GDML demo renders something

dataforge-vis-spatial-gdml/src/commonMain/kotlin/hep/dataforge/vis/spatial/gdml/units.kt

@@ -0,0 +1,76 @@
+package hep.dataforge.vis.spatial.gdml
+
+import scientifik.gdml.GDMLPosition
+import scientifik.gdml.GDMLRotation
+import scientifik.gdml.GDMLSolid
+import kotlin.math.PI
+
+enum class LUnit(val value: Double) {
+    MM(1.0),
+    CM(10.0),
+    M(1000.0)
+}
+
+enum class AUnit(val value: Double) {
+    DEG(PI / 180),
+    RAD(1.0),
+    RADIAN(1.0)
+}
+
+fun GDMLPosition.unit(): LUnit = LUnit.valueOf(unit.toUpperCase())
+
+fun GDMLPosition.x(unit: LUnit): Double = if (unit.name == this.unit) {
+    x.toDouble()
+} else {
+    x.toDouble() / unit.value * unit().value
+}
+
+fun GDMLPosition.y(unit: LUnit): Double = if (unit.name == this.unit) {
+    y.toDouble()
+} else {
+    y.toDouble() / unit.value * unit().value
+}
+
+fun GDMLPosition.z(unit: LUnit): Double = if (unit.name == this.unit) {
+    z.toDouble()
+} else {
+    z.toDouble() / unit.value * unit().value
+}
+
+fun GDMLRotation.unit(): AUnit = AUnit.valueOf(unit.toUpperCase())
+
+fun GDMLRotation.x(unit: AUnit = AUnit.RAD): Double = if (unit.name == this.unit) {
+    x.toDouble()
+} else {
+    x.toDouble() / unit.value * unit().value
+}
+
+fun GDMLRotation.y(unit: AUnit = AUnit.RAD): Double = if (unit.name == this.unit) {
+    y.toDouble()
+} else {
+    y.toDouble() / unit.value * unit().value
+}
+
+fun GDMLRotation.z(unit: AUnit = AUnit.RAD): Double = if (unit.name == this.unit) {
+    z.toDouble()
+} else {
+    z.toDouble() / unit.value * unit().value
+}
+
+fun GDMLSolid.lscale(unit: LUnit): Double {
+    val solidUnit = lunit?.let { LUnit.valueOf(it.toUpperCase()) } ?: return 1.0
+    return if (solidUnit == unit) {
+        1.0
+    } else {
+        solidUnit.value / unit.value
+    }
+}
+
+fun GDMLSolid.ascale(unit: AUnit = AUnit.RAD): Double {
+    val solidUnit = aunit?.let { AUnit.valueOf(it.toUpperCase()) } ?: return 1.0
+    return if (solidUnit == unit) {
+        1.0
+    } else {
+        solidUnit.value / unit.value
+    }
+}

dataforge-vis-spatial-gdml/src/commonMain/kotlin/hep/dataforge/vis/spatial/gdml/visualGDML.kt

@@ -1,7 +1,7 @@
 package hep.dataforge.vis.spatial.gdml
 
-import hep.dataforge.meta.EmptyMeta
 import hep.dataforge.meta.Meta
+import hep.dataforge.meta.buildMeta
 import hep.dataforge.vis.common.VisualGroup
 import hep.dataforge.vis.common.VisualObject
 import hep.dataforge.vis.common.color
@@ -9,66 +9,64 @@ import hep.dataforge.vis.spatial.*
 import scientifik.gdml.*
 import kotlin.math.cos
 import kotlin.math.sin
+import kotlin.random.Random
 
