[vtkusers] Show/Hide voxels based on combination of two scalars

[David E DeMarle]

Simplest way to do it is probably two threshold filters. One on x, the the
other on y (either order). Then specify the color as normal with y as the
input to the lookup table. Another alternative that comes to mind is using
a vtkArrayCalculator with an if(condition,true_expression,false_expression)
to make a derived attribute that you cull off of directly.



David E DeMarle
Kitware, Inc.
R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909


On Tue, Sep 17, 2013 at 2:45 AM, Perryn Fowler <pezlists at gmail.com> wrote:

>
> I have some volume data that has 2 scalar values (x and y) at each voxel.
>
> I want to be able to render the volume where the colour is determined by
> the x value.
> I also want to be able to show only parts of the volume that meet range
> criteria on both values. I don't mind if this is done via thresholding or
> opacity.
>
> For example, I want to be able to say thing like:
>
> "Only show voxels for which the x value is between 10 and 20 AND the y
> value is between 0.5 and 0.6. Set the colour of the shown voxels based on
> the x value"
>
> I have confused myself looking through the documentation to see if this
> can be done - any pointers would be greatly appreciated :)
>
> cheers
> Perryn
>
>
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