How do you...

[Megalomaniac]

Make normal looking hills that are smooth? :rolling:

 

[AgentPothead]

Check this out man.
http://www.valve-erc.com/srcsdk/Levels/displacements.html

 

[Megalomaniac]

One more thing, How do you make working 3D sky-boxes? Don't send me to the Verc one, it confused me

 

[AgentPothead]

Did you check out the example map? I'm pretty sure there is a 3dskybox example. I find it's easiest to look at an example and figure out how each piece is working together.

 

[Megalomaniac]

To bad they don't have one for ladders

 

[Cunbelin]

Though I've not tried it myself there is this tutorial:

http://www.interlopers.net/content.php?article.110