 
 private fun VisualObject.withPosition(
+    lUnit: LUnit,
     pos: GDMLPosition? = null,
     rotation: GDMLRotation? = null,
     scale: GDMLScale? = null
-): VisualObject =
+): VisualObject = apply {
-    apply {
+    pos?.let {
-        //        if( this is VisualObject3D){
+        x = pos.x(lUnit)
-//            pos?.let {
+        y = pos.y(lUnit)
-//                x = pos.x
+        z = pos.z(lUnit)
-//                y = pos.y
-//                z = pos.z
-//            }
-//            rotation?.let {
-//                rotationX = rotation.x
-//                rotationY = rotation.y
-//                rotationZ = rotation.z
-//            }
-//        } else {
-        pos?.let {
-            x = pos.x
-            y = pos.y
-            z = pos.z
-        }
-        rotation?.let {
-            rotationX = rotation.x
-            rotationY = rotation.y
-            rotationZ = rotation.z
-        }
-        //}
-        scale?.let {
-            scaleX = scale.x
-            scaleY = scale.y
-            scaleZ = scale.z
-        }
-        //TODO convert units if needed
     }
+    rotation?.let {
+        rotationX = rotation.x()
+        rotationY = rotation.y()
+        rotationZ = rotation.z()
+    }
+    scale?.let {
+        scaleX = scale.x
+        scaleY = scale.y
+        scaleZ = scale.z
+    }
+    //TODO convert units if needed
+}
+
+private inline operator fun Number.times(d: Double) = toDouble() * d
 
 
 private fun VisualGroup.addSolid(
     root: GDML,
     solid: GDMLSolid,
+    lUnit: LUnit,
     name: String? = null,
     block: VisualObject.() -> Unit = {}
 ): VisualObject {
+    val lScale = solid.lscale(lUnit)
+    val aScale = solid.ascale()
     return when (solid) {
-        is GDMLBox -> box(solid.x, solid.y, solid.z, name)
+        is GDMLBox -> box(solid.x * lScale, solid.y * lScale, solid.z * lScale, name)
-        is GDMLTube -> cylinder(solid.rmax, solid.z, name) {
+        is GDMLTube -> cylinder(solid.rmax * lScale, solid.z * lScale, name) {
-            startAngle = solid.startphi
+            startAngle = solid.startphi * aScale
-            angle = solid.deltaphi
+            angle = solid.deltaphi * aScale
         }
         is GDMLXtru -> extrude(name) {
             shape {
                 solid.vertices.forEach {
-                    point(it.x, it.y)
+                    point(it.x * lScale, it.y * lScale)
                 }
             }
             solid.sections.sortedBy { it.zOrder }.forEach { section ->
-                layer(section.zPosition, section.xOffset, section.yOffset, section.scalingFactor)
+                layer(
+                    section.zPosition * lScale,
+                    section.xOffset * lScale,
+                    section.yOffset * lScale,
+                    section.scalingFactor
+                )
             }
         }
         is GDMLScaledSolid -> {
@@ -76,31 +74,31 @@ private fun VisualGroup.addSolid(
             val innerSolid = solid.solidref.resolve(root)
                 ?: error("Solid with tag ${solid.solidref.ref} for scaled solid ${solid.name} not defined")
 
-            addSolid(root, innerSolid) {
+            addSolid(root, innerSolid, lUnit) {
                 block()
                 scaleX = scaleX.toDouble() * solid.scale.x.toDouble()
                 scaleY = scaleY.toDouble() * solid.scale.y.toDouble()
                 scaleZ = scaleZ.toDouble() * solid.scale.z.toDouble()
             }
         }
-        is GDMLSphere -> sphere(solid.rmax, solid.deltaphi, solid.deltatheta, name) {
+        is GDMLSphere -> sphere(solid.rmax * lScale, solid.deltaphi * aScale, solid.deltatheta * aScale, name) {
-            phiStart = solid.startphi.toDouble()
+            phiStart = solid.startphi * aScale
-            thetaStart = solid.starttheta.toDouble()
+            thetaStart = solid.starttheta * aScale
         }
-        is GDMLOrb -> sphere(solid.r, name = name)
+        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.toDouble()
+            val baseRadius = solid.planes.first().rmax * lScale
             shape {
                 (0..solid.numsides).forEach {
-                    val phi = solid.deltaphi.toDouble() / solid.numsides * it + solid.startphi.toDouble()
+                    val phi = solid.deltaphi * aScale / solid.numsides * it + solid.startphi * aScale
-                    baseRadius * cos(phi) to baseRadius * sin(phi)
+                    (baseRadius * cos(phi) to baseRadius * sin(phi))
                 }
             }
             solid.planes.forEach { plane ->
                 //scaling all radii relative to first layer radius
-                layer(plane.z, scale = plane.rmax.toDouble() / baseRadius)
+                layer(plane.z * lScale, scale = plane.rmax * lScale / baseRadius)
             }
         }
         is GDMLBoolSolid -> {
@@ -113,19 +111,59 @@ private fun VisualGroup.addSolid(
             }
 
