diff --git a/cern-root-loader/src/commonMain/kotlin/ru/mipt/npm/root/serialization/jsonToRoot.kt b/cern-root-loader/src/commonMain/kotlin/ru/mipt/npm/root/serialization/jsonToRoot.kt
index 1685c1ac..c443f646 100644
--- a/cern-root-loader/src/commonMain/kotlin/ru/mipt/npm/root/serialization/jsonToRoot.kt
+++ b/cern-root-loader/src/commonMain/kotlin/ru/mipt/npm/root/serialization/jsonToRoot.kt
@@ -118,7 +118,7 @@ private object RootDecoder {
             subclass(TGeoCompositeShape.serializer().unref(refCache))
             subclass(TGeoShapeAssembly.serializer().unref(refCache))
 
-            default {
+            defaultDeserializer {
                 if (it == null) {
                     TGeoShape.serializer().unref(refCache)
                 } else {
@@ -136,7 +136,7 @@ private object RootDecoder {
 
 
             val unrefed = TGeoMatrix.serializer().unref(refCache)
-            default {
+            defaultDeserializer {
                 if (it == null) {
                     unrefed
                 } else {
@@ -149,7 +149,7 @@ private object RootDecoder {
             subclass(TGeoVolumeAssembly.serializer().unref(refCache))
 
             val unrefed = TGeoVolume.serializer().unref(refCache)
-            default {
+            defaultDeserializer {
                 if (it == null) {
                     unrefed
                 } else {
@@ -163,7 +163,7 @@ private object RootDecoder {
             subclass(TGeoNodeOffset.serializer().unref(refCache))
 
             val unrefed = TGeoNode.serializer().unref(refCache)
-            default {
+            defaultDeserializer {
                 if (it == null) {
                     unrefed
                 } else {
diff --git a/demo/gdml/build.gradle.kts b/demo/gdml/build.gradle.kts
index 3ac3960a..c1e3be28 100644
--- a/demo/gdml/build.gradle.kts
+++ b/demo/gdml/build.gradle.kts
@@ -7,6 +7,7 @@ kscience {
     js {
         useCommonJs()
         browser {
+            binaries.executable()
             commonWebpackConfig {
                 cssSupport {
                     enabled.set(false)
@@ -27,7 +28,6 @@ kscience {
         implementation(projects.visionforgeThreejs)
         implementation(npm("react-file-drop", "3.0.6"))
     }
-    application()
 }
 
 //kotlin {
diff --git a/demo/js-playground/build.gradle.kts b/demo/js-playground/build.gradle.kts
index 3368c5ef..86935c51 100644
--- a/demo/js-playground/build.gradle.kts
+++ b/demo/js-playground/build.gradle.kts
@@ -4,13 +4,13 @@ plugins {
 
 kscience{
     useCoroutines()
-    application()
 }
 
 kotlin{
     js(IR){
         useCommonJs()
         browser {
+            binaries.executable()
             commonWebpackConfig {
                 cssSupport{
                     enabled.set(false)
diff --git a/demo/muon-monitor/build.gradle.kts b/demo/muon-monitor/build.gradle.kts
index 3d814223..2ea4d0eb 100644
--- a/demo/muon-monitor/build.gradle.kts
+++ b/demo/muon-monitor/build.gradle.kts
@@ -38,7 +38,6 @@ kscience {
         implementation(project(":visionforge-threejs"))
         //implementation(devNpm("webpack-bundle-analyzer", "4.4.0"))
     }
-    application()
 }
 
 application {
diff --git a/demo/playground/build.gradle.kts b/demo/playground/build.gradle.kts
index a2696fa6..ddc1d6a8 100644
--- a/demo/playground/build.gradle.kts
+++ b/demo/playground/build.gradle.kts
@@ -2,6 +2,7 @@ plugins {
     kotlin("multiplatform")
     kotlin("jupyter.api")
     id("com.github.johnrengelman.shadow") version "7.1.2"
+//    application
 }
 
 repositories {
@@ -29,6 +30,7 @@ kotlin {
     }
 
     jvm {
+//        withJava()
         compilations.all {
             kotlinOptions {
                 jvmTarget = "11"
@@ -88,4 +90,8 @@ val processJupyterApiResources by tasks.getting(org.jetbrains.kotlinx.jupyter.ap
     libraryProducers = listOf("space.kscience.visionforge.examples.VisionForgePlayGroundForJupyter")
 }
 
