is it possible to have invincible walls such as that you can see the wall but you can walk right through it
The way I done it was to make a brush out of wall ilusion which is in yavin then just texture the face of it any way you want that way you can see the wall but also walk straight through
Cover the entire brush in system/nodraw then texture one side with the texture you want to be able to see, that'll be non solid.