[Paraview] How to obtain the surface from points

Mon Nov 7 11:13:48 EST 2016

I’m not sure what else to suggest. It looks like a tube is there, but you cannot see it because it is imbedded within the volume. ParaView does not have a way to distinguish the tube part from the rest of the volume. Short of extracting the circles by hand or providing a custom operation to automatically find, register, and connect the circles into tubes, I don’t know how else you would do it.

-Ken

From: Chathu Gunasekera [mailto:cgunases at gmail.com]
Sent: Sunday, November 6, 2016 6:08 PM
To: Moreland, Kenneth <kmorel at sandia.gov>; ParaView <paraview at paraview.org>
Subject: [EXTERNAL] Re: [Paraview] How to obtain the surface from points

Hi,
Kenneth, here's what i got (couldn't get the tube though within the shape itself)

1st image(with surface, using 3D Delaunay filter)
[Inline image 1]

2nd image(points, using 3D Delaunay filter))
[Inline image 2]

Kenneth is it possible to get a nice tube inside , still having the surface on (Clipping thing didn't work for me :-(...)

Thank you so much in advance.
--
Warm regards,
Chathuri Gunasekera.

On Sun, Nov 6, 2016 at 6:10 AM, Chathu Gunasekera <cgunases at gmail.com<mailto:cgunases at gmail.com>> wrote:
Kenneth, thank you sooo much for your quick responses. Highly admire it. Your responses are always awesome which gives much relief. Keep up the good work. Thanks again :-)

On Sat, Nov 5, 2016 at 9:04 AM, Moreland, Kenneth <kmorel at sandia.gov<mailto:kmorel at sandia.gov>> wrote:
Like I said earlier, there is no guarantee that Delaunay will construct the tube you are expecting, but I would expect it at least give you something close. However, even if it does, it will be hard to see because it will be embedded in the larger volume. Once you build the mesh it is treated like a solid block.

You might try extracting the circles with a box clip before running Delaunay. If you could do that, it should create a tube-like structure.

You can make the surface transparent by changing the opacity parameter in the properties panel.
-Ken

Sent from my iPad so blame autocorrect.

On Nov 4, 2016, at 8:44 PM, Chathu Gunasekera <cgunases at gmail.com<mailto:cgunases at gmail.com>> wrote:
Basically, i want only 2 more things
1. I want to see those circles as a tube (because circles are technically overlapped) inside the shape

2. Then i want to see through the shells. (basically how to make the surface transparent?)

On Sat, Nov 5, 2016 at 5:03 AM, Chathu Gunasekera <cgunases at gmail.com<mailto:cgunases at gmail.com>> wrote:
Thanks for your response Ken.
That's exactly right.As these circles in the real world should look like a tube inside the shape. Since i have 3 circles, i am expecting 3 tubes inside this shape.

On Sat, Nov 5, 2016 at 1:06 AM, Moreland, Kenneth <kmorel at sandia.gov<mailto:kmorel at sandia.gov>> wrote:
Sorry, but I don’t think I understand what you are trying to or expecting to see. Do you just want to draw the circles so that you can see them inside of the shape?

-Ken

From: Chathu Gunasekera <cgunases at gmail.com<mailto:cgunases at gmail.com>>
Date: Friday, November 4, 2016 at 1:30 PM
To: "Moreland, Kenneth" <kmorel at sandia.gov<mailto:kmorel at sandia.gov>>
Cc: Jonathan Borduas <jonathan.borduas at caboma.com<mailto:jonathan.borduas at caboma.com>>, ParaView <paraview at paraview.org<mailto:paraview at paraview.org>>
Subject: [EXTERNAL] Re: [Paraview] How to obtain the surface from points

Thank you very much, Ken,
 i would like to see all the circles(which is inside the image)but  they are aligned on top of another where they looks like a small tube. Any idea how to get that?

On Sat, Nov 5, 2016 at 12:39 AM, Moreland, Kenneth <kmorel at sandia.gov<mailto:kmorel at sandia.gov>> wrote:
I’m not entirely sure what you expect to see. It’s hard to tell from the static images, but it looks like those circles are located inside of the shape, so maybe you just cannot see them.

Although Delaunay3D won’t actively find the circles and preserve them, but based on the nature of the algorithm I would expect that the circles’ connections would become edges in the final mesh. If you are trying to see the circles in the mesh, you might try the surface with edges representation. You may also need to clip or slice through your mesh to see the circles if they are in the middle.

