Re: [Paraview] Delaunay 3D filter too slow

2013-09-29 Thread Moreland, Kenneth
 paraview@paraview.orgmailto:paraview@paraview.org 
 mailto:paraview@paraview.orgmailto:paraview@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 kmo...@sandia.govmailto:kmo...@sandia.gov
 mailto:kmo...@sandia.govmailto:kmo...@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.orghttp://paraview.org 
 http://paraview.org or did you
 build your own?

 -Ken

 From: 庞庆源 
 pangqingyuan1...@gmail.commailto:pangqingyuan1...@gmail.com
 
 mailto:pangqingyuan1...@gmail.commailto:pangqingyuan1...@gmail.com
 Date: Tuesday, September 24, 2013 10:29 PM
 To: Kenneth Moreland kmo...@sandia.govmailto:kmo...@sandia.gov 
 mailto:kmo...@sandia.govmailto:kmo...@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 
 kmo...@sandia.govmailto:kmo...@sandia.gov
 mailto:kmo...@sandia.govmailto:kmo...@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 
 pangqingyuan1...@gmail.commailto:pangqingyuan1...@gmail.com
 
 mailto:pangqingyuan1...@gmail.commailto:pangqingyuan1...@gmail.com
 Date: Tuesday, September 24, 2013 5:01 AM
 To: paraview paraview@paraview.orgmailto:paraview@paraview.org
 mailto:paraview@paraview.orgmailto:paraview@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:pangqingyuan1...@gmail.com
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Re: [Paraview] Delaunay 3D filter too slow

2013-09-28 Thread Karl König
庞庆源,

I found some spare time to look into this.

The test data set you provided defines a point cloud with spherical
topology. Your reader does import this geometric information (as
points), but provides no topology. In order for VTK and hence ParaView
to display anything, some kind of topology is needed. The simplest being
vertices as 0D topology, i.e. a dot per point. The patch attached does
exactly add that. With this, you can already see something in ParaView
when using your reader plugin to import the test data set.

You've been trying to triangulate your point cloud with spherical
topology with Delaunay3D, in vain. I could reproduce that. With a debug
build of ParaView, one notices thousands of warnings of kind Unable to
factor linear system being issued when trying to apply Delaunay3D
filter to your input.

The same actually happens when applying Delaunay3D filter to a sphere
source created with theta resolution 180 and phi resolution 90.
A few dozen warnings about being unable to factor a linear system are
raised. (On a side node: a debug build of ParaView master branch with
CMake option VTK_DEBUG_LEAKS:BOOL=ON reveals a memory leak in Delaunay3D
when applied to this densely meshed sphere.) The result, however, is
disappointing as the volume mesh has some gaps and rifts, not really a
smooth surface any more. So, you need to pursue another triangulation
approach.

Applying Delaunay2D filter instead produces at least a hemisphere,
almost instantly. I suspect, however, that a hemisphere is not good
enough.

You could resort to applying a Glyph filter with Glyph type Sphere and
otherwise default settings. That yields a coarse approximation of what I
guess you would like to achieve.

It might also be that class vtkSurfaceReconstructionFilter or class
vtkMarchingCubes or one of the filters from the pv-meshless plugin are
able to create the surface mesh, but I'm not too familiar with them to
say this with confidence or provide additional advice.

There have recently even been a few discussions on the VTK mailing list
regarding the general problem of triangulating point clouds with
spherical topology, see e.g.
http://markmail.org/message/fc3kjifkwtpggqai

But given that your points are not arbitrarily distributed over the
sphere, but in fact stored in your input file in a very regular and pre-
sorted way (180 points per latitude, latitude after latitude from pole
to pole) and given that the implied topology is very simple too (every
vertex has exactly 4 neighbors), it is not too hard to extend your
reader to have it create a smooth triangulation of the surface by simple
quads (connecting vertex i with i+1, i+181 and i+180) without involving
the help from additional VTK meshing classes.

Maybe someone else on the list can even tell you how to re-arrange your
data to fulfill the prerequisites for a structured grid data set for
which the triangulation is implicitly done by VTK.

Hope this helps,
Karl



庞庆源 wrote, On 27.09.2013 02:46:
 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 kmo...@sandia.gov mailto:kmo...@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 pangqingyuan1...@gmail.com
 mailto:pangqingyuan1...@gmail.com
 Date: Thursday, September 26, 2013 3:05 AM
 To: Kenneth Moreland kmo...@sandia.gov mailto:kmo...@sandia.gov
 Cc: paraview@paraview.org mailto:paraview@paraview.org
 paraview@paraview.org mailto:paraview@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 kmo...@sandia.gov
 mailto:kmo...@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 pangqingyuan1...@gmail.com
 mailto:pangqingyuan1...@gmail.com
 Date: Tuesday, September 24, 2013 10:29 PM
 To: Kenneth Moreland kmo...@sandia.gov mailto:kmo...@sandia.gov
 Subject: [EXTERNAL] Re: [Paraview] Delaunay 3D filter too slow
 
 in fact,I

Re: [Paraview] Delaunay 3D filter too slow

2013-09-28 Thread 庞庆源
I have an extra question.Both my reader and Delaunay3D filter are subclass
from vtkUnstructuredGridAlgorithm.But when I test with 8 vertices of a
cube,my reader renders a hollow cube.But why can Delaunay3D filter render a
solid cube?I have checked the Delaunay3D source file,but can not find the
answer.


2013/9/29 Karl König kkoeni...@web.de

 庞庆源,

 I found some spare time to look into this.

 The test data set you provided defines a point cloud with spherical
 topology. Your reader does import this geometric information (as
 points), but provides no topology. In order for VTK and hence ParaView
 to display anything, some kind of topology is needed. The simplest being
 vertices as 0D topology, i.e. a dot per point. The patch attached does
 exactly add that. With this, you can already see something in ParaView
 when using your reader plugin to import the test data set.

 You've been trying to triangulate your point cloud with spherical
 topology with Delaunay3D, in vain. I could reproduce that. With a debug
 build of ParaView, one notices thousands of warnings of kind Unable to
 factor linear system being issued when trying to apply Delaunay3D
 filter to your input.

 The same actually happens when applying Delaunay3D filter to a sphere
 source created with theta resolution 180 and phi resolution 90.
 A few dozen warnings about being unable to factor a linear system are
 raised. (On a side node: a debug build of ParaView master branch with
 CMake option VTK_DEBUG_LEAKS:BOOL=ON reveals a memory leak in Delaunay3D
 when applied to this densely meshed sphere.) The result, however, is
 disappointing as the volume mesh has some gaps and rifts, not really a
 smooth surface any more. So, you need to pursue another triangulation
 approach.

 Applying Delaunay2D filter instead produces at least a hemisphere,
 almost instantly. I suspect, however, that a hemisphere is not good
 enough.

 You could resort to applying a Glyph filter with Glyph type Sphere and
 otherwise default settings. That yields a coarse approximation of what I
 guess you would like to achieve.

 It might also be that class vtkSurfaceReconstructionFilter or class
 vtkMarchingCubes or one of the filters from the pv-meshless plugin are
 able to create the surface mesh, but I'm not too familiar with them to
 say this with confidence or provide additional advice.

 There have recently even been a few discussions on the VTK mailing list
 regarding the general problem of triangulating point clouds with
 spherical topology, see e.g.
 http://markmail.org/message/fc3kjifkwtpggqai

 But given that your points are not arbitrarily distributed over the
 sphere, but in fact stored in your input file in a very regular and pre-
 sorted way (180 points per latitude, latitude after latitude from pole
 to pole) and given that the implied topology is very simple too (every
 vertex has exactly 4 neighbors), it is not too hard to extend your
 reader to have it create a smooth triangulation of the surface by simple
 quads (connecting vertex i with i+1, i+181 and i+180) without involving
 the help from additional VTK meshing classes.

 Maybe someone else on the list can even tell you how to re-arrange your
 data to fulfill the prerequisites for a structured grid data set for
 which the triangulation is implicitly done by VTK.

 Hope this helps,
 Karl



 庞庆源 wrote, On 27.09.2013 02:46:
  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 kmo...@sandia.gov mailto:kmo...@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 pangqingyuan1...@gmail.com
  mailto:pangqingyuan1...@gmail.com
  Date: Thursday, September 26, 2013 3:05 AM
  To: Kenneth Moreland kmo...@sandia.gov mailto:kmo...@sandia.gov
  Cc: paraview@paraview.org mailto:paraview@paraview.org
  paraview@paraview.org mailto:paraview@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 kmo...@sandia.gov
  mailto:kmo...@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

Re: [Paraview] Delaunay 3D filter too slow

2013-09-27 Thread 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 pangqingyuan1...@gmail.commailto:pangqingyuan1...@gmail.com
Date: Thursday, September 26, 2013 6:46 PM
To: Kenneth Moreland kmo...@sandia.govmailto:kmo...@sandia.gov
Cc: paraview@paraview.orgmailto:paraview@paraview.org 
paraview@paraview.orgmailto:paraview@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 kmo...@sandia.govmailto:kmo...@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.orghttp://paraview.org or did you build your own?

