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kirkd

Matrix API?

8 posts in this topic

Does anyone know of a good (read "free and reliable") API for matrix calculations. I''m looking for something that can do inversions along with all the other good matrix operations. Thanks!! -Kirk
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i still think this is an excellent set of basic 3d graphics structures:

http://www.gamedev.net/reference/articles/article988.asp

a2k
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Thanks for the link! I notice, however, they don''t supply any code for inversion. ugh. I guess I''ll have to do that one myself.

-Kirk
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I''ve used a math library called Newmat, which is decent and source code is available, including inversions. Here is the link:

http://webnz.com/robert/cpp_lib.htm

Graham Rhodes
Senior Scientist
Applied Research Associates, Inc.
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Graham,

Thanks! I''m sure I can''t write an efficient matrix inversion routine better than what is available out there. This should help a lot.

-Kirk
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Sure, I''d welcome any input you have. The math isn''t the problem, however, it''s making it fast and efficient. Matrix inversion is rather costly, isn''t it?

-Kirk

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One question to ask yourself is: do I *really* need to invert the matrix? Yes, inversion is expensive and there actually are often ways to do things without needing the inverse. The method implemented in the Newmat library I think is one of the most efficient methods for *arbitrary* matrices. If you need to invert a 4x4 or 3x3 transformation matrix, then the fastest method will be a closed form solution, available I think in an appendix of the OpenGL red book as well as many other sources.

Graham Rhodes
Senior Scientist
Applied Research Associates, Inc.
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