Making a texture invis inGame

JimWest

I saw that the checkerboard texture is getting used to "block" a player, but it isn't visible in the game.
When I place it in my map, it's visible.
How can I make that texture invis in the map?

Kouji_San

You need to add those faces to the <a href="http://www.unknownworlds.com/ns2/wiki/index.php/Ns2_sample#CollisionGeometry" target="_blank">CollisionGeometry</a>* group, also it's not mandatory to use the checker board texture

*The name of this group is case sensitive and it needs to be a group not a layer