[vtkusers] Replacing Points in polydata mesh

[Bayliss, Chris (Chicago)]

I would like the surface topology to move with the new point locations.
>From the earlier comments, it sounds like I would also have to modify
the polydata cells?  

 

Would the points->Modified() function, recalculate the cells with the
new points properly, or do I need to add some other functions to change
the cell points?

 

Thanks for your help.

 

Chris

 

 

From: Aashish Chaudhary [mailto:aashish.chaudhary at kitware.com] 
Sent: Thursday, April 12, 2012 12:48 PM
To: Andy Bauer
Cc: Bayliss, Chris (Chicago); VTK Users
Subject: Re: [vtkusers] Replacing Points in polydata mesh

 

	This isn't done very often in VTK since filters aren't allowed
to modify their inputs.  That being said, you could do something like
the following if you wanted to change the coordinate location of a
point:
	vtkPoints* points = poly->GetPoints();
	points->SetPoint();

 

Make sure to mark points modified (after you change bunch of them) by
points->Modified(); 

 

HTH,

Aashish

 

	
	If you wanted to change your grid topology you'll have to get
depper and modify the appropriate vtkCellArray of the polydata.
	
	Hope this helps,
	Andy

	On Thu, Apr 12, 2012 at 12:03 PM, Bayliss, Chris (Chicago)
<cbayliss at gnresound.com> wrote:

		Hello Users,

		 

		I am looking for a way to replace points in vtkPolyData.
I already have a polydata surface and I would like to drag the points on
that surface to new locations while maintaining the existing surface.
If I create a new set of polydata points, I would have to reconstruct
the surface, which I am having trouble with.  Vtksurfacereconstruction
filter does not produce a representative surface and I cannot get
vtkpowercrustsurfacereconstruction filter to work.

		 

		I can't seem to figure out which functions in
vtkPolyData would produce the desired result.  Any advice would be
greatly appreciated.  Any ideas on how to get
vtkpowercrustrsurfacereconstruction filter to work would also be very
helpful.

		 

		Thanks,

		 

		Chris

		 

		 

		 

		 

		 

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-- 
| Aashish Chaudhary 
| R&D Engineer         
| Kitware Inc.            
| www.kitware.com    

 

 

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