-Ken

From: 庞庆源 pangqingyuan1...@gmail.commailto:pangqingyuan1...@gmail.com
Date: Thursday, September 26, 2013 3:05 AM
To: Kenneth Moreland kmo...@sandia.govmailto:kmo...@sandia.gov
Cc: paraview@paraview.orgmailto:paraview@paraview.org 
paraview@paraview.orgmailto:paraview@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 kmo...@sandia.govmailto:kmo...@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.orghttp://paraview.org or did you build your own?

-Ken

From: 庞庆源 pangqingyuan1...@gmail.commailto:pangqingyuan1...@gmail.com
Date: Tuesday, September 24, 2013 10:29 PM
To: Kenneth Moreland kmo...@sandia.govmailto:kmo...@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 kmo...@sandia.govmailto:kmo...@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 pangqingyuan1...@gmail.commailto:pangqingyuan1...@gmail.com
Date: Tuesday, September 24, 2013 5:01 AM
To: paraview paraview@paraview.orgmailto:paraview@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:pangqingyuan1...@gmail.com



--
庞庆源mailto:pangqingyuan1...@gmail.com



--
庞庆源mailto:pangqingyuan1...@gmail.com



--
庞庆源mailto:pangqingyuan1...@gmail.com
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Re: [Paraview] Delaunay 3D filter too slow

2013-09-26 Thread 庞庆源
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 kmo...@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 or did you build your own?

  -Ken

   From: 庞庆源 pangqingyuan1...@gmail.com
 Date: Tuesday, September 24, 2013 10:29 PM
 To: Kenneth Moreland kmo...@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 kmo...@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 pangqingyuan1...@gmail.com
 Date: Tuesday, September 24, 2013 5:01 AM
 To: paraview paraview@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 pangqingyuan1...@gmail.com




  --
 庞庆源 pangqingyuan1...@gmail.com




-- 
庞庆源 pangqingyuan1...@gmail.com
___
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Re: [Paraview] Delaunay 3D filter too slow

2013-09-26 Thread Moreland, Kenneth
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 or did you build your own?

-Ken

From: 庞庆源 pangqingyuan1...@gmail.commailto:pangqingyuan1...@gmail.com
Date: Thursday, September 26, 2013 3:05 AM
To: Kenneth Moreland kmo...@sandia.govmailto:kmo...@sandia.gov
Cc: paraview@paraview.orgmailto:paraview@paraview.org 
paraview@paraview.orgmailto:paraview@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 kmo...@sandia.govmailto:kmo...@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.orghttp://paraview.org or did you build your own?

-Ken

From: 庞庆源 pangqingyuan1...@gmail.commailto:pangqingyuan1...@gmail.com
Date: Tuesday, September 24, 2013 10:29 PM
To: Kenneth Moreland kmo...@sandia.govmailto:kmo...@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 kmo...@sandia.govmailto:kmo...@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 pangqingyuan1...@gmail.commailto:pangqingyuan1...@gmail.com
Date: Tuesday, September 24, 2013 5:01 AM
To: paraview paraview@paraview.orgmailto:paraview@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:pangqingyuan1...@gmail.com



--
庞庆源mailto:pangqingyuan1...@gmail.com



--
庞庆源mailto:pangqingyuan1...@gmail.com
___
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Visit other Kitware open-source projects at 
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Re: [Paraview] Delaunay 3D filter too slow

2013-09-25 Thread Moreland, Kenneth
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 or did you build your own?

-Ken

From: 庞庆源 pangqingyuan1...@gmail.commailto:pangqingyuan1...@gmail.com
Date: Tuesday, September 24, 2013 10:29 PM
To: Kenneth Moreland kmo...@sandia.govmailto:kmo...@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 kmo...@sandia.govmailto:kmo...@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 pangqingyuan1...@gmail.commailto:pangqingyuan1...@gmail.com
Date: Tuesday, September 24, 2013 5:01 AM
To: paraview paraview@paraview.orgmailto:paraview@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:pangqingyuan1...@gmail.com



--
庞庆源mailto:pangqingyuan1...@gmail.com
___
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Re: [Paraview] Delaunay 3D filter too slow

2013-09-24 Thread Moreland, Kenneth
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 pangqingyuan1...@gmail.commailto:pangqingyuan1...@gmail.com
Date: Tuesday, September 24, 2013 5:01 AM
To: paraview paraview@paraview.orgmailto:paraview@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:pangqingyuan1...@gmail.com
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