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maya bone animation export script

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i work on a bone animation export script with maya. after a lot of trial and error i got it working but there is still one problem. the format i export to has the z-axis up and maya has the y-axis up. my exported model animates perfectly well but it's lying on the floor. i tried to use a matrix to convert the coordinate systems but i didn't get it working. it alwas resulted in garbled animations. i am a bit lost here! i also would like to have the possibility to scale the whole model but with the scale_matrix i had the same problems.
matrix $scale_matrix[4][4] = << $scale, 0, 0, 0; 0, $scale, 0, 0; 0, 0, $scale, 0; 0, 0, 0, 1 >>;
matrix $yup_to_zup[4][4] = << -1, 0, 0, 0; 0, 0, 1, 0; 0, 1, 0, 0; 0, 0, 0, 1 >>;

for ($joint in $joint_hierarchy)
   currentTime(0); // switch to bind pose

   matrix $m1[4][4] = m4x4(getAttr($joint + ".inverseMatrix"));
   matrix $offset1[4][4] = m4x4(getAttr($joint + ".worldInverseMatrix"));
   matrix $offset2[4][4] = m4x4(getAttr($joint + ".worldMatrix"));

   currentTime($frame); // switch to current animation frame

   matrix $m2[4][4] = m4x4(getAttr($joint + ".matrix"));
   matrix $m[4][4] = $m2 * $m1;
   $m = $offset1 * $m * $offset2;

   // write final animation matrix $m to file
this is how i have to construct the animation matrix. maybe some of you have an idea how to bring in my yup_to_zup and scale_matrix here? :)

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why can't you simply exchange the y and z values for all points? any matrix you have, you would simply exchange the respective columns or rows depending on the format (row or column vectors).


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I can't entirely follow your code, perhaps your matrix multiplication is in the wrong order(reversed) your idea is right I think. if you do it this way you'd want to make sure your ytoz matrix is the LAST operation appiled.

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