override fun simpleInitApp() {
        // do this at init 
        MaterialDefinitions.load(assetManager) 
        
        // creating a material with a more simple API
        val floorMat = UnshadedMaterial()
        floorMat.setColor(ColorRGBA(155, 164, 193))

        val floor = Geometry("FLOOR", Box(10f, 10f, 10f))
        floor.material = floorMat
    }

    override fun simpleInitApp() {
        MaterialDefinitions.load(assetManager)
        addLighting()

        val material = LightingMaterial()
        material.setColor(Orange) // same value for 'Diffuse' and 'Specular'

        val geometry = Geometry("SPHERE", Sphere(15, 15, 1f))
        geometry.material = material
        geometry.shadowMode = RenderQueue.ShadowMode.CastAndReceive

        rootNode.attachChild(geometry)
    }

    private fun addLighting() {
        val decorLight = DirectionalLight()
        decorLight.direction = Vector3f(-1f, 1f, -2f).normalizeLocal()
        decorLight.color = ColorRGBA.White
        rootNode.addLight(decorLight)
    }

    val material = LightingMaterial()
    material.setColors(ColorRGBA.Orange, ColorRGBA.White)

    override fun simpleInitApp() {
        viewPort.backgroundColor = ColorRGBA("#1c3064")
    }

    override fun simpleInitApp() {
        viewPort.backgroundColor = ColorRGBA(155, 164, 193)
    }

import be.encelade.chimp.utils.NodeHelperUtils.attachChildren
import com.jme3.scene.Geometry
import com.jme3.scene.Node

class SceneNode : Node("MY_SCENE") {

    init {
        attachChildren(makeFloor(), makeGrid())
    }

    private companion object {

        fun makeFloor(): Geometry {
            // ..
        }

        fun makeGrid(): Geometry {
            // ...
        }

    }
}

    import be.encelade.chimp.utils.VectorOperatorUtils.plus

    // ...
    val v1 = Vector3f(2f, 1f, 1f)
    val v2 = Vector3f(4f, 4f, 4f)

    // prints (6.0, 5.0, 5.0)
    println(v1 + v2)

class DemoSimpleApp : SimpleApplication() {

    private val tpfAccumulator = TpfAccumulator(.5f) { tpf ->
        val fps = (1 / tpf).toInt()
        println("[${DateTime.now()}] running at $fps FPS")
    }

    override fun simpleUpdate(tpf: Float) {
        tpfAccumulator.simpleUpdate(tpf)
    }
}