[Octaviz-help] Re: pcolor function

[Fabian B. <f.b...@gm...>]

Hi Jonathan,

* On 30 Nov 2005 * Jonathan Stickel wrote:

> Fabian
> 
> I am not really sure what you are asking, perhaps because I do not know 
> what 'tecplot' is or what its data is for.  The octaviz functions 
> (vtk_something) are attempts to mimic high-level plotting commands that 
> are available in Matlab.  Is there something in Matlab that you like 
> that isn't yet in Octaviz?  Please point that out, and we can try to 
> implement it.

Sorry, I was not clear enough; I try it better:

I have some 3D data (coordinates and velocities) from a CFD simulation (actually in
tecplot format, but since vtk does not have any reader for
tecplot, the format is not important). I load these datas
using 'load' in octave. Now, I would like to display the
velocity field at a certain plane. Using original vtk
commands and a vtk reader I would use the vtkCutter, e.g.:

  cutter = vtkCutter();
  cutter.SetInput(reader.GetOutput());

In matlab I used the function 'pcolor', which does about the
same as the 'cutter'.

As mentioned there exists no reader for my formated data, so
I was asking, if it somehow possible to use the 'loaded'
data aus input for the vtkCutter, e.g.:

  load data;
  
  x=data(:,1);
  y=data(:,2);
  z=data(:,3);
  u=data(:,4);
  
  cutter= vtkCutter();
  cutter.SetInput(x,y,z,u);

Using the pcolor function in matlab I had to 'reshape' the
velocity: 

  U=reshape(u,size(x),size(y));
  pcolor(x,y,U)

Maybe, you have an idea how to do that!?
Probably the best way would be to convert those tecplot data
into the ensight format ... unfortunately I was not able to
do that yet :-(


Greetings!
Fabian


> 
> Octaviz does allow you to use VTK objects and manipulate them.  The 
> ClipCow.m example uses vtkCutter, so you can look at that if that is 
> what you want.
> 
> Jonathan
> 
> 
> Fabian Braennstroem wrote:
> >Hi,
> >
> >I'm still using it :-)
> >
> >Right now, I have some trouble to display some 'tecplot'
> >formated data using octaviz. One problem is, that their
> >exist no reader in vtk for it. To get around that I would
> >load the data into octave and display the data using pcolor,
> >but that just would work in Matlab nicely. 
> >
> >Anyways, to get all simulation results in the same vtk-style
> >I am looking for a vtk-function, which replaces 'pcolor'. In
> >my point of view, the vtkCutter is the right modul, but I
> >don't know, how I can get my data into it!? There does not
> >exist a 'vtk_cutter' function similar to pcolor in octaviz,
> >doesn't it? 
> >

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