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Editorial Team
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Asked: 2026-06-02T00:35:28+00:00

I have two 4×4 OPENGL Matrices – 1st matrix holds rotation and position of

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I have two 4×4 OPENGL Matrices –

  • 1st matrix holds rotation and position of an object at frame 0.

  • 2nd matrix holds rotation and position of an object at frame X;

I want to retrieve a movement offset of an object between frame 0 and X,
is this enough ( possible ) if I just subtract both?

CMatrix4x4 offsetMatrix = matrixAtFrameX - matrixAtFrame0;

What I am doing is exporting per frame Bone transformation matrix where this matrix is an offset of the transformation between frame 0 of the animation and frame X.

  • Can I subtract both matrices ?

  • What are the results ?

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1 Answer

  1. Editorial Team

    You’ll need to multiply the matrix at frame x with the inverse of the matrix at frame 0.

    matrixOffset = inverse(matrixAtFrame0) * matrixAtFrameX

    This will give you the relative transformation and rotation between the frames.

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