I have a problem with rigging the imported model. Here is a screenshot of my object, you can see the arm deformation. In the second picture, you can see that the mesh is tilted. Could somebody please tell me the cause of this problem? It is embarrassing but I am totally newbie in 3D modeling so I have no idea what to do.
The model is ripped with losses. There is no material data, and it's probably missing a small part and a vertex color data. This kind of game model demands deep 3D knowledge.
I made a rigging with Mixamo and tried to set up materials. I have not figured out how exactly those alpha maps are used, but overall it is correct. The weights still need attention.
A small tip I have learned: by default, Blender ignores color data for pixels with zero alpha, and you need to set Alpha from Straight to Channel Packed so it will not affect RGB value.