[vtkusers] vtkGPUVolumeRayCastMapper: Updateing ImageData after first Rendering?

[Sankhesh Jhaveri]

Hi Willy,

You need to call Modified() on the vtkImageData, each time you update it,
for the volume mapper to reload the volume.

Hope that helps.

Sankhesh
​

On Mon, Feb 13, 2017 at 8:42 AM Willy <Wiggerl at linhuber.info> wrote:

> Thanks for your reply, but i think i described my problem not detailed
> enough.
>
> I don't use vtkRenderWindowInteractor. I have a .NET project with .Net
> PictureBox in it and a C++ Project witch encapsulates all the vtk stuff. To
> show the rendered vtk image in my picturebox i set my vtkRenderWindow to
> OffScreenRenderingOn() and use the following method to Convert vtkImageData
> to a .NET Bitmap:
>
> void VolumeRenderer::Render3DImage(int width, int height, Bitmap^% image)
> {
>     _RenderWindow->SetSize(width, height);
>     _CurrentRenderer->ResetCameraClippingRange();
>     vtkRenderLargeImage* imageFilter = vtkRenderLargeImage::New();
>     imageFilter->SetInput(_CurrentRenderer);
>     imageFilter->SetMagnification(1);
>     imageFilter->Update();
>     ConvertRGBVTKImageToBitmap(imageFilter->GetOutput(), image);
>     imageFilter->Delete();
> }
>
> Each time the user moves the mouse, changes the color, ... i change the
> Position/Rotation of the camera or the vtkColorTransferFunction or
> wathever.
> And after that i recall Render3DImage to get the new Picture which i show
> in
> my PictureBox. After the very first call of Render3DImage the rendered
> image
> does not change anymore if i change the data in my vtkImageData (using
> memcpy). i guess that the very first call of Render3DImage copies my
> cpu-Memory (where vtkImageData is) to the gpu. If a change the vtkImageData
> after that it does not affect the gpu-memory.
> Am i rigth? what can i do?
>
>
>
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-- 
Sankhesh Jhaveri *Sr. Research & Development Engineer* | Kitware
<http://www.kitware.com/> | (518) 881-4417
​
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