hi,

i havent done exactly what you have done,but ive been able to import an OBJ file and then start to paint on it if that helps?

what i do is import the object then in the layer window click on the material and it brings up a new blank image,i then load my uv map for the object and then copy it to this layer and then you can paint on the object or just paint on the image you have just copied :-) im starting to use this as my default method instead of texturing objects using the incredibly fiddly bodypaint

 

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