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<p>Thanks, Mathieu,</p>
<p>I can do that. I might not have been very clear in the first
paragraph, but the unexpected behavior comes from VTK. Paraview
was mentioned here only as a simple way to reproduce the problem,
and as an example. I'd like to avoid bothering too many people at
once, but if you still think I should re-post, I can do that.</p>
<p>Thanks,</p>
<p>Marcin</p>
<br>
<div class="moz-cite-prefix">On 10/15/2018 10:21 AM, Mathieu
Westphal wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAC2t4US1WfbD6ejQ-rcpdfrv9Otja89rsobhMBxyKkidPbCutw@mail.gmail.com">
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<div dir="ltr">
<div dir="ltr">Hi Marcin,
<div><br>
</div>
<div>Regarding ParaView, you may want to post on our discourse
instead</div>
<div><a href="https://discourse.paraview.org/"
moz-do-not-send="true">https://discourse.paraview.org/</a></div>
<div><br>
</div>
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<div dir="ltr" class="gmail_signature">
<div dir="ltr">Mathieu Westphal<br>
</div>
</div>
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<br>
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<br>
<div class="gmail_quote">
<div dir="ltr">On Mon, Oct 15, 2018 at 9:38 AM
marcin.krotkiewski <<a
href="mailto:marcin.krotkiewski@gmail.com"
moz-do-not-send="true">marcin.krotkiewski@gmail.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,<br>
<br>
I think the behavior of UseBelowRangeColor in both VTK 8.1.1,
and <br>
Parview 5.5 is wrong. As an example, I load a surface into
Paraview, <br>
rescale the color range to point data (elevation in this case,
fig. <br>
paraview.png), and enable the 'Use Below Range Color'
checkbox. What you <br>
see is that part of the surface are colored with black (fig. <br>
paraview_wrong.png), although they are in fact within the
automatically <br>
computed value range. So they should get the usual color from
the lookup <br>
table.<br>
<br>
I also observe wrong behavior when I color the surface by a
constant <br>
value. In VTK, I set lower/upper bound on data values in
vtkLookupTable <br>
to be the same. Say, my point data has value 50. I set the
lookup table <br>
range to [60,60] and turn on Above/Below range color. Figure <br>
constant_wrong.png shows that my surface is colored with the
in-range <br>
color, although it is below range. To get a correct coloring I
need to <br>
spread the range a little bit, e.g., [60,61]
(constant_below.png), or <br>
[40, 41] (constant_above.png). But even in this case we go
back to the <br>
first problem: for point values that are on the edge of the
range VTK <br>
uses out-of-range color (range [50,51], constant_extreme.png).<br>
<br>
So the question is - is this behavior intended, and if so -
how should I <br>
organize my color mapping and data ranges to get the expected
behavior?<br>
<br>
Regards,<br>
<br>
Marcin Krotkiewski<br>
<br>
<br>
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