[vtkusers] creating a texture costs extra 30MB memory,

[Tracy Hu]

thanks a lot for help. But is there anyway at all 
to use the same picture for texture, but reduce the memory cost? perhaps at the 
cost of slower rendering?
 
thanks

tracy



Assuming your image is one component and a component takes one byte:
11083x823/1024/1024=8.7MB.
If you have three components (RGB), this is 26.1MB (close to 30MB).

So, I guess your 1015KB is actually the size of the compressed jpg file...


On Fri, Feb 20, 2009 at 3:16 PM, Tracy Hu <tracy.hu at yahoo.com> wrote:
> I wrote simple code as following to decide how much memory a vtkTexture
> would result.
> without using texture (by commenting out the line
> "actor->SetTexture(pTexture)" ), the process takes 74MB memory,
> using texture(by uncommenting the line "actor->SetTexture(pTexture)" ), the
> process takes 105MB memory.
> the dimension of picture FOREST011.jpg is 11083 X 823, and takes 1,015KB
>
> Can somebody give me any idea what's going on, or how to avoid this memory
> expense?
>
> thanks a lot
> Tracy
>
> int main_vtk(int argc, char* argv[])
> {
>     vtkJPEGReader* pJPEGReader = vtkJPEGReader::New();
>         pJPEGReader->SetFileName("D:\\FOREST011.jpg");
>         pJPEGReader->ReleaseDataFlagOn();
>     vtkTexture* pTexture = vtkTexture::New();
>         pTexture->SetInputConnection(pJPEGReader->GetOutputPort());
>         pTexture->InterpolateOn();
>         pTexture->ReleaseDataFlagOn();
>     pJPEGReader->Delete();
>
>     vtkSphereSource *sphere = vtkSphereSource::New();
>     vtkPolyDataMapper *mapper = vtkPolyDataMapper::New();
>         mapper->SetInputConnection(sphere->GetOutputPort());
>         mapper->ScalarVisibilityOff();
>     vtkActor *actor = vtkActor::New();
>         actor->SetMapper(mapper);
>         actor->GetProperty()->SetColor(0.0, 0.0, 1.0);
>         actor->SetTexture(pTexture);
>
>     vtkRenderer* ren = vtkRenderer::New();
>         ren->SetBackground(1, 1, 1);
>         ren->AddActor(actor);
>
>     vtkRenderWindow* renWin = vtkRenderWindow::New();
>         renWin->AddRenderer(ren);
>
>     vtkRenderWindowInteractor* iren = vtkRenderWindowInteractor::New();
>         iren->SetRenderWindow(renWin);
>     vtkInteractorStyleTrackballCamera *style =
> vtkInteractorStyleTrackballCamera::New();
>         iren->SetInteractorStyle(style);
>
>     renWin->SetSize(600,600);
>     renWin->SetPosition(600, 100);
>     renWin->Render();
>
>     iren->Initialize();
>     iren->Start();
>
>     return 0;
> }
>
>
>
> _______________________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at
> http://www.kitware.com/opensource/opensource.html
>
> Please keep messages on-topic and check the VTK FAQ at:
> http://www.vtk.org/Wiki/VTK_FAQ
>
> Follow this link to subscribe/unsubscribe:
> http://www.vtk.org/mailman/listinfo/vtkusers
>
>



-- 
François Bertel, PhD  | Kitware Inc. Suite 204
1 (518) 371 3971 x113 | 28 Corporate Drive
                      | Clifton Park NY 12065, USA



    



      
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.vtk.org/pipermail/vtkusers/attachments/20090220/a0537ba6/attachment.htm>