GDML converter refactoring

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

@@ -7,6 +7,7 @@ import hep.dataforge.names.Name
 import hep.dataforge.names.asName
 import hep.dataforge.names.plus
 import hep.dataforge.names.toName
+import hep.dataforge.vision.MutableVisionGroup
 import hep.dataforge.vision.set
 import hep.dataforge.vision.solid.*
 import hep.dataforge.vision.solid.SolidMaterial.Companion.MATERIAL_COLOR_KEY
@@ -19,7 +20,7 @@ import kotlin.random.Random
 private val solidsName = "solids".asName()
 private val volumesName = "volumes".asName()
 
-class GDMLTransformer(val root: GDML) {
+class GDMLTransformer internal constructor(val root: GDML) {
     //private val materialCache = HashMap<GDMLMaterial, Meta>()
     private val random = Random(222)
 
@@ -38,25 +39,35 @@ class GDMLTransformer(val root: GDML) {
     /**
      * A special group for local templates
      */
-    internal val proto by lazy { SolidGroup() }
+    private val proto by lazy { SolidGroup() }
 
-    internal val solids by lazy {
+    private val solids by lazy {
         proto.group(solidsName) {
             config["edges.enabled"] = false
         }
     }
 
-    internal val volumes by lazy {
+    private val referenceStore = HashMap<Name, MutableList<Proxy>>()
-        proto.group(volumesName)
+
+    private fun proxySolid(group: SolidGroup, solid: GDMLSolid, name: String): Proxy {
+        val templateName = solidsName + name
+        if (proto[templateName] == null) {
+            solids.addSolid(solid, name)
+        }
+        val ref = group.ref(templateName, name)
+        referenceStore.getOrPut(templateName) { ArrayList() }.add(ref)
+        return ref
     }
 
-//    fun proxySolid(group: SolidGroup, solid: GDMLSolid, name: String): Proxy {
+    private fun proxyVolume(group: SolidGroup, physVolume: GDMLPhysVolume, volume: GDMLGroup): Proxy {
-//        val fullName = solidsName + name
+        val templateName = volumesName + volume.name.asName()
-//        if (proto[fullName] == null) {
+        if (proto[templateName] == null) {
-//            solids.addSolid(this, solid, name)
+            proto[templateName] = volume(volume)
-//        }
+        }
-//        return group.ref(fullName, name)
+        val ref = group.ref(templateName, physVolume.name ?: "").withPosition(physVolume)
-//    }
+        referenceStore.getOrPut(templateName) { ArrayList() }.add(ref)
+        return ref
+    }
 
     private val styleCache = HashMap<Name, Meta>()
 
@@ -70,14 +81,14 @@ class GDMLTransformer(val root: GDML) {
         }
     }
 
-    fun Solid.useStyle(name: String, builder: MetaBuilder.() -> Unit) {
+    private fun Solid.useStyle(name: String, builder: MetaBuilder.() -> Unit) {
         styleCache.getOrPut(name.toName()) {
             Meta(builder)
         }
         useStyle(name)
     }
 
-    internal fun configureSolid(obj: Solid, parent: GDMLVolume, solid: GDMLSolid) {
+    private fun configureSolid(obj: Solid, parent: GDMLVolume, solid: GDMLSolid) {
         val material = parent.materialref.resolve(root) ?: GDMLElement(parent.materialref.ref)
 
         val styleName = "material[${material.name}]"
@@ -92,8 +103,244 @@ class GDMLTransformer(val root: GDML) {
 
