[vtk-developers] A new way to look at images

[Will Schroeder]

Hi David-

I see what you are saying and it makes sense, I am wondering what would
be the names of the various image mappers  (since you indicate that there is
more than one)?

W

On Sat, Jan 22, 2011 at 10:33 AM, David Gobbi <david.gobbi at gmail.com> wrote:

> Hi Will,
>
> I did think of ImageSliceActor and several other names, but the issue
> is the "reslicing" is done by the mapper class, not by the actor
> class.  So right now I have my vtkImage class paired with a mapper
> that displays images by reslicing them.  By I also intend to write
> another mapper for viewing 2D images.
>
> The idea here is that the three major Prop3D types will be vtkActor,
> vtkVolume and vtkImage.
>
> The vtkImage class would be the definitive image-viewing class for
> VTK.  It would have:
> 1) a mapper that reslices the image and displays the slice
> 2) a mapper that does what vtkImageActor does
> 3) a mapper for doing slice display of vtkUnstructuredGrid data
> 4) down the line, perhaps some GPU-specialized mappers
>
> What I'm trying to say here is that the reslicing behaviour that I
> described in my previous email is all in the mapper.  The vtkImage
> "actor" class, on the other hand, is meant to be very generic.  It is
> just a Prop3D that image-related mappers can be attached to.
>
>  David
>
>
> On Sat, Jan 22, 2011 at 7:32 AM, Will Schroeder
> <will.schroeder at kitware.com> wrote:
> > David this is very clever and seems pretty intuitive to use (I did not
> > actually try it).
> > I think my initial (minor) concern is naming, while I think what you've
> come
> > up is pretty good I can see how a novice might get confused.  Did you
> > consider something like "ImageResliceActor", "ResliceActor" or simply
> > "Reslice"?
> > W
> >
> >
> > On Fri, Jan 21, 2011 at 6:53 PM, David Gobbi <david.gobbi at gmail.com>
> wrote:
> >>
> >> Hi All,
> >>
> >> I've been experimenting with a new way of rendering 3D images in VTK.
> >> So far, it is working fairly well.  Here is a rough description of the
> >> new VTK classes I've written:
> >>
> >> vtkImage - a new prop for image viewing, analogous to vtkVolume and
> >> vtkActor
> >> vtkImageProperty - holds the lookup table, window/level, etc.
> >> vtkImageMapper3D - a new mapper that does image reslicing and texturing
> >>
> >> Using these classes is very simple: just set up the camera, and the
> >> vtkImage object will automatically display the slice at the camera
> >> focal point.  To show a different slice, just move the focal point so
> >> that it lies at a different position in the 3D image.  To slice in a
> >> different orientation, rotate the camera around the focal point.  In
> >> other words, the slicing is completely controlled by the camera.  This
> >> makes everything work nicely with the VTK interactors, and also
> >> simplifies the intermixing of images and geometry.
> >>
> >> My reason for making this class is that I've seen plenty of users on
> >> the list who struggle with vtkImageReslice and with vtkImageViewer.  I
> >> wanted to make it as easy to view an image in VTK as it is to view an
> >> actor. I have the code on my github account
> >> git://github.com/dgobbi/VTK.git in the branch "image-prop"
> >> http://github.com/dgobbi/VTK/tree/image-prop
> >>
> >> The code includes a modified vtkInteractorStyleImage class that has
> >> new interactions for rotating the camera with shift-leftbutton (for
> >> oblique slicing) and for adjusting the focal point with
> >> shift-middlebutton (for slicing through the image).  There is also a
> >> python example in Examples/ImageProcessing/Python/ImageMapper3D.py.
> >> All of this is still preliminary development, but so far I haven't
> >> encountered any show-stopping bugs.
> >>
> >> Please let me know what you think.  I'll try to make a wiki page with
> >> more details next week.
> >>
> >>  - 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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