diff --git a/cern-root-loader/src/commonMain/kotlin/ru/mipt/npm/root/dRootToSolid.kt b/cern-root-loader/src/commonMain/kotlin/ru/mipt/npm/root/dRootToSolid.kt
index 13b1cb55..07112c06 100644
--- a/cern-root-loader/src/commonMain/kotlin/ru/mipt/npm/root/dRootToSolid.kt
+++ b/cern-root-loader/src/commonMain/kotlin/ru/mipt/npm/root/dRootToSolid.kt
@@ -209,9 +209,9 @@ private fun SolidGroup.addShape(
                 require(fNz > 1) { "The polyhedron geometry requires at least two planes" }
                 val baseRadius = fRmax[0]
                 shape {
-                    (0..fNedges).forEach {
-                        val phi = deltaphi * fNedges * it + startphi
-                        (baseRadius * cos(phi) to baseRadius * sin(phi))
+                    (0..<fNedges).forEach {
+                        val phi = deltaphi / fNedges * it + startphi
+                        point(baseRadius * cos(phi), baseRadius * sin(phi))
                     }
                 }
                 (0 until fNz).forEach { index ->
diff --git a/demo/playground/src/jvmMain/kotlin/extruded.kt b/demo/playground/src/jvmMain/kotlin/extruded.kt
new file mode 100644
index 00000000..8a25549f
--- /dev/null
+++ b/demo/playground/src/jvmMain/kotlin/extruded.kt
@@ -0,0 +1,21 @@
+package space.kscience.visionforge.examples
+
+import space.kscience.visionforge.solid.ambientLight
+import space.kscience.visionforge.solid.extruded
+import space.kscience.visionforge.solid.polygon
+import space.kscience.visionforge.solid.solid
+
+fun main() = makeVisionFile {
+    vision("canvas") {
+        solid {
+            ambientLight()
+            extruded("extruded") {
+                shape{
+                    polygon(8, 100)
+                    layer(-30)
+                    layer(30)
+                }
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/demo/playground/src/jvmMain/kotlin/rootParser.kt b/demo/playground/src/jvmMain/kotlin/rootParser.kt
index 85a2f0d3..1faa8d0b 100644
--- a/demo/playground/src/jvmMain/kotlin/rootParser.kt
+++ b/demo/playground/src/jvmMain/kotlin/rootParser.kt
@@ -46,7 +46,7 @@ fun main() {
                 ambientLight {
                     color(Colors.white)
                 }
-                rootGeo(geo,"BM@N", maxLayer = 3, ignoreRootColors = true).also {
+                rootGeo(geo,"BM@N", ignoreRootColors = true).also {
                     Path("data/BM@N.vf.json").writeText(Solids.encodeToString(it))
                 }
             }
diff --git a/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/VisionManager.kt b/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/VisionManager.kt
index 2be8a6b3..e4ca1cdb 100644
--- a/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/VisionManager.kt
+++ b/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/VisionManager.kt
@@ -35,7 +35,6 @@ public class VisionManager(meta: Meta) : AbstractPlugin(meta), MutableVisionCont
 
     public val jsonFormat: Json
         get() = Json(defaultJson) {
-            encodeDefaults = false
             serializersModule = this@VisionManager.serializersModule
         }
 
@@ -85,7 +84,6 @@ public class VisionManager(meta: Meta) : AbstractPlugin(meta), MutableVisionCont
             serializersModule = defaultSerialModule
             prettyPrint = true
             useArrayPolymorphism = false
-            encodeDefaults = false
             ignoreUnknownKeys = true
             explicitNulls = false
         }
diff --git a/visionforge-gdml/src/commonMain/kotlin/space/kscience/visionforge/gdml/gdmlLoader.kt b/visionforge-gdml/src/commonMain/kotlin/space/kscience/visionforge/gdml/gdmlLoader.kt
index 230af4b0..0c81d258 100644
--- a/visionforge-gdml/src/commonMain/kotlin/space/kscience/visionforge/gdml/gdmlLoader.kt
+++ b/visionforge-gdml/src/commonMain/kotlin/space/kscience/visionforge/gdml/gdmlLoader.kt
@@ -207,9 +207,9 @@ private class GdmlLoader(val settings: GdmlLoaderOptions) {
                 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 {
+                    (0..<solid.numsides).forEach {
                         val phi = solid.deltaphi * aScale / solid.numsides * it + solid.startphi * aScale
-                        (baseRadius * cos(phi) to baseRadius * sin(phi))
+                        point(baseRadius * cos(phi), baseRadius * sin(phi))
                     }
                 }
                 solid.planes.forEach { plane ->
diff --git a/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/Extruded.kt b/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/Extruded.kt
index 1a6487b9..014db562 100644
--- a/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/Extruded.kt
+++ b/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/Extruded.kt
@@ -23,8 +23,6 @@ public class Shape2DBuilder(private val points: ArrayList<Float32Vector2D> = Arr
         points.add(Float32Vector2D(x, y))
     }
 
-    public infix fun Number.to(y: Number): Unit = point(this, y)
-
     public fun build(): Shape2D = points
 }