FUNCTION msf_surface_check

(* SCHEMA aic_manifold_surface; *)

FUNCTION msf_surface_check (surf : surface) : BOOLEAN;

(* This function varifies the validity of a surface in the
   context of a manifold surface model.
*)

  (* elementary_surfaces are valid surface types
   *)
  IF 'AIC_MANIFOLD_SURFACE.ELEMENTARY_SURFACE' IN TYPEOF(surf) THEN
    RETURN(TRUE);
  ELSE 

    (* a swept_surface shall have a valid sweeping curve
     *)
    IF 'AIC_MANIFOLD_SURFACE.SWEPT_SURFACE' IN TYPEOF (surf) THEN 
      RETURN (msf_curve_check(surf\swept_surface.swept_curve));  
    ELSE 
 
      (* an offset_surface shall not self-intersect and shall
         reference a valid surface
       *)
      IF (('AIC_MANIFOLD_SURFACE.OFFSET_SURFACE' IN TYPEOF (surf)) AND
        (surf\offset_surface.self_intersect = FALSE) OR 
        (surf\offset_surface.self_intersect = UNKNOWN)) THEN
        RETURN (msf_surface_check(surf\offset_surface.basis_surface));
      ELSE 
 
        (* a surface_replica shall have a valid parent surface
         *)
        IF 'AIC_MANIFOLD_SURFACE.SURFACE_REPLICA' IN TYPEOF(surf) THEN 
          RETURN(msf_surface_check(surf\surface_replica.parent_surface)); 
        ELSE

          (* a b_spline_surface shall not self-intersect
           *)
          IF (('AIC_MANIFOLD_SURFACE.B_SPLINE_SURFACE' IN TYPEOF(surf)) AND
            (surf\b_spline_surface.self_intersect = FALSE) OR
            (surf\b_spline_surface.self_intersect = UNKNOWN)) THEN
            RETURN(TRUE);
          END_IF;
        END_IF; 
      END_IF; 
    END_IF; 
  END_IF; 
  RETURN(FALSE); 
END_FUNCTION;

Referenced By

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2012-03-27T17:14:00-04:00