[vtkusers] After a threshold need render opacity.

[Amy Squillacote]

Hi Francois,

Please keep the discussion on the vtkusers list.

In answer to your 1st question:
opacity.AddPoint(0, 1.0) will make pixels with scalar value 0 completely 
opaque. If you want them to be completely transparent, set the second 
component to 0.0.

As for your 2nd question, set the index to 0. There is a version of this 
method that only takes a vtkPiecewiseFunction*, and all that method does 
is call the 2-argument method with the 1st argument set to 0.

- Amy

Francois Louis LAILLIER wrote:
> OK thanks amy.
>
> For exemple opacity.addpoint(0,1.0) will render the black pixel
> transparent.
> That's right?
>
> I have another problem when I implement that in Visual Basic, when I add
> in my volumeproperty the color with property.setscalaropacity, VTK asks
> me two arguments, first index, second the object like opacity I think.
> I haven't index... I don't understand.
>
>
> Thank in advance
>
>
>   

-- 
Amy Squillacote
Kitware, Inc.
28 Corporate Drive
Clifton Park, NY 12065
Phone: (518) 371-3971 x106