Non solid objects?

[Firstinaction]

How can you make plants non solid so you can walk through them(ex: tremor's giant plants)
And patches.  (ex: hanging pipes)

And grates- how can I make bottom of grate invisible?

[CreatureofHell]

The plants are models so they won't be solid to begin with (unless you set a certain spawnflag).
I don't think patches are solid either, but I'll leave that for someone else to clarify.
Everything else is just using shaders with surfaceparm nonsolid.

Grates are done with shaders too.

[Plague Bringer]

the top side of patches are solid.

first, you could either have a shader for every texture that you want to be nonsolid. you could copy any grate shader. alternatively, you could use the nonsolid shader in /common. i think that if a brush is textured with nonsolid, everything inside of it is effected.