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pointcontents
From Quake Wiki
Syntax:
float pointcontents(vector pos)
Checks the given point to see what is there. Just because a point is empty does not mean that the player can stand there due to the size of the player - use tracebox for such tests.
Parameters:
pos- The position to test.
Returns:
- Returns one of the CONTENT_* constants. See QuakeC Globals for examples.