cam_pos      = [0.497453, 1.499, 0.299047]';
cam_dir      = [-0.598205, 0.424402, -0.67973]';
cam_up       = [0.553104, 0.832459, 0.0329948]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.7712, 0.473778, 0.974518]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;