GL::Vector3 center = (minp+maxp)/2.0f;
const GL::Vector3 &look = camera.get_look_direction();
camera.set_position(center-look*dist);
GL::Vector3 center = (minp+maxp)/2.0f;
const GL::Vector3 &look = camera.get_look_direction();
camera.set_position(center-look*dist);