Objects move after rotation when they shouldn't

Troubleshooting General Help
1

Hi. I have a utility method called rotateRandomly(TriMesh) that does exactly what it says:

public static void rotateRandomly(TriMesh obj) {
   Quaternion quat = new Quaternion();
   float x = randomFloat(-FastMath.PI/4f, FastMath.PI/4f);
   float y = randomFloat(-FastMath.PI/4f, FastMath.PI/4f);
   float z = randomFloat(-FastMath.PI/4f, FastMath.PI/4f);
   quat.fromAngles(new float[] {x,y,z});
   obj.setLocalRotation(quat);
}


After passing a Sphere type object to this, whose coordinates have been using the full constructor, the Sphere is rotated, but also moved. I tried to even explicitly set the local and even world translation after this method was called, but to no avail. Calling Sphere.getLocalTranslation() returns the expected values that I gave it, but in the game I can see clearly that the object is not where it should be (because I have several such spheres that should be on the same plane, yet some are higher than others).

Any ideas as to what's wrong?
2

You’ve probably translated your spheres before the rotation so they are no longer rotating around the same point. Make sure you do your rotation first then do any translations.

3

Ah, right you are! Silly me, that’s what I get for using the wrong constructor! Thanks! :slight_smile:

4

Awesome … I’m glad it was something simple. You have no idea how often I used to do that :smiley: