cam_pos      = [-0.270239, 2.04891, -0.204065]';
cam_dir      = [0.685308, -0.218105, 0.694826]';
cam_up       = [-0.0522895, 0.9369, 0.345665]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.966077, 0.363381, -0.838779]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;