FUNCTION above_plane
(* SCHEMA STRUCTURAL_FRAME_SCHEMA; *)
(* Function Declarations *)
(* New for LPM/6 *)
FUNCTION above_plane
(p1, p2, p3, p4 : cartesian_point) : REAL;
LOCAL
dir2, dir3, dir4 : direction :=
dummy_gri || direction([1.0, 0.0, 0.0]);
val, mag : REAL;
END_LOCAL;
IF (p1.dim <> 3) THEN
RETURN(?);
END_IF;
REPEAT i := 1 TO 3;
dir2.direction_ratios[i] := p2.coordinates[i] - p1.coordinates[i];
dir3.direction_ratios[i] := p3.coordinates[i] - p1.coordinates[i];
dir4.direction_ratios[i] := p4.coordinates[i] - p1.coordinates[i];
mag := dir4.direction_ratios[i]*dir4.direction_ratios[i];
END_REPEAT;
mag := sqrt(mag);
val := mag*dot_product(dir4, cross_product(dir2, dir3).orientation);
RETURN(val);
END_FUNCTION; (* STEP Part 42 (New for 2nd edition) *)
Referenced By
Defintion above_plane is references by the following definitions:
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2023-03-25T00:11:39-04:00