Fig. 7From: Review of heterogeneous material objects modeling in additive manufacturinga A comprehensive framework for modeling heterogeneous objects [56]. b Volumetric attribute data represented by trivariate B-spline functions [64]. c Trivariate Simplex Splines for inhomogeneous solid modeling [65, 66]. d Complex heterogeneous object modeled using trivariate B-spline primitives [67]Back to article page