diff --git a/build.gradle b/build.gradle
index 9a1c135a..6aa4ff60 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,24 +1,26 @@
-def openrndrUseSnapshot = false
-
 buildscript {
     repositories {
         jcenter()
     }
     dependencies {
         classpath "org.jetbrains.dokka:dokka-gradle-plugin:0.9.17"
-        classpath "com.netflix.nebula:nebula-kotlin-plugin:1.3.72"
-        classpath "com.netflix.nebula:nebula-publishing-plugin:17.0.5"
-        classpath "com.netflix.nebula:nebula-release-plugin:14.1.0"
+        classpath "com.netflix.nebula:nebula-publishing-plugin:17.3.0"
+        classpath "com.netflix.nebula:nebula-release-plugin:15.1.0"
         classpath "com.github.ben-manes:gradle-versions-plugin:0.28.0"
     }
 }
+plugins {
+    id 'org.jetbrains.kotlin.jvm' version '1.4.0'
+}
+
+def openrndrUseSnapshot = false
 
 apply plugin: 'org.jetbrains.dokka'
 
 project.ext {
-    openrndrVersion = openrndrUseSnapshot? "0.4.0-SNAPSHOT" : "0.3.44-rc.8"
-    kotlinVersion = "1.3.72"
-    spekVersion = "2.0.11"
+    openrndrVersion = openrndrUseSnapshot? "0.4.0-SNAPSHOT" : "0.3.44-rc.10"
+    kotlinVersion = "1.4.0"
+    spekVersion = "2.0.12"
     libfreenectVersion = "0.5.7-1.5.3"
     gsonVersion = "2.8.6"
     antlrVersion = "4.8-1"
@@ -47,7 +49,7 @@ dokka {
 allprojects {
     apply plugin: 'idea'
     apply plugin: 'java'
-    apply plugin: 'nebula.kotlin'
+    apply plugin: 'kotlin'
     apply plugin: 'nebula.contacts'
     apply plugin: 'nebula.info'
     apply plugin: 'nebula.release'
@@ -75,11 +77,12 @@ allprojects {
     }
 
     dependencies {
+        implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlinVersion"
         implementation 'io.github.microutils:kotlin-logging:1.7.9'
         implementation "org.openrndr:openrndr-core:$openrndrVersion"
         implementation "org.openrndr:openrndr-filter:$openrndrVersion"
         implementation "org.openrndr:openrndr-shape:$openrndrVersion"
-        implementation group: 'org.jetbrains.kotlinx', name: 'kotlinx-coroutines-core', version: '1.3.6'
+        implementation group: 'org.jetbrains.kotlinx', name: 'kotlinx-coroutines-core', version: '1.3.9'
         testImplementation "org.spekframework.spek2:spek-dsl-jvm:$spekVersion"
         testImplementation "org.amshove.kluent:kluent:1.61"
         testImplementation "org.jetbrains.kotlin:kotlin-test:$kotlinVersion"
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index fb15f8de..a8cf03eb 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.4-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.6-all.zip
diff --git a/openrndr-demos/build.gradle b/openrndr-demos/build.gradle
index 827bff2d..c6c17587 100644
--- a/openrndr-demos/build.gradle
+++ b/openrndr-demos/build.gradle
@@ -13,6 +13,7 @@ dependencies {
     demoImplementation(project(":orx-camera"))
     demoImplementation(project(":orx-parameters"))
     demoImplementation(project(":orx-noise"))
+    demoImplementation(project(":orx-gui"))
     demoImplementation(project(":orx-shader-phrases"))
     demoImplementation("org.slf4j:slf4j-simple:1.7.30")
 
