Rotation is affecting movement.

[michalbe]

Repro

• Notice the red sphere in the middle. It's moving + 0.06 in the x direction each frame:
  
• Now, let's rotate it in every frame:

  sphere.rotate_ud(16/1000);
  sphere.rotate_rl(16/1000);

With the same movement logic, the scene looks like this now:

[stasm]

I have a WIP branch which adds local_position and makes position be relative to the world space.