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

[Tracy Hu]

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;
}




      
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.vtk.org/pipermail/vtkusers/attachments/20090220/bc63e112/attachment.htm>