[vtk-developers] Permission to replace vtkCellLocator with an improved version

[Will Schroeder]

To ask an obvious question, when the replacement is made, do all the tests
pass? Particularly the widget tests?


On Tue, Jan 19, 2010 at 1:47 PM, David Gobbi <david.gobbi at gmail.com> wrote:

> Yes, that's pretty much it.  I mean to rename vtkSurfacePicker to
> vtkCellPicker, overwriting the existing vtkCellPicker and replacing
> it.
>
>   David
>
>
> On Tue, Jan 19, 2010 at 11:04 AM, Will Schroeder
> <will.schroeder at kitware.com> wrote:
> > David, just to make sure, please elaborate on "replace vtkCellPicker with
> > vtkSurfacePicker". I think you mean you'll replace the guts of
> vtkCellPicker
> > with your vtkSurfacePicker functionality... is this correct?
> >
> > On Tue, Jan 19, 2010 at 12:21 PM, David Gobbi <david.gobbi at gmail.com>
> wrote:
> >>
> >> HI All,
> >>
> >> Around seven weeks ago I added a new class to VTK called
> >> vtkVolumePicker  (http://www.vtk.org/Wiki/VTK/Volume_Picking) that
> >> improved volume picking.  This class also included several
> >> improvements for polydata picking that I needed for my applications,
> >> including the ability to use a vtkCellLocator to speed up the pick.
> >>
> >> Soon after adding this class to VTK, I split off a subclass called
> >> vtkSurfacePicker
> >> (http://www.vtk.org/doc/nightly/html/classvtkSurfacePicker.html) that
> >> has 95% of the functionality of vtkVolumePicker, but doesn't depend on
> >> the VolumeRendering kit.  This vtkSurfacePicker is, essentially, an
> >> improved vtkCellPicker.  Compared to vtkCellPicker, here is a summary
> >> of the most important improvements:
> >>
> >> - the ability to add a vtkCellLocator to accelerate the picking of
> >> large data sets (it's rather shocking that vtkCellPicker cannot do
> >> this)
> >>
> >> - much faster algorithms for picking volumes and images.. the
> >> vtkCellPicker does a tedious search through all the cells in the
> >> vtkImageData, but this new picker simply intersects the view ray with
> >> the image data
> >>
> >> - specifying an "opacity isovalue" value for more useful volume
> >> picking, i.e. it doesn't pick transparent regions, instead it picks
> >> the visible volume surface
> >>
> >> - several methods for getting more information about what was picked,
> >> including IJK coords for images, volumes, and textures
> >>
> >> - it acknowledges the existence of mapper clipping planes... the
> >> vtkCellPicker ignores clipping planes so it will pick regions that
> >> have been clipped away
> >>
> >> I would like to replace the vtkCellPicker with this new
> >> vtkSurfacePicker class.  Since it provides a superset of vtkCellPicker
> >> functionality and improved performance, the change should be
> >> transparent to all users.  The only problem might be conflicts between
> >> the new methods and third-party subclasses of vtkCellPicker.
> >>
> >> Any thoughts?  Should I have sent this email to the ARB list instead?
> >>
> >>   David
> >> _______________________________________________
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> >
> >
> >
> > --
> > William J. Schroeder, PhD
> > Kitware, Inc.
> > 28 Corporate Drive
> > Clifton Park, NY 12065
> > will.schroeder at kitware.com
> > http://www.kitware.com
> > (518) 881-4902
> >
>



-- 
William J. Schroeder, PhD
Kitware, Inc.
28 Corporate Drive
Clifton Park, NY 12065
will.schroeder at kitware.com
http://www.kitware.com
(518) 881-4902
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