Here's the deal. I want a room in the map to be completely invisible, even from people with noclip. My first thought was to make the outside of the textures completely black so they'd blend with the void. However, since source doesn't render the first texture between void and inside the map when you're in the void, that didn't work as you'd see X-ray right into the room. My next thought was to construct a pure black box around the room so that Source would not render that, yet still render the room inside. However, that doesn't work because you can see fog inside the box. Does anyone know how I can go about making a room completely invisible? Thanks.