cam_pos      = [0.270563, 1.07051, 0.387717]';
cam_dir      = [0.477117, 0.531872, -0.699623]';
cam_up       = [-0.602908, 0.777296, 0.179759]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.850433, -0.446936, -0.919735]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;