-tasks.findByName("shadowJar")?.dependsOn(processJupyterApiResources)
\ No newline at end of file
+tasks.findByName("shadowJar")?.dependsOn(processJupyterApiResources)
+
+//application{
+//    mainClass.set("space.kscience.visionforge.examples.ShapesKt")
+//}
\ No newline at end of file
diff --git a/demo/playground/notebooks/dynamic-demo.ipynb b/demo/playground/notebooks/dynamic-demo.ipynb
index 7200d15b..41289185 100644
--- a/demo/playground/notebooks/dynamic-demo.ipynb
+++ b/demo/playground/notebooks/dynamic-demo.ipynb
@@ -2,37 +2,73 @@
  "cells": [
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 1,
    "metadata": {
     "tags": [],
     "pycharm": {
      "is_executing": true
+    },
+    "ExecuteTime": {
+     "end_time": "2023-05-29T15:22:37.933397300Z",
+     "start_time": "2023-05-29T15:22:37.913872100Z"
     }
    },
    "outputs": [],
-   "source": [
-    "@file:DependsOn(\"../build/libs/playground-0.3.0-dev-4-all.jar\")"
-   ]
+   "source": []
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 3,
+   "metadata": {
+    "ExecuteTime": {
+     "end_time": "2023-05-29T15:22:50.486483300Z",
+     "start_time": "2023-05-29T15:22:50.457485500Z"
+    }
+   },
+   "outputs": [
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "Line_2.jupyter.kts (1:1 - 3) Unresolved reference: vf"
+     ]
+    }
+   ],
    "source": [
     "vf.startServer()"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 4,
    "metadata": {
     "collapsed": false,
     "jupyter": {
      "outputs_hidden": false
+    },
+    "ExecuteTime": {
+     "end_time": "2023-05-29T15:22:51.410680600Z",
+     "start_time": "2023-05-29T15:22:51.250779400Z"
     }
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "Line_3.jupyter.kts (1:16 - 26) Unresolved reference: coroutines\n",
+      "Line_3.jupyter.kts (4:1 - 7) Unresolved reference: Plotly\n",
+      "Line_3.jupyter.kts (5:5 - 12) Unresolved reference: scatter\n",
+      "Line_3.jupyter.kts (6:9 - 10) Unresolved reference: x\n",
+      "Line_3.jupyter.kts (7:9 - 10) Unresolved reference: y\n",
+      "Line_3.jupyter.kts (8:12 - 14) Unresolved reference: vf\n",
+      "Line_3.jupyter.kts (9:13 - 15) Unresolved reference: vf\n",
+      "Line_3.jupyter.kts (10:23 - 31) Unresolved reference: isActive\n",
+      "Line_3.jupyter.kts (11:21 - 26) Unresolved reference: delay\n",
+      "Line_3.jupyter.kts (12:21 - 22) Unresolved reference: y"
+     ]
+    }
+   ],
    "source": [
     "import kotlinx.coroutines.*\n",
     "import kotlin.random.Random\n",
@@ -84,6 +120,9 @@
    "nbconvert_exporter": "",
    "pygments_lexer": "kotlin",
    "version": "1.8.0-dev-3517"
+  },
+  "ktnbPluginMetadata": {
+   "isAddProjectLibrariesToClasspath": false
   }
  },
  "nbformat": 4,
diff --git a/demo/playground/src/jvmMain/kotlin/shapes.kt b/demo/playground/src/jvmMain/kotlin/shapes.kt
new file mode 100644
index 00000000..bcd4f73a
--- /dev/null
+++ b/demo/playground/src/jvmMain/kotlin/shapes.kt
@@ -0,0 +1,39 @@
+package space.kscience.visionforge.examples
+
+import kotlin.math.PI
+import space.kscience.visionforge.Colors
+import space.kscience.visionforge.solid.*
+
+fun main() = makeVisionFile{
+    vision("canvas") {
+        solid {
+            ambientLight()
+            box(100.0, 100.0, 100.0) {
+                z = -110.0
+                color.set("teal")
+            }
+            sphere(50.0) {
+                x = 110
+                detail = 16
+                color.set("red")
+            }
+            tube(50, height = 10, innerRadius = 25, angle = PI) {
+                y = 110
+                detail = 16
+                rotationX = PI / 4
+                color.set("blue")
+            }
+            sphereLayer(50, 40, theta = PI / 2) {
+                rotationX = -PI * 3 / 4
+                z = 110
+                color.set(Colors.pink)
+            }
+
+
+            tube(30,20, 20){
+                detail = 31
+                y = - 220
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/demo/sat-demo/build.gradle.kts b/demo/sat-demo/build.gradle.kts
index 1b37bfad..6afadf27 100644
--- a/demo/sat-demo/build.gradle.kts
+++ b/demo/sat-demo/build.gradle.kts
@@ -8,7 +8,6 @@ kscience {
 //    useSerialization {
 //        json()
 //    }
-    application()
     dependencies{
         implementation(projects.visionforgeThreejs.visionforgeThreejsServer)
         implementation("ch.qos.logback:logback-classic:1.4.5")
diff --git a/demo/sat-demo/src/main/kotlin/ru/mipt/npm/sat/satServer.kt b/demo/sat-demo/src/main/kotlin/ru/mipt/npm/sat/satServer.kt
index d2c33c2c..4f0ff70c 100644
--- a/demo/sat-demo/src/main/kotlin/ru/mipt/npm/sat/satServer.kt
+++ b/demo/sat-demo/src/main/kotlin/ru/mipt/npm/sat/satServer.kt
@@ -3,8 +3,7 @@ package ru.mipt.npm.sat
 
