OpenGL: combined Translate/Rotate/Scale matrix or keep them separate?

I would recommend maintaining the transform as a Matrix (per object) because - if you keep them separately, you're introducing implicit knowledge about the order in which these operations are performed (and hence might produce different results).

If you really just need the matrix itself, there is nothing wrong with simply maintaining one matrix. This might get tricky though in case you want to do things like camera transitions.

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