[vtkusers] vtkClipPolyData with vtkBox doesn't work

[Eric E. Monson]

Hello Adeline,

(Please reply to the whole list so others can help if they have ideas, too.)

Okay, if setting the bounds manually doesn't work, maybe you can post a more complete code sample and someone will be able to play with it or spot the problem.

Good luck,
-Eric


On Jan 15, 2010, at 5:00 AM, Adeline Joliet wrote:

> Hello Eric,
> 
> Thank's for the answer.
> 
> "So, are you seeing nothing when you render your scene?"
> Actually no, nothing appends my Polydata is not "cuted" it's exactly the same size
> 
> Then I tried InsideOutOn() and now nothing is dislplayed.
> 
> I don't know where I can be wrong.. I will try again to set the bounds manually, but not sure that's the problem..
> 
> Regards,
> Adeline
> Subject: Re: [vtkusers] vtkClipPolyData with vtkBox doesn't work
> From: emonson at cs.duke.edu
> Date: Thu, 14 Jan 2010 14:28:52 -0500
> CC: vtkusers at vtk.org
> To: adeline_joli at hotmail.com
> 
> Hello Adeline,
> 
> So, are you seeing nothing when you render your scene? One thing to be careful of when using a box for your clip function is which direction the default normals of the box faces point -- this defines whether the clip leaves the inside intact or cuts out the inside of the box. Maybe this isn't the problem you're having, but you could try setting 
> 
> clipper->InsideOutOn();
> 
> and see if anything shows up.
> 
> Otherwise, there are examples of clipping with the vtkBoxWidget and it's GetPlanes method in {vtksource}/Widgets/Testing/Cxx/BoxWidget.cxx and {vtksource}/Examples/GUI/Python/BoxWidget.py in case those could help you track down the problem or approach it in another way. 
> 
> Talk to you later,
> -Eric
> 
> ------------------------------------------------------
> Eric E Monson
> Duke Visualization Technology Group
> 
> 
> On Jan 14, 2010, at 12:29 PM, Adeline Joliet wrote:
> 
> Hello,
> 
> I'm trying to cut un polydata using vtkClipPolyData with a vtkBox as implicit function.
> 
> my Polydata is simply a rectangle (x = 100, y = 50, z= 20). I'd like to cut this rectangle to obtain
> only the part of the middle.. (so i'd like to cut to a right side AND a left side...)
> 
> here is the code
> 
>  vtkBox * cuting = vtkBox::New();
>   double boundy[6];
> 
>   //m_image is a vtkImageData that represent a cube (my rectangle polydata interect this cube, so the bounds should be correct...)
>   m_image->GetBounds(boundy);
> 
>   cuting->SetBounds(boundy);
>  
> vtkClipPolyData * clipper = vtkClipPolyData::New();
> clipper->SetInput(newPolyData);
> clipper->SetClipFunction(cuting);
> 
> // and then I display clipper->GetOutput...
> 
> the thing is that i tried with vtkPlane and it works... but the problem is that i need if a use
> vtkPlane I can cut only One side....
> 
> 
> any help would be appreciated,
> Than's
> 
> Adeline
> 
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