 import io.ktor.server.cio.CIO
 import io.ktor.server.engine.embeddedServer
-import io.ktor.server.http.content.resources
-import io.ktor.server.http.content.static
+import io.ktor.server.http.content.staticResources
 import io.ktor.server.routing.routing
 import kotlinx.coroutines.*
 import kotlinx.html.div
@@ -41,9 +40,7 @@ fun main() {
 
     val server = embeddedServer(CIO, connector.port, connector.host) {
         routing {
-            static {
-                resources()
-            }
+            staticResources("", null, null)
         }
 
         visionPage(
diff --git a/demo/solid-showcase/build.gradle.kts b/demo/solid-showcase/build.gradle.kts
index 0a53b4e2..d588e035 100644
--- a/demo/solid-showcase/build.gradle.kts
+++ b/demo/solid-showcase/build.gradle.kts
@@ -1,11 +1,11 @@
 plugins {
     id("space.kscience.gradle.mpp")
+    `maven-publish`
     application
 }
 
 kscience {
     useCoroutines()
-    application()
     jvm {
         withJava()
     }
@@ -22,4 +22,8 @@ kscience {
 
 application {
     mainClass.set("space.kscience.visionforge.solid.demo.FXDemoAppKt")
+}
+
+kotlin{
+    explicitApi = null
 }
\ No newline at end of file
diff --git a/demo/solid-showcase/src/commonMain/kotlin/space/kscience/visionforge/solid/demo/VisionLayout.kt b/demo/solid-showcase/src/commonMain/kotlin/space/kscience/visionforge/solid/demo/VisionLayout.kt
index 9b8c6b98..4b5bdf53 100644
--- a/demo/solid-showcase/src/commonMain/kotlin/space/kscience/visionforge/solid/demo/VisionLayout.kt
+++ b/demo/solid-showcase/src/commonMain/kotlin/space/kscience/visionforge/solid/demo/VisionLayout.kt
@@ -5,8 +5,8 @@ import space.kscience.dataforge.names.Name
 import space.kscience.visionforge.Vision
 import space.kscience.visionforge.solid.Solids
 
-public interface VisionLayout<in V: Vision> {
+interface VisionLayout<in V: Vision> {
     val solids: Solids
 
