I am working on the generation of Hexhedral mesh generation using octree based discretization. what I want I have volume mesh (Hexhedrals), Now using isomorphism I need project the outter most surface vertices of inner mesh onto original mesh. Could any one help me about how to extarct the durface of inner mesh?
I think the term you are looking for "Surface nets".
In Surface nets, instead of doing an exact projection onto the mesh surface, an filtering-based approximation is used. For example, in this paper, they use an iterative smoothing process, that keeps all vertices in their original volume boundary.