[Paraview] Bug for vti in Paraview 4.3

[Gabe Weymouth]

Great. Thanks for letting me know.

*Gabriel D Weymouth*
Southampton Marine and Maritime Institute Lecturer
University of Southampton
Boldrewood Campus, Building 176, Room 3029
Southampton, SO16 7QF, UK

On Thu, Aug 13, 2015 at 5:25 AM, Berk Geveci <berk.geveci at kitware.com>
wrote:

> I have a fix for the clip issue in the works - clip has not worked with 2D
> image data in quite a while. There is another bug where clip crashes unless
> the 2D image is on the x-y plane. We will work on a fix for that also.
>
> Best,
> -berk
>
> On Thu, Jun 18, 2015 at 7:43 AM, Gabe Weymouth <G.D.Weymouth at soton.ac.uk
> <mailto:G.D.Weymouth at soton.ac.uk>> wrote:
> I downloaded the newest stable build of paraview yesterday (upgrading from
> 4.1) so I could utilize the new features in pvpython (Screenshot, etc).
> Unfortunately, I ran into what appears to be a bug in the handling of
> clipping/opacity for vti files.
>
> I have a 2D field that ranges from -20 to 110 and I need to isolate the
> negative regions and discard the positive regions. I do this by clipping
> (type: scalar, value: 0, inside out). In the new version, this clips the
> entire field - nothing remains.
>
> An alternative method that smooths out the transition is to map the scalar
> from -2 to 2, setting zero opacity at 2. In the new version of paraview,
> this blanks out both the positive and negative values, leaving only the
> region between -2 to 2. A color map without opacity works as expected, and
> the legend shows the correct opacity behaviour.
>
> Playing around with the range of the transfer function, the negative
> values begin to blank out when the positive limit is set below 20. This
> would seem to indicate a bug in the application of the transfer function to
> the image grid surface render.
>
> If I repeat the tests using a vtr file and identical data, both clipping
> and opacity work as expected. I see the same results on my mac and linux
> workstation.
>
>
> Gabriel D Weymouth
> Southampton Marine and Maritime Institute Lecturer
> University of Southampton
> Boldrewood Campus, Building 176, Room 3029
> Southampton, SO16 7QF, UK
>
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