Fix color inheritance issues

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

@@ -9,6 +9,8 @@ import hep.dataforge.names.asName
 import hep.dataforge.names.toName
 import hep.dataforge.provider.Type
 import hep.dataforge.vision.Vision.Companion.TYPE
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.flow.Flow
 import kotlinx.serialization.Transient
 
@@ -24,6 +26,11 @@ public interface Vision : Described {
     @Transient
     public var parent: VisionGroup?
 
+    /**
+     * A coroutine scope for asynchronous calls and locks
+     */
+    public val scope: CoroutineScope get() = parent?.scope?: GlobalScope
+
     /**
      * A fast accessor method to get own property (no inheritance or styles).
      * Should be equivalent to `getProperty(name,false,false,false)`.
@@ -32,8 +39,8 @@ public interface Vision : Described {
 
     /**
      * Get property.
-     * @param inherit toggles parent node property lookup. Null means default inheritance.
+     * @param inherit toggles parent node property lookup. Null means inference from descriptor. Default is false.
-     * @param includeStyles toggles inclusion of. Null means default style inclusion.
+     * @param includeStyles toggles inclusion of. Null means inference from descriptor. Default is true.
      */
     public fun getProperty(
         name: Name,

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

@@ -11,7 +11,6 @@ import hep.dataforge.names.Name
 import hep.dataforge.names.asName
 import hep.dataforge.values.ValueType
 import hep.dataforge.vision.Vision.Companion.STYLE_KEY
-import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.flow.MutableSharedFlow
 import kotlinx.coroutines.flow.SharedFlow
 import kotlinx.coroutines.launch
@@ -103,7 +102,7 @@ public open class VisionBase : Vision {
         if (propertyName == STYLE_KEY) {
             updateStyles(styles)
         }
-        GlobalScope.launch {
+        scope.launch {
             _propertyInvalidationFlow.emit(propertyName)
         }
     }

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

@@ -1,7 +1,6 @@
 package hep.dataforge.vision
 
 import hep.dataforge.names.*
-import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.flow.MutableSharedFlow
 import kotlinx.coroutines.flow.SharedFlow
 import kotlinx.coroutines.launch
@@ -45,7 +44,7 @@ public open class VisionGroupBase : VisionBase(), MutableVisionGroup {
      * Propagate children change event upwards
      */
     private fun childrenChanged(name: NameToken, before: Vision?, after: Vision?) {
-        GlobalScope.launch {
+        scope.launch {
             _structureChanges.emit(MutableVisionGroup.StructureChange(name, before, after))
         }
     }

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

@@ -71,7 +71,7 @@ class FX3DPlugin : AbstractPlugin() {
             is PolyLine -> PolyLine3D(
                 obj.points.map { Point3D(it.x, it.y, it.z) },
                 obj.thickness.toFloat(),
-                obj.getProperty(SolidMaterial.MATERIAL_COLOR_KEY)?.color()
+                obj.getProperty(SolidMaterial.MATERIAL_COLOR_KEY, inherit = true)?.color()
             ).apply {
                 this.meshView.cullFace = CullFace.FRONT
             }

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

@@ -15,8 +15,6 @@ import kotlinx.serialization.encoding.Decoder
 import kotlinx.serialization.encoding.Encoder
 
 public interface PrototypeHolder {
-    public val parent: VisionGroup?
-
     @VisionBuilder
     public fun prototypes(builder: VisionContainerBuilder<Solid>.() -> Unit)
 

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

@@ -76,7 +76,7 @@ public object ThreeMaterials {
     }
 
     public fun getMaterial(vision3D: Vision, cache: Boolean): Material {
-        val meta = vision3D.getProperty(SolidMaterial.MATERIAL_KEY).node ?: return DEFAULT
+        val meta = vision3D.getProperty(SolidMaterial.MATERIAL_KEY, inherit = true).node ?: return DEFAULT
         return if (cache) {
             materialCache.getOrPut(meta) { buildMaterial(meta) }
         } else {