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This function returns the polygon plane equation (Ax+By+Cz+D=0)
The function returns the equation A,B,C,D. Note the (A,B,C) is the plane normal
in other "words" N==( plane[0], plane[1], plane[2]).
If the polygons belongs to a dynamic object, the function will return the plane in object space
(which means that you will always get the same plane no mater how much the object moves or rotates)
to get in world space also the planes of the polygons which belong to dynamic objects, call
STATE_polygon_get_plane_extended.
Example:
double plane[4];
STATE_polygon_get_plane(my_poly, plane);
see also STATE_polygon_get_plane_extended()
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