Multiple Objects Single UV

[2ndForm]

When importing objects to use per pixel paint room, I have no idea of how to get them to use the same UV. There is a Unify UV button, which works sometimes.
As in literally, it worked once, and never again. I cannot recreate it no matter how I fuss with the UV settings.
Anyone have this/know what Im taling about/point me at any kind of tutorial or documentation that isnt super specific use cases on just how to get in multi objects/set up UVs/Mats?

[Mortal Wombat]

Are you talking about separate objects that are all mapped to a single UV 0-1 space? If so you could try using the retopo room to consolidate the UV shells into a single "retopo object".
HOW:
Import your mesh into the paint room, goto the retopo room, select Retopo>Import, select the same mesh then hit enter to bring the mesh in. Select no to snapping as it is the same mesh. You should see all your separate shells in the Retopo Group window as "retopo objects" as well as an object called Retopogroup1. At the bottom of the Retopo Group window is a button to select all faces on this layer and another button to move selected faces to current layer. Use these buttons to copy the faces from each of the objects onto a single layer then delete the empty layers. Once this is done goto File>Export retopo object, save it and reimport to the paint room.
As a side note if you apply the same material to each object in your modelling program 3d coat usually sees them as a single UV but not always couldn't tell you why.
Hope this helps

[2ndForm]

Originally posted by Mortal Wombat:

Are you talking about separate objects that are all mapped to a single UV 0-1 space? If so you could try using the retopo room to consolidate the UV shells into a single "retopo object".
HOW:
Import your mesh into the paint room, goto the retopo room, select Retopo>Import, select the same mesh then hit enter to bring the mesh in. Select no to snapping as it is the same mesh. You should see all your separate shells in the Retopo Group window as "retopo objects" as well as an object called Retopogroup1. At the bottom of the Retopo Group window is a button to select all faces on this layer and another button to move selected faces to current layer. Use these buttons to copy the faces from each of the objects onto a single layer then delete the empty layers. Once this is done goto File>Export retopo object, save it and reimport to the paint room.
As a side note if you apply the same material to each object in your modelling program 3d coat usually sees them as a single UV but not always couldn't tell you why.
Hope this helps

Hey thanks a lot for the feedback, I believe I kept getting stuck on the bug with it not displaying even when you are using a single material/merged their UVs. In the end it worked if I imported the first mesh, then the second, went into UV edit, unified them, deleted unused UVs, applied it AND THEN import textures to use.
Originally I was trying to do what made sense to me, import the base object, apply its texture, import the second object. It seems it only works if you do the steps I mention above.

I will try out what you are saying though, as I didnt even think to use the retopo tools (Im just doing a paint/the UVs were made in Blender). Thanks a tonne for your reply, I was at my wits end and even though I 'fixed' it, I am still unsure as to why.