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Frustrating matrix problems

Started by evanrogers Apr 17, 2006 at 7:39 PM 4 replies 700+ views

Original Post

Apr 17, 2006 at 7:39 PM

I'm trying to do something pretty standard: rotate a 3D object around a point, using an axis defined by a unit vector, and an angle defined by a float. It works fine 90% of the time, but in certain positions, the matrix gets transformed to a bunch of huge negative values, like an overflow occured. Has anyone experienced a similar problem? - Evan

Zakwayda

Apr 17, 2006 at 7:42 PM

Can you post some code? Info about what math library or API you're using would also be helpful.

evanrogers

Apr 17, 2006 at 7:54 PM

Hmm, how do I paste source code into one of those scrollable windows with syntax coloring? (I'm new here.)

- Evan

Zakwayda

Apr 17, 2006 at 8:24 PM

[ source ][ /source ] (without the spaces) :-)

evanrogers

Apr 17, 2006 at 8:26 PM

Okay I found the error. I had accidentally put a transformation from local space to world space inside a loop that should have been outside the loop. (Something to look for if your matrices ever blow up :D )

Also, I'm still trying to figure out how to paste source code with syntax coloring. Any help?

- Evan

evanrogers

Apr 17, 2006 at 8:26 PM

Thanks!

- Evan

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