-Ken

From: Chathu Gunasekera <cgunases at gmail.com<mailto:cgunases at gmail.com>>
Date: Friday, November 4, 2016 at 11:52 AM
To: "Moreland, Kenneth" <kmorel at sandia.gov<mailto:kmorel at sandia.gov>>
Cc: Jonathan Borduas <jonathan.borduas at caboma.com<mailto:jonathan.borduas at caboma.com>>, ParaView <paraview at paraview.org<mailto:paraview at paraview.org>>
Subject: [EXTERNAL] Re: [Paraview] How to obtain the surface from points

Hi Kenneth, you made my day. Clean to Grid filter worked like a charm. omg, thank you so much.
I have attached the input and outputs, below.
Let me ask you one last question. How to get those circles back in the 3D model? (it shd look like a tube)

INPUT as below:
[line image 2]

OUTPUT_1 as below (Delaunay3D Filter): (if i get those circles back in the below model, that will be awesome)
[line image 3]

But in OUTPUT2_Delaunay2D (has those circles)
<image003.png>

--
Warm regards,
Chathuri Gunasekera.

On Fri, Nov 4, 2016 at 7:14 PM, Moreland, Kenneth <kmorel at sandia.gov<mailto:kmorel at sandia.gov>> wrote:
That is odd. Perhaps there is point in your data that is not used in the initial geometry. Try running the Clean To Grid filter before the Delaunay filter.
-Ken

Sent from my iPad so blame autocorrect.

On Nov 3, 2016, at 10:54 PM, Chathu Gunasekera <cgunases at gmail.com<mailto:cgunases at gmail.com>> wrote:
Thank you Utkarsh and Jonathan for responding me.

In Fact, Jonathan i am clueless how to add that filter to paraview:(

Btw, i got something like this using Delauny3D filter. But there is an error (i have marked a red circle where there is no coordinate as such). Can you kindly tell me how to get rid of that point. That's the only issue that bothers me now.

--
Warm regards,
Chathuri Gunasekera.

On Fri, Nov 4, 2016 at 1:51 AM, Jonathan Borduas <jonathan.borduas at caboma.com<mailto:jonathan.borduas at caboma.com>> wrote:
Hi,

I think the filter vtkRuledSurfaceFilter is what you are looking for. However, this filter is not in the Paraview’s Filter menu.

http://www.vtk.org/doc/nightly/html/classvtkRuledSurfaceFilter.html

Cheers

From: ParaView [mailto:paraview-bounces at paraview.org<mailto:paraview-bounces at paraview.org>] On Behalf Of Utkarsh Ayachit
Sent: Thursday, November 3, 2016 3:50 PM
To: Chathu Gunasekera <cgunases at gmail.com<mailto:cgunases at gmail.com>>
Cc: ParaView <paraview at paraview.org<mailto:paraview at paraview.org>>
Subject: Re: [Paraview] How to obtain the surface from points

Alas, I am not aware of any filter in ParaView that will generate a surface from the line-source you have.

Utkarsh

On Thu, Nov 3, 2016 at 12:03 PM, Chathu Gunasekera <cgunases at gmail.com<mailto:cgunases at gmail.com>> wrote:
Thanks for your response Utkarsh.

Please see the sample data set.

Can you kindly tell me how to get a nice 3D model from this? I need to obtain the surface of the slices.

Thanks in advance.

--
Warm regards,
Chathuri Gunasekera.

On Thu, Nov 3, 2016 at 7:14 PM, Utkarsh Ayachit <utkarsh.ayachit at kitware.com<mailto:utkarsh.ayachit at kitware.com>> wrote:
It's not exactly clear what you're looking for. Maybe if you can attach a sample dataset, it may help. Thanks.

On Thu, Nov 3, 2016 at 1:53 AM, Chathu Gunasekera <cgunases at gmail.com<mailto:cgunases at gmail.com>> wrote:
Hi,

Hope all is well.

I obtained the boundary of the 3d model.

Kindly can you assist me how to obtain the surface from points.
image is attached.
<image001.png>

--
Warm regards,
Chathuri Gunasekera.

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--
Warm regards,
Chathuri Gunasekera.

--
Warm regards,
Chathuri Gunasekera.

--
Warm regards,
Chathuri Gunasekera.

--
Warm regards,
Chathuri Gunasekera.

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