cam_pos      = [0.367265, 1.4686, 0.861683]';
cam_dir      = [0.192237, -0.0399414, 0.980535]';
cam_up       = [-0.0234691, 0.998699, 0.0452824]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.30482, 0.042184, -0.254097]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;