|
You converted a Box to EP but did you select all the polys and Flip them?
I’m slightly at a loss to understand why you (or whoever wrote the tutorial) thinks that Booleans are a good way of cutting a couple of holes in what is, at this point, a Plane (one side of the box). The ordinary tools within an EP are more than sufficient. Also, Walls are solid objects, not one-sided planes, so while making a room from a box might seem simple, it is not really the right way to go about it.
I didn’t mention the Edit Normals modifier. It will not be in the available modifiers list until you select the Polys you want to flip. In this case it is also unnecessary as you can Flip selected Polys within an EP object anyway.
As to the Materials - never used the Wall Paint so I’m not sure, but it could be that it is inherently a 2-sided material where the A&D materials are not.
I would simply start again - the room itself. Start with a Box of the correct internal dimensions, add a Shell Modifier and make the box bigger on the outside. Convert back to an Editable Poly. Slect the inner and outer polys of the wall with the windows, use the Slice tool (2 horizontal, 4 vertical slices) to create the edges you need. Delete the “window” polys (inner and outer). Border select the edges surrounding the 2 window openings on the inside only. Turn on Snap to Edge/Segment, Shift+Move the selected edges until they snap into place (grab the gizmo handle, not the center of it). Vertex, select all, weld. No need for booleans at all.
Be wary of ‘net tutorials - some are good and some are not. This is all basic modeling - skills which you need to learn before you can tell, almost immediately, which category a tutorial falls into.
Max 4.2 through 2013.
XP-64 (SP2)
NVidia 9800GTX-512 (Driver 266.58).
Core 2 Quad Q6600 2.4GHz, 8Gb Ram, DX9.0c.
| 
