Hi! Can quake 3 textures be included in the game?
In short No. Quake 3 textures are not under the GPL and so
cannot be released with this game.
However many of the quake 3 textures have been re-created & licensed under the GPL for OpenArena. From my understanding not all quake 3 textures have been re-created. So some are missing.
So thats why some custom maps for quake 3 don't appear properly in OpenArena.