diff --git a/orx-boofcv/src/main/kotlin/Binding.kt b/orx-boofcv/src/main/kotlin/Binding.kt
index c2f5159b..2df3defb 100644
--- a/orx-boofcv/src/main/kotlin/Binding.kt
+++ b/orx-boofcv/src/main/kotlin/Binding.kt
@@ -70,9 +70,9 @@ fun ColorBuffer.toPlanarU8() : Planar<GrayU8> {
     for (y in 0 until height) {
         for (x in 0 until width) {
             val c = shadow.read(x, y)
-            bands[0].data[offset] = (c.r * 255).toByte()
-            bands[1].data[offset] = (c.g * 255).toByte()
-            bands[2].data[offset] = (c.b * 255).toByte()
+            bands[0].data[offset] = (c.r * 255).toInt().toByte()
+            bands[1].data[offset] = (c.g * 255).toInt().toByte()
+            bands[2].data[offset] = (c.b * 255).toInt().toByte()
             offset++
         }
     }
diff --git a/orx-boofcv/src/main/kotlin/MatrixConversion.kt b/orx-boofcv/src/main/kotlin/MatrixConversion.kt
new file mode 100644
index 00000000..dc569b79
--- /dev/null
+++ b/orx-boofcv/src/main/kotlin/MatrixConversion.kt
@@ -0,0 +1,19 @@
+package org.openrndr.boofcv.binding
+
+import georegression.struct.affine.Affine2D_F32
+import georegression.struct.affine.Affine2D_F64
+import org.openrndr.math.Matrix44
+
+fun Affine2D_F32.toMatrix44() = Matrix44(
+        c0r0 = a11.toDouble(), c1r0 = a12.toDouble(), c3r0 = tx.toDouble(),
+        c0r1 = a21.toDouble(), c1r1 = a22.toDouble(), c3r1 = ty.toDouble(),
+        c2r2 = 1.0,
+        c3r3 = 1.0
+)
+
+fun Affine2D_F64.toMatrix44() = Matrix44(
+        c0r0 = a11, c1r0 = a12, c3r0 = tx,
+        c0r1 = a21, c1r1 = a22, c3r1 = ty,
+        c2r2 = 1.0,
+        c3r3 = 1.0
+)
\ No newline at end of file
diff --git a/orx-compositor/src/main/kotlin/Compositor.kt b/orx-compositor/src/main/kotlin/Compositor.kt
index 8c25e6c6..95067e16 100644
--- a/orx-compositor/src/main/kotlin/Compositor.kt
+++ b/orx-compositor/src/main/kotlin/Compositor.kt
@@ -172,7 +172,7 @@ open class Layer internal constructor() {
                 localBlendFilter.first.apply(arrayOf(activeRenderTarget.colorBuffer(0), layerPost), activeRenderTarget.colorBuffer(0))
             }
 
-            accumulation?.resolveTo(target.colorBuffer(0))
+            accumulation?.copyTo(target.colorBuffer(0))
         }
     }
 
diff --git a/orx-dnk3/build.gradle b/orx-dnk3/build.gradle
index 0b69e02e..88db1f1f 100644
--- a/orx-dnk3/build.gradle
+++ b/orx-dnk3/build.gradle
@@ -17,9 +17,12 @@ dependencies {
 