-    public fun render(name: Name, vision: V, meta: Meta = Meta.EMPTY)
+    fun render(name: Name, vision: V, meta: Meta = Meta.EMPTY)
 }
\ No newline at end of file
diff --git a/gradle.properties b/gradle.properties
index 75046b66..e3a218ba 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -6,5 +6,5 @@ kotlin.incremental.js.ir=true
 org.gradle.parallel=true
 org.gradle.jvmargs=-Xmx4G
 
-toolsVersion=0.14.8-kotlin-1.8.20
+toolsVersion=0.14.9-kotlin-1.8.20
 org.jetbrains.compose.experimental.jscanvas.enabled=true
\ No newline at end of file
diff --git a/ui/compose/src/jsMain/kotlin/space/kscience/visionforge/compose/ThreeJS.kt b/ui/compose/src/jsMain/kotlin/space/kscience/visionforge/compose/ThreeJS.kt
new file mode 100644
index 00000000..6033c712
--- /dev/null
+++ b/ui/compose/src/jsMain/kotlin/space/kscience/visionforge/compose/ThreeJS.kt
@@ -0,0 +1,11 @@
+package space.kscience.visionforge.compose
+
+import androidx.compose.material.Surface
+import androidx.compose.runtime.Composable
+
+@Composable
+public fun ThreeJs(){
+    Surface {
+        
+    }
+}
\ No newline at end of file
diff --git a/visionforge-core/build.gradle.kts b/visionforge-core/build.gradle.kts
index 218a1710..f2cac4c6 100644
--- a/visionforge-core/build.gradle.kts
+++ b/visionforge-core/build.gradle.kts
@@ -4,26 +4,24 @@ plugins {
 
 val dataforgeVersion: String by rootProject.extra
 
-kscience{
+kscience {
     jvm()
     js()
     native()
+    useCoroutines()
     dependencies {
         api("space.kscience:dataforge-context:$dataforgeVersion")
         api(spclibs.kotlinx.html)
 //        api("org.jetbrains.kotlin-wrappers:kotlin-css")
     }
-    testDependencies {
-        implementation("org.jetbrains.kotlinx:kotlinx-coroutines-test:${space.kscience.gradle.KScienceVersions.coroutinesVersion}")
-    }
-    dependencies(jsMain){
+    jsMain {
         api("org.jetbrains.kotlin-wrappers:kotlin-extensions")
     }
-    useSerialization{
+    useSerialization {
         json()
     }
 }
 
-readme{
+readme {
     maturity = space.kscience.gradle.Maturity.DEVELOPMENT
 }
\ No newline at end of file
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 46266988..2be8a6b3 100644
--- a/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/VisionManager.kt
+++ b/visionforge-core/src/commonMain/kotlin/space/kscience/visionforge/VisionManager.kt
@@ -70,7 +70,7 @@ public class VisionManager(meta: Meta) : AbstractPlugin(meta), MutableVisionCont
 
         private val defaultSerialModule: SerializersModule = SerializersModule {
             polymorphic(Vision::class) {
-                default { SimpleVisionGroup.serializer() }
+                defaultDeserializer { SimpleVisionGroup.serializer() }
                 subclass(NullVision.serializer())
                 subclass(SimpleVisionGroup.serializer())
                 subclass(VisionOfNumberField.serializer())
diff --git a/visionforge-core/src/commonTest/kotlin/space/kscience/visionforge/meta/VisionPropertyTest.kt b/visionforge-core/src/commonTest/kotlin/space/kscience/visionforge/meta/VisionPropertyTest.kt
index 6e113f7f..e9a0685e 100644
--- a/visionforge-core/src/commonTest/kotlin/space/kscience/visionforge/meta/VisionPropertyTest.kt
+++ b/visionforge-core/src/commonTest/kotlin/space/kscience/visionforge/meta/VisionPropertyTest.kt
@@ -94,7 +94,7 @@ internal class VisionPropertyTest {
     }
 
