cam_pos      = [-0.524404, 1.44603, 0.456372]';
cam_dir      = [0.778838, -0.0192575, 0.626929]';
cam_up       = [0.508261, 0.605071, -0.61283]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.488822, -1.0586, -0.639783]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;