info_hullshape example

A basic example on how to use info_hullshape.

The slope on the left behaves as normal. You can stand at the very top without sliding off of it.
However, the slope on the right uses info_hullshape to give the player a different hull shape when interacting with the slope, and as such the player cannot stand at the top and will instead reliably slide off.

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The way this works is that I've made two brushes: Both of which are cuboids but with a tapered bottom, and they have the dimensions 32x32x72 and 32x32x36 for standing and crouching respectively. These are tied to each their own info_hullshape along with an origin brush each and given the targetnames slippery_stand and slippery_crouch.

Both slopes (along with the little "stairs" in front) are tied to each their own func_detail (this also works with any solid brush entity as well). With SmartEdit off, the keys zhlt_hull1 and zhlt_hull3 are added and given the values slippery_stand and slippery_crouch respectively.
This tells the compiler to generate the clipping hulls for these func_details as if the player was shaped like the two info_hullshapes.

It's also possible to use the Set as default shape (defaulthulls) key for the info_hullshapes if you wish for those to be the default of your map.