     demoImplementation(project(":orx-camera"))
     demoImplementation(project(":orx-mesh-generators"))
+    demoImplementation(project(":orx-noise"))
+
     demoImplementation("org.openrndr:openrndr-core:$openrndrVersion")
     demoImplementation("org.openrndr:openrndr-extensions:$openrndrVersion")
     demoImplementation("org.openrndr:openrndr-ffmpeg:$openrndrVersion")
+
     demoRuntimeOnly("org.openrndr:openrndr-gl3:$openrndrVersion")
     demoRuntimeOnly("org.openrndr:openrndr-gl3-natives-$openrndrOS:$openrndrVersion")
     demoImplementation(sourceSets.getByName("main").output)
diff --git a/orx-dnk3/src/demo/kotlin/DemoDSL02.kt b/orx-dnk3/src/demo/kotlin/DemoDSL02.kt
new file mode 100644
index 00000000..82fc9e55
--- /dev/null
+++ b/orx-dnk3/src/demo/kotlin/DemoDSL02.kt
@@ -0,0 +1,87 @@
+import org.openrndr.application
+import org.openrndr.color.ColorRGBa
+import org.openrndr.extensions.SingleScreenshot
+import org.openrndr.extra.dnk3.dsl.*
+import org.openrndr.extra.dnk3.renderers.dryRenderer
+import org.openrndr.extra.dnk3.tools.addSkybox
+import org.openrndr.extra.noise.simplex
+import org.openrndr.extras.camera.Orbital
+import org.openrndr.extras.meshgenerators.groundPlaneMesh
+import org.openrndr.math.Vector3
+import org.openrndr.math.transforms.transform
+import org.openrndr.shape.path3D
+
+fun main() = application {
+    configure {
+        width = 1280
+        height = 720
+    }
+
+    program {
+        if (System.getProperty("takeScreenshot") == "true") {
+            extend(SingleScreenshot()) {
+                this.outputFile = System.getProperty("screenshotPath")
+            }
+        }
+        extend(Orbital()) {
+            eye = Vector3(4.0, 4.0, 4.0)
+        }
+
+        val renderer = dryRenderer()
+        val scene = scene {
+
+            addSkybox("file:demo-data/cubemaps/garage_iem.dds")
+
+            root.hemisphereLight {
+                upColor = ColorRGBa.WHITE.shade(0.1)
+                downColor = ColorRGBa.BLACK
+            }
+
+            root.node {
+                transform = transform {
+                    translate(0.0, 2.0, 0.0)
+                }
+
+                pointLight {
+                    constantAttenuation = 0.0
+                    quadraticAttenuation = 1.0
+                }
+            }
+
+            root.node {
+                simpleMesh {
+                    vertexBuffer = groundPlaneMesh(100.0, 100.0)
+                    material = pbrMaterial {
+                        color = ColorRGBa.GREEN
+                    }
+                }
+            }
+
+            root.node {
+                pathMesh {
+                    weight = 10.0
+                    material = pbrMaterial {
+                        color = ColorRGBa.PINK
+                    }
+                    update {
+                        paths = mutableListOf(
+                                path3D {
+                                    val t = seconds * 0.1
+                                    moveTo(Vector3.ZERO)
+                                    val control = Vector3.simplex(3032, t).let { it.copy(y = it.y * 0.5 + 0.5) } * 4.0
+                                    val target = Vector3.simplex(5077, t).let { it.copy(y = it.y * 0.5 + 0.5) } * 4.0
+                                    val end = Vector3.simplex(9041, t).let { it.copy(y = it.y * 0.5 + 0.5) } * 4.0
+                                    curveTo(control, target)
+                                    continueTo(end)
+                                }
+                        )
+                    }
+                }
+            }
+        }
+        extend {
+            drawer.clear(ColorRGBa.BLACK)
+            renderer.draw(drawer, scene)
+        }
+    }
+}
\ No newline at end of file
diff --git a/orx-dnk3/src/main/kotlin/Entity.kt b/orx-dnk3/src/main/kotlin/Entity.kt
index cedf8e55..e9ff407d 100644
--- a/orx-dnk3/src/main/kotlin/Entity.kt
+++ b/orx-dnk3/src/main/kotlin/Entity.kt
@@ -1,9 +1,12 @@
 package org.openrndr.extra.dnk3
 
 import org.openrndr.color.ColorRGBa
-import org.openrndr.draw.*
+import org.openrndr.draw.DrawPrimitive
+import org.openrndr.draw.IndexBuffer
+import org.openrndr.draw.VertexBuffer
 import org.openrndr.math.Matrix44
 import org.openrndr.math.transforms.perspective
+import org.openrndr.shape.Path3D
 
 
 class Geometry(val vertexBuffers: List<VertexBuffer>,
@@ -15,6 +18,7 @@ class Geometry(val vertexBuffers: List<VertexBuffer>,
     override fun toString(): String {
         return "Geometry(vertexBuffers: $vertexBuffers, indexBuffers: $indexBuffer, primitive: $primitive, offset: $offset, vertexCount: $vertexCount)"
     }
+
     override fun hashCode(): Int {
         var result = 0
         result = 31 * result + primitive.ordinal.hashCode()
@@ -41,11 +45,22 @@ class MeshPrimitive(var geometry: Geometry, var material: Material) {
 
 class MeshPrimitiveInstance(val primitive: MeshPrimitive, val instances: Int, val attributes: List<VertexBuffer>)
 
+class PathMesh(var paths: MutableList<Path3D>, var material: Material, var weight: Double) : Entity() {
+    override fun toString(): String {
+        return "PathMesh(paths=$paths)"
+    }
+
+    override fun hashCode(): Int {
+        return paths.hashCode()
+    }
+}
+
 abstract class MeshBase(var primitives: List<MeshPrimitive>) : Entity()
 class Mesh(primitives: List<MeshPrimitive>) : MeshBase(primitives) {
     override fun toString(): String {
         return "Mesh(primitives: $primitives)"
     }
+
     override fun hashCode(): Int {
         return primitives.hashCode()
     }
@@ -62,7 +77,7 @@ class InstancedMesh(primitives: List<MeshPrimitive>,
                     var attributes: List<VertexBuffer>) : MeshBase(primitives)
 
