I have been trying to resolve the access violation in the program for bounding volume hierarchy. Which takes an 3-D object "statue.ply" and creates a bounding volume hierarchy through which a ray tracer is used. I get an access violation error while running it. I have used SDL and lib3d packages. I'm using visual studio 2010 on windows 7 >Error: Unhandled exception at 0x00fa2e80 in bvh.exe: 0xC0000005: Access violation reading location 0x00000004. Call Stack :> `bvh.exe!Triangle::Triangle(const Vertex * vertexA, const Vertex * vertexB, const Vertex * vertexC, unsigned int r, unsigned int g, unsigned int b, bool twosided, bool triNormalProvided, Float3 triNormal)` Line 393 + 0x150 bytes C++ can anyone help with it. Thank you