     var onFinish: GDMLTransformer.() -> Unit = {}
 
-    internal fun finalize(final: SolidGroup): SolidGroup {
+
+    private fun <T : Solid> T.withPosition(
+        newPos: GDMLPosition? = null,
+        newRotation: GDMLRotation? = null,
+        newScale: GDMLScale? = null
+    ): T = 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(aUnit), it.y(aUnit), it.z(aUnit))
+            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
+    }
+
+    private fun <T : Solid> T.withPosition(physVolume: GDMLPhysVolume): T = withPosition(
+        physVolume.resolvePosition(root),
+        physVolume.resolveRotation(root),
+        physVolume.resolveScale(root)
+    )
+
+    @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(
+        solid: GDMLSolid,
+        name: String = ""
+    ): Solid {
+        //context.solidAdded(solid)
+        val lScale = solid.lscale(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: GDMLSolid = solid.solidref.resolve(root)
+                    ?: error("Solid with tag ${solid.solidref.ref} for scaled solid ${solid.name} not defined")
+
+                addSolid(innerSolid, name).apply {
+                    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: GDMLSolid = solid.first.resolve(root) ?: error("")
+                val second: GDMLSolid = solid.second.resolve(root) ?: error("")
+                val type: CompositeType = when (solid) {
+                    is GDMLUnion -> CompositeType.UNION
+                    is GDMLSubtraction -> CompositeType.SUBTRACT
+                    is GDMLIntersection -> CompositeType.INTERSECT
+                }
+
+                return composite(type, name) {
+                    addSolid(first).withPosition(
+                        solid.resolveFirstPosition(root),
+                        solid.resolveFirstRotation(root),
+                        null
+                    )
+
+                    addSolid(second).withPosition(
+                        solid.resolvePosition(root),
+                        solid.resolveRotation(root),
+                        null
+                    )
+
+                }
+            }
+            else -> error("Renderer for $solid not supported yet")
+        }
+    }
+
+    private fun SolidGroup.addSolidWithCaching(
+        solid: GDMLSolid,
+        name: String = solid.name
+    ): Solid? {
+        return when (solidAction(solid)) {
+            Action.ADD -> {
+                addSolid(solid, name)
+            }
+            Action.PROTOTYPE -> {
+                proxySolid(this, solid, name)
+            }
+            Action.REJECT -> {
+                //ignore
+                null
+            }
+        }
+    }
+
+    private fun SolidGroup.addPhysicalVolume(
+        physVolume: GDMLPhysVolume
+    ) {
+        val volume: GDMLGroup = physVolume.volumeref.resolve(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(root)
+                ?: error("Solid with tag ${volume.solidref.ref} for volume ${volume.name} not defined")
+            addSolidWithCaching(solid, physVolume.name ?: "")?.apply {
+                configureSolid(this, volume, solid)
+                withPosition(physVolume)
+            }
+            return
+        }
+
+        when (volumeAction(volume)) {
+            Action.ADD -> {
+                val group: SolidGroup = volume(volume)
+                this[physVolume.name ?: ""] = group.withPosition(physVolume)
+            }
+            Action.PROTOTYPE -> {
+                proxyVolume(this, physVolume, volume)
+            }
+            Action.REJECT -> {
+                //ignore
+            }
+        }
+    }
+
+    private fun SolidGroup.addDivisionVolume(
+        divisionVolume: GDMLDivisionVolume
+    ) {
+        val volume: GDMLGroup = divisionVolume.volumeref.resolve(root)
+            ?: error("Volume with ref ${divisionVolume.volumeref.ref} could not be resolved")
+
+        //TODO add divisions
+        set(Name.EMPTY, volume(volume))
+    }
+
+    private fun volume(
+        group: GDMLGroup
+    ): SolidGroup = SolidGroup().apply {
+        if (group is GDMLVolume) {
+            val solid: GDMLSolid = group.solidref.resolve(root)
+                ?: error("Solid with tag ${group.solidref.ref} for volume ${group.name} not defined")
+
+            addSolidWithCaching(solid)?.apply {
+                configureSolid(this, group, solid)
+            }
+
+            when (val vol: GDMLPlacement? = group.placement) {
+                is GDMLPhysVolume -> addPhysicalVolume(vol)
+                is GDMLDivisionVolume -> addDivisionVolume(vol)
+            }
+        }
+
+        group.physVolumes.forEach { physVolume ->
+            addPhysicalVolume(physVolume)
+        }
+    }
+
+    private fun finalize(final: SolidGroup): SolidGroup {
         //final.prototypes = proto
+        final.useStyle("GDML") {
+            Solid.ROTATION_ORDER_KEY put RotationOrder.ZXY
+        }
+
+        //inline prototypes
+//        referenceStore.forEach { (protoName, list) ->
+//            val proxy = list.singleOrNull() ?: return@forEach
+//            val parent = proxy.parent as? MutableVisionGroup ?: return@forEach
+//            val token = parent.children.entries.find { it.value == proxy }?.key ?: error("Inconsistent reference cache")
+//            val prototype = proto[protoName] as? Solid ?:  error("Inconsistent reference cache")
+//            prototype.parent = null
+//            parent[token] = prototype
+//            prototype.updateFrom(proxy)
+//
+//            //FIXME update prototype
+//            proto[protoName] = null
+//        }
+
         final.prototypes {
             proto.children.forEach { (token, item) ->
                 item.parent = null
@@ -105,252 +352,19 @@ class GDMLTransformer(val root: GDML) {
                 define(it.key.toString(), it.value)
             }
         }
-        final.rotationOrder = RotationOrder.ZXY
         onFinish(this@GDMLTransformer)
         return final
     }
 