             return composite(type, name) {
-                addSolid(root, first) {
+                addSolid(root, first, lUnit) {
-                    withPosition(solid.resolveFirstPosition(root), solid.resolveFirstRotation(root), null)
+                    withPosition(lUnit, solid.resolveFirstPosition(root), solid.resolveFirstRotation(root), null)
+                }
+                addSolid(root, second, lUnit) {
+                    withPosition(lUnit, solid.resolvePosition(root), solid.resolveRotation(root), null)
                 }
-                addSolid(root, second)
-                withPosition(solid.resolvePosition(root), solid.resolveRotation(root), null)
             }
         }
     }.apply(block)
 }
 
+private fun VisualGroup.addPhysicalVolume(
+    root: GDML,
+    physVolume: GDMLPhysVolume,
+    lUnit: LUnit,
+    resolveColor: GDMLMaterial.() -> Meta
+) {
+    val volume: GDMLGroup = physVolume.volumeref.resolve(root)
+        ?: error("Volume with ref ${physVolume.volumeref.ref} could not be resolved")
+
+    addVolume(
+        root,
+        volume,
+        lUnit,
+        physVolume.resolvePosition(root),
+        physVolume.resolveRotation(root),
+        physVolume.resolveScale(root),
+        resolveColor
+    )
+}
+
+private fun VisualGroup.addDivisionVolume(
+    root: GDML,
+    divisionVolume: GDMLDivisionVolume,
+    lUnit: LUnit,
+    resolveColor: GDMLMaterial.() -> Meta
+) {
+    val volume: GDMLGroup = divisionVolume.volumeref.resolve(root)
+        ?: error("Volume with ref ${divisionVolume.volumeref.ref} could not be resolved")
+
+    //TODO add divisions
+    addVolume(
+        root,
+        volume,
+        lUnit,
+        resolveColor = resolveColor
+    )
+}
+
 private fun VisualGroup.addVolume(
     root: GDML,
     group: GDMLGroup,
+    lUnit: LUnit,
     position: GDMLPosition? = null,
     rotation: GDMLRotation? = null,
     scale: GDMLScale? = null,
@@ -133,40 +171,37 @@ private fun VisualGroup.addVolume(
 ) {
 
     group(group.name) {
-        withPosition(position, rotation, scale)
+        withPosition(lUnit, position, rotation, scale)
 
         if (group is GDMLVolume) {
             val solid = group.solidref.resolve(root)
                 ?: error("Solid with tag ${group.solidref.ref} for volume ${group.name} not defined")
-            val material = group.materialref.resolve(root)
+            val material = group.materialref.resolve(root) ?: GDMLElement(group.materialref.ref)
-                ?: error("Material with tag ${group.materialref.ref} for volume ${group.name} not defined")
+            //?: error("Material with tag ${group.materialref.ref} for volume ${group.name} not defined")
 
-            addSolid(root, solid, solid.name) {
+            addSolid(root, solid, lUnit, solid.name) {
                 color(material.resolveColor())
             }
-            //TODO render placements
+
+            when (val vol = group.placement) {
+                is GDMLPhysVolume -> addPhysicalVolume(root, vol, lUnit, resolveColor)
+                is GDMLDivisionVolume -> addDivisionVolume(root, vol, lUnit, resolveColor)
+            }
         }
 
         group.physVolumes.forEach { physVolume ->
-            val volume: GDMLGroup = physVolume.volumeref.resolve(root)
+            addPhysicalVolume(root, physVolume, lUnit, resolveColor)
-                ?: error("Volume with ref ${physVolume.volumeref.ref} could not be resolved")
-
-            addVolume(
-                root,
-                volume,
-                physVolume.resolvePosition(root),
-                physVolume.resolveRotation(root),
-                physVolume.resolveScale(root),
-                resolveColor
-            )
         }
     }
-
 }
 
+fun GDML.toVisual(lUnit: LUnit = LUnit.MM): VisualGroup {
+    val cache = HashMap<GDMLMaterial, Meta>()
+    val random = Random(111)
 
