But does havok use only the decomposing scaling, or all of them, or the world matrix to build the physics body?
If using all of them, or the world matrix itself, the final transformed result should not make a difference whether the scaling is negative or not.
It uses decomposed values. refer to my example to understand to issue it imposes with negative scales in the hierarchy. the solution is to fix your hierarchy of transforms.
Running the scene in right handed mode could also help cc @Cedric to confirm ?
Not completely. It will remove the scaling/rotation for the _root transform. Not for the transforms deeper in the hierarchy.
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