named input output mismatch

[YoHoSo]

vivotk read ./my_test/ply_b +output=plyb to_png -o ./my_test/ply_b/png +input=plya

Since the named input is plya, but the named output is plyb.

When there is a mismatch here, the to_png will get no input and blindly wait for input forever.

vivotk to_png -o ./my_test/ply_b/png

If we the input is not specified, it will also blindly wait for input forever.

This is found during testing and should be fixed soon.

[YoHoSo]

resolved