[vtkusers] vtkVolumeRayCastMapper under vtk 4.2

[Kenneth Gage]

Juan -

I would pull and compile the development version of VTK from CVS.  I
think the raycasting capabilities in this version (4.5) are much more
developed - I've been able to do unstructured grid raycasting with
that version.  I * think* this version might be able to let you do
what you want.  I haven't done structured grid raycasting with VTK so
I can't give too much advice about data conversion and what-not.

HTH -
Ken


On Mon, 06 Dec 2004 03:48:04 +0000, Juan Aja <juaja at hotmail.com> wrote:
> Sorry to bother again, but I guess my problem is more of design than
> anything else.
> It seems that VTK can only apply raycasting to objects of the type
> vtkImageData, so my problem is reduced to convert my vtkStructuredGrid to
> vtkImageData.
> I have read a lot of discussions on this list, and it seems that the
> direction I need to take is towards probing, via vtkShepardMethod,
> vtkProbingFilter or vtkGaussianSplatter.
> Unfortunately thoose posts didn't especify more, so I wanted to ask you how
> could I transform my grid into image data?
> 
> Again, thanks a lot.
> 
> >From: Kenneth Gage <kenneth.gage at gmail.com>
> >Reply-To: Kenneth Gage <kenneth.gage at gmail.com>
> >To: Juan Aja <juaja at hotmail.com>
> >CC: vtkusers at vtk.org
> >Subject: Re: [vtkusers] vtkVolumeRayCastMapper under vtk 4.2
> >Date: Sun, 5 Dec 2004 22:17:40 -0500
> 
> 
> >
> >Juan -
> >
> >I've had this problem a few times myself - take a look at the
> >following link in the VTK FAQ and see if this clears up the problem.
> >
> >http://www.vtk.org/Wiki/VTK_FAQ#Forward_declaration_in_VTK_4.x
> >
> >HTH -
> >Ken
> >
> > > When trying to compile it yields the following error message:
> "no matching
> > > function for call to
> > > `vtkVolumeRayCastMapper::SetInput(vtkStructuredPoints*)'
> > > /usr/local/include/vtk/vtkVolumeMapper.h:59: candidates are:
> virtual void
> > >   vtkVolumeMapper::SetInput(vtkImageData*)"
> > >
> > > I've double checked my code, and it's almost a carbon copy of the
> original
> > > written in tcl, so I suppose that in vtk 4.2.2 the function
> > > SetInput(vtkStructuredPoints*) in vtkVolumeRayCastMapper was
> dropped for
> > > SetInput(vtkImageData*).
> > >
> > > Is this correct?
> > > How can it be solved?
> > >
> > > I need to apply ray casting to a structured grid, so I used a
> structured
> > > grid reader, but now  I don't know how to use vtkVolumeRayCasting
> mapper on
> > > it.
> > >
> > > What shall I do?
> > >
> > > Cheers.
> > >
> > > Juan
> > >
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> >
> >--
> >Kenneth Gage
> >MD-PhD Student
> >McGowan Institute for Regenerative Medicine
> >University of Pittsburgh
> >Pittsburgh, PA 15203-2155
> 
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-- 
Kenneth Gage
MD-PhD Student
McGowan Institute for Regenerative Medicine
University of Pittsburgh
Pittsburgh, PA 15203-2155