-fun GDML.toVisual(): VisualGroup {
+    fun GDMLMaterial.color(): Meta = cache.getOrPut(this) {
-    //TODO add materials cache
+        buildMeta { "color" to random.nextInt(0, Int.MAX_VALUE) }
-    fun GDMLMaterial.color(): Meta = EmptyMeta
+    }
-    return VisualGroup().also { it.addVolume(this, world) { color() } }
+
+    return VisualGroup().also { it.addVolume(this, world, lUnit) { color() } }
 }

dataforge-vis-spatial-gdml/src/jsMain/kotlin/hep/dataforge/vis/spatial/gdml/demo/GDMLDemoApp.kt

@@ -3,9 +3,11 @@ package hep.dataforge.vis.spatial.gdml.demo
 import hep.dataforge.context.Global
 import hep.dataforge.vis.hmr.ApplicationBase
 import hep.dataforge.vis.hmr.startApplication
+import hep.dataforge.vis.spatial.gdml.LUnit
 import hep.dataforge.vis.spatial.gdml.toVisual
 import hep.dataforge.vis.spatial.three.ThreePlugin
 import hep.dataforge.vis.spatial.three.output
+import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.launch
 import org.w3c.dom.HTMLDivElement
@@ -32,7 +34,7 @@ private class GDMLDemoApp : ApplicationBase() {
     /**
      * Load data from text file
      */
-    private fun loadData(event: Event, block: suspend (String) -> Unit) {
+    private fun loadData(event: Event, block: suspend CoroutineScope.(String) -> Unit) {
         event.stopPropagation()
         event.preventDefault()
 
@@ -51,6 +53,25 @@ private class GDMLDemoApp : ApplicationBase() {
         }
     }
 
+    private fun spinner(show: Boolean) {
+        val style = if (show) {
+            "display:block;"
+        } else {
+            "display:none;"
+        }
+        document.getElementById("loader")?.setAttribute("style", style)
+    }
+
+    private fun message(message: String?) {
+        val element = document.getElementById("message")
+        if (message == null) {
+            element?.setAttribute("style", "display:none;")
+        } else {
+            element?.textContent = message
+            element?.setAttribute("style", "display:block;")
+        }
+    }
+
 
     override fun start(state: Map<String, Any>) {
 
@@ -59,13 +80,22 @@ private class GDMLDemoApp : ApplicationBase() {
         //val url = URL("https://drive.google.com/open?id=1w5e7fILMN83JGgB8WANJUYm8OW2s0WVO")
 
         val canvas = document.getElementById("canvas") ?: error("Element with id canvas not found on page")
+        canvas.clear()
 
-        val action: suspend (String) -> Unit = {
+        val action: suspend CoroutineScope.(String) -> Unit = {
             canvas.clear()
-            val output = three.output(canvas)
+            launch { spinner(true) }
+            launch { message("Loading GDML") }
             val gdml = GDML.format.parse(GDML.serializer(), it)
-            val visual = gdml.toVisual()
+            launch { message("Converting GDML into DF-VIS format") }
+            val visual = gdml.toVisual(LUnit.CM)
+            launch { message("Rendering") }
+            val output = three.output(canvas)
             output.render(visual)
+            launch {
+                message(null)
+                spinner(false)
+            }
         }
 
         (document.getElementById("drop_zone") as? HTMLDivElement)?.apply {

dataforge-vis-spatial-gdml/src/jsMain/web/index.html

@@ -6,6 +6,7 @@
     <title>Three js demo for particle physics</title>
     <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css"
           integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
+    <link rel="stylesheet" href="main.css">
     <script type="text/javascript" src="main.bundle.js"></script>
 </head>
 <body class="testApp">
@@ -18,6 +19,8 @@
 <div class="container">
     <h1>GDML demo</h1>
 </div>
+<div class="container loader" id="loader" style="display:none;"></div>
+<div class="container animate-bottom" id="message" style="display:none;"></div>
 <div class="container" id="canvas"></div>
 
