vertex_index       26 src/mesh/SphereMesh.cpp     unsigned int vertex_index   = 1;
vertex_index       53 src/mesh/SphereMesh.cpp             (*vertices)[vertex_index] =
vertex_index       54 src/mesh/SphereMesh.cpp             (*normals)[vertex_index] =
vertex_index       59 src/mesh/SphereMesh.cpp             ++vertex_index;
vertex_index       63 src/mesh/SphereMesh.cpp     (*vertices)[vertex_index] =
vertex_index       64 src/mesh/SphereMesh.cpp     (*normals)[vertex_index] = Vec3f(0.0f, 0.0f, -1.0f);