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(c : curve_on_surface) : SET[0:2] OF surface;
LOCAL
surfs : SET[0:2] OF surface;
n : INTEGER;
END_LOCAL;
surfs := [];
IF 'STRUCTURAL_FRAME_SCHEMA.PCURVE' IN TYPEOF (c) THEN
surfs := [c\pcurve.basis_surface];
ELSE
IF 'STRUCTURAL_FRAME_SCHEMA.SURFACE_CURVE' IN TYPEOF (c) THEN
n := SIZEOF(c\surface_curve.associated_geometry);
REPEAT i := 1 TO n;
surfs := surfs +
associated_surface(c\surface_curve.associated_geometry[i]);
END_REPEAT;
END_IF;
END_IF;
IF 'STRUCTURAL_FRAME_SCHEMA.COMPOSITE_CURVE_ON_SURFACE' IN TYPEOF (c) THEN
n := SIZEOF(c\composite_curve.segments);
surfs := get_basis_surface(c\composite_curve.segments[1].parent_curve);
IF n > 1 THEN
REPEAT i := 2 TO n;
surfs := surfs * get_basis_surface(c\composite_curve.segments[i].parent_curve);
END_REPEAT;
END_IF;
END_IF;
RETURN(surfs);
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