gameobject.kt

class GameObject(
    model: Model,
    private val shape: btCollisionShape,
    mass: Float
) : ModelInstance(
    model
), Disposable {

    // For ray picking
    val center = Vector3()
    val dimensions = Vector3()
    var radius = 0f
    private val bounds: BoundingBox = BoundingBox()

    // end for ray picking
    // for animation
    var controller: AnimationController
    // end for animation

    private val localInertia = Vector3()
    private val constructionInfo =
        btRigidBody.btRigidBodyConstructionInfo(
            mass,
            null,
            shape,
            localInertia
        )

    val body: btRigidBody =
        btRigidBody(constructionInfo)
    val motion: MyMotionState =
        MyMotionState()

    init {
        // for ray picking
        calculateBoundingBox(bounds)
        bounds.getCenter(center)
        bounds.getDimensions(dimensions)
        radius = dimensions.len() / 2f
        // end ray picking

        motion.transform = transform

        if (mass > 0f)
            shape.calculateLocalInertia(mass, localInertia)
        else
            localInertia.set(0f, 0f, 0f)

        body.collisionShape = shape
        body.motionState = motion
        controller = AnimationController(this)
    }

    override fun dispose() {
        body.dispose()
        shape.dispose()
        motion.dispose()
        constructionInfo.dispose()
    }

}

fun GameObject.transform(position: Vector3) {
//    transform.setFromEulerAngles(MathUtils.random(360f), MathUtils.random(360f), MathUtils.random(360f))

    transform.setTranslation(position)
    body.proceedToTransform(transform)
}