Exporting .PKL SMPL Meshes and defining whether to use male or female models

[nshreyasvi]

Hello, Thank you for the amazing work. I would like to know how can I export the output .npy meshes into .obj, .npz or .pkl format? I would also like to know if the output .pkl file would follow the standard SMPL keys or would the keys be changed? Moreover, is there a way to use Male/Female model and if it can be defined anywhere?

[fabienbaradel]

Hi @nshreyasvi
Thanks for your interest in our work.

You can save into a .obj file using this code snippet for the first human in the list:

vertices = humans[0]['v3d'].cpu().numpy()
faces = model.smpl_layer['neutral_10'].bm_x.faces
mesh = trimesh.Trimesh(vertices=vertices, faces=faces)
filename = "human_0.obj"
mesh.export(filename)

The mesh follow sthe SMPL-X topology (not SMPL). And we use the neutral model so we cannot choose between male or female at inference time.

[nshreyasvi]

Hello, Thank you so much. I also wanted to know if the generated meshes are fitted according to the body shape of the person and if it is able to generate meshes accurately using the neural mesh for male and female bodies without using the male and female SMPL-X templates/prompt?

[fabienbaradel]

Hi, the mesh that we are outpouting is gender neutral. So I do not have a precise answer for your question sorry.

[nshreyasvi]

Hello,
Thank you so much for the response. I was able to generate the .obj files. However, I currently face the following 2 issues:

• The output .obj files that are generated have the mesh upside down. Is that normal?
• I wanted to export the output as SMPL-X pkl files so that I can use the converter provided here to convert them into SMPL files. However, when I checked the output .npy files, I can't see the keys that are needed (betas, body_pose, transl). Do you happen to know how can the output SMPL-X mesh can be saved in the standard format so that it is possible to change it?