How to get the Transformation Matrix?

[R132]

Thanks for sharing your excellent work.
How to get the Transformation Matrix from smplest-X result to WHAC coordinate system?

[wqyin]

Thank you for the question.
SMPLest-X operates in the local camera coordinate system, whereas WHAC uses a world coordinate system originating from the first frame of the camera coordinate system.
Therefore, the transformation matrix here is aligned with the scaled camera trajectory and the camera rotations across frames.
I hope this clarifies your question.