[Paraview-developers] sorting

[Wylie, Brian]

Not to make too fine a point, but just to be clear...

In my experience you cannot have a filter do polygonal sorting and
expect interactive frame rates. The sorting needs to be in the mapper to
have any hope of actually being useful.

	Brian Wylie
	Sandia National Laboratories
	MS 0822 - Org 9227 - Building 880/A1-J
      (505) 844-2238   FAX (505) 845-0833
 

> -----Original Message-----
> From: vtk-developers-bounces at vtk.org 
> [mailto:vtk-developers-bounces at vtk.org] On Behalf Of Moreland, Kenneth
> Sent: Tuesday, December 21, 2004 2:16 PM
> To: Ken Martin; Brad King
> Cc: VTK Developers; ParaView Developers
> Subject: RE: [Paraview-developers] Re: [vtk-developers] A PT 
> mapper for VTK
> 
> > > 
> > > I assume you mean vtkDepthSortPolyData.  Yes, I originally
> > looked into
> > > using that, but quickly ruled it out.    vtkVisiblitySort and its
> > > subclasses need to resort on a per-frame basis.  
> > 
> > I believe DepthSortPolyData also does this on a per frame 
> basis. Am I 
> > confused? (about this specific issue, not in general)
> 
> Sure.  vtkDepthSortPolyData will recompute its output every 
> time the camera changes, but it's really slow.
> 
> > > Yes.  vtkDepthSortPolyData can use a vtkVisibilitySort to
> > get a sorted
> > > list of cell ids, then build its output based on that.
> > 
> > Can you please make this change?
> 
> I can after the classes get moved into VTK.
> 
> > Let's call it vtkSortDataArray
> 
> OK.
> 
> -Ken
> 
>    ****      Kenneth Moreland
>     ***      Sandia National Laboratories
> ***********
> *** *** ***  email: kmorel at sandia.gov
> **  ***  **  phone: (505) 844-8919
>     ***      fax:   (505) 844-0833
> 
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