Thanks, I'm also wondering about the scaling of textures. I have some rooms in my level where textures are scaled 2X for the ceiling and floor. ON my desktop they run just fine, but on my Laptop (P42.6Ghz, ATI Mobility 9000) blocks of the texture will black out as I move. All level textures are 512X512, and this problem occurs in rooms where 1 or two fo the textures have been scaled up.