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Extracting values from a matrix

Math and Physics Programming

Started by evanofsky March 27, 2006 01:11 PM

3 comments, last by JohnBolton 18 years, 1 month ago

2,950

Author

March 27, 2006 01:11 PM

This is pretty n00bish, but I just can't do matrix math. All I'm looking for is how to get scaling, rotation, and translation values back from a matrix. I mean, putting them into a matrix is pretty easy; I just use my handy-dandy D3DXMatrixXXXX() functions. But I don't know how to get them back out. Does this make sense? Help please? [smile]

etodd.io | @etodd_

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smitty1276

560

March 27, 2006 01:19 PM

It depends on what the matrix is. Are you talking about a view transformation matrix (world->camera) ?

811

March 27, 2006 01:19 PM

See this thread. decomp_affine() will work for the general case (simpler+faster methods (as shown in the thread) will work for special cases).

Amazing Curves Racing

2,950

Author

March 27, 2006 01:28 PM

Man, I had no idea it was that common of a problem.

Thanks for the linkies, and sorry for the n00bness! [imwithstupid]

etodd.io | @etodd_

JohnBolton

1,373

March 27, 2006 01:53 PM

Perhaps this is the function you are looking for: D3DXMATRIXDecompose

John BoltonLocomotive Games (THQ)Current Project: Destroy All Humans (Wii). IN STORES NOW!

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