function "join_meshes_as_scene" produces wrong UV coordinates

[WhoTHU]

It seems that the function join_meshes_as_scene produces weird results.
I joined several single meshes as a whole mesh by running:

mesh = p3d.structures.join_meshes_as_scene(meshes)

where "meshes" is a list of meshes with textures. However, when I render "mesh", it comes to this

But it is supposed to be

which I got by joining these meshes manually

I checked the map of the new mesh:

It seems that the black area on the body results from the black area on the texture map. The function may mistake the transformed UV coordinates.

[bottler]

This is really weird, and should be working if the original meshes are working. Can you perhaps paste the output of rendering the original meshes, and use the texturesuv_image_PIL function on each of the input meshes and also the output meshes and paste the pictures? That should make it easy to see what is going on.

[WhoTHU]

This is really weird, and should be working if the original meshes are working. Can you perhaps paste the output of rendering the original meshes, and use the texturesuv_image_PIL function on each of the input meshes and also the output meshes and paste the pictures? That should make it easy to see what is going on.

Sure I put the texturesuv_images here. To simplify I joined 2 meshes, where the original texturesuv_images are


The joined texturesuv_image is

[bottler]

Thanks. That makes it really clear. I agree there's a bug and I can replicate it.

import torch
from pytorch3d.vis.texture_vis import texturesuv_image_matplotlib
from pytorch3d.renderer import TexturesUV
a=TexturesUV(maps=torch.full((1,4000,4000,3),0.8),
             faces_uvs=torch.arange(300).reshape(1,100,3),
             verts_uvs=torch.rand(1,300,2)*0.4+0.1)
b=TexturesUV(maps=torch.full((1,2000,2000,3),0.7), 
             faces_uvs=torch.arange(150).reshape(1,50,3),
             verts_uvs=torch.rand(1,150,2)*0.2+0.3)

[gkioxari]

@bottler has fixed the issue! @WhoTHU feel free to reopen if you have further questions!