 
-data class Fog(var color: ColorRGBa = ColorRGBa.WHITE, var end : Double = 100.0) : Entity()
+data class Fog(var color: ColorRGBa = ColorRGBa.WHITE, var end: Double = 100.0) : Entity()
 
 abstract class Light : Entity() {
     var color: ColorRGBa = ColorRGBa.WHITE
@@ -75,14 +90,14 @@ abstract class Camera : Entity() {
 
 abstract class CubemapProbe : Entity() {
     open val projectionMatrix: Matrix44
-    get() {
-        return perspective(90.0, 1.0, 0.1, 150.0)
-    }
+        get() {
+            return perspective(90.0, 1.0, 0.1, 150.0)
+        }
     var dirty = true
 }
 
-class IrradianceProbe: CubemapProbe() {
-      override fun hashCode(): Int {
+class IrradianceProbe : CubemapProbe() {
+    override fun hashCode(): Int {
         return true.hashCode()
     }
 }
\ No newline at end of file
diff --git a/orx-dnk3/src/main/kotlin/PBRMaterial.kt b/orx-dnk3/src/main/kotlin/PBRMaterial.kt
index b94cb08f..8809f4e0 100644
--- a/orx-dnk3/src/main/kotlin/PBRMaterial.kt
+++ b/orx-dnk3/src/main/kotlin/PBRMaterial.kt
@@ -20,7 +20,7 @@ private val noise128 by lazy {
     for (y in 0 until cb.height) {
         for (x in 0 until cb.width) {
             for (i in 0 until 4)
-                buffer.put((Math.random() * 255).toByte())
+                buffer.put((Math.random() * 255).toInt().toByte())
         }
     }
     buffer.rewind()
diff --git a/orx-dnk3/src/main/kotlin/SceneRenderer.kt b/orx-dnk3/src/main/kotlin/SceneRenderer.kt
index c46318b5..b03b4e0d 100644
--- a/orx-dnk3/src/main/kotlin/SceneRenderer.kt
+++ b/orx-dnk3/src/main/kotlin/SceneRenderer.kt
@@ -13,11 +13,11 @@ class RenderContext(
         val meshes: List<NodeContent<Mesh>>,
         val skinnedMeshes: List<NodeContent<SkinnedMesh>>,
         val instancedMeshes: List<NodeContent<InstancedMesh>>,
+        val pathMeshes: List<NodeContent<PathMesh>>,
         val fogs: List<NodeContent<Fog>>
 )
 
 class SceneRenderer {
-
     class Configuration {
         var multisampleLines = false
     }
@@ -64,7 +64,8 @@ class SceneRenderer {
                 meshes = scene.root.findContent { this as? Mesh },
                 skinnedMeshes = scene.root.findContent { this as? SkinnedMesh },
                 fogs = scene.root.findContent { this as? Fog },
-                instancedMeshes = scene.root.findContent { this as? InstancedMesh }
+                instancedMeshes = scene.root.findContent { this as? InstancedMesh },
+                pathMeshes = scene.root.findContent { this as? PathMesh}
         )
 
         // shadow passes
@@ -140,7 +141,7 @@ class SceneRenderer {
                     pass.combiners.forEach {
                         if (it is ColorBufferFacetCombiner) {
                             val index = target.colorAttachmentIndexByName(it.targetOutput)
-                                    ?: error("attachement not found ${it.targetOutput}")
+                                    ?: error("attachment not found ${it.targetOutput}")
                             target.blendMode(index, it.blendMode)
                         }
                     }
@@ -305,7 +306,26 @@ class SceneRenderer {
                                 primitive.primitive.geometry.vertexCount)
                     }
                 }
-        drawer.depthWrite = true
+
+                context.pathMeshes.filter { (it.content.material.transparent && pass.renderTransparent) || (!it.content.material.transparent && pass.renderOpaque) }
+                .forEach {
+                    drawer.isolated {
+                        val primitiveContext = PrimitiveContext(true, false)
+                        val shadeStyle = it.content.material.generateShadeStyle(materialContext, primitiveContext)
+                        shadeStyle.parameter("viewMatrixInverse", drawer.view.inversed)
+                        it.content.material.applyToShadeStyle(materialContext, shadeStyle)
+                        drawer.drawStyle.cullTestPass = CullTestPass.ALWAYS
+                        drawer.shadeStyle = shadeStyle
+                        drawer.model = it.node.worldTransform
+                        drawer.strokeWeight = it.content.weight
+                        for (path in it.content.paths) {
+                            drawer.path(path.sampleLinear(0.0005))
+                        }
+                    }
+                }
+
+
+                drawer.depthWrite = true
     }
 }
 
