How to make ladders
Note: This tutorial assumes you already have the basics of a level, ie. a hollowed box and a player start inside it. =]  

For this tutorial we'll be creating a ladder for the player to climb.

Step 1: 

Make your ladder. Unless you're going to get really creative you'll probably make a basic ladder with two sides and rungs in between them. I just did something simple like that as you can see on the right.

note
ignore the platform above the ladder, i just put it there for you to walk on after climbing up the ladder.

 
 
______________________________________Step 2: 
 
 
Now, create a brush that is as long as the ladder, fits just inside both sides, and is a little wider than it. It's hard to explain, but this brush is what the player will actually climb on. So we want it to basically cover the rungs all the way up. Look at the picture for a better idea. Texture this brush with the "clip" texture. Goto it's texture properties and check the ladder and playerclip boxes. The ladder box tells the game the brush is climbable. The playerclip box makes the brush basically invisible to the player. This is necessary to check because once we give the brush the ladder property it nullifies the invisibility applied by the clip texture. Click Apply All to apply those new texture properties to every side of the brush.

That's it! Go climb some ladders!

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