[vtkusers] Speed/vtkImageData

[David Gobbi]

Hi Ted,

Make sure the whole of the ImageData has been updated.  I suspect
that the reason things are slow is that it is continuously re-reading
the data from disk, either that or it is continuously re-executing
upstream portions of the pipeline.

To update the whole ImageData:
ImageData->UpdateInformation();
ImageData->SetUpdateExtent(ImageData->GetWholeExtent());
ImageData->Update();

If this is the first time that the ImageData has been updated,
you can just do ImageData->Update() and skip the rest.

Also, since ImageActor renders the image via texture maps, make sure
that you have a good 3D graphics card in your computer.

 - David


On Thu, 1 Apr 2004, Ted Vu wrote:

> Hi
> Is there any way I can speed up rendering of 2D vtkImageData?
>
> My pipeline is
>
> ImageData -> ImageMapToColors -> ImageActor
>
> I have 3 of these ImageData's which appear on one Renderer
>
> Can I somehow use LODActor do you think?
>
> Thanks!
>
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