diff --git a/orx-dnk3/src/main/kotlin/cubemap/CubemapFilter.kt b/orx-dnk3/src/main/kotlin/cubemap/CubemapFilter.kt
index b62aa011..93dbe60a 100644
--- a/orx-dnk3/src/main/kotlin/cubemap/CubemapFilter.kt
+++ b/orx-dnk3/src/main/kotlin/cubemap/CubemapFilter.kt
@@ -73,7 +73,7 @@ open class CubemapFilter(private val shader: Shader? = null, private val watcher
                 renderTarget.detachDepthBuffer()
             }
 
-            renderTarget.detachColorBuffers()
+            renderTarget.detachColorAttachments()
             renderTarget.destroy()
         }
     }
diff --git a/orx-dnk3/src/main/kotlin/dsl/SceneBuilder.kt b/orx-dnk3/src/main/kotlin/dsl/SceneBuilder.kt
index f678deb9..26b966c5 100644
--- a/orx-dnk3/src/main/kotlin/dsl/SceneBuilder.kt
+++ b/orx-dnk3/src/main/kotlin/dsl/SceneBuilder.kt
@@ -19,7 +19,7 @@ fun SceneNode.node(builder: SceneNode.() -> Unit): SceneNode {
     return node
 }
 
-fun SceneNode.hemisphereLight(builder: HemisphereLight.() -> Unit) : HemisphereLight {
+fun SceneNode.hemisphereLight(builder: HemisphereLight.() -> Unit): HemisphereLight {
     val hemisphereLight = HemisphereLight()
     hemisphereLight.builder()
     entities.add(hemisphereLight)
@@ -64,17 +64,25 @@ class SimpleMeshBuilder {
     }
 }
 
-fun Scene.update(function: ()->Unit) {
-    dispatcher.launch {
-        while (true) {
-            function()
-            yield()
-        }
-     }
-}
-
 fun SceneNode.simpleMesh(builder: SimpleMeshBuilder.() -> Unit): Mesh {
     val mesh = SimpleMeshBuilder().apply { builder() }.build()
     entities.add(mesh)
     return mesh
 }
+
+
+fun SceneNode.pathMesh(builder: PathMesh.() -> Unit): PathMesh {
+    val pathMesh = PathMesh(mutableListOf(), DummyMaterial(), 1.0)
+    pathMesh.builder()
+    entities.add(pathMesh)
+    return pathMesh
+}
+
+fun Scene.update(function: () -> Unit) {
+    dispatcher.launch {
+        while (true) {
+            function()
+            yield()
+        }
+    }
+}
diff --git a/orx-dnk3/src/main/kotlin/gltf/GltfScene.kt b/orx-dnk3/src/main/kotlin/gltf/GltfScene.kt
index bc763a9b..cc4a89f6 100644
--- a/orx-dnk3/src/main/kotlin/gltf/GltfScene.kt
+++ b/orx-dnk3/src/main/kotlin/gltf/GltfScene.kt
@@ -17,7 +17,7 @@ import kotlin.reflect.KMutableProperty0
 class SceneAnimation(var channels: List<AnimationChannel>) {
     val duration: Double
         get() {
-            return channels.maxBy { it.duration }?.duration ?: 0.0
+            return channels.maxByOrNull { it.duration }?.duration ?: 0.0
         }
     fun applyToTargets(input: Double) {
         for (channel in channels) {
diff --git a/orx-filter-extension/src/main/kotlin/FilterExtension.kt b/orx-filter-extension/src/main/kotlin/FilterExtension.kt
index b541605d..de9d6df0 100644
--- a/orx-filter-extension/src/main/kotlin/FilterExtension.kt
+++ b/orx-filter-extension/src/main/kotlin/FilterExtension.kt
@@ -22,7 +22,7 @@ fun <F : Filter> Program.extend(filter: F, configuration: F.() -> Unit = {}): Ex
             if (renderTarget == null || renderTarget?.width != program.width || renderTarget?.height != program.height) {
                 renderTarget?.let {
                     it.colorBuffer(0).destroy()
-                    it.detachColorBuffers()
+                    it.detachColorAttachments()
                     it.destroy()
                 }
 
