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By the way, the example following that is buggy as well, when you
apply an internal filter you first need to shallow copy the input. <br>
<br>
I fixed both of these, although I think these examples(ones in
Examples section) are not great ones in the first place and don't
add much to the already pretty comprehensive examples preceding
them, I would vote to remove them. However, I'll leave this up to
the real pv developers....<br>
<br>
<div class="moz-cite-prefix">On 05/16/2014 01:43 PM, Su, Simon M CTR
USARMY ARL (US) wrote:<br>
</div>
<blockquote
cite="mid:F02E4EC9F4B4BA4189BBDC8BF3B2AD820ECE7D41@umechp9h.easf.csd.disa.mil"
type="cite">
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charset=ISO-8859-1">
<div style="direction: ltr;font-family: Tahoma;color:
#000000;font-size: 10pt;">Thanks Burlen<br>
-simon<br>
<br>
<div style="font-family: Times New Roman; color: #000000;
font-size: 16px">
<hr tabindex="-1">
<div style="direction: ltr;" id="divRpF695062"><font
face="Tahoma" size="2" color="#000000"><b>From:</b> Burlen
Loring [<a class="moz-txt-link-abbreviated" href="mailto:bloring@lbl.gov">bloring@lbl.gov</a>]<br>
<b>Sent:</b> Friday, May 16, 2014 4:23 PM<br>
<b>To:</b> Su, Simon M CTR USARMY ARL (US);
<a class="moz-txt-link-abbreviated" href="mailto:paraview@paraview.org">paraview@paraview.org</a><br>
<b>Subject:</b> Re: [Paraview] Accessing a specific
variable in Python Programmable Filter<br>
</font><br>
</div>
<div>
<blockquote type="cite">=============================<br>
<div dir="ltr" class="mw-geshi" style="text-align:left">
<div class="python source-python">
<pre class="de1"><span class="kw2">input</span> = <span class="kw2">self</span>.<span class="me1">GetPolyDataInput</span><span class="br0">(</span><span class="br0">)</span><span class="sy0">;</span>
output = <span class="kw2">self</span>.<span class="me1">GetPolyDataOutput</span><span class="br0">(</span><span class="br0">)</span><span class="sy0">;</span>
colors = vtk.<span class="me1">vtkUnsignedCharArray</span><span class="br0">(</span><span class="br0">)</span><span class="sy0">;</span>
colors.<span class="me1">SetNumberOfComponents</span><span class="br0">(</span><span class="nu0">3</span><span class="br0">)</span><span class="sy0">;</span>
colors.<span class="me1">SetName</span><span class="br0">(</span><span class="st0">"Colors"</span><span class="br0">)</span><span class="sy0">;</span>
numPoints = <span class="kw2">input</span>.<span class="me1">GetNumberOfPoints</span><span class="br0">(</span><span class="br0">)</span>
<span class="kw1">for</span> i <span class="kw1">in</span> <span class="kw2">range</span><span class="br0">(</span><span class="nu0">0</span>, numPoints<span class="br0">)</span>:
colors.<span class="me1">InsertNextTuple3</span><span class="br0">(</span><span class="nu0">255</span>,<span class="nu0">0</span>,<span class="nu0">0</span><span class="br0">)</span><span class="sy0">;</span>
output=<span class="kw2">input</span>
output.<span class="me1">GetPointData</span><span class="br0">(</span><span class="br0">)</span>.<span class="me1">AddArray</span><span class="br0">(</span>colors<span class="br0">)</span></pre>
</div>
</div>
===============================</blockquote>
Not sure how this got on the wiki but this is an example of
what *not* to do!!<br>
<br>
In a VTK filter one's never supposed to modify the input. <br>
<blockquote type="cite">
<pre class="de1">output=<span class="kw2">input</span>
output.<span class="me1">GetPointData</span><span class="br0">(</span><span class="br0">)</span>.<span class="me1">AddArray</span><span class="br0">(</span>colors<span class="br0">)</span></pre>
</blockquote>
This is exactly what's done here. Of course you're not going
to find the array in the filter's output if you're adding it
to the input!<br>
<br>
This code can be fixed by removing the output=input line.
