cam_pos      = [0.133333, 1.43656, 0.331234]';
cam_dir      = [-0.824144, -0.102426, 0.557042]';
cam_up       = [-0.154585, 0.986849, -0.0472506]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.724686, 0.166318, 1.10275]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;