Hello! I am new to texturing and trying to make a 3d character model, one with a tail and has no butt section, and one without the tail and has the butt section. It is the exact same model but the butt section duplicated and extruded a tail part from that. I want them to share the same UVmap which I can make and do, but…
Here is a picture showing what it is, there are 2 objects that share the same outline if you look closely https://gyazo.com/90fbd05ccaa60ac8e5c91a336e709bbc
You apportion space on the texture sheet for the tail. Use one material for both objects. Or, when you have the tail attached, hide the seam with some loose alpha cards to blend them better. Or use a texture painter that can paint across seams like Substance Painter.