 <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"

dataforge-vis-spatial-gdml/src/jsMain/web/main.css

@@ -0,0 +1,13 @@
+.loader {
+    border: 16px solid #f3f3f3; /* Light grey */
+    border-top: 16px solid #3498db; /* Blue */
+    border-radius: 50%;
+    width: 120px;
+    height: 120px;
+    animation: spin 2s linear infinite;
+}
+
+@keyframes spin {
+    0% { transform: rotate(0deg); }
+    100% { transform: rotate(360deg); }
+}

dataforge-vis-spatial-js/src/main/kotlin/hep/dataforge/vis/spatial/three/Materials.kt

@@ -4,6 +4,7 @@ import hep.dataforge.meta.*
 import hep.dataforge.values.ValueType
 import hep.dataforge.vis.common.Colors
 import info.laht.threekt.materials.Material
+import info.laht.threekt.materials.MeshBasicMaterial
 import info.laht.threekt.materials.MeshPhongMaterial
 import info.laht.threekt.math.Color
 
@@ -39,19 +40,20 @@ fun MetaItem<*>.color(): Color {
 }
 
 /**
- * Infer FX material based on meta item
+ * Infer Three material based on meta item
  */
 fun MetaItem<*>?.material(): Material {
     return when (this) {
         null -> Materials.DEFAULT
-        is MetaItem.ValueItem -> MeshPhongMaterial().apply {
+        is MetaItem.ValueItem -> MeshBasicMaterial().apply {
             color = this@material.color()
         }
-        is MetaItem.NodeItem -> MeshPhongMaterial().apply {
+        is MetaItem.NodeItem -> MeshBasicMaterial().apply {
             (node["color"] ?: this@material).let { color = it.color() }
             opacity = node["opacity"]?.double ?: 1.0
             transparent = node["transparent"].boolean ?: (opacity < 1.0)
-            node["specularColor"]?.let { specular = it.color() }
+            //node["specularColor"]?.let { specular = it.color() }
+            side = 2
         }
     }
 }

dataforge-vis-spatial-js/src/main/kotlin/hep/dataforge/vis/spatial/three/ThreeGeometryBuilder.kt

@@ -4,15 +4,19 @@ import hep.dataforge.meta.Meta
 import hep.dataforge.meta.get
 import hep.dataforge.meta.int
 import hep.dataforge.vis.spatial.GeometryBuilder
+import hep.dataforge.vis.spatial.Point2D
 import hep.dataforge.vis.spatial.Point3D
 import info.laht.threekt.core.BufferGeometry
 import info.laht.threekt.core.Face3
 import info.laht.threekt.core.Geometry
+import info.laht.threekt.math.Vector2
 import info.laht.threekt.math.Vector3
 
 // TODO use unsafe cast instead
 fun Point3D.asVector(): Vector3 = Vector3(this.x, this.y, this.z)
 
+fun Point2D.asVector(): Vector2 = Vector2(this.x, this.y)
+
 class ThreeGeometryBuilder : GeometryBuilder<BufferGeometry> {
 
     private val vertices = ArrayList<Point3D>()
@@ -38,6 +42,7 @@ class ThreeGeometryBuilder : GeometryBuilder<BufferGeometry> {
         faces.add(face)
     }
 
+
     override fun build(): BufferGeometry {
         return Geometry().apply {
             vertices = this@ThreeGeometryBuilder.vertices.map { it.asVector() }.toTypedArray()

dataforge-vis-spatial-js/src/main/kotlin/hep/dataforge/vis/spatial/three/ThreePlugin.kt

@@ -41,11 +41,12 @@ class ThreePlugin : AbstractPlugin() {
             is VisualGroup -> Group(obj.mapNotNull {
                 try {
                     buildObject3D(it)
-                } catch (ex: Throwable){
+                } catch (ex: Throwable) {
-                    logger.error(ex){"Failed to render $it"}
+                    console.error(ex)
+                    logger.error(ex) { "Failed to render $it" }
                     null
                 }
-             }).apply {
+            }).apply {
                 updatePosition(obj)
             }
             is Composite -> compositeFactory(obj)

dataforge-vis-spatial/src/commonMain/kotlin/hep/dataforge/vis/spatial/Box.kt

@@ -2,10 +2,11 @@ package hep.dataforge.vis.spatial
 
 import hep.dataforge.meta.Meta
 import hep.dataforge.vis.common.VisualGroup
+import hep.dataforge.vis.common.VisualLeaf
 import hep.dataforge.vis.common.VisualObject
 
 class Box(parent: VisualObject?, val xSize: Number, val ySize: Number, val zSize: Number, meta: Array<out Meta>) :
-    VisualObject3D(parent, meta), Shape {
+    VisualLeaf(parent, meta), Shape {
 
     //TODO add helper for color configuration
 

dataforge-vis-spatial/src/commonMain/kotlin/hep/dataforge/vis/spatial/Composite.kt

@@ -4,6 +4,7 @@ import hep.dataforge.meta.Meta
 import hep.dataforge.meta.seal
 import hep.dataforge.meta.update
 import hep.dataforge.vis.common.VisualGroup
+import hep.dataforge.vis.common.VisualLeaf
 import hep.dataforge.vis.common.VisualObject
 
 enum class CompositeType {
@@ -18,7 +19,7 @@ open class Composite(
     val second: VisualObject,
     val type: CompositeType = CompositeType.UNION,
     meta: Array<out Meta>
-) : VisualObject3D(parent, meta)
+) : VisualLeaf(parent, meta)
 
 fun VisualGroup.composite(
     type: CompositeType,

dataforge-vis-spatial/src/commonMain/kotlin/hep/dataforge/vis/spatial/Extruded.kt

@@ -45,10 +45,23 @@ class Extruded(parent: VisualObject?, meta: Array<out Meta>) : VisualLeaf(parent
     val layers: MutableList<Layer> = ArrayList()
 
     fun layer(z: Number, x: Number = 0.0, y: Number = 0.0, scale: Number = 1.0) {
-        layers.add(Layer(x,y,z,scale))
+        layers.add(Layer(x, y, z, scale))
         //TODO send invalidation signal
     }
 
+    private fun <T : Any> GeometryBuilder<T>.cap(shape: List<Point3D>) {
+        //FIXME won't work for non-convex shapes
+        val center = Point3D(
+            shape.map { it.x.toDouble() }.average(),
+            shape.map { it.y.toDouble() }.average(),
+            shape.map { it.z.toDouble() }.average()
+        )
+        for(i in 0 until (shape.size - 1)){
+            face(shape[i], shape[i+1], center, null)
+        }
+        face(shape.last(), shape.first(),center,null)
+    }
+
     override fun <T : Any> toGeometry(geometryBuilder: GeometryBuilder<T>) {
         val shape: Shape2D = shape
 
@@ -91,6 +104,8 @@ class Extruded(parent: VisualObject?, meta: Array<out Meta>) : VisualLeaf(parent
             )
             lowerLayer = upperLayer
         }
+        geometryBuilder.cap(layers.first().reversed())
+        geometryBuilder.cap(layers.last())
     }
 
     companion object {

dataforge-vis-spatial/src/commonMain/kotlin/hep/dataforge/vis/spatial/VisualObject3D.kt

@@ -4,23 +4,9 @@ import hep.dataforge.meta.*
 import hep.dataforge.names.plus
 import hep.dataforge.output.Output
 import hep.dataforge.vis.common.VisualGroup
-import hep.dataforge.vis.common.VisualLeaf
 import hep.dataforge.vis.common.VisualObject
 import hep.dataforge.vis.common.asName
 
-/**
- * Performance optimized version of visual object
- */
-open class VisualObject3D(parent: VisualObject?, tagRefs: Array<out Meta>) : VisualLeaf(parent, tagRefs) {
-    var x: Number? = null; get() = field ?: (this as VisualLeaf).x
-    var y: Number? = null; get() = field ?: (this as VisualLeaf).y
-    var z: Number? = null; get() = field ?: (this as VisualLeaf).z
-
-    var rotationX: Number? = null; get() = field ?: (this as VisualLeaf).rotationX
-    var rotationY: Number? = null; get() = field ?: (this as VisualLeaf).rotationY
-    var rotationZ: Number? = null; get() = field ?: (this as VisualLeaf).rotationZ
-}
-
 fun VisualGroup.group(key: String? = null, vararg meta: Meta, action: VisualGroup.() -> Unit = {}): VisualGroup =
     VisualGroup(this, meta).apply(action).also { set(key, it) }