vector2            39 include/mesh/CylinderMesh.hpp     angle(Vec3f& vector1, Vec3f& vector2);
vector2           116 src/mesh/CylinderMesh.cpp CylinderMesh::angle(Vec3f& vector1, Vec3f& vector2)
vector2           118 src/mesh/CylinderMesh.cpp     float dot = vector1 * vector2;
vector2           119 src/mesh/CylinderMesh.cpp     float det = vector1.x() * vector2.y() - vector1.y() * vector2.x();