diff --git a/demo/muon-monitor/src/commonMain/kotlin/ru/mipt/npm/muon/monitor/Model.kt b/demo/muon-monitor/src/commonMain/kotlin/ru/mipt/npm/muon/monitor/Model.kt
index 854e520c..0c5e0af0 100644
--- a/demo/muon-monitor/src/commonMain/kotlin/ru/mipt/npm/muon/monitor/Model.kt
+++ b/demo/muon-monitor/src/commonMain/kotlin/ru/mipt/npm/muon/monitor/Model.kt
@@ -28,7 +28,6 @@ class Model(val manager: VisionManager) {
 
     private fun SolidGroup.detector(detector: SC16) {
         group(detector.name) {
-            position = detector.center
             detector.pixels.forEach {
                 pixel(it)
             }
@@ -65,6 +64,7 @@ class Model(val manager: VisionManager) {
     }
 
     private fun highlight(pixel: String) {
+        println("highlight $pixel")
         map[pixel]?.color?.invoke("blue")
     }
 
@@ -76,6 +76,7 @@ class Model(val manager: VisionManager) {
     }
 
     fun displayEvent(event: Event) {
+        println("Received event: $event")
         events.add(event)
         event.hits.forEach {
             highlight(it)
@@ -83,6 +84,7 @@ class Model(val manager: VisionManager) {
         event.track?.let {
             tracks.polyline(*it.toTypedArray(), name = "track[${event.id}]") {
                 thickness = 4
+                color("red")
             }
         }
     }
diff --git a/demo/muon-monitor/src/commonMain/kotlin/ru/mipt/npm/muon/monitor/Monitor.kt b/demo/muon-monitor/src/commonMain/kotlin/ru/mipt/npm/muon/monitor/Monitor.kt
index 3b64bb5a..3e1db5bc 100644
--- a/demo/muon-monitor/src/commonMain/kotlin/ru/mipt/npm/muon/monitor/Monitor.kt
+++ b/demo/muon-monitor/src/commonMain/kotlin/ru/mipt/npm/muon/monitor/Monitor.kt
@@ -3,6 +3,7 @@ package ru.mipt.npm.muon.monitor
 import ru.mipt.npm.muon.monitor.Monitor.PIXEL_XY_SIZE
 import ru.mipt.npm.muon.monitor.Monitor.PIXEL_Z_SIZE
 import space.kscience.visionforge.solid.Point3D
+import space.kscience.visionforge.solid.plus
 
 /**
  * A single pixel
@@ -97,7 +98,7 @@ class SC16(
             }
             val offset = Point3D(-y, x, 0)//rotateDetector(Point3D(x, y, 0.0));
             val pixelName = "${name}_${index}"
-            SC1(pixelName, offset)
+            SC1(pixelName, offset + center)
         }
     }
 }
diff --git a/demo/muon-monitor/src/jsMain/kotlin/ru/mipt/npm/muon/monitor/MMAppComponent.kt b/demo/muon-monitor/src/jsMain/kotlin/ru/mipt/npm/muon/monitor/MMAppComponent.kt
index d981fa44..8450cb4a 100644
--- a/demo/muon-monitor/src/jsMain/kotlin/ru/mipt/npm/muon/monitor/MMAppComponent.kt
+++ b/demo/muon-monitor/src/jsMain/kotlin/ru/mipt/npm/muon/monitor/MMAppComponent.kt
@@ -56,8 +56,10 @@ val MMApp = functionalComponent<MMAppProps>("Muon monitor") { props ->
         }
     }
 
-    val root = props.model.root.apply {
-        edges()
+    val root = useMemo(props.model) {
+        props.model.root.apply {
+            edges()
+        }
     }
 
     gridRow {
diff --git a/demo/muon-monitor/src/jvmMain/kotlin/ru/mipt/npm/muon/monitor/sim/Pixel.kt b/demo/muon-monitor/src/jvmMain/kotlin/ru/mipt/npm/muon/monitor/sim/Pixel.kt
index 579bca15..7cd54417 100644
--- a/demo/muon-monitor/src/jvmMain/kotlin/ru/mipt/npm/muon/monitor/sim/Pixel.kt
+++ b/demo/muon-monitor/src/jvmMain/kotlin/ru/mipt/npm/muon/monitor/sim/Pixel.kt
@@ -16,10 +16,10 @@ import kotlin.random.Random
  */
 internal class SC1Aux(val sc: SC1, var efficiency: Double = 1.0) {
     //    val layer: Layer = findLayer(center.z);
-    private val upLayer =
-        findLayer(sc.center.z + sc.zSize / 2f)//Layer("${name}_up", center.z + zSize / 2.0);
-    private val bottomLayer =
-        findLayer(sc.center.z - sc.zSize / 2f)//Layer("${name}_bottom", center.z - zSize / 2.0);
+    private val upLayer = findLayer(sc.center.z + sc.zSize / 2f)
+    //Layer("${name}_up", center.z + zSize / 2.0);
+    private val bottomLayer = findLayer(sc.center.z - sc.zSize / 2f)
+    //Layer("${name}_bottom", center.z - zSize / 2.0);
     private val centralLayer = findLayer(sc.center.z)
 
     private val center = Vector3D(sc.center.x.toDouble(), sc.center.y.toDouble(), sc.center.z.toDouble())
@@ -115,8 +115,8 @@ internal class SC1Aux(val sc: SC1, var efficiency: Double = 1.0) {
 
 private val auxCache = HashMap<SC1, SC1Aux>()
 
-fun SC1.isHit(track: Line): Boolean{
-    return auxCache.getOrPut(this){
+fun SC1.isHit(track: Line): Boolean {
+    return auxCache.getOrPut(this) {
         SC1Aux(this)
     }.isHit(track)
 }
\ No newline at end of file
diff --git a/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeLineFactory.kt b/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeLineFactory.kt
index 49fca0d9..ee36d74b 100644
--- a/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeLineFactory.kt
+++ b/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeLineFactory.kt
@@ -7,9 +7,11 @@ import info.laht.threekt.objects.LineSegments
 import space.kscience.visionforge.computePropertyNode
 import space.kscience.visionforge.onPropertyChange
 import space.kscience.visionforge.solid.PolyLine
+import space.kscience.visionforge.solid.SolidMaterial
 import space.kscience.visionforge.solid.color
 import space.kscience.visionforge.solid.string
 import space.kscience.visionforge.solid.three.ThreeMaterials.DEFAULT_LINE_COLOR
+import kotlin.math.ceil
 import kotlin.reflect.KClass
 
 public object ThreeLineFactory : ThreeFactory<PolyLine> {
@@ -17,12 +19,14 @@ public object ThreeLineFactory : ThreeFactory<PolyLine> {
 
     override fun invoke(three: ThreePlugin, obj: PolyLine): Object3D {
         val geometry = BufferGeometry().apply {
-            setFromPoints(Array(obj.points.size) { obj.points[it].toVector() })
+            setFromPoints(Array((obj.points.size - 1) * 2) {
+                obj.points[ceil(it / 2.0).toInt()].toVector()
+            })
         }
 
         val material = ThreeMaterials.getLineMaterial(
-            obj.computePropertyNode(MeshThreeFactory.EDGES_MATERIAL_KEY),
-            true
+            obj.computePropertyNode(SolidMaterial.MATERIAL_KEY),
+            false
         )
 
         material.linewidth = obj.thickness.toDouble()