[Paraview] Delaunay 3D filter too slow

[Moreland, Kenneth]

Did you build ParaView in Release mode (CMAKE_BUILD_TYPE = Release)? That can make a huge difference in run times.

-Ken

From: 庞庆源 <pangqingyuan1991 at gmail.com<mailto:pangqingyuan1991 at gmail.com>>
Date: Thursday, September 26, 2013 6:46 PM
To: Kenneth Moreland <kmorel at sandia.gov<mailto:kmorel at sandia.gov>>
Cc: "paraview at paraview.org<mailto:paraview at paraview.org>" <paraview at paraview.org<mailto:paraview at paraview.org>>
Subject: [EXTERNAL] Re: [Paraview] Delaunay 3D filter too slow

This is the source of my test plugin.Could you have a try?
My paraview version is 4.0.1 ,built from source.


2013/9/27 Moreland, Kenneth <kmorel at sandia.gov<mailto:kmorel at sandia.gov>>
I doubt that would make a difference. I just tried a bimodal distribution using two point sources, and the filter still executed in about the same amount of time.

So what version of ParaView are you using? Are you using a binary downloaded from paraview.org<http://paraview.org> or did you build your own?

-Ken

From: 庞庆源 <pangqingyuan1991 at gmail.com<mailto:pangqingyuan1991 at gmail.com>>
Date: Thursday, September 26, 2013 3:05 AM
To: Kenneth Moreland <kmorel at sandia.gov<mailto:kmorel at sandia.gov>>
Cc: "paraview at paraview.org<mailto:paraview at paraview.org>" <paraview at paraview.org<mailto:paraview at paraview.org>>

Subject: [EXTERNAL] Re: [Paraview] Delaunay 3D filter too slow

My points are not Uniform distribution.They take from intersections of 89 wefts and 180 warps.So the points are intensive at poles and sparse at equator.Is this the problem?


2013/9/25 Moreland, Kenneth <kmorel at sandia.gov<mailto:kmorel at sandia.gov>>
That is strange. I cannot replicate your problem. I used a point source to create 16020 random points in a sphere, and the Delaunay triangulation took only about 2 seconds. My processor might be a bit better than yours, but not anywhere near enough to explain the difference.

What version of ParaView are you using? Are you a binary downloaded from paraview.org<http://paraview.org> or did you build your own?

-Ken

From: 庞庆源 <pangqingyuan1991 at gmail.com<mailto:pangqingyuan1991 at gmail.com>>
Date: Tuesday, September 24, 2013 10:29 PM
To: Kenneth Moreland <kmorel at sandia.gov<mailto:kmorel at sandia.gov>>
Subject: [EXTERNAL] Re: [Paraview] Delaunay 3D filter too slow

in fact,I have only 16020 points for test.My cpu is AMD Athlon(tm) II P320 Dual-Core Processor with 2.1GHz.How long will it take in this case if I use one cpu to calculate?I have wait for more than 10 minutes before stopping it.


2013/9/24 Moreland, Kenneth <kmorel at sandia.gov<mailto:kmorel at sandia.gov>>
Your options are probably either to wait or do something else. Delaunay triangulation is a pretty heavyweight operation and in general it is not trivial to impose a topology on a collection of points.

You might rethink whether you really need to create a solid sphere in the first place. I'm guessing you have at least around 100,000 points (or else Delaunay probably would not be that slow). If you just render these points as a cloud of points, you should get enough occlusion for it to look pretty much like a sphere.

-Ken

From: 庞庆源 <pangqingyuan1991 at gmail.com<mailto:pangqingyuan1991 at gmail.com>>
Date: Tuesday, September 24, 2013 5:01 AM
To: paraview <paraview at paraview.org<mailto:paraview at paraview.org>>
Subject: [EXTERNAL] [Paraview] Delaunay 3D filter too slow

I have a lot of points taking sample from a solid sphere.So I want to use Delaunay 3D filter to render the shpere with known scalars of the points.But it took me so much time.What should I do?

--
庞庆源<mailto:pangqingyuan1991 at gmail.com>



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庞庆源<mailto:pangqingyuan1991 at gmail.com>



--
庞庆源<mailto:pangqingyuan1991 at gmail.com>



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庞庆源<mailto:pangqingyuan1991 at gmail.com>
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