[vtkusers] Smoothing Surface

[Andras Lasso]

You can use the joint smoothing method implemented in 3D Slicer to make independent meshes smoother while keeping their interface airtight. The key idea is to create a merged polydata, smooth it, and split it.

Sample images:

  *   Before: https://www.dropbox.com/s/819nenm7kpb09tz/1-before-joint-smoothing.png?dl=0
  *   After: https://www.dropbox.com/s/7o0ijjk1kfz7ha2/2-after-joint-smoothing.png?dl=0

You can try it by downloading&installing 3D Slicer and following these steps:

  *   go to Segment Editor module
  *   draw a few segments
  *   click Show 3D to see segments as surface meshes in 3D
  *   select Smoothing effect, Joint smoothing method, and click Apply

Source code:
https://github.com/Slicer/Slicer/blob/1b713d1701dea926134ec6366134fa3e08caf21e/Modules/Loadable/Segmentations/EditorEffects/Python/SegmentEditorSmoothingEffect.py#L262-L351

Andras

From: vtkusers [mailto:vtkusers-bounces at vtk.org] On Behalf Of Henan Zhao
Sent: Friday, December 15, 2017 10:57 PM
To: Bill Lorensen <bill.lorensen at gmail.com>
Cc: VTK Users <vtkusers at vtk.org>
Subject: Re: [vtkusers] Smoothing Surface

Thanks!
I have one more question about smoothing a surface.

If a surface is made up by two shapes, like a semi-sphere and a plane.
Is there a good way to smooth the original connectivity between the two shapes in VTK?
For example, assuming that I locate a semi-sphere on the top of a plane, I expect that the angle on the connectivity part is 90 degree.
However, the connectivity part is also smoothed and the angle is larger than 90 degree after I use the smoothing algorithm.



On Fri, Dec 15, 2017 at 5:57 PM, Bill Lorensen <bill.lorensen at gmail.com<mailto:bill.lorensen at gmail.com>> wrote:
Try this:
https://lorensen.github.io/VTKExamples/site/Cxx/Meshes/WindowedSincPolyDataFilter/<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Florensen.github.io%2FVTKExamples%2Fsite%2FCxx%2FMeshes%2FWindowedSincPolyDataFilter%2F&data=02%7C01%7Classo%40queensu.ca%7Cae6e57d7c92447bc7d9108d54439083b%7Cd61ecb3b38b142d582c4efb2838b925c%7C1%7C0%7C636489934105797878&sdata=6T8MC0OcDmSQYSSdvLiLdOJoRK1P7O6fRkb0vcp8qP0%3D&reserved=0>



On Fri, Dec 15, 2017 at 4:40 PM, Henan Zhao <henan1 at umbc.edu<mailto:henan1 at umbc.edu>> wrote:

Hi,

I met a problem when using vtkSmoothPolyDataFilter.
I want to use this filter to smooth a mesh, and I want to have a new mesh which is outside the original one.

However, the new mesh I got is inside the original one.
Here is a figure: the white wireframe is my original mesh, and the white solid surface is the new one using vtkSmoothPolyDataFilter.

[Inline image 1]



I am wondering if there is a parameter I should set or any other filters I should use.

Thank you in advance.

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Unpaid intern in BillsBasement at noware dot com



--
Henan Zhao
Website: http://www.csee.umbc.edu/~henan1/<https://na01.safelinks.protection.outlook.com/?url=http:%2F%2Fwww.csee.umbc.edu%2F~henan1%2F&data=02%7C01%7Classo%40queensu.ca%7Cae6e57d7c92447bc7d9108d54439083b%7Cd61ecb3b38b142d582c4efb2838b925c%7C1%7C0%7C636489934105797878&sdata=E4MyCK5cJY4zgbyX%2B6nfRgi4wDFDzyPK3LzOAtDGuyI%3D&reserved=0>
Graduate student, Dept. of Computer Science and Electrical Engineering,
University of Maryland, Baltimore County
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