+        }
+        is GDMLOrb -> sphere(solid.r * lScale, name = name)
+        is GDMLPolyhedra -> extrude(name) {
+            //getting the radius of first
+            require(solid.planes.size > 1) { "The polyhedron geometry requires at least two planes" }
+            val baseRadius = solid.planes.first().rmax * lScale
+            shape {
+                (0..solid.numsides).forEach {
+                    val phi = solid.deltaphi * aScale / solid.numsides * it + solid.startphi * aScale
+                    (baseRadius * cos(phi) to baseRadius * sin(phi))
+                }
+            }
+            solid.planes.forEach { plane ->
+                //scaling all radii relative to first layer radius
+                layer(plane.z * lScale, scale = plane.rmax * lScale / baseRadius)
+            }
+        }
+        is GDMLBoolSolid -> {
+            val first = solid.first.resolve(context.root) ?: error("")
+            val second = solid.second.resolve(context.root) ?: error("")
+            val type: CompositeType = when (solid) {
+                is GDMLUnion -> CompositeType.UNION
+                is GDMLSubtraction -> CompositeType.SUBTRACT
+                is GDMLIntersection -> CompositeType.INTERSECT
+            }
+
+            return composite(type, name) {
+                addSolid(context, first) {
+                    withPosition(
+                        context.lUnit,
+                        solid.resolveFirstPosition(context.root),
+                        solid.resolveFirstRotation(context.root),
+                        null
+                    )
+                }
+                addSolid(context, second) {
+                    withPosition(
+                        context.lUnit,
+                        solid.resolvePosition(context.root),
+                        solid.resolveRotation(context.root),
+                        null
+                    )
+                }
+            }
+        }
+        else -> error("Renderer for $solid not supported yet")
+    }.apply(block)
+}
+
+
+private fun SolidGroup.addSolidWithCaching(
+    context: GDMLTransformer,
+    solid: GDMLSolid,
+    volume: GDMLVolume,
+    name: String = solid.name
+) {
+    when (context.solidAction(solid)) {
+        GDMLTransformer.Action.ACCEPT -> {
+            addSolid(context, solid, name) {
+                context.configureSolid(this, volume, solid)
+            }
+        }
+        GDMLTransformer.Action.CACHE -> {
+            if (context.proto[solid.name] == null) {
+                context.proto.addSolid(context, solid, name) {
+                    context.configureSolid(this, volume, solid)
+                }
+            }
+            ref(solid.name.asName(), name)
+        }
+        GDMLTransformer.Action.REJECT -> {
+            //ignore
+        }
+    }
+
+}
+
+private val volumesName = "volumes".asName()
+
+private fun SolidGroup.addPhysicalVolume(
+    context: GDMLTransformer,
+    physVolume: GDMLPhysVolume
+) {
+    val volume: GDMLGroup = physVolume.volumeref.resolve(context.root)
+        ?: error("Volume with ref ${physVolume.volumeref.ref} could not be resolved")
+
+    // a special case for single solid volume
+//    if (volume is GDMLVolume && volume.physVolumes.isEmpty() && volume.placement == null) {
+//        val solid = volume.solidref.resolve(context.root)
+//            ?: error("Solid with tag ${volume.solidref.ref} for volume ${volume.name} not defined")
+//        addSolidWithCaching(context, solid, volume, physVolume.name ?: "").apply {
+//            withPosition(
+//                context.lUnit,
+//                physVolume.resolvePosition(context.root),
+//                physVolume.resolveRotation(context.root),
+//                physVolume.resolveScale(context.root)
+//            )
+//        }
+//        return
+//    }
+
+    when (context.volumeAction(volume)) {
+        GDMLTransformer.Action.ACCEPT -> {
+            val group: SolidGroup = volume(context, volume)
+            this[physVolume.name ?: ""] = group.apply {
+                withPosition(
+                    context.lUnit,
+                    physVolume.resolvePosition(context.root),
+                    physVolume.resolveRotation(context.root),
+                    physVolume.resolveScale(context.root)
+                )
+            }
+        }
+        GDMLTransformer.Action.CACHE -> {
+            val fullName = volumesName + volume.name.asName()
+            if (context.proto[fullName] == null) {
+                context.proto[fullName] = volume(context, volume)
+            }
+
+            this[physVolume.name ?: ""] = Proxy(this, fullName).apply {
+                withPosition(
+                    context.lUnit,
+                    physVolume.resolvePosition(context.root),
+                    physVolume.resolveRotation(context.root),
+                    physVolume.resolveScale(context.root)
+                )
+            }
+        }
+        GDMLTransformer.Action.REJECT -> {
+            //ignore
+        }
+    }
+}
+
+private fun SolidGroup.addDivisionVolume(
+    context: GDMLTransformer,
+    divisionVolume: GDMLDivisionVolume
+) {
+    val volume: GDMLGroup = divisionVolume.volumeref.resolve(context.root)
+        ?: error("Volume with ref ${divisionVolume.volumeref.ref} could not be resolved")
+
+    //TODO add divisions
+    set(Name.EMPTY, volume(context, volume))
+}
+
+//private val solidsName = "solids".asName()
+
+private fun volume(
+    context: GDMLTransformer,
+    group: GDMLGroup
+): SolidGroup = SolidGroup().apply {
+    if (group is GDMLVolume) {
+        val solid: GDMLSolid = group.solidref.resolve(context.root)
+            ?: error("Solid with tag ${group.solidref.ref} for volume ${group.name} not defined")
+
+        addSolidWithCaching(context, solid, group)
+
+        when (val vol: GDMLPlacement? = group.placement) {
+            is GDMLPhysVolume -> addPhysicalVolume(context, vol)
+            is GDMLDivisionVolume -> addDivisionVolume(context, vol)
+        }
+    }
+
+    group.physVolumes.forEach { physVolume ->
+        addPhysicalVolume(context, physVolume)
+    }
+}
+
+fun GDML.toVision(block: GDMLTransformer.() -> Unit = {}): SolidGroup {
+    val context = GDMLTransformer(this).apply(block)
+    return context.finalize(volume(context, world))
+}
+
+/**
+ * Append gdml node to the group
+ */
+fun SolidGroup.gdml(gdml: GDML, key: String = "", transformer: GDMLTransformer.() -> Unit = {}) {
+    val visual = gdml.toVision(transformer)
+    //println(Visual3DPlugin.json.stringify(VisualGroup3D.serializer(), visual))
+    set(key, visual)
+}

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

@@ -0,0 +1,89 @@
+package hep.dataforge.vision.gdml
+
+import hep.dataforge.meta.DFExperimental
+import hep.dataforge.meta.sequence
+import hep.dataforge.meta.set
+import hep.dataforge.names.Name
+import hep.dataforge.names.toName
+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
+
+expect class Counter() {
+    fun get(): Int
+    fun incrementAndGet(): Int
+}
+
+@DFExperimental
+private class GdmlOptimizer() : VisionVisitor {
+    val logger = KotlinLogging.logger("SingleChildReducer")
+
+    private operator fun Point3D?.plus(other: Point3D?): Point3D? = if (this == null && other == null) {
+        null
+    } else {
+        (this ?: Point3D(0, 0, 0)) + (other ?: Point3D(0, 0, 0))
+    }
+
+    private fun Vision.updateFrom(other: Vision): Vision {
+        if (this is Solid && other is Solid) {
+            position += other.position
+            rotation += other.rotation
+            if (this.scale != null || other.scale != null) {
+                scaleX = scaleX.toDouble() * other.scaleX.toDouble()
+                scaleY = scaleY.toDouble() * other.scaleY.toDouble()
+                scaleZ = scaleZ.toDouble() * other.scaleZ.toDouble()
+            }
+            other.properties?.sequence()?.forEach { (name, item) ->
+                if (properties?.getItem(name) == null) {
+                    config[name] = item
+                }
+            }
+        }
+        return this
+    }
+
+    private val depthCount = HashMap<Int, Counter>()
+
+    override suspend fun visit(name: Name, vision: Vision) {
+        val depth = name.length
+        depthCount.getOrPut(depth) { Counter() }.incrementAndGet()
+    }
+
+    override fun skip(name: Name, vision: Vision): Boolean = vision is Proxy.ProxyChild
+
+    override suspend fun visitChildren(name: Name, group: VisionGroup) {
+        if (name == "volumes".toName()) return
+        if (group !is MutableVisionGroup) return
+
+        val newChildren = group.children.entries.associate { (visionToken, vision) ->
+            //Reduce single child groups
+            if (vision is VisionGroup && vision !is Proxy && vision.children.size == 1) {
+                val (token, child) = vision.children.entries.first()
+                child.parent = null
+                if (token != visionToken) {
+                    child.config["solidName"] = token.toString()
+                }
+                visionToken to child.updateFrom(vision)
+            } else {
+                visionToken to vision
+            }
+        }
+        if (newChildren != group.children) {
+            group.removeAll()
+            newChildren.forEach { (token, child) ->
+                group[token] = child
+            }
+        }
+    }
+}
+
+@DFExperimental
+suspend fun SolidGroup.optimizeGdml(): Job = coroutineScope {
+    prototypes?.let {
+        VisionVisitor.visitTree(GdmlOptimizer(), this, it)
+    } ?: CompletableDeferred(Unit)
+}

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

@@ -1,268 +0,0 @@
-package hep.dataforge.vision.gdml
-
-
-import hep.dataforge.names.Name
-import hep.dataforge.names.asName
-import hep.dataforge.names.plus
-import hep.dataforge.vision.get
-import hep.dataforge.vision.set
-import hep.dataforge.vision.solid.*
-import hep.dataforge.vision.solid.World.ONE
-import hep.dataforge.vision.solid.World.ZERO
-import scientifik.gdml.*
-import kotlin.math.cos
-import kotlin.math.sin
-
-
-private fun Solid.withPosition(
-    lUnit: LUnit,
-    newPos: GDMLPosition? = null,
-    newRotation: GDMLRotation? = null,
-    newScale: GDMLScale? = null
-): Solid = apply {
-    newPos?.let {
-        val point = Point3D(it.x(lUnit), it.y(lUnit), it.z(lUnit))
-        if (position != null || point != ZERO) {
-            position = point
-        }
-    }
-    newRotation?.let {
-        val point = Point3D(it.x(), it.y(), it.z())
-        if (rotation != null || point != ZERO) {
-            rotation = point
-        }
-        //this@withPosition.rotationOrder = RotationOrder.ZXY
-    }
-    newScale?.let {
-        val point = Point3D(it.x, it.y, it.z)
-        if (scale != null || point != ONE) {
-            scale = point
-        }
-    }
-    //TODO convert units if needed
-}
-
-@Suppress("NOTHING_TO_INLINE")
-private inline operator fun Number.times(d: Double) = toDouble() * d
-
-@Suppress("NOTHING_TO_INLINE")
-private inline operator fun Number.times(f: Float) = toFloat() * f
-
-private fun SolidGroup.addSolid(
-    context: GDMLTransformer,
-    solid: GDMLSolid,
-    name: String = "",
-    block: Solid.() -> Unit = {}
-): Solid {
-    //context.solidAdded(solid)
-    val lScale = solid.lscale(context.lUnit)
-    val aScale = solid.ascale()
-    return when (solid) {
-        is GDMLBox -> box(solid.x * lScale, solid.y * lScale, solid.z * lScale, name)
-        is GDMLTube -> tube(
-            solid.rmax * lScale,
-            solid.z * lScale,
-            solid.rmin * lScale,
-            solid.startphi * aScale,
-            solid.deltaphi * aScale,
-            name
-        )
-        is GDMLCone -> cone(solid.rmax1, solid.z, solid.rmax2, name = name) {
-            require(solid.rmin1 == 0.0) { "Empty cones are not supported" }
-            require(solid.rmin2 == 0.0) { "Empty cones are not supported" }
-            startAngle = solid.startphi.toFloat()
-            angle = solid.deltaphi.toFloat()
-        }
-        is GDMLXtru -> extrude(name) {
-            shape {
-                solid.vertices.forEach {
-                    point(it.x * lScale, it.y * lScale)
-                }
-            }
-            solid.sections.sortedBy { it.zOrder }.forEach { section ->
-                layer(
-                    section.zPosition * lScale,
-                    section.xOffset * lScale,
-                    section.yOffset * lScale,
-                    section.scalingFactor
-                )
-            }
-        }
-        is GDMLScaledSolid -> {
-            //Add solid with modified scale
-            val innerSolid = solid.solidref.resolve(context.root)
-                ?: error("Solid with tag ${solid.solidref.ref} for scaled solid ${solid.name} not defined")
-
-            addSolid(context, innerSolid, name) {
-                block()
-                scaleX *= solid.scale.x.toFloat()
-                scaleY *= solid.scale.y.toFloat()
-                scaleZ = solid.scale.z.toFloat()
-            }
-        }
-        is GDMLSphere -> sphere(solid.rmax * lScale, solid.deltaphi * aScale, solid.deltatheta * aScale, name) {
-            phiStart = solid.startphi * aScale
-            thetaStart = solid.starttheta * aScale
-        }
-        is GDMLOrb -> sphere(solid.r * lScale, name = name)
-        is GDMLPolyhedra -> extrude(name) {
-            //getting the radius of first
-            require(solid.planes.size > 1) { "The polyhedron geometry requires at least two planes" }
-            val baseRadius = solid.planes.first().rmax * lScale
-            shape {
-                (0..solid.numsides).forEach {
-                    val phi = solid.deltaphi * aScale / solid.numsides * it + solid.startphi * aScale
-                    (baseRadius * cos(phi) to baseRadius * sin(phi))
-                }
-            }
-            solid.planes.forEach { plane ->
-                //scaling all radii relative to first layer radius
-                layer(plane.z * lScale, scale = plane.rmax * lScale / baseRadius)
-            }
-        }
-        is GDMLBoolSolid -> {
-            val first = solid.first.resolve(context.root) ?: error("")
-            val second = solid.second.resolve(context.root) ?: error("")
-            val type: CompositeType = when (solid) {
-                is GDMLUnion -> CompositeType.UNION
-                is GDMLSubtraction -> CompositeType.SUBTRACT
-                is GDMLIntersection -> CompositeType.INTERSECT
-            }
-
-            return composite(type, name) {
-                addSolid(context, first) {
-                    withPosition(
-                        context.lUnit,
-                        solid.resolveFirstPosition(context.root),
-                        solid.resolveFirstRotation(context.root),
-                        null
-                    )
-                }
-                addSolid(context, second) {
-                    withPosition(
-                        context.lUnit,
-                        solid.resolvePosition(context.root),
-                        solid.resolveRotation(context.root),
-                        null
-                    )
-                }
-            }
-        }
-        else -> error("Renderer for $solid not supported yet")
-    }.apply(block)
-}
-
-private val volumesName = "volumes".asName()
-
-private fun SolidGroup.addPhysicalVolume(
-    context: GDMLTransformer,
-    physVolume: GDMLPhysVolume
-) {
-    val volume: GDMLGroup = physVolume.volumeref.resolve(context.root)
-        ?: error("Volume with ref ${physVolume.volumeref.ref} could not be resolved")
-
-    when (context.volumeAction(volume)) {
-        GDMLTransformer.Action.ACCEPT -> {
-            val group = volume(context, volume)
-            this[physVolume.name ?: ""] = group.apply {
-                withPosition(
-                    context.lUnit,
-                    physVolume.resolvePosition(context.root),
-                    physVolume.resolveRotation(context.root),
-                    physVolume.resolveScale(context.root)
-                )
-            }
-        }
-        GDMLTransformer.Action.CACHE -> {
-            val fullName = volumesName + volume.name.asName()
-            if (context.proto[fullName] == null) {
-                context.proto[fullName] = volume(context, volume)
-            }
-
-            this[physVolume.name ?: ""] = Proxy(this, fullName).apply {
-                withPosition(
-                    context.lUnit,
-                    physVolume.resolvePosition(context.root),
-                    physVolume.resolveRotation(context.root),
-                    physVolume.resolveScale(context.root)
-                )
-            }
-        }
-        GDMLTransformer.Action.REJECT -> {
-            //ignore
-        }
-    }
-}
-
-private fun SolidGroup.addDivisionVolume(
-    context: GDMLTransformer,
-    divisionVolume: GDMLDivisionVolume
-) {
-    val volume: GDMLGroup = divisionVolume.volumeref.resolve(context.root)
-        ?: error("Volume with ref ${divisionVolume.volumeref.ref} could not be resolved")
-
-    //TODO add divisions
-    set(
-        Name.EMPTY,
-        volume(
-            context,
-            volume
-        )
-    )
-}
-
-private val solidsName = "solids".asName()
-
-private fun volume(
-    context: GDMLTransformer,
-    group: GDMLGroup
-): SolidGroup {
-    return SolidGroup().apply {
-        if (group is GDMLVolume) {
-            val solid = group.solidref.resolve(context.root)
-                ?: error("Solid with tag ${group.solidref.ref} for volume ${group.name} not defined")
-
-            when (context.solidAction(solid)) {
-                GDMLTransformer.Action.ACCEPT -> {
-                    addSolid(context, solid, solid.name) {
-                        context.configureSolid(this, group, solid)
-                    }
-                }
-                GDMLTransformer.Action.CACHE -> {
-                    if (context.proto[solid.name] == null) {
-                        context.proto.addSolid(context, solid, solid.name) {
-                            context.configureSolid(this, group, solid)
-                        }
-                    }
-                    ref(solid.name.asName(), solid.name)
-                }
-                GDMLTransformer.Action.REJECT -> {
-                    //ignore
-                }
-            }
-
-            when (val vol = group.placement) {
-                is GDMLPhysVolume -> addPhysicalVolume(context, vol)
-                is GDMLDivisionVolume -> addDivisionVolume(context, vol)
-            }
-        }
-
-        group.physVolumes.forEach { physVolume ->
-            addPhysicalVolume(context, physVolume)
-        }
-    }
-}
-
-fun GDML.toVision(block: GDMLTransformer.() -> Unit = {}): SolidGroup {
-    val context = GDMLTransformer(this).apply(block)
-    return context.finalize(volume(context, world))
-}
-
-/**
- * Append gdml node to the group
- */
-fun SolidGroup.gdml(gdml: GDML, key: String = "", transformer: GDMLTransformer.() -> Unit = {}) {
-    val visual = gdml.toVision(transformer)
-    //println(Visual3DPlugin.json.stringify(VisualGroup3D.serializer(), visual))
-    set(key, visual)
-}

visionforge-gdml/src/jsMain/kotlin/hep/dataforge/vision/gdml/gdmlJs.kt

@@ -0,0 +1,8 @@
+package hep.dataforge.vision.gdml
+
+actual class Counter {
+    private var count: Int = 0
+    actual fun get(): Int = count
+
+    actual fun incrementAndGet(): Int = count++
+}

visionforge-gdml/src/jvmMain/kotlin/hep/dataforge/vision/gdml/gdmlJVM.kt

@@ -5,6 +5,9 @@ import nl.adaptivity.xmlutil.StAXReader
 import scientifik.gdml.GDML
 import java.nio.file.Files
 import java.nio.file.Path
+import java.util.concurrent.atomic.AtomicInteger
+
+actual typealias Counter = AtomicInteger
 
 fun GDML.Companion.readFile(file: Path): GDML {
     val xmlReader = StAXReader(Files.newInputStream(file), "UTF-8")
@@ -15,4 +18,3 @@ fun SolidGroup.gdml(file: Path, key: String = "", transformer: GDMLTransformer.(
     val gdml = GDML.readFile(file)
     gdml(gdml, key, transformer)
 }
-

visionforge-gdml/src/jvmTest/kotlin/hep/dataforge/vision/gdml/TestConvertor.kt

@@ -10,11 +10,10 @@ class TestConvertor {
     @Test
     fun testBMNGeometry() {
         val stream = javaClass.getResourceAsStream("/gdml/BM@N.gdml")
-
         val xmlReader = StAXReader(stream, "UTF-8")
         val xml = GDML.format.parse(GDML.serializer(), xmlReader)
-        val visual = xml.toVision()
+        val vision = xml.toVision()
-        println(visual.stringify())
+        println(vision.stringify())
     }
 
     @Test

visionforge-gdml/src/jvmTest/kotlin/hep/dataforge/vision/gdml/bmanStatistics.kt

@@ -0,0 +1,34 @@
+package hep.dataforge.vision.gdml
+
+import hep.dataforge.vision.visitor.countDistinctBy
+import hep.dataforge.vision.visitor.flowStatistics
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+import nl.adaptivity.xmlutil.StAXReader
+import scientifik.gdml.GDML
+import java.io.File
+
+suspend fun main() {
+    withContext(Dispatchers.Default) {
+        //val stream = SingleChildReducer::class.java.getResourceAsStream("/gdml/BM@N.gdml")
+        val stream =
+            File("D:\\Work\\Projects\\dataforge-vis\\visionforge-gdml\\src\\jvmTest\\resources\\gdml\\BM@N.gdml").inputStream()
+
+        val xmlReader = StAXReader(stream, "UTF-8")
+        val xml = GDML.format.parse(GDML.serializer(), xmlReader)
+        val vision = xml.toVision()
+
+
+        vision.flowStatistics().countDistinctBy { it.type }.forEach { (depth, size) ->
+            println("$depth\t$size")
+        }
+
+        println("***REDUCED***")
+
+        vision.optimizeGdml()
+
+        vision.flowStatistics().countDistinctBy { it.type }.forEach { (depth, size) ->
+            println("$depth\t$size")
+        }
+    }
+}

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

@@ -13,6 +13,9 @@ import kotlinx.serialization.Transient
 import kotlinx.serialization.UseSerializers
 import kotlin.collections.set
 
+
+class AbstractProxy
+
 /**
  * A proxy [Solid] to reuse a template object
  */
@@ -39,8 +42,7 @@ class Proxy private constructor(
         get() = (parent as? SolidGroup)?.getPrototype(templateName)
             ?: error("Prototype with name $templateName not found in $parent")
 
-    override val styleSheet: StyleSheet
+    override val styleSheet: StyleSheet get() = parent?.styleSheet ?: StyleSheet(this)
-        get() = parent?.styleSheet ?: StyleSheet(this)
 
     override fun getProperty(name: Name, inherit: Boolean): MetaItem<*>? {
         return if (inherit) {

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

@@ -103,9 +103,9 @@ interface Solid : Vision {
  * Count number of layers to the top object. Return 1 if this is top layer
  */
 var Solid.layer: Int
-    get() = getItem(LAYER_KEY).int ?: 0
+    get() = properties?.getItem(LAYER_KEY).int ?: 0
     set(value) {
-        setItem(LAYER_KEY, value.asValue())
+        config[LAYER_KEY] = value.asValue()
     }
 
 fun Renderer<Solid>.render(meta: Meta = Meta.EMPTY, action: SolidGroup.() -> Unit) =

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

@@ -35,7 +35,7 @@ abstract class MeshThreeFactory<in T : Solid>(
 
         //val meshMeta: Meta = obj.properties[Material3D.MATERIAL_KEY]?.node ?: Meta.empty
 
-        val mesh = Mesh(geometry, getMaterial(obj)).apply {
+        val mesh = Mesh(geometry, getMaterial(obj, true)).apply {
             matrixAutoUpdate = false
             applyEdges(obj)
             applyWireFrame(obj)
@@ -50,7 +50,7 @@ abstract class MeshThreeFactory<in T : Solid>(
         }
 
         //add listener to object properties
-        obj.onPropertyChange(this) { name->
+        obj.onPropertyChange(this) { name ->
             when {
                 name.startsWith(Solid.GEOMETRY_KEY) -> {
                     val oldGeometry = mesh.geometry as BufferGeometry
@@ -80,22 +80,28 @@ abstract class MeshThreeFactory<in T : Solid>(
 }
 
 fun Mesh.applyEdges(obj: Solid) {
-    children.find { it.name == "@edges" }?.let {
+    val edges = children.find { it.name == "@edges" } as? LineSegments
-        remove(it)
-        (it as LineSegments).dispose()
-    }
     //inherited edges definition, enabled by default
     if (obj.getItem(MeshThreeFactory.EDGES_ENABLED_KEY).boolean != false) {
-
+        val bufferGeometry = geometry as? BufferGeometry ?: return
-        val material = ThreeMaterials.getLineMaterial(obj.getItem(MeshThreeFactory.EDGES_MATERIAL_KEY).node)
+        val material = ThreeMaterials.getLineMaterial(obj.getItem(MeshThreeFactory.EDGES_MATERIAL_KEY).node, true)
-        add(
+        if (edges == null) {
-            LineSegments(
+            add(
-                EdgesGeometry(geometry as BufferGeometry),
+                LineSegments(
-                material
+                    EdgesGeometry(bufferGeometry),
-            ).apply {
+                    material
-                name = "@edges"
+                ).apply {
-            }
+                    name = "@edges"
-        )
+                }
+            )
+        } else {
+            edges.material = material
+        }
+    } else {
+        edges?.let {
+            remove(it)
+            it.dispose()
+        }
     }
 }
 
