Comments (7)
Hi @jinfagang,
All existing SMPL-Based methods directly regress 6D rotation matrix from the model (e.g., SPIN, PARE). You can find the function to transform 6d into 9d (3*3) matrix (rot6d_to_rotmat).
You can refer to this paper ( On the continuity of rotation representations in neural networks) to understand why existing SMPL-Based models use it. Thanks!
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My question is why your input shape is 24x3 and 24x6, in rotation matrix, shouldn't it be 24x3x3 and 24x3x4 (rot6d is R and T)?
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Sure, but 6D representation is enough. You can transform them into each other. Try it.
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My output is rotmat 3x3, I reshape it like (-1, 3) seems not logically right, if I reshape to (-1, 9), it can not feed into model. I want avoid conversion to rot6d, if keep original output would save processing time. and I just need output from SmoothNet be rotmat 3x3.
BTW, does there a ready to use function to convert a [1789, 24, 3, 3] to SmoothNet input need windowed input function? Hardlly to tell how to convert my data from datasets.py massive codes. I think it need something like [B, 32, 3]
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Please try to reshape the input of SmoothNet as [N, C, T]. C is 24*3*3. T is a window size.
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@ailingzengzzz Does NxT=Seqlen?
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Yes, if there is no overlap among the sliding windows.
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