JavaFX - applying rotation transformation - preserving transformation state before changing rotation parameters

Question

Hi folks, let me ask you for a help with my animation experiments.
case:
- ball (sphere) is moving and rotating in one direction around RotationAxis1. Rotate transform is set on the object, rotating ball by setting rotation.setAngle(angle1)
- ball hits a wall
- rotation axes changes, now the ball rotates around RotationAxis2, new rotation for this axis starts at angle2=0
issue:
what i basically need is to preserve (save/apply) rotation transformation to the object, before changing axis and angle to new values, otherwise I am getting ugly change in the object rotation
If there would be object.rotateBy() and it would preserve it's state, I would not have such problem, as I could call
object.rotateBy(angle); object.setRotationAxis(...), object.rotateBy(newAngle);
Following piece of code works for me, it preserves current rotation state, just as it would keep creating new objects and adding transformations, this can't really be used in a real scenario:
        getTransforms().add(rotate);
    private void resetRotation() {
        rotate = new Rotate(0, 0, 0, 0, new Point3D( motion.dy, -motion.dx, 0));
        getTransforms().add(rotate); //keeps current rotation state and starts a new rotation
        //TODO: IT WORKS BUT IT WOULD CASE MEMORY AND PERFORMANCE LEAK  - FIX IS NEEDED!
what I am looking for is something like:
    private void resetRotation() {
        getTransforms().remove(rotate);
        applyTransformation(rotate);     //can not find anything like this
        rotate = new Rotate(0, 0, 0, 0, new Point3D( motion.dy, -motion.dx, 0));
        getTransforms().add(rotate); //keeps current rotation state and starts a new rotation
Any hint ?
Thanks!

Answer 1

Use a concatenation:Rotate (JavaFX 8.0)