     @Test
-    fun testChildrenPropertyFlow() = runTest(dispatchTimeoutMs = 200) {
+    fun testChildrenPropertyFlow() = runTest(timeout = 200.milliseconds) {
         val group = Global.request(VisionManager).group {
 
             properties {
diff --git a/visionforge-markdown/build.gradle.kts b/visionforge-markdown/build.gradle.kts
index 9790bf1a..36559a09 100644
--- a/visionforge-markdown/build.gradle.kts
+++ b/visionforge-markdown/build.gradle.kts
@@ -10,8 +10,9 @@ kscience {
         binaries.library()
     }
     dependencies {
-        api(project(":visionforge-core"))
+        api(projects.visionforgeCore)
         api("org.jetbrains:markdown:$markdownVersion")
+        api("org.jetbrains:annotations:24.0.0")
     }
     useSerialization()
 }
\ No newline at end of file
diff --git a/visionforge-markdown/src/commonMain/kotlin/space/kscience/visionforge/markup/MarkupPlugin.kt b/visionforge-markdown/src/commonMain/kotlin/space/kscience/visionforge/markup/MarkupPlugin.kt
index 7ff98f91..3508ba8b 100644
--- a/visionforge-markdown/src/commonMain/kotlin/space/kscience/visionforge/markup/MarkupPlugin.kt
+++ b/visionforge-markdown/src/commonMain/kotlin/space/kscience/visionforge/markup/MarkupPlugin.kt
@@ -1,5 +1,8 @@
 package space.kscience.visionforge.markup
 
+import space.kscience.dataforge.context.PluginFactory
 import space.kscience.visionforge.VisionPlugin
 
-public expect class MarkupPlugin: VisionPlugin
\ No newline at end of file
+public expect class MarkupPlugin: VisionPlugin{
+    public companion object : PluginFactory<MarkupPlugin>
+}
\ No newline at end of file
diff --git a/visionforge-markdown/src/commonMain/kotlin/space/kscience/visionforge/markup/VisionOfMarkup.kt b/visionforge-markdown/src/commonMain/kotlin/space/kscience/visionforge/markup/VisionOfMarkup.kt
index ace39d2b..f3e255df 100644
--- a/visionforge-markdown/src/commonMain/kotlin/space/kscience/visionforge/markup/VisionOfMarkup.kt
+++ b/visionforge-markdown/src/commonMain/kotlin/space/kscience/visionforge/markup/VisionOfMarkup.kt
@@ -10,6 +10,8 @@ import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.asName
 import space.kscience.visionforge.AbstractVision
 import space.kscience.visionforge.Vision
+import space.kscience.visionforge.VisionBuilder
+import space.kscience.visionforge.html.VisionOutput
 import space.kscience.visionforge.root
 
 @Serializable
@@ -38,4 +40,16 @@ internal val markupSerializersModule = SerializersModule {
     polymorphic(Vision::class) {
         subclass(VisionOfMarkup.serializer())
     }
+}
+
+/**
+ * Embed a dynamic markdown block in a vision
+ */
+@VisionBuilder
+public inline fun VisionOutput.markdown(
+    format: String = VisionOfMarkup.COMMONMARK_FORMAT,
+    block: VisionOfMarkup.() -> Unit,
+): VisionOfMarkup {
+    requirePlugin(MarkupPlugin)
+    return VisionOfMarkup(format).apply(block)
 }
\ No newline at end of file
diff --git a/visionforge-markdown/src/jsMain/kotlin/space/kscience/visionforge/markup/MarkupPlugin.kt b/visionforge-markdown/src/jsMain/kotlin/space/kscience/visionforge/markup/MarkupPlugin.kt
index 08705c27..e79908f0 100644
--- a/visionforge-markdown/src/jsMain/kotlin/space/kscience/visionforge/markup/MarkupPlugin.kt
+++ b/visionforge-markdown/src/jsMain/kotlin/space/kscience/visionforge/markup/MarkupPlugin.kt
@@ -44,7 +44,7 @@ public actual class MarkupPlugin : VisionPlugin(), ElementVisionRenderer {
         element.append(div)
     }
 
