Math-Get perpendicular to slope

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Returns the perpendicular to the slope between two vectors. You need to load the routine M_CheckAng360 before this. By Orso B. Schmid

{ Orso ***************************** }
{ returns the slope between two points, useful for a line }
{ this was called "M_GetAngleBetwPoints" before }
FUNCTION M_GetPerpToSlope(v1, v2: VECTOR): REAL;
		M_GetPerpToSlope := M_CheckAng360(M_GetSlope(v1, v2) + 90);