This paper presents a new multi-directional blending technique for heterogeneous object modeling. Contrary to earlier studies, this paper introduces material blending through multiple features with different material composition. Firstly, the Voronoi diagram of multiple-target curves is constructed to generate bisector of the geometric domain. Then, metamorphosis from the generator feature to target features is performed in two steps. First, optimum curve matching between target features and enclosing Voronoi cells is obtained. Then, an optimum ruling line alignment and insertion technique between the Voronoi diagram and generator features is developed. Next, multi-directional material composition is mapped based on a set of relations. The proposed methodologies are implemented and illustrative examples are given in this paper.