cam_pos      = [-0.497082, 1.10805, 1.70582]';
cam_dir      = [0.97555, 0.197544, -0.09632]';
cam_up       = [-0.178977, 0.96844, 0.173469]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.169639, 0.202144, -1.30356]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;