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vchoutas / smplx

SMPL-X
https://smpl-x.is.tue.mpg.de/
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convert poses in the SMPL family #63

Closed HenriMir closed 3 years ago

HenriMir commented 3 years ago

Hello and thanks for the SMPL repos!

I'm trying to convert poses between the different SMPL body models. I have tried the conversion implemented which works very well but convert mesh into mesh with optimisation which is a quite long process.

Do you know how can we simply convert, for exemple, a SMPL-H with 156 dimensions into SMPL with 72 dimensions.

Thanks for any help!

MichaelJBlack commented 3 years ago

SMPL-H and SMPL have the same pose and shape params (unlike SMPL-X and SMPL). So you can simply ignore the hand pose params and use the other pose and shape parameters in SMPL. It is that simple.

HenriMir commented 3 years ago

thanks a lot for the clarification, I'll close the issue then.

AlyanQ commented 2 years ago

Is there a way to convert shape/pose params between SMPL and SMPLX without converting between the two using your transfer models project? Thanks

ZhengdiYu commented 2 years ago

converting between the two using your transfer

@AlyanQ Hi, did you find a solution ? I now have a set of mano pose and shape, and SMPL mano and shape, but it seems not correct to directly put them into SMPL-X model.

ZhengdiYu commented 2 years ago

SMPL-H and SMPL have the same pose and shape params (unlike SMPL-X and SMPL). So you can simply ignore the hand pose params and use the other pose and shape parameters in SMPL. It is that simple.

in https://github.com/vchoutas/smplx/tree/master/transfer_model#smpl-to-smpl%2Bh

it says: The repository contains code for converting model parameters of one model to another. Never copy parameters between the models. You will not get the same poses. SMPL, SMPL+H and SMPL-X shape spaces are NOT compatible, since each model is the result of a different training process. A more detailed explanation on how we extract correspondences between the models and the loss function used to estimate the parameters can be found [here](https://github.com/vchoutas/smplx/blob/master/transfer_model/docs/transfer.md).

Which one should I follow? can I used smpl parameters (21, 3) for SMPL-H without hand and face? Just simply replace the SMPL-H's body pose?

vchoutas commented 2 years ago

@ZhengdiYu yes you can. There should not be a comma between SMPL and SMPL+H in the above text, but a slash. I will update the README.