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Hi,
This function specifies an infinite plane with equation: a*x+b*y+c*z = d
Basically, (a,b,c) represent the normal vector of the plane and, d represents the distance from the origin. (0,1,0,0) will represent a plane facing upwards at the origin. (0,1,0,2) will represent a plane facing upwards 2 meters above the origin. etc..
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