Merging 3D Layers Changes Mesh..??

Question

Ok something weird is going on here...
I've imported a simple .obj file with a few beveled faces into my PS doc and then created a simple 3d postcard layer. When I merged the two 3D layers, (.obj file layer is top layer) PS seems to have removed some of the faces in my places .obj file.. ?? What possibly could be happening?
Any and all help is greatly appreciated, thanks!
(Win7 PS CS5 Extended)

Answer 1

Let me go ahead and try to briefly explain what I'm trying to do:
- I'm building a digitial kitchen room setting, combining 2D and 3D elements.
- I'm first using the Vanishing Point filter to actually build my walls, ceiling and floor by creating a plane from one of the 2D pieces of furniture, then Ctrl-dragging out the rest of the planes to match that piece's perspective, thus creating the room
- my .obj file is actually a waynescoating type baseboard I modeled in Maya, then imported into PS
- Obviously, I want the baseboard to match the perspective of the room, so I create a 3D layer from Vanishing Point from one of the planes (a wall), then merge that layer with the baseboard layer (I've discovered the baseboard layer must be the top layer), because that allows the baseboard to take on the same perspective of the plane. (Hope I'm not confusing you at this point. lol)
- So, after seemingly succeeding finally with getting the perspective of the baseboard to match my room, my beveling in the baseboard totally disappers after merging with the 3D plane.
and, as I imagined, that wasn't so brief explaining that, sorry.