-    public companion object : PluginFactory<MarkupPlugin> {
+    public actual companion object : PluginFactory<MarkupPlugin> {
         override val tag: PluginTag = PluginTag("vision.markup", PluginTag.DATAFORGE_GROUP)
 
         override fun build(context: Context, meta: Meta): MarkupPlugin  = MarkupPlugin()
diff --git a/visionforge-markdown/src/jvmMain/kotlin/space/kscience/visionforge/markup/MarkupPlugin.kt b/visionforge-markdown/src/jvmMain/kotlin/space/kscience/visionforge/markup/MarkupPlugin.kt
index de71725c..16cb6b24 100644
--- a/visionforge-markdown/src/jvmMain/kotlin/space/kscience/visionforge/markup/MarkupPlugin.kt
+++ b/visionforge-markdown/src/jvmMain/kotlin/space/kscience/visionforge/markup/MarkupPlugin.kt
@@ -1,6 +1,7 @@
 package space.kscience.visionforge.markup
 
 import kotlinx.serialization.modules.SerializersModule
+import org.intellij.lang.annotations.Language
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.context.PluginFactory
 import space.kscience.dataforge.context.PluginTag
@@ -12,10 +13,14 @@ public actual class MarkupPlugin : VisionPlugin() {
 
     override val tag: PluginTag get() = Companion.tag
 
-    public companion object : PluginFactory<MarkupPlugin> {
+    public actual companion object : PluginFactory<MarkupPlugin> {
         override val tag: PluginTag = PluginTag("vision.plotly", PluginTag.DATAFORGE_GROUP)
 
         override fun build(context: Context, meta: Meta): MarkupPlugin = MarkupPlugin()
 
     }
+}
+
+public fun VisionOfMarkup.content(@Language("markdown") text: String) {
+    content = text
 }
\ No newline at end of file
diff --git a/visionforge-plotly/src/commonMain/kotlin/space/kscience/visionforge/plotly/VisionOfPlotly.kt b/visionforge-plotly/src/commonMain/kotlin/space/kscience/visionforge/plotly/VisionOfPlotly.kt
index 54ba4551..10baa4ab 100644
--- a/visionforge-plotly/src/commonMain/kotlin/space/kscience/visionforge/plotly/VisionOfPlotly.kt
+++ b/visionforge-plotly/src/commonMain/kotlin/space/kscience/visionforge/plotly/VisionOfPlotly.kt
@@ -16,6 +16,7 @@ import space.kscience.plotly.Plot
 import space.kscience.plotly.Plotly
 import space.kscience.visionforge.MutableVisionProperties
 import space.kscience.visionforge.Vision
+import space.kscience.visionforge.VisionBuilder
 import space.kscience.visionforge.html.VisionOutput
 
 @Serializable
@@ -82,7 +83,10 @@ public class VisionOfPlotly private constructor(
 
 public fun Plot.asVision(): VisionOfPlotly = VisionOfPlotly(this)
 
-@DFExperimental
+/**
+ * Embed a dynamic plotly plot in a vision
+ */
+@VisionBuilder
 public inline fun VisionOutput.plotly(
     block: Plot.() -> Unit,
 ): VisionOfPlotly {
diff --git a/visionforge-solid/build.gradle.kts b/visionforge-solid/build.gradle.kts
index 5eb92323..a1d4fbc4 100644
--- a/visionforge-solid/build.gradle.kts
+++ b/visionforge-solid/build.gradle.kts
@@ -9,12 +9,10 @@ kscience {
     useSerialization {
         json()
     }
+    useCoroutines()
     dependencies {
         api(projects.visionforgeCore)
     }
-    testDependencies {
-        implementation(spclibs.kotlinx.coroutines.test)
-    }
     dependencies(jvmTest) {
         implementation(spclibs.logback.classic)
     }
diff --git a/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/ConeSegment.kt b/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/ConeSegment.kt
index 873ae44e..6e2677af 100644
--- a/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/ConeSegment.kt
+++ b/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/ConeSegment.kt
@@ -18,42 +18,54 @@ public class ConeSegment(
     public val bottomRadius: Float,
     public val height: Float,
     public val topRadius: Float,
-    public val startAngle: Float = 0f,
-    public val angle: Float = PI2
+    public val phiStart: Float = 0f,
+    public val phi: Float = PI2,
 ) : SolidBase<ConeSegment>(), GeometrySolid {
 
