Okay, I have a downloaded model here. I’ve decided to let the model wear a suit (like almost full body one). So, I decided to edit the model’s clothes. However, the original model was wearing long baggy trousers. I removed it and remodeled the leg (the original mesh has no thigh, only have hips, shin and feet. It was covered by the trousers).
I tried joining the hips with the shin by making a new mesh in between. I made the leg as close to the other models that work perfectly and made sure they have the same structure and the edges in the right place. Since the most parts of the leg is a new mesh, I assigned it manually as vertex groups to the bones, using other model’s vertex groups as reference (because somehow automatic weights don’t work).
Is this because I assigned the vertex groups wrongly? I couldn’t find any errors in the vertex groups so far. Or is ti something else? If you need more info, please tell me and I’ll show you if possible.