References wblut.geom.WB_Subdivision.WB_SubdivisionResult.addTriangle(), wblut.geom.WB_GeometryFactory3D.createCentroid(), wblut.geom.WB_Point.interpolate(), wblut.geom.WB_Quad.p1, wblut.geom.WB_Quad.p2, wblut.geom.WB_Quad.p3, and wblut.geom.WB_Quad.p4.