cam_pos      = [0.384992, 0.609995, -0.201587]';
cam_dir      = [0.853255, 0.362096, 0.375289]';
cam_up       = [-0.509424, 0.424812, 0.748346]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.148356, 1.10352, -0.727421]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;