The Constructive Hypervolume Model was proposed by Alexander Pasko for modeling heterogeneous objects using function representation approach. This model includes the volumetric material distribution as non-uniform gradually varying materials with density gradient and Multi-scale microstructures. Example of multi-material object is shown on Figure 1.

FRepCAM allows to slice FRep multi-material models and get a set of layers for 3D printing directly (Figure 2).