-}
+    val result by lazy {
-
+        finalize(volume(root.world))
-private fun Solid.withPosition(
-    lUnit: LUnit,
-    aUnit: AUnit = AUnit.RADIAN,
-    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(aUnit), it.y(aUnit), it.z(aUnit))
-        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
-}
-
-private fun Solid.withPosition(context: GDMLTransformer, physVolume: GDMLPhysVolume) = withPosition(
-    context.lUnit, context.aUnit,
-    physVolume.resolvePosition(context.root),
-    physVolume.resolveRotation(context.root),
-    physVolume.resolveScale(context.root)
-)
-
-@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 = ""
-): 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: GDMLSolid = solid.solidref.resolve(context.root)
-                ?: error("Solid with tag ${solid.solidref.ref} for scaled solid ${solid.name} not defined")
-
-            addSolid(context, innerSolid, name).apply {
-                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: GDMLSolid = solid.first.resolve(context.root) ?: error("")
-            val second: GDMLSolid = 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, context.aUnit,
-                    solid.resolveFirstPosition(context.root),
-                    solid.resolveFirstRotation(context.root),
-                    null
-                )
-
-                addSolid(context, second).withPosition(
-                    context.lUnit, context.aUnit,
-                    solid.resolvePosition(context.root),
-                    solid.resolveRotation(context.root),
-                    null
-                )
-
-            }
-        }
-        else -> error("Renderer for $solid not supported yet")
     }
 }
 
-private fun SolidGroup.addSolidWithCaching(
-    context: GDMLTransformer,
-    solid: GDMLSolid,
-    name: String = solid.name
-): Solid? {
-    return when (context.solidAction(solid)) {
-        GDMLTransformer.Action.ADD -> {
-            addSolid(context, solid, name)
-        }
-        GDMLTransformer.Action.PROTOTYPE -> {
-//            context.proxySolid(this, solid, name)
-            val fullName = solidsName + solid.name.asName()
-            if (context.proto[fullName] == null) {
-                context.solids.addSolid(context, solid, solid.name)
-            }
-            ref(fullName, name)
-        }
-        GDMLTransformer.Action.REJECT -> {
-            //ignore
-            null
-        }
-    }
-}
-
-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, physVolume.name ?: "")?.apply {
-            context.configureSolid(this, volume, solid)
-            withPosition(context, physVolume)
-        }
-        return
-    }
-
-    when (context.volumeAction(volume)) {
-        GDMLTransformer.Action.ADD -> {
-            val group: SolidGroup = volume(context, volume)
-            this[physVolume.name ?: ""] = group.withPosition(context, physVolume)
-        }
-        GDMLTransformer.Action.PROTOTYPE -> {
-            val fullName = volumesName + volume.name.asName()
-            if (context.proto[fullName] == null) {
-                context.proto[fullName] = volume(context, volume)
-            }
-            ref(fullName, physVolume.name ?: "").withPosition(context, physVolume)
-        }
-        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 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)?.apply {
-            context.configureSolid(this, group, solid)
-        }
-
-        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))
+    return context.result
 }
 
 /**

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

@@ -18,72 +18,72 @@ expect class Counter() {
     fun incrementAndGet(): Int
 }
 
-@DFExperimental
+private fun Point3D?.safePlus(other: Point3D?): Point3D? = if (this == null && other == null) {
-private class GdmlOptimizer() : VisionVisitor {
+    null
-    val logger = KotlinLogging.logger("SingleChildReducer")
+} else {
-
+    (this ?: Point3D(0, 0, 0)) + (other ?: Point3D(0, 0, 0))
-    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
+internal fun Vision.updateFrom(other: Vision): Vision {
-suspend fun SolidGroup.optimizeGdml(): Job = coroutineScope {
+    if (this is Solid && other is Solid) {
-    prototypes?.let {
+        position = position.safePlus(other.position)
-        VisionVisitor.visitTree(GdmlOptimizer(), this, it)
+        rotation = rotation.safePlus(other.rotation)
-    } ?: CompletableDeferred(Unit)
+        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
+}
+//
+//@DFExperimental
+//private class GdmlOptimizer() : VisionVisitor {
+//    val logger = KotlinLogging.logger("SingleChildReducer")
+//
+//    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)
+//}