I wrote my half-edge datastructure based on this webpage.
The mesh is loaded from a .obj, contained info for each vertex and what 3 vertices compose a face. The only problem is: how do I know what's the pair edge for a specific edge?
Right now I record not only end vertex but also start vertex info in edge struct, compare O(N^2) to find out pair edge. I think there is a better way but don't know how.
