Difference between Paint object and surface material

[shape3d]

I read the parts in the help file, but what is the practical difference? If I bake something to paint room, I get both. If I delete one of them, in both cases the paint room is empty. If I have several objects with corresponding UV sets, then I can activate and deactivate Paint object and surface material in the tab. For example, there are object 1 and 2 and both have UVs on layer 1 and 2. Per default all Paint objects and surface materials are activated. If I deactivate only paint object 1, it disappears in the paint room. If I deactivate surface material 1 and activate it again, then it appears even paint object 1 is still deactivated. The same happens vice versa. So in which case I have to do something with the paint object layers or the surface material layers?

 

CU

 

Ansgar

[shape3d]

When I lock on of the Paint object or surface material, I can't paint on the specific object in the 3d window but I can paint on it in the texture editor, very confusing.

[Carlosan]

My experience at export

 

Paint object = material

Surface material = UV layout