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Update description of SMPL

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Qing Shuai 2021-03-23 14:43:28 +08:00 committed by GitHub
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doc/02_output.md
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@ -44,10 +44,17 @@ The data in `smpl/000000.json` is also a list, each element represents the SMPL
"shapes": <(1, 10)>
}
```
We set the first 3 dimensions of `poses` to zero, and add a new parameter `Rh` to represents the global oritentation, the vertices of SMPL model V = RX(theta, beta) + T.
If you use SMPL+H model, the poses contains `22x3+6+6`. We use `6` pca coefficients for each hand. `3(jaw, left eye, right eye)x3` poses of head are added for SMPL-X model.
### Attention (for SMPL/SMPL-X users)
**This parameter is a little different from original SMPL/SMPL-X parameters.**
We set the first 3 dimensions of `poses` to zero, and add a new parameter `Rh` to represents the global oritentation, the vertices of SMPL model V = RX(theta, beta) + T.
Please note that the paramter `Rh` is not equal to `global_orient` in SMPL-X model. We take this representation because that changing paramters to new coordinate system in origin is difficult(see [this link](https://www.dropbox.com/scl/fi/zkatuv5shs8d4tlwr8ecc/Change-parameters-to-new-coordinate-system.paper?dl=0&rlkey=lotq1sh6wzkmyttisc05h0in0)).
In our representation, you can just use `R'@(RX + T) + T'` to convert the model, and the new global rotaion and translation is simply written as `R'@R` and `R'@T + T'`
To compute the joints locations from these parameters, please refer to `./code/vis_render.py`. The key steps are:
```python
# 0. load SMPL model
@ -111,4 +118,4 @@ We have not implement the export of SMPL+H, SMPL-X model yet. If you are interes
```bash
BLENDER_PATH=<path_to_blender>/blender-2.79a-linux-glibc219-x86_64
${BLENDER_PATH}/blender -b -t 12 -P scripts/postprocess/convert2bvh.py -- <path_to_output_smpl> --o <path_to_bvh>
```
```