vtkContourFilter

[Dr. Jasjit Suri]

Bill Lorensen wrote:

> Folk,
>         If you use vtk to extract isosurfaces AND build with the patented kit, read
> on.... otherwise you can ignore this message.
>
> As you know, since the beginning of time (that is vtk time),
> vtkContourFilter used vtkMarchingCubes (or Squares) if  1) you built your
> vtk with patents and 2) your data was structured points. This has caused all
> of us difficulties in the build process and, for some, has caused confusion
> about what algorithm is being used.
>
> To remedy the above, we have removed the patent dependencies from
> vtkContourFilter. The filter will now always use the "cell at a time"
> approach, regardless of the data set topology.
>
> A new filter, vtkMarchingContourFilter, in the patented kit, acts like
> the old vtkContourFilter. It uses the Marching classes if the data is
> structured and vtkContourFilter (a cell at a time) if it's not.
>
> vtkContourFilter is about 1/2 the speed of vtkMarchingContourFilter for
> structured data. So if you see a performance degradation in your app, change
> vtkContourFilter to vtkMarchingContourFilter.
>
> Bill
>
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This is good news but this means, this change is only in the nightly release (going to
be VTK 3.0), right !!!
so, we have to down load every thing and recompile ....

Have a nice weekend..

jss



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