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<p class="MsoNormal"><span style="font-family:Consolas">Dear All,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas">It seems like vtkLookupTable does not handle correclty NaN values when the Log10 scale is used.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas">In this case, all the NaNs in the input are not mapped to NanColor but to the minimum range color.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas">Unless there is a reason for this, I believe the bug is in vtkLookupTable::vtkApplyLogScale().<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas">Here is a patch that might fix it (VTK 6.3.0)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-family:Consolas">--- old/vtkLookupTable.cxx Wed Jul 13 15:11:08 2016<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-family:Consolas">+++ new/vtkLookupTable.cxx Wed Sep 21 10:54:24 2016<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-family:Consolas">@@ -358,6 +358,11 @@<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-family:Consolas">inline double vtkApplyLogScale(double v, const double range[2],<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-family:Consolas"> const double logRange[2])<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-family:Consolas">{<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-family:Consolas">+ if (vtkMath::IsNan(v))<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-family:Consolas">+ {<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-family:Consolas">+ return v;<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-family:Consolas">+ }<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-family:Consolas">+
<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-family:Consolas"> // is the range set for negative numbers?<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-family:Consolas"> if (range[0] < 0)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-family:Consolas"> {<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas">Federico<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="IT" style="font-size:18.5pt;font-family:"Arial","sans-serif";color:#0093D0;mso-fareast-language:IT">______</span></b><b><span lang="IT" style="font-size:18.5pt;font-family:"Arial","sans-serif";color:#6A737B;mso-fareast-language:IT">
</span></b><b><span lang="IT" style="font-size:18.5pt;font-family:"Arial","sans-serif";color:#8CC63F;mso-fareast-language:IT">______</span></b><b><span lang="IT" style="font-size:18.5pt;font-family:"Arial","sans-serif";color:#6A737B;mso-fareast-language:IT">
</span></b><b><span lang="IT" style="font-size:18.5pt;font-family:"Arial","sans-serif";color:#FCB034;mso-fareast-language:IT">______</span></b><b><span lang="IT" style="font-size:18.5pt;font-family:"Arial","sans-serif";color:#6A737B;mso-fareast-language:IT"><o:p></o:p></span></b></p>
<p class="MsoNormal"><span lang="IT" style="color:#404040;mso-fareast-language:IT">Federico Miorelli</span><span lang="IT" style="mso-fareast-language:IT"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="IT" style="color:#1F497D;mso-fareast-language:IT"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="IT" style="color:#1F497D;mso-fareast-language:IT">Senior R&D Geophysicist<o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;color:#1F497D;mso-fareast-language:EN-GB">Subsurface Imaging - General Geophysics
</span></b><b><span style="font-size:9.0pt;color:#1F497D;mso-fareast-language:EN-GB">Italy</span></b><span style="font-size:8.0pt;color:#404040;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;color:#404040;mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
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it from your system. Any review, disclosure, copying, distribution, or use of the email by others is strictly prohibited.<o:p></o:p></span></i></p>
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