How can I create a brush that blocks the player and objects but allows me to shoot a portal through it, like the fences in Test 16?
If you are using a grate texture then this will be automatic. If you are using a different texture or the grate texture you are trying to use is not automatic, then you will need two brushes – one which will be your actuall wall that is a func_brush set to Non-Solid, and another world brush textured completely with the tools/toolsclip texture, which will block the player and all objects but not projectiles.
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