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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Hi,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>This is just a suggestion that I haven’t implemented it
before with VTK.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>You may build a bidirectional list sorted by the distance from
the plane.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>If you utilize insertion sort algorithm and binary search tree
based on the sorted list, the computation will not be that heavy when you move
the plane or an object.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>You should be able to search the plane’s position at most in
10 operations with binary search tree when you use 1,000 actors.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Good luck.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Sam.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> <o:p></o:p></span></p>
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<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
vtkusers-bounces@vtk.org [mailto:vtkusers-bounces@vtk.org] <b>On Behalf Of </b>Nicolas
Rannou<br>
<b>Sent:</b> Wednesday, September 01, 2010 6:20 PM<br>
<b>To:</b> Bertrand de Boisdeffre<br>
<b>Cc:</b> vtkusers@vtk.org<br>
<b>Subject:</b> Re: [vtkusers] Show/hide actors efficiently<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks I will dig a little bit into that and let you know
how it works.<o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
<div>
<p class=MsoNormal>It could be a solution but I guess that the next question
is:<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>How do you update each assembly efficiently when you move
the plane/box..?<o:p></o:p></p>
</div>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>Let's say that while moving the plane/box an actor moves
from in front of the plane to behind the plane. (hide->show)<o:p></o:p></p>
</div>
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<p class=MsoNormal>How would you just move this single actor from an assembly
to the other without going through the whole assemblies?<o:p></o:p></p>
</div>
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<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>How long does it take to show/hide an assembly of 1000
actors?<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>I couldn't find any solution yet to only update the
visibility of the actors that the "state" is changing.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>Thanks<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal> Nicolas<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
<div>
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<div>
<p class=MsoNormal>On Sep 1, 2010, at 4:29 PM, Bertrand de Boisdeffre wrote:<o:p></o:p></p>
</div>
<p class=MsoNormal><br>
<br>
<o:p></o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'>If you know at the beginning
where actors are positionned ( behind or in front of plane ) , so you can
divide your actors in 2 assemblies. In this case, look at this class :
"vtkAssembly". This class allows to change properties for all actors
belonging to the assembly.<br>
If you try to check if the actor is behind/front of a plane and then change the
properties, I don't have solution.<o:p></o:p></p>
<div>
<p class=MsoNormal>2010/8/31 Nicolas Rannou <<a
href="mailto:nicolas_rannou@hms.harvard.edu">nicolas_rannou@hms.harvard.edu</a>><o:p></o:p></p>
<p class=MsoNormal>Hi all,<br>
<br>
I would like to show/hide actors which are:<br>
- behind or in front of a plane widget<br>
- inside or outside a box widget<br>
and to be able to interact with the widgets in real time to modify the
visibility of the actors.<br>
<br>
My main issue is that I am working with thousands of actors and checking the
bounding box of each actor appears not to be efficient enough...<br>
<br>
Would somebody know a good way to deal with high number of actors?<br>
<br>
Thanks,<br>
<br>
Nicolas<br>
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<p class=MsoNormal style='margin-bottom:12.0pt'><br>
<br clear=all>
<br>
-- <br>
Bertrand de Boisdeffre<br>
Etudiant 2A SICOM Phelma Grenoble-INP<o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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