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« on: August 07, 2012, 05:14:19 AM »
You can copy and select brushes that utilize a certain texture in tools -> replace texture. What you want to do is build a map with a reserved texture for walls you don't want projectiles to explode on. Then you select this texture using the replace texture tool, copy it, replace the texture with skybox. Reselect your old texture brushes make them func_illusionary and then drag your skybox copy back over to overlay on top of all your illusionary textures. The method could be expensive if you use a lot of these walls, I like the convenience though.
Note: It has bugged out on my a couple times and all randomly gone to skybox instead of walls in compile. You just have to go to an autosave. Not sure as to why. Right now I have it working without leaks in my map though.