[quake3-bugzilla] [Bug 5199] IQM joint matrices wrong

[bugzilla-daemon at icculus.org]

https://bugzilla.icculus.org/show_bug.cgi?id=5199

gimhael <matthias.bentrup at googlemail.com> changed:

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--- Comment #3 from gimhael <matthias.bentrup at googlemail.com> 2011-08-25 10:58:01 EDT ---
The IQM format uses quaternions to store the rotation part of the joint
matrixes. 

For the animation it also needs the inverse joint matrixes. The reference
implementation just uses an adhoc matrix inversion algorithm while I computed
the same result by computing the matrix of the inverse quaternion (but I made
some mistakes so it worked only when scale == 1.0).

The matrix inversion is not a general matrix inversion as you find it in a math
book, but it's specialized to the matrixes produced by JointToMatrix, so I was
a bit suspicious that it works in all cases and chose the inverse quaternion
solution instead. The operational cost of both is basically the same.

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