performance issues with vtkStructuredGrid and vtkExtractGrid

[Bill Lorensen]

Jody,
         What version of vtk are you using. I recall that we fixed a pipeline problem with one of those filters.

Bill

At 08:34 AM 5/25/00 -0500, Jody Winston wrote:
>I am having huge performance decrease of 10 to 20 times when I use
>vtkExtractGrid to extract a subset of the VOI in a vtkStructuredGrid.
>The basic program flow to create the grid, find the extents, extract
>the extents and then display the data:
>
>     reader = vtkStructuredGridReader()
>     reader.SetFileName("Medium.bin")
>     reader.Update()
>
>     inputExtents = reader.GetOutput().GetExtent()
>     extents = [inputExtents[0], inputExtents[1],
>                inputExtents[2], inputExtents[3], 
>                0, 64]
>
>     grid = vtkExtractGrid()
>     grid.SetInput(sgrid)
>     grid.SetVOI(extents[0], extents[1],
>                 extents[2], extents[3],
>                 extents[4], extents[5])
>
>The previous fragment runs 10 to 20 times slower than the following
>modification:
>     extents = [inputExtents[0], inputExtents[1],
>                inputExtents[2], inputExtents[3], 
>                inputExtents[4], inputExtents[5]]
>
>I have a full program with timing information and data if anyone wants 
>to take a look at it.
>
>Jody


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