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This is how the triangle terrain looks if it's used for cliffs.
But ti's some dangerous work:
1. It compiles a long time.
2. From some places some of the faces disappear.
In this map there are no grouped objects, and no brush based entities. I'm going to compile the map again after I turn the cliffs into func_wall.
If you think there is a better way or you have suggestions, tell me in the comment section below.