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Hi Hila,
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<div>I understand better about your problem now.</div>
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<div>You want to group your vertices on a surface according to some distance?</div>
<div>Can you search of a seed vertex(point) with extreme coordinates along one axis (x, or y, or z).</div>
<div>And then use the Euclidean distance to classify vertices?</div>
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<div>Maybe the problem you are facing is more complicated than this.</div>
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<div>Hope it helps though,</div>
<div>Wen</div>
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<div>On May 1, 2012, at 7:49 AM, Hila Hiler wrote:</div>
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Hi Wen, <br>
many thanks for your answer.<br>
<br>
I've read about kDTree and wondered if the OcTree is better (I have a 3D image).<br>
please detail (if you know) why KdTree is better than OcTree or the opposite ...<br>
<br>
regarding my first q: <br>
-------------------------<br>
my data structure:<br>
vtkPolyData <=> vtkFloatArray <=> Scalars<br>
<br>
I'm searching for a method that divides the poly to regions (how do I insert the number of the required regions) and returns the indexes (vtkIdType) + its corresponding scalar (float) in each region.
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How I can get this?<br>
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Best and thanks in advance.<br>
Hila<br>
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<div class="gmail_quote">On Sun, Apr 29, 2012 at 10:32 PM, Li, Wen <span dir="ltr">
<<a href="mailto:wen-li@uiowa.edu" target="_blank">wen-li@uiowa.edu</a>></span> wrote:<br>
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<div style="word-wrap:break-word">Hila,
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<div>Is <span style="white-space:nowrap">vtkKdTreePointLocator::FindPointsWithinRadius going to help you?</span></div>
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</span></div>
<div><font face="Geneva, Arial, Helvetica, sans-serif"><span style="white-space:nowrap">You can exclude points within a specific radius and the rest points on the surface are beyond that value.</span></font></div>
<div><font face="Geneva, Arial, Helvetica, sans-serif"><span style="white-space:nowrap"><br>
</span></font></div>
<div><font face="Geneva, Arial, Helvetica, sans-serif"><span style="white-space:nowrap">You are right about the point ids. neighboring points could have very different point Ids.</span></font></div>
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</span></font></div>
<div><font face="Geneva, Arial, Helvetica, sans-serif"><span style="white-space:nowrap">Good Luck,</span></font></div>
<div><font face="Geneva, Arial, Helvetica, sans-serif"><span style="white-space:nowrap">Wen</span></font></div>
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<div class="h5">
<div>On Apr 29, 2012, at 2:21 PM, Hila Hiler wrote:</div>
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<div dir="ltr">Hi All,<br>
<br>
I'd like to get some <b>distant points</b> on a surface (in this case, a head).<br>
How do I know what the distance value should be?<br>
<br>
Actually, in my program I use this type: vtkIdType and with a loop move on a vtkPolyData.<br>
I tried to guess a number (5000), presented the points on the surface but realized that even that those points look very close, their indexes are faraway from each other- so I guess that I don't have a clue about it :-)<br>
<br>
<br>
so, any idea how I should find indexes/points which are faraway from each other on a surface ?<br>
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<br>
Thanks in advance.<br>
<br>
Hila <br>
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