[vtkusers] Clear / update function for vtkImageMapToRGBA

[Roelof Kemp]

Hi David,

Thank you for your reaction. It worked out fine!

Roelof

David Gobbi schreef:
> Hi Roelof,
>
> The VTK pipeline executive is supposed to re-execute vtkImageMapToRGBA 
> in this situation.  The reason that it isn't re-executing is most 
> likely that when you change the data (i.e. at each time step), the VTK 
> executive doesn't notice that you made the change.
>
> If you call the Modified() method on vtkImageMapToRGBA every time 
> step, that will ensure that it will re-execute the next time you 
> render the image.
>
>  - David
>
>
> On 2/8/07, *rkemp* <rkemp at few.vu.nl <mailto:rkemp at few.vu.nl>> wrote:
>
>     Hi,
>
>     I've a little program which visualizes a calculation each time
>     step. I use the ImageViewer object to
>     display it.
>
>     I) If I render the ImageData directly the visualization behaves
>     just as expected (grayscale)
>
>     II) However if I render it using with a vtkImageMapToRGBA filter
>     in order to get a colored
>     visualization, only the first rendering appears. New renderings
>     don't appear, because the first one
>     is still there. If I only render the last rendering, it is exactly
>     the colored visualization I expect.
>
>     My question: Do you have to use some clear operation or something
>     in situation II? Which function
>     should do that??
>
>     Thank you very much for your comments!!
>
>     Roelof
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