How can I make a surface fully slippery?

[KurinokuTheNoSmurf]

the title is self-explanatory, i'd like to make roofs where you can't stand on, or that you are instantly pushed back, kind of like in surf maps, also how do the surface is surf maps work?

 

[nesman]

on surf maps im pretty sure that the ramps are angled enough so you cant stand on it. As for the slippery thing you could use a pushing trigger and have it push them off the roof. Im not sure.

 

[Beef Bucket]

(Feel free to correct me if you already know this) Most roofs and inaccessible areas in the game are blocked off with invisible clip brushes

 

[Three Million]

You are going to want to use a clip brush and let gravity do the rest

 

[MaccyF]

to elaborate a little, if you don't want people to get up there at all, use brushes textured with playerclip.

If you want people to be able to get on top of the roof, but not be able to stay there, use a trigger_push of a low force to push players off when they stand there

there's also a slime surfaceprop for materials to make them slippy iirc, but i don't know the specifics

 

[Sheltr]

My guess is he is trying to emulate something such as "OverWatch's" roof tops where you slide off the top of the surface? but the way source engine works at this point valve would probably have to do some changes to TF2's variant of source engine itself to implement those changes.

 

[Crowbar]

I don't see a way to automate such stuff by the engine means without complicating it more than the existing solution, a trigger_push isn't it?

 

[Yrr]

ive done overwatch style slippery rooves before, i used a trigger_push directed away from the roof at a lowish force, with 48 units between the tops (so players didnt stick at the top receiving push forces in both directions

 

[Crowbar]

Aren't trigger_pushes supposed to either push player to left/right, down, or both? I'm not sure why are they up-sideways there, it will give a good result will it? Or is it not the axis of pushing?

 

[Yrr]

you can set the push direction

but yea pushing perpendicular means theres never any friction

 

[Crowbar]

Wouldn't that result in some bumping? And wouldn't pushing straight sideways be smoothier with still no friction?

 

[Yrr]

in my experience, no, perpendicular results in the smoothest movement, gravity beats push force if you do it sideways so you just hit the roof anyway

 

[14bit]

I used something similar in Underpass to prevent the trains from getting stuck. Any place where you could stand on the trains to stop them I put a small trigger_push that would push players upwards just enough to remove the friction, but low enough that you couldn't notice it when passing through. I'd assume this could work for any moving platform that has this issue.