FUNCTION first_proj_axis

(* SCHEMA step_merged_ap_schema; *)

-- DIFF IN AP224
-- DIFF IN AP232
FUNCTION first_proj_axis
      (z_axis : direction;
       arg : direction ) : direction;
   LOCAL
      x_axis : direction;
      v : direction;
      z : direction;
      x_vec : vector;
   END_LOCAL;
      IF NOT EXISTS(z_axis) THEN
         RETURN (?);
      ELSE
         z := normalise(z_axis);
         IF NOT EXISTS(arg) THEN
            IF (z.direction_ratios <> [ 1.0, 0.0, 0.0 ]) AND (z.direction_ratios <> [ -1.0, 0.0, 0.0 ]) THEN
               v := dummy_gri || direction([ 1.0, 0.0, 0.0 ]);
            ELSE
               v := dummy_gri || direction([ 0.0, 1.0, 0.0 ]);
            END_IF;
         ELSE
            IF arg.dim <> 3 THEN
               RETURN (?);
            END_IF;
            IF cross_product(arg, z).magnitude = 0.0 THEN
               RETURN (?);
            ELSE
               v := normalise(arg);
            END_IF;
         END_IF;
         x_vec := scalar_times_vector(dot_product(v, z), z);
         x_axis := vector_difference(v, x_vec).orientation;
         x_axis := normalise(x_axis);
      END_IF;
      RETURN (x_axis);
END_FUNCTION;

Referenced By

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2020-07-28T17:02:20-04:00