<div dir="ltr"><p>Ok, I've put a sample up on dropbox. Note that this uses the "format=append" - I'm not sure if the binary data will be readable if you're using a different system.</p><p></p><div class="inboxsdk__compose_linkChip" style="width:396px;height:18px;max-height:18px;padding:5px;color:rgb(34,34,34);font-family:arial;font-style:normal;font-weight:bold;font-size:13px;border:1px solid rgb(221,221,221);line-height:1;background-color:rgb(245,245,245)">
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<span dir="ltr" style="color:rgb(17,85,204);text-decoration:none;vertical-align:bottom">sample.vti</span>
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<div class="gmail_quote">On Jun 18, 2015 11:10 PM, "Berk Geveci" <<a href="mailto:berk.geveci@kitware.com" target="_blank">berk.geveci@kitware.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Can you share the dataset with us?<br>
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Best,<br>
-berk<br>
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On Thu, Jun 18, 2015 at 7:43 AM, Gabe Weymouth <<a href="mailto:G.D.Weymouth@soton.ac.uk" target="_blank">G.D.Weymouth@soton.ac.uk</a><mailto:<a href="mailto:G.D.Weymouth@soton.ac.uk" target="_blank">G.D.Weymouth@soton.ac.uk</a>>> wrote:<br>
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.<br>
<br>
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.<br>
<br>
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.<br>
<br>
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.<br>
<br>
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.<br>
<br>
<br>
Gabriel D Weymouth<br>
Southampton Marine and Maritime Institute Lecturer<br>
University of Southampton<br>
Boldrewood Campus, Building 176, Room 3029<br>
Southampton, SO16 7QF, UK<br>
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