How to make a texture whom can walk through ?

i want make walkable texture whit blue parts i don't know how to tell. It's the same like wire and aliens stuff.

func_illusionary

skin:
- Empty: you can just walk right through it
- Volumetric Light: more like walking through water if I remember correctly

Just make sure that render mode is set to solid and the blue sections of the texture won't be rendered.

In the texture (and you'll probably need to check with this on VERC) I think the special color is 0 0 255.