@@ -106,10 +112,11 @@ fun Mesh.applyWireFrame(obj: Solid) {
     }
     //inherited wireframe definition, disabled by default
     if (obj.getItem(MeshThreeFactory.WIREFRAME_ENABLED_KEY).boolean == true) {
-        val material = ThreeMaterials.getLineMaterial(obj.getItem(MeshThreeFactory.WIREFRAME_MATERIAL_KEY).node)
+        val bufferGeometry = geometry as? BufferGeometry ?: return
+        val material = ThreeMaterials.getLineMaterial(obj.getItem(MeshThreeFactory.WIREFRAME_MATERIAL_KEY).node, true)
         add(
             LineSegments(
-                WireframeGeometry(geometry as BufferGeometry),
+                WireframeGeometry(bufferGeometry),
                 material
             ).apply {
                 name = "@wireframe"

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

@@ -58,7 +58,7 @@ fun Object3D.updatePosition(obj: Vision) {
  */
 fun Object3D.updateProperty(source: Vision, propertyName: Name) {
     if (this is Mesh && propertyName.startsWith(MATERIAL_KEY)) {
-        this.material = getMaterial(source)
+        this.material = getMaterial(source, false)
     } else if (
         propertyName.startsWith(Solid.POSITION_KEY)
         || propertyName.startsWith(Solid.ROTATION)

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

@@ -21,7 +21,7 @@ object ThreeLabelFactory : ThreeFactory<SolidLabel> {
             height = 1
             curveSegments = 1
         })
-        return Mesh(textGeo, getMaterial(obj)).apply {
+        return Mesh(textGeo, getMaterial(obj,true)).apply {
             updatePosition(obj)
             obj.onPropertyChange(this@ThreeLabelFactory) { _ ->
                 //TODO

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

@@ -18,7 +18,7 @@ object ThreeLineFactory : ThreeFactory<PolyLine> {
             vertices = obj.points.toTypedArray()
         }
 
-        val material = ThreeMaterials.getLineMaterial(obj.getItem(MeshThreeFactory.EDGES_MATERIAL_KEY).node)
+        val material = ThreeMaterials.getLineMaterial(obj.getItem(MeshThreeFactory.EDGES_MATERIAL_KEY).node, true)
 
         material.linewidth = obj.thickness.toDouble()
         material.color = obj.color?.let { Color(it) } ?: DEFAULT_LINE_COLOR

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

@@ -33,18 +33,27 @@ object ThreeMaterials {
         linewidth = 8.0
     }
 
-    fun getLineMaterial(meta: Meta?): LineBasicMaterial {
+    private val lineMaterialCache = HashMap<Meta, LineBasicMaterial>()
+
+    private fun buildLineMaterial(meta: Meta): LineBasicMaterial = LineBasicMaterial().apply {
+        color = meta[SolidMaterial.COLOR_KEY]?.getColor() ?: DEFAULT_LINE_COLOR
+        opacity = meta[SolidMaterial.OPACITY_KEY].double ?: 1.0
+        transparent = opacity < 1.0
+        linewidth = meta["thickness"].double ?: 1.0
+    }
+
+    fun getLineMaterial(meta: Meta?, cache: Boolean): LineBasicMaterial {
         if (meta == null) return DEFAULT_LINE
-        return LineBasicMaterial().apply {
+        return if (cache) {
-            color = meta[SolidMaterial.COLOR_KEY]?.getColor() ?: DEFAULT_LINE_COLOR
+            lineMaterialCache.getOrPut(meta) { buildLineMaterial(meta) }
-            opacity = meta[SolidMaterial.OPACITY_KEY].double ?: 1.0
+        } else {
-            transparent = opacity < 1.0
+            buildLineMaterial(meta)
-            linewidth = meta["thickness"].double ?: 1.0
         }
     }
 
