cam_pos      = [0.417142, 1.50684, 0.237178]';
cam_dir      = [-0.950579, -0.310126, 0.0148929]';
cam_up       = [-0.29824, 0.898707, -0.321527]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.114818, 0.412404, 1.25922]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;