-    override fun <T : Any> toGeometry(geometryBuilder: GeometryBuilder<T>) {
-        val segments = detail ?: 32
-        require(segments >= 4) { "The number of segments in cone segment is too small" }
-        val angleStep = angle / (segments - 1)
+    init {
+        require(bottomRadius > 0) { "Bottom radius must be positive" }
+        require(topRadius > 0) { "Top radius must be positive" }
+    }
 
-        fun shape(r: Float, z: Float): List<Point3D> {
-            return (0 until segments).map { i ->
-                Point3D(r * cos(startAngle + angleStep * i), r * sin(startAngle + angleStep * i), z)
-            }
+    override fun <T : Any> toGeometry(geometryBuilder: GeometryBuilder<T>) {
+
+        val segments: Int = detail ?: 32
+        require(segments >= 4) { "The number of segments in cone segment is too small" }
+
+        val angleStep = phi / (segments - 1)
+
+        /**
+         * Top and bottom shape
+         */
+        fun shape(r: Float, z: Float): List<Point3D> = (0 until segments).map { i ->
+            Point3D(r * cos(phiStart + angleStep * i), r * sin(phiStart + angleStep * i), z)
         }
 
-        geometryBuilder.apply {
+        with(geometryBuilder) {
+
+            // top and bottom faces
+            val bottomOuterPoints: List<Point3D> = shape(topRadius, -height / 2)
+            val upperOuterPoints: List<Point3D> = shape(bottomRadius, height / 2)
 
-            //creating shape in x-y plane with z = 0
-            val bottomOuterPoints = shape(topRadius, -height / 2)
-            val upperOuterPoints = shape(bottomRadius, height / 2)
             //outer face
-            (1 until segments).forEach {
+            for (it in 1 until segments) {
                 face4(bottomOuterPoints[it - 1], bottomOuterPoints[it], upperOuterPoints[it], upperOuterPoints[it - 1])
             }
 
-            if (angle == PI2) {
+            //if the cone is closed
+            if (phi == PI2) {
                 face4(bottomOuterPoints.last(), bottomOuterPoints[0], upperOuterPoints[0], upperOuterPoints.last())
             }
 
-            val zeroBottom = Point3D(0f, 0f, 0f)
-            val zeroTop = Point3D(0f, 0f, height)
-            (1 until segments).forEach {
+            //top and bottom cups
+            val zeroBottom = Point3D(0f, 0f, -height / 2)
+            val zeroTop = Point3D(0f, 0f, height / 2)
+            for (it in 1 until segments) {
                 face(bottomOuterPoints[it - 1], zeroBottom, bottomOuterPoints[it])
                 face(upperOuterPoints[it - 1], upperOuterPoints[it], zeroTop)
             }
-            if (angle == PI2) {
+            // closed surface
+            if (phi == PI2) {
                 face(bottomOuterPoints.last(), zeroBottom, bottomOuterPoints[0])
                 face(upperOuterPoints.last(), upperOuterPoints[0], zeroTop)
             } else {
@@ -71,7 +83,7 @@ public inline fun MutableVisionContainer<Solid>.cylinder(
     r: Number,
     height: Number,
     name: String? = null,
-    block: ConeSegment.() -> Unit = {}
+    block: ConeSegment.() -> Unit = {},
 ): ConeSegment = ConeSegment(
     r.toFloat(),
     height.toFloat(),
@@ -86,11 +98,11 @@ public inline fun MutableVisionContainer<Solid>.cone(
     startAngle: Number = 0f,
     angle: Number = PI2,
     name: String? = null,
-    block: ConeSegment.() -> Unit = {}
+    block: ConeSegment.() -> Unit = {},
 ): ConeSegment = ConeSegment(
     bottomRadius.toFloat(),
     height.toFloat(),
     topRadius = upperRadius.toFloat(),
-    startAngle = startAngle.toFloat(),
-    angle = angle.toFloat()
+    phiStart = startAngle.toFloat(),
+    phi = angle.toFloat()
 ).apply(block).also { setChild(name, it) }
\ No newline at end of file
diff --git a/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/ConeSurface.kt b/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/ConeSurface.kt
index 0bc023e6..2a6bcdc5 100644
--- a/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/ConeSurface.kt
+++ b/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/ConeSurface.kt
@@ -38,10 +38,8 @@ public class ConeSurface(
         require(segments >= 4) { "The number of segments in tube is too small" }
         val angleStep = angle / (segments - 1)
 
