Hmm, I seem to be mixing up using 4d linear operations (ie, a 4x4 matrix) to represent translation, rotation, scaling, etc, with their combinations, with repres

Hmm, I seem to be mixing up using 4d linear operations (ie, a 4x4 matrix) to represent translation, rotation, scaling, etc, with their combinations, with representing a rotation itself. Thanks for your help—I'll dig more into this.