diff --git a/orx-keyframer/src/main/kotlin/Keyframer.kt b/orx-keyframer/src/main/kotlin/Keyframer.kt
index fd803af4..ea4716fa 100644
--- a/orx-keyframer/src/main/kotlin/Keyframer.kt
+++ b/orx-keyframer/src/main/kotlin/Keyframer.kt
@@ -59,7 +59,7 @@ open class Keyframer {
     }
 
     val duration: Double
-        get() = channels.values.maxBy { it.duration() }?.duration() ?: 0.0
+        get() = channels.values.maxByOrNull { it.duration() }?.duration() ?: 0.0
 
 
     inner class DoubleChannel(key: String, defaultValue: Double = 0.0) :
diff --git a/orx-kotlin-parser/src/main/kotlin/TreeUtils.kt b/orx-kotlin-parser/src/main/kotlin/TreeUtils.kt
index a8443ac4..095bef48 100644
--- a/orx-kotlin-parser/src/main/kotlin/TreeUtils.kt
+++ b/orx-kotlin-parser/src/main/kotlin/TreeUtils.kt
@@ -22,7 +22,7 @@ object TreeUtils {
     }
 
     private fun process(t: Tree, ruleNames: List<String>): String {
-        if (t.getChildCount() === 0) return Utils.escapeWhitespace(Trees.getNodeText(t, ruleNames), false)
+        if (t.getChildCount() == 0) return Utils.escapeWhitespace(Trees.getNodeText(t, ruleNames), false)
         val sb = StringBuilder()
         sb.append(lead(level))
         level++
diff --git a/orx-mesh-generators/src/main/kotlin/Cap.kt b/orx-mesh-generators/src/main/kotlin/Cap.kt
index 47e8066b..7e9a37de 100644
--- a/orx-mesh-generators/src/main/kotlin/Cap.kt
+++ b/orx-mesh-generators/src/main/kotlin/Cap.kt
@@ -7,7 +7,7 @@ import org.openrndr.math.YPolarity
 import org.openrndr.math.transforms.rotateY
 
 fun generateCap(sides: Int, radius: Double, enveloppe: List<Vector2> = listOf(Vector2(0.0, 0.0), Vector2(1.0, 0.0)), writer: VertexWriter) {
-    val maxX = enveloppe.maxBy { it.x } ?: Vector2(1.0, 0.0)
+    val maxX = enveloppe.maxByOrNull { it.x } ?: Vector2(1.0, 0.0)
     val a = maxX.x
 
     val cleanEnveloppe = enveloppe.map { Vector2((it.x / a) * radius, it.y) }
@@ -51,7 +51,7 @@ fun generateCap(sides: Int, radius: Double, enveloppe: List<Vector2> = listOf(Ve
 }
 
 fun generateRevolve(sides: Int, length: Double, enveloppe: List<Vector2> = listOf(Vector2(1.0, 0.0), Vector2(1.0, 1.0)), writer: VertexWriter) {
-    val maxY = enveloppe.maxBy { it.y } ?: Vector2(0.0, 1.0)
+    val maxY = enveloppe.maxByOrNull { it.y } ?: Vector2(0.0, 1.0)
     val a = maxY.y
 
     val cleanEnveloppe = enveloppe.map { Vector2((it.x), (it.y/a - 0.5) * length ) }
@@ -62,8 +62,6 @@ fun generateRevolve(sides: Int, length: Double, enveloppe: List<Vector2> = listO
 
