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01-03-2012, 03:58 PM   #1
devthep
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Join Date: Mar 2012
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Rotation Matrix from transform, rotation, and pivot
Hi all,

I have a problem where i trying to develope a rotation matrix knowing a objects transform (x,y,z), rotation (x,y,z) world pivot (x,y,z). i think key is to figure out theta from rotation (x,y,z), but don't know. This might be a basic algebra question, but i'm trying to do it in maya. Thanks for any help.

Do i do it like theta = tan-1 (-z/sqrt(x^2+y^2)) from xyz of rotation and go from there?

thanks
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01-03-2012, 04:07 PM   #2
NextDesign
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Hi devthep, you mean like an OpenGL rotation matrix?

You can get the transformation matrix of an object by running the following:

Code:
xform -q -m `ls -sl`;
This will give you a standard 4x4 matrix. If the object is at the origin, and has not been modified, it returns the 0-1 identity matrix. You can then decompose it to find the rotation matrix.

You can also do the following in python: www.akeric.com/blog/?p=1067
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Last edited by NextDesign; 01-03-2012 at 04:17 PM.
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