[vtkusers] OffScreenRendering and GetMemoryDC

[Jean-Baptiste Estival]

Hi all,

I have some problem to make work VTK under another non-rectangular 
dialog with transparency.
My idea is to use offscreen rendering for VTK part, and use simple 
BitBlt and GetMemoryDC to deal with the transparency.
But, BitBlt always draw a blank screen.

On WM_PAINT message, I do :
StretchBlt(    dc.GetSafeHdc(), 0, 0, 1280, 1024,
                    m_pRenderWindow->GetMemoryDC(), 0,0, 1280, 1024,  
SRCCOPