diff --git a/dataforge-vis-spatial-gdml/src/commonMain/kotlin/hep/dataforge/vis/spatial/gdml/GDMLTransformer.kt b/dataforge-vis-spatial-gdml/src/commonMain/kotlin/hep/dataforge/vis/spatial/gdml/GDMLTransformer.kt
index 200ab034..953474ca 100644
--- a/dataforge-vis-spatial-gdml/src/commonMain/kotlin/hep/dataforge/vis/spatial/gdml/GDMLTransformer.kt
+++ b/dataforge-vis-spatial-gdml/src/commonMain/kotlin/hep/dataforge/vis/spatial/gdml/GDMLTransformer.kt
@@ -2,7 +2,6 @@ package hep.dataforge.vis.spatial.gdml
 
 import hep.dataforge.meta.Meta
 import hep.dataforge.meta.buildMeta
-import hep.dataforge.meta.builder
 import hep.dataforge.vis.spatial.VisualGroup3D
 import hep.dataforge.vis.spatial.VisualObject3D
 import hep.dataforge.vis.spatial.material
@@ -30,9 +29,9 @@ class GDMLTransformer(val root: GDML) {
     var volumeAction: (GDMLGroup) -> Action = { Action.ACCEPT }
 
 
-    var transparent: GDMLVolume.(GDMLSolid?) -> Boolean = { !physVolumes.isEmpty() }
+    var configure: VisualObject3D.(parent: GDMLVolume, solid: GDMLSolid) -> Unit = { _, _ -> }
 
-    internal fun configureSolid(obj: VisualObject3D, parent: GDMLVolume, solid: GDMLSolid?) {
+    internal fun configureSolid(obj: VisualObject3D, parent: GDMLVolume, solid: GDMLSolid) {
         val material = parent.materialref.resolve(root) ?: GDMLElement(parent.materialref.ref)
 
         val materialColor = materialCache.getOrPut(material) {
@@ -41,11 +40,8 @@ class GDMLTransformer(val root: GDML) {
             }
         }
 
-        obj.material = if (parent.transparent(solid)) {
-            materialColor.builder().apply { "opacity" to 0.5 }
-        } else {
-            materialColor
-        }
+        obj.material = materialColor
+        obj.configure(parent, solid)
     }
 
     fun printStatistics() {
diff --git a/dataforge-vis-spatial-gdml/src/jsMain/kotlin/hep/dataforge/vis/spatial/gdml/demo/GDMLDemoApp.kt b/dataforge-vis-spatial-gdml/src/jsMain/kotlin/hep/dataforge/vis/spatial/gdml/demo/GDMLDemoApp.kt
index 444961fc..bad2b014 100644
--- a/dataforge-vis-spatial-gdml/src/jsMain/kotlin/hep/dataforge/vis/spatial/gdml/demo/GDMLDemoApp.kt
+++ b/dataforge-vis-spatial-gdml/src/jsMain/kotlin/hep/dataforge/vis/spatial/gdml/demo/GDMLDemoApp.kt
@@ -6,6 +6,7 @@ import hep.dataforge.vis.hmr.startApplication
 import hep.dataforge.vis.spatial.gdml.GDMLTransformer
 import hep.dataforge.vis.spatial.gdml.LUnit
 import hep.dataforge.vis.spatial.gdml.toVisual
+import hep.dataforge.vis.spatial.opacity
 import hep.dataforge.vis.spatial.three.ThreePlugin
 import hep.dataforge.vis.spatial.three.output
 import kotlinx.coroutines.CoroutineScope
@@ -93,22 +94,41 @@ private class GDMLDemoApp : ApplicationBase() {
                 lUnit = LUnit.CM
                 volumeAction = { volume ->
                     when {
-                        volume.name.startsWith("ecal") -> GDMLTransformer.Action.REJECT
+                        volume.name.startsWith("ecal01lay") -> GDMLTransformer.Action.REJECT
+                        volume.name.startsWith("ecal") -> GDMLTransformer.Action.CACHE
+                        volume.name.startsWith("UPBL") -> GDMLTransformer.Action.REJECT
+                        volume.name.startsWith("USCL") -> GDMLTransformer.Action.REJECT
                         volume.name.startsWith("U") -> GDMLTransformer.Action.CACHE
+                        volume.name.startsWith("VPBL") -> GDMLTransformer.Action.REJECT
+                        volume.name.startsWith("VSCL") -> GDMLTransformer.Action.REJECT
                         volume.name.startsWith("V") -> GDMLTransformer.Action.CACHE
                         else -> GDMLTransformer.Action.ACCEPT
                     }
                 }
 
-                transparent = { !physVolumes.isEmpty() || (it?.name?.startsWith("Coil") ?: false) }
-
+                configure = { parent, solid ->
+                    if (!parent.physVolumes.isEmpty()) {
+                        opacity = 0.3
+                    }
+                    if (solid.name.startsWith("Coil")
+                        || solid.name.startsWith("Yoke")
+                        || solid.name.startsWith("Magnet")
+                        || solid.name.startsWith("Pole")
+                    ) {
+                        opacity = 0.3
+                    }
+                }
             }
             launch { message("Rendering") }
             val output = three.output(canvas) {
-                "axis" to {
-                    "size" to 100
-                }
+//                "axis" to {
+//                    "size" to 100
+//                }
             }
+            //make top layer visible
+            //output.camera.layers.disable(0)
+            output.camera.layers.enable(1)
+
             output.render(visual)
             launch {
                 message(null)
diff --git a/dataforge-vis-spatial/src/commonMain/kotlin/hep/dataforge/vis/spatial/VisualGroup3D.kt b/dataforge-vis-spatial/src/commonMain/kotlin/hep/dataforge/vis/spatial/VisualGroup3D.kt
index 5cf750a0..98995f59 100644
--- a/dataforge-vis-spatial/src/commonMain/kotlin/hep/dataforge/vis/spatial/VisualGroup3D.kt
+++ b/dataforge-vis-spatial/src/commonMain/kotlin/hep/dataforge/vis/spatial/VisualGroup3D.kt
@@ -17,7 +17,7 @@ import kotlinx.serialization.Serializable
 import kotlinx.serialization.UseSerializers
 