-    fun getMaterial(vision3D: Vision): Material {
+    private val materialCache = HashMap<Meta, Material>()
-        val meta = vision3D.getItem(SolidMaterial.MATERIAL_KEY).node ?: return DEFAULT
+
+    private fun buildMaterial(meta: Meta): Material {
         return if (meta[SolidMaterial.SPECULAR_COLOR_KEY] != null) {
             MeshPhongMaterial().apply {
                 color = meta[SolidMaterial.COLOR_KEY]?.getColor() ?: DEFAULT_COLOR
@@ -65,6 +74,15 @@ object ThreeMaterials {
         }
     }
 
+    fun getMaterial(vision3D: Vision, cache: Boolean): Material {
+        val meta = vision3D.getItem(SolidMaterial.MATERIAL_KEY).node ?: return DEFAULT
+        return if (cache) {
+            materialCache.getOrPut(meta) { buildMaterial(meta) }
+        } else {
+            buildMaterial(meta)
+        }
+    }
+
 }
 
 /**

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

@@ -70,7 +70,7 @@ class ThreePlugin : AbstractPlugin() {
 
                     obj.onChildrenChange(this) { name, child ->
                         if (name.isEmpty()) {
-                            logger.error { "Children change with empty namr on $group" }
+                            logger.error { "Children change with empty name on $group" }
                             return@onChildrenChange
                         }
 

visionforge-solid/src/jsMain/kotlin/hep/dataforge/vision/solid/three/ThreeProxyFactory.kt

@@ -4,12 +4,26 @@ import hep.dataforge.names.toName
 import hep.dataforge.vision.solid.Proxy
 import hep.dataforge.vision.solid.Proxy.Companion.PROXY_CHILD_PROPERTY_PREFIX
 import hep.dataforge.vision.solid.Solid
+import info.laht.threekt.core.BufferGeometry
 import info.laht.threekt.core.Object3D
+import info.laht.threekt.objects.Mesh
+import kotlin.reflect.KClass
 
 class ThreeProxyFactory(val three: ThreePlugin) : ThreeFactory<Proxy> {
     private val cache = HashMap<Solid, Object3D>()
 
-    override val type = Proxy::class
+    override val type: KClass<Proxy> = Proxy::class
+
+    private fun Object3D.replicate(): Object3D {
+        return when (this) {
+            is Mesh -> Mesh(geometry as BufferGeometry, material)
+            else -> clone(false)
+        }.also { obj: Object3D ->
+            children.forEach { child: Object3D ->
+                obj.add(child.replicate())
+            }
+        }
+    }
 
     override fun invoke(obj: Proxy): Object3D {
         val template = obj.prototype
@@ -17,16 +31,16 @@ class ThreeProxyFactory(val three: ThreePlugin) : ThreeFactory<Proxy> {
             three.buildObject3D(template)
         }
 
-        //val mesh = Mesh(templateMesh.geometry as BufferGeometry, templateMesh.material)
+        val object3D: Object3D = cachedObject.replicate()
-        val object3D = cachedObject.clone()
+
         object3D.updatePosition(obj)
 
-        obj.onPropertyChange(this) { name->
+        obj.onPropertyChange(this) { name ->
             if (name.first()?.body == PROXY_CHILD_PROPERTY_PREFIX) {
                 val childName = name.first()?.index?.toName() ?: error("Wrong syntax for proxy child property: '$name'")
                 val propertyName = name.cutFirst()
                 val proxyChild = obj[childName] ?: error("Proxy child with name '$childName' not found")
-                val child = object3D.findChild(childName)?: error("Object child with name '$childName' not found")
+                val child = object3D.findChild(childName) ?: error("Object child with name '$childName' not found")
                 child.updateProperty(proxyChild, propertyName)
             } else {
                 object3D.updateProperty(obj, name)

visionforge-solid/src/jsMain/kotlin/info/laht/threekt/objects/LineSegments.kt

@@ -34,4 +34,7 @@ import info.laht.threekt.materials.Material
 
 open external class LineSegments(geometry: BufferGeometry, material: Material) : Object3D {
     constructor(geometry: Geometry, material: Material)
+
+    var geometry: BufferGeometry
+    var material: Material
 }