About SMPL GT Visualizing

[haolyuan]

I find the mesh from the original SMPL GT not standing on a plane such as an XOY/XOZ plane but on a little Inclined plane. Using aitviewer to visualize could make SMPL mesh stand on a fixed floor. How could I get this transformation to transform the original SMPL GT mesh standing on a fixed floor?
It seems that the floor in aitviewer is predefined and makes some transformations. It would be helpful if the transformation about the preset floor could be provided.
Thanks a lot!