Have not done perf testing on this much yet, but if you want to save some memory and bandwidth at the cost of a bit of maths try packing your normal+tangent basis into a quaternion instead. It might be a good option vs 8-bit normals. Can even compress the quat into 3 components too if you assume dot(q,q)=1 by negating the quaternion if w is negative which should work fine if its normalized. I suspect this could be a win for static geometry.
Showing posts with label normal. Show all posts
Showing posts with label normal. Show all posts
Sunday, October 18, 2009
Tangent Basis as a Quaternion
Have not done perf testing on this much yet, but if you want to save some memory and bandwidth at the cost of a bit of maths try packing your normal+tangent basis into a quaternion instead. It might be a good option vs 8-bit normals. Can even compress the quat into 3 components too if you assume dot(q,q)=1 by negating the quaternion if w is negative which should work fine if its normalized. I suspect this could be a win for static geometry.
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