[vtkusers] Using vtkContourFilter for Rendering a Point Cloud

[Moritz Bernard Fricke]

Cory,
i have still problems concernig the scalar warping in vtkGaussianSplatter. I can't use the ParticleReader because the files i'm using contain more information in a line. But the extraction from the file is already working, i have writting a parser doing that.

But if scalar warping is on, where does the filter get the scalars from? I have a list of floats that contains the energies of the particle? How can i use thme as scalars for the splats?

Moritz 

----- Ursprüngliche Nachricht -----
Von: Cory Quammen <cquammen at cs.unc.edu>
Datum: Mittwoch, April 30, 2008 9:34 pm
Betreff: Re: [vtkusers] Using vtkContourFilter for Rendering a Point Cloud
An: Moritz Bernard Fricke <Moritz.Bernard.Fricke at rwth-aachen.de>, vtkusers at vtk.org

> I'm copying to the vtkusers list as a reference so that in the future
> others with the same question as you.
> 
> Take a look at vtkParticleReader. It looks like it does exactly what
> you want. It reads xyz coordinates and a scalar value.
> 
> Cory
> 
> On Wed, Apr 30, 2008 at 11:30 AM, Moritz Bernard Fricke
> <Moritz.Bernard.Fricke at rwth-aachen.de> wrote:
> > Cory,
> >  how can associate these scalar values in vtk? I think that is my 
> major problem.
> >  So, I get the data for each point from a log-file from a ray 
> tracing simulation for acoustics. Can I use vtkFloatArray to create 
> an array of energies? And how can I associate these energies to the 
> Points in my UnstructuredGrid?
> >  Thank you for your help, i'm running out of time with this project!
> >
> >  Moritz
> >
> >  ----- Ursprüngliche Nachricht -----
> >  Von: Cory Quammen <cquammen at cs.unc.edu>
> >  Datum: Mittwoch, April 30, 2008 4:59 pm
> >  Betreff: Re: Using vtkContourFilter for Rendering a Point Cloud
> >  An: moritz.bernard.fricke at rwth-aachen.de, vtkusers at vtk.org
> >
> >
> >
> >  > Moritz,
> >  >
> >  > If your unstructured grid has associated scalar data (in your 
> case,>  > the energy of the points), then according to the 
> documentation>  > 
> (http://www.vtk.org/doc/nightly/html/classvtkGaussianSplatter.html),>  > you can tell the vtkGaussianSplatter to scale the values of the
> >  > splatted Gaussian by the scalar value using ScalarWarpingOn().
> >  >
> >  > Cory
> >  >
> >  > On Wed, Apr 30, 2008 at 10:04 AM,  <moritz.bernard.fricke at rwth-
> >  > aachen.de> wrote:
> >  > > Hi Cory,
> >  > >  thank you for your answer. i've tried it! I have just build an
> >  > Structured Grid of my Points and applied vtkGaussianSplatter 
> at it.
> >  > That works, but i want to interpolate the values of the 
> points. How
> >  > can I link the energy of one point to its position to make the
> >  > energy the criteria for the GaussianSplatter?
> >  > >
> >  > >  Thank you for your help,
> >  > >
> >  > >  moritz
> >  > >
> >  >
> >  >
> >  >
> >  > --
> >  > Cory Quammen
> >  > Department of Computer Science
> >  > University of North Carolina at Chapel Hill
> >  > http://www.cs.unc.edu/~cquammen
> >  >
> >
> 
> 
> 
> -- 
> Cory Quammen
> Department of Computer Science
> University of North Carolina at Chapel Hill
> http://www.cs.unc.edu/~cquammen
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