-        fun shape(r: Float, z: Float): List<Point3D> {
-            return (0 until segments).map { i ->
-                Point3D(r * cos(startAngle + angleStep * i), r * sin(startAngle + angleStep * i), z)
-            }
+        fun shape(r: Float, z: Float): List<Point3D> = (0 until segments).map { i ->
+            Point3D(r * cos(startAngle + angleStep * i), r * sin(startAngle + angleStep * i), z)
         }
 
         geometryBuilder.apply {
@@ -50,7 +48,7 @@ public class ConeSurface(
             val bottomOuterPoints = shape(bottomRadius, -height / 2)
             val topOuterPoints = shape(topRadius, height / 2)
             //outer face
-            (1 until segments).forEach {
+            for (it in 1 until segments) {
                 face4(bottomOuterPoints[it - 1], bottomOuterPoints[it], topOuterPoints[it], topOuterPoints[it - 1])
             }
 
diff --git a/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/Solids.kt b/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/Solids.kt
index 38d214bd..1fecd450 100644
--- a/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/Solids.kt
+++ b/visionforge-solid/src/commonMain/kotlin/space/kscience/visionforge/solid/Solids.kt
@@ -44,6 +44,7 @@ public class Solids(meta: Meta) : VisionPlugin(meta), MutableVisionContainer<Sol
             subclass(PolyLine.serializer())
             subclass(SolidLabel.serializer())
             subclass(Sphere.serializer())
+            subclass(SphereLayer.serializer())
 
             subclass(AmbientLightSource.serializer())
             subclass(PointLightSource.serializer())
@@ -56,7 +57,7 @@ public class Solids(meta: Meta) : VisionPlugin(meta), MutableVisionContainer<Sol
             }
 
             polymorphic(Solid::class) {
-                default { SolidBase.serializer(serializer<Solid>()) }
+                defaultDeserializer { SolidBase.serializer(serializer<Solid>()) }
                 solids()
             }
         }
diff --git a/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeConeFactory.kt b/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeConeFactory.kt
index acb81e1f..6b2db845 100644
--- a/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeConeFactory.kt
+++ b/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreeConeFactory.kt
@@ -18,16 +18,16 @@ public object ThreeConeFactory : ThreeMeshFactory<ConeSegment>(ConeSegment::clas
                 radialSegments = segments,
                 heightSegments = segments,
                 openEnded = false,
-                thetaStart = obj.startAngle,
-                thetaLength = obj.angle
+                thetaStart = obj.phiStart,
+                thetaLength = obj.phi
             )
         } ?: CylinderGeometry(
             radiusTop = obj.topRadius,
             radiusBottom = obj.bottomRadius,
             height = obj.height,
             openEnded = false,
-            thetaStart = obj.startAngle,
-            thetaLength = obj.angle
+            thetaStart = obj.phiStart,
+            thetaLength = obj.phi
         )
         return cylinder.rotateX(PI/2)
     }
diff --git a/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreePlugin.kt b/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreePlugin.kt
index 0a2d9f2a..1913e332 100644
--- a/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreePlugin.kt
+++ b/visionforge-threejs/src/main/kotlin/space/kscience/visionforge/solid/three/ThreePlugin.kt
@@ -111,7 +111,7 @@ public class ThreePlugin : AbstractPlugin(), ElementVisionRenderer {
 
         is Composite -> compositeFactory.build(this, vision, observe)
         else -> {
-            //find specialized factory for this type if it is present
+            //find a specialized factory for this type if it is present
             val factory: ThreeFactory<Solid>? = findObjectFactory(vision::class)
             when {
                 factory != null -> factory.build(this, vision, observe)