With that change you should be able to see the array in
downstream filters. note, in python 2 range actually
generates a list with all the values in it, while xrange
creates an iterator which is far more efficient. To actually
use the colors you'll also have to uncheck the map scalars
check box in the display properties.<br>
<br>
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<p style="margin-top:0px; margin-bottom:0px;
margin-left:0px; margin-right:0px; text-indent:0px">
input = self.GetPolyDataInput();</p>
<p style="margin-top:0px; margin-bottom:0px;
margin-left:0px; margin-right:0px; text-indent:0px">
output = self.GetPolyDataOutput();</p>
<p style="margin-top:0px; margin-bottom:0px;
margin-left:0px; margin-right:0px; text-indent:0px">
</p>
<p style="margin-top:0px; margin-bottom:0px;
margin-left:0px; margin-right:0px; text-indent:0px">
colors = vtk.vtkUnsignedCharArray();</p>
<p style="margin-top:0px; margin-bottom:0px;
margin-left:0px; margin-right:0px; text-indent:0px">
colors.SetNumberOfComponents(3);</p>
<p style="margin-top:0px; margin-bottom:0px;
margin-left:0px; margin-right:0px; text-indent:0px">
colors.SetName("Colors");</p>
<p style="margin-top:0px; margin-bottom:0px;
margin-left:0px; margin-right:0px; text-indent:0px">
</p>
<p style="margin-top:0px; margin-bottom:0px;
margin-left:0px; margin-right:0px; text-indent:0px">
numPoints = input.GetNumberOfPoints()</p>
<p style="margin-top:0px; margin-bottom:0px;
margin-left:0px; margin-right:0px; text-indent:0px">
for i in xrange(0, numPoints):</p>
<p style="margin-top:0px; margin-bottom:0px;
margin-left:0px; margin-right:0px; text-indent:0px">
colors.InsertNextTuple3(0,255,0);</p>
<p style="margin-top:0px; margin-bottom:0px;
margin-left:0px; margin-right:0px; text-indent:0px">
</p>
<p style="margin-top:0px; margin-bottom:0px;
margin-left:0px; margin-right:0px; text-indent:0px">
output.GetPointData().AddArray(colors)</p>
<p style="margin-top:0px; margin-bottom:0px;
margin-left:0px; margin-right:0px; text-indent:0px">
del colors</p>
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<div class="moz-cite-prefix">On 05/16/2014 12:46 PM, Su,
Simon M CTR USARMY ARL (US) wrote:<br>
</div>
<blockquote type="cite">
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<div style="direction:ltr; font-family:Tahoma;
color:#000000; font-size:10pt">Hello,<br>
<br>
After staring at <a moz-do-not-send="true"
href="http://www.paraview.org/Wiki/Python_Programmable_Filter"
target="_blank">
http://www.paraview.org/Wiki/Python_Programmable_Filter</a> for a while,
the way to access the data for a specific variable name
still eludes me. This is the python code from the wiki
on Add the Colors variable to a PolyData<br>
<br>
=============================<br>
<div dir="ltr" class="mw-geshi" style="text-align:left">
<div class="python source-python">
<pre class="de1"><span class="kw2">input</span> = <span class="kw2">self</span>.<span class="me1">GetPolyDataInput</span><span class="br0">(</span><span class="br0">)</span><span class="sy0">;</span>
output = <span class="kw2">self</span>.<span class="me1">GetPolyDataOutput</span><span class="br0">(</span><span class="br0">)</span><span class="sy0">;</span>
colors = vtk.<span class="me1">vtkUnsignedCharArray</span><span class="br0">(</span><span class="br0">)</span><span class="sy0">;</span>
colors.<span class="me1">SetNumberOfComponents</span><span class="br0">(</span><span class="nu0">3</span><span class="br0">)</span><span class="sy0">;</span>
colors.<span class="me1">SetName</span><span class="br0">(</span><span class="st0">"Colors"</span><span class="br0">)</span><span class="sy0">;</span>
numPoints = <span class="kw2">input</span>.<span class="me1">GetNumberOfPoints</span><span class="br0">(</span><span class="br0">)</span>
<span class="kw1">for</span> i <span class="kw1">in</span> <span class="kw2">range</span><span class="br0">(</span><span class="nu0">0</span>, numPoints<span class="br0">)</span>:
colors.<span class="me1">InsertNextTuple3</span><span class="br0">(</span><span class="nu0">255</span>,<span class="nu0">0</span>,<span class="nu0">0</span><span class="br0">)</span><span class="sy0">;</span>
output=<span class="kw2">input</span>
output.<span class="me1">GetPointData</span><span class="br0">(</span><span class="br0">)</span>.<span class="me1">AddArray</span><span class="br0">(</span>colors<span class="br0">)</span></pre>
</div>
</div>
===============================<br>
<br>
How do I from the next filter, access the variable name
"Colors" that I created? <br>
<br>
Any help is much appreciated. <br>
<br>
thanks<br>
-simon<br>
</div>
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