[vtkusers] Re: What's Wrong With This?!?

[Goodwin Lawlor]

Hi Andrea,

Just some things to try...

1. Call SetNumberOfComponents() before SetNumberOfTuples()
2. Take vtkExtractGrid out of the pipeline
3. Try using vtkPoints::Allocate() and vtkPoints::SetTuple3() in a loop 
instead of vtkPoints::SetData()- just to see if the problems is there.
4. All your point coords are zero- try laying them in a simple grid.

hth

Goodwin



Andrea Gavana wrote:
> Hello Charl & NG,
>  
>     thank you very much for your answer. Well, the scalar range doesn't 
> mean a lot since the grid has all coordinates equal to zero. You can 
> easily remove it and VTK will still crash. I have tried the script also 
> with my real grid data (60,000 cells) and it crashes anyway.
> This is somewhat strange because it worked with VTK 4.4/4.5 CVS the last 
> time I used it (almost 1 year ago) and wxPython 2.6.1.0 <http://2.6.1.0>.
> Now I am going to try VTK 4.4 from the website and see if it works. If 
> it doesn't work, I will try to downgrade wxPython to 2.6.1.0 
> <http://2.6.1.0>. If this one doesn't work, I don't know what to do. It 
> looks like a bug somewhere.
> Now, a couple of questions:
>  
> 1) Which are the disadvantages of downgrading VTK to 4.4 wrt 5.0? Is 5.0 
> faster in visualization or has it some magic that 4.4 misses?
> 2) I have downloaded from the website, together with the zipped source 
> file, also the Windows binary installer: once I run it, I get some tcl 
> files and a 15 MB vtk.exe file, and nothing more. What this executable 
> is supposed to do? In which way I can use it? It seems to me that it 
> does nothing but a black TK window, that is not very useful...
>  
> Thank you very much for your help and suggestions.
>  
> Andrea.
> 
> 
> On 3/21/06, *Charl P. Botha* <cpbotha at cpbotha.net 
> <mailto:cpbotha at cpbotha.net>> wrote:
> 
>     Hi there Andrea,
> 
>     On 3/21/06, Andrea Gavana <andrea.gavana at gmail.com
>     <mailto:andrea.gavana at gmail.com>> wrote:
>      >     thanks a lot for your answer. Yes, the black window should be
>     correct as
>      > I just put dummy data on the grid (everything is zero). I was
>     expecting the
>      > same result, but I am not even able to get that black window. VTK
>     crashes
>      > with a Windows error message popup before that black window
>     appears... I
>      > don't know where the cause of the problem is.
> 
>     I've ran your code and can reproduce what you see on Windows and
>     Linux.  I've had a longer look at it, but I haven't been able to find
>     the problem.
> 
>     One thing that does bother me (but maybe I'm simply missing something)
>     is the scalar range of (0.0, 1.875).  Where is that coming from?
> 
> 
> 
> 
> -- 
> "Imagination Is The Only Weapon In The War Against Reality."
> 
> http://xoomer.virgilio.it/infinity77/
> 
> 
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