const GL::Mesh *m = object->get_mesh();
const GL::VertexArray &vertices = m->get_vertices();
int vertex_offs = vertices.get_format().offset(GL::VERTEX2);
const GL::Mesh *m = object->get_mesh();
const GL::VertexArray &vertices = m->get_vertices();
int vertex_offs = vertices.get_format().offset(GL::VERTEX2);