cam_pos      = [-1.09602, 1.57217, 1.06266]';
cam_dir      = [0.860809, 0.117783, 0.495111]';
cam_up       = [0.0639606, 0.9401, -0.334846]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.671508, -0.425475, -1.06628]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;