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getceilzofslope <sectnum> <x> <y> <return>

Returns the z coordinate of the ceiling at the coordinates <x> and <y>. If the sector doesn't have a ceiling slope then it immediately returns the sector's ceilingz so it's not that slow. You may want to check for slopes yourself with ceilingstat if you think the overhead of calling this function is too slow.

For the most accurate usage, use it in conjunction with updatesector (not updatesectorz). Also see getflorzofslope.

getactor[THISACTOR].x x
getactor[THISACTOR].y y
updatesector x y temp
getceilzofslope temp x y temp2