cam_pos      = [0.185907, 1.02167, 0.659358]';
cam_dir      = [0.568983, 0.411289, -0.71211]';
cam_up       = [-0.757647, -0.0745048, -0.648398]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.425248, -1.20825, -0.358063]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;