Add simple demo for orx-dnk3

orx-dnk3/build.gradle

@@ -14,6 +14,7 @@ dependencies {
     implementation(project(":orx-keyframer"))
 
     demoImplementation(project(":orx-camera"))
+    demoImplementation(project(":orx-mesh-generators"))
     demoImplementation("org.openrndr:openrndr-core:$openrndrVersion")
     demoImplementation("org.openrndr:openrndr-extensions:$openrndrVersion")
     demoImplementation("org.openrndr:openrndr-ffmpeg:$openrndrVersion")

orx-dnk3/src/demo/kotlin/DemoScene03.kt

@@ -0,0 +1,64 @@
+import org.openrndr.application
+import org.openrndr.color.ColorRGBa
+import org.openrndr.draw.DrawPrimitive
+import org.openrndr.extensions.SingleScreenshot
+import org.openrndr.extra.dnk3.*
+
+import org.openrndr.extra.dnk3.gltf.buildSceneNodes
+import org.openrndr.extra.dnk3.gltf.loadGltfFromFile
+import org.openrndr.extra.dnk3.gltf.loadGltfFromGlbFile
+import org.openrndr.extras.camera.Orbital
+import org.openrndr.extras.meshgenerators.boxMesh
+import org.openrndr.extras.meshgenerators.sphereMesh
+import org.openrndr.math.Vector3
+import org.openrndr.math.transforms.transform
+import java.io.File
+
+fun main() = application {
+    configure {
+        width = 1280
+        height = 720
+        //multisample = WindowMultisample.SampleCount(8)
+    }
+
+    program {
+        if (System.getProperty("takeScreenshot") == "true") {
+            extend(SingleScreenshot()) {
+                this.outputFile = System.getProperty("screenshotPath")
+            }
+        }
+
+        val root = SceneNode()
+        val scene = Scene(root)
+
+        val lightNode = SceneNode()
+        lightNode.transform = transform {
+            translate(0.0, 10.0, 0.0)
+        }
+        lightNode.entities.add(PointLight())
+        lightNode.entities.add(HemisphereLight(upColor = ColorRGBa.PINK, downColor = ColorRGBa(0.1,0.1,0.1)))
+        scene.root.children.add(lightNode)
+
+        val meshNode = SceneNode()
+        val box = sphereMesh(32, 32)
+        val geometry = Geometry(listOf(box), null, DrawPrimitive.TRIANGLES, 0, box.vertexCount)
+        val material = PBRMaterial()
+        val primitive = MeshPrimitive(geometry, material)
+        val mesh = Mesh(listOf(primitive))
+        meshNode.entities.add(mesh)
+        root.children.add(meshNode)
+
+        // -- create a renderer
+        val renderer = dryRenderer()
+        extend(Orbital()) {
+            far = 500.0
+            lookAt = Vector3(0.0, 0.0, 0.0)
+            eye = Vector3(3.0, 2.0, -3.0)
+            fov = 30.0
+        }
+        extend {
+            drawer.clear(ColorRGBa.PINK)
+            renderer.draw(drawer, scene)
+        }
+    }
+}