     }
 
-    val extended = listOf(normals2D[0]) + normals2D + normals2D[normals2D.size-1]
-
     val basePositions = cleanEnveloppe.map { Vector3(it.x, it.y, 0.0) }
     val baseNormals = normals2D.map { Vector3(it.x, it.y, 0.0) }
 
diff --git a/orx-mesh-generators/src/main/kotlin/GeneratorBuffer.kt b/orx-mesh-generators/src/main/kotlin/GeneratorBuffer.kt
index 408ff677..152eb1ab 100644
--- a/orx-mesh-generators/src/main/kotlin/GeneratorBuffer.kt
+++ b/orx-mesh-generators/src/main/kotlin/GeneratorBuffer.kt
@@ -32,8 +32,8 @@ class GeneratorBuffer {
     fun toByteBuffer(): ByteBuffer {
         val bb = ByteBuffer.allocateDirect(data.size * (3 * 4 + 3 * 4 + 2 * 4))
         bb.order(ByteOrder.nativeOrder())
-        bb.rewind()
         for (d in data) {
+        bb.rewind()
             bb.putFloat(d.position.x.toFloat())
             bb.putFloat(d.position.y.toFloat())
             bb.putFloat(d.position.z.toFloat())
@@ -212,15 +212,3 @@ fun GeneratorBuffer.group(builder: GeneratorBuffer.() -> Unit) {
     gb.builder()
     this.concat(gb)
 }
-
-fun main(args: Array<String>) {
-    val gb = generator {
-        box(20.0, 20.0, 20.0)
-        group {
-            box(40.0, 40.0, 40.0)
-            transform(transform {
-                translate(0.0, 20.0, 0.0)
-            })
-        }
-    }
-}
\ No newline at end of file
diff --git a/orx-palette/src/main/kotlin/PaletteStudio.kt b/orx-palette/src/main/kotlin/PaletteStudio.kt
index 1e1bb8aa..743fc3d0 100644
--- a/orx-palette/src/main/kotlin/PaletteStudio.kt
+++ b/orx-palette/src/main/kotlin/PaletteStudio.kt
@@ -138,7 +138,7 @@ class PaletteStudio(
         val foreground = clrs
                 .takeLast(clrs.size - 1)
                 .map { getContrast(background, it) to it }
-                .maxBy { it.first }!!
+                .maxByOrNull { it.first }!!
                 .second
 
         var constraint = clrs.size
diff --git a/orx-panel/src/main/kotlin/org/openrndr/panel/elements/EnvelopeEditor.kt b/orx-panel/src/main/kotlin/org/openrndr/panel/elements/EnvelopeEditor.kt
index 1994a701..54e3d9ce 100644
--- a/orx-panel/src/main/kotlin/org/openrndr/panel/elements/EnvelopeEditor.kt
+++ b/orx-panel/src/main/kotlin/org/openrndr/panel/elements/EnvelopeEditor.kt
@@ -37,7 +37,7 @@ class Envelope(constant:Double = 0.5) {
         events.envelopeChanged.trigger(EnvelopeChangedEvent(this))
     }
 
-    fun findNearestPoint(v: Vector2) = points.minBy { (it - v).length }
+    fun findNearestPoint(v: Vector2) = points.minByOrNull { (it - v).length }
 
     fun removePoint(v: Vector2) {
         points.remove(v)
diff --git a/orx-panel/src/main/kotlin/org/openrndr/panel/hash/WatchHash.kt b/orx-panel/src/main/kotlin/org/openrndr/panel/hash/WatchHash.kt
index d127c4dd..8310ae9c 100644
--- a/orx-panel/src/main/kotlin/org/openrndr/panel/hash/WatchHash.kt
+++ b/orx-panel/src/main/kotlin/org/openrndr/panel/hash/WatchHash.kt
@@ -1,12 +1,13 @@
 package org.openrndr.panel.hash
 
 import kotlin.reflect.KProperty0
+import kotlin.reflect.KProperty1
 import kotlin.reflect.full.declaredMemberProperties
 
 fun watchHash(toHash: Any): Int {
     var hash = 0
     for (property in toHash::class.declaredMemberProperties) {
-        val v = (property.getter)(toHash)
+        val v = ((property.getter) as KProperty1<Any, Any>).invoke(toHash)
         if (v is KProperty0<*>) {
             val pv = v.get()
             hash = 31 * hash + (pv?.hashCode() ?: 0)