[vtkusers] reasons of limitations on opacity per component and up to 4 components in label-map volume rendering?

[terminator]

Thank you,
I read that link (about SetMaskInput) and I have no problem with controlling
components color.
But about opacity, I mean that I want to control opacity of each component
separately just like components' colors by different PieseWiseFunctions.
I use
SetScalarOpacity(0,...),SetScalarOpacity(1,...),SetScalarOpacity(2,...),...
but just first one affects on the volume. I cannot hide component 0,make
component 1 semi-transparent  and component 2 opaque.



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