I believe I found your issue, it is because the normals are flipped which is what gives it that rainbow effect. If you check double sided you can see what you get in those softwares. In blender I know you can flip normals easily but I am unfamiliar with other 3d programs
the mesh uses flipped faces to make the rainbow outline effect, and it seems the program you’re using to view the model flips all the faces to face outward. i do not think it’s a roblox export problem, rather a problem with the program you’re using.
I’m using a standard 3D viewer that comes with Windows. When I import the .obj in Blender or Photoshop I got the same “rainbow result”. Can you suggest to me what program can I use to import/view .obj files without flipping the faces? I’m not going to do some changes to the 3D file itself I just need it to extract some HQ 2D files in the desired position for my projects. Actually is there a way/plugin to extract a .png file of the object directly from Roblox Studio?
I just found that when I enable the Backface Culling in Blender I finally can see everything as should be. But when I try to render it as .PNG… it’s still not black but rainbow. I try to flip the normals but with no success. Argh!