 @Serializable
-class VisualGroup3D() : AbstractVisualGroup(), VisualObject3D {
+class VisualGroup3D : AbstractVisualGroup(), VisualObject3D {
     /**
      * A container for templates visible inside this group
      */
diff --git a/dataforge-vis-spatial/src/commonMain/kotlin/hep/dataforge/vis/spatial/VisualObject3D.kt b/dataforge-vis-spatial/src/commonMain/kotlin/hep/dataforge/vis/spatial/VisualObject3D.kt
index f36a33d0..c61a9df2 100644
--- a/dataforge-vis-spatial/src/commonMain/kotlin/hep/dataforge/vis/spatial/VisualObject3D.kt
+++ b/dataforge-vis-spatial/src/commonMain/kotlin/hep/dataforge/vis/spatial/VisualObject3D.kt
@@ -94,12 +94,20 @@ var VisualObject.material: Meta?
     get() = getProperty(MATERIAL_KEY).node
     set(value) = setProperty(MATERIAL_KEY, value)
 
+var VisualObject.opacity: Double
+    get() = material?.get("opacity").double ?: 1.0
+    set(value) {
+        material = (material?.builder() ?: MetaBuilder()).apply {
+            "opacity" to value
+        }
+    }
+
 var VisualObject.visible: Boolean?
     get() = getProperty(VISIBLE_KEY).boolean
     set(value) = setProperty(VISIBLE_KEY, value)
 
 fun VisualObject.color(rgb: Int) {
-    material = buildMeta { "color" to rgb }
+    material = (material?.builder() ?: MetaBuilder()).apply { "color" to rgb }
 }
 
 fun VisualObject3D.material(builder: MetaBuilder.() -> Unit) {
diff --git a/dataforge-vis-spatial/src/jsMain/kotlin/hep/dataforge/vis/spatial/three/ThreeFactory.kt b/dataforge-vis-spatial/src/jsMain/kotlin/hep/dataforge/vis/spatial/three/ThreeFactory.kt
index 8d39a08f..bb5dc5b2 100644
--- a/dataforge-vis-spatial/src/jsMain/kotlin/hep/dataforge/vis/spatial/three/ThreeFactory.kt
+++ b/dataforge-vis-spatial/src/jsMain/kotlin/hep/dataforge/vis/spatial/three/ThreeFactory.kt
@@ -43,6 +43,13 @@ internal fun Object3D.updatePosition(obj: VisualObject3D) {
     updateMatrix()
 }
 
+/**
+ * Count number of layers to the top object. Return 1 if this is top layer
+ */
+val VisualObject3D.layer: Int
+    get() = getProperty(MeshThreeFactory.LAYER_KEY).int ?: ((parent as? VisualObject3D)?.layer ?: 0 + 1)
+
+
 internal fun <T : VisualObject3D> Mesh.updateFrom(obj: T) {
     matrixAutoUpdate = false
 
@@ -61,8 +68,9 @@ internal fun <T : VisualObject3D> Mesh.updateFrom(obj: T) {
     //set position for mesh
     updatePosition(obj)
 
-    obj.getProperty(MeshThreeFactory.LAYER_KEY).int?.let {
-        layers.set(it)
+    layers.enable(obj.layer)
+    children.forEach {
+        it.layers.enable(obj.layer)
     }
 }
 
diff --git a/dataforge-vis-spatial/src/jsMain/kotlin/hep/dataforge/vis/spatial/three/ThreeOutput.kt b/dataforge-vis-spatial/src/jsMain/kotlin/hep/dataforge/vis/spatial/three/ThreeOutput.kt
index 81de1a89..fb191900 100644
--- a/dataforge-vis-spatial/src/jsMain/kotlin/hep/dataforge/vis/spatial/three/ThreeOutput.kt
+++ b/dataforge-vis-spatial/src/jsMain/kotlin/hep/dataforge/vis/spatial/three/ThreeOutput.kt
@@ -27,7 +27,7 @@ class ThreeOutput(val three: ThreePlugin, val meta: Meta = EmptyMeta) : Output<V
         }
     }
 
-    private val camera = three.buildCamera(meta["camera"].node ?: EmptyMeta)
+    val camera = three.buildCamera(meta["camera"].node ?: EmptyMeta)
 
     fun attach(element: Element, computeWidth: Element.() -> Int = { element.clientWidth }) {
         val width by meta.number(computeWidth(element)).int
diff --git a/dataforge-vis-spatial/src/jsMain/kotlin/info/laht/threekt/core/Layers.kt b/dataforge-vis-spatial/src/jsMain/kotlin/info/laht/threekt/core/Layers.kt
index b33a302b..503878d1 100644
--- a/dataforge-vis-spatial/src/jsMain/kotlin/info/laht/threekt/core/Layers.kt
+++ b/dataforge-vis-spatial/src/jsMain/kotlin/info/laht/threekt/core/Layers.kt
@@ -71,5 +71,5 @@ external class Layers {
      * Returns true if this and the passed layers object are members of the same set of layers.
      * @param layers a Layers object
      */
-    fun test(layers: Int)
+    fun test(layers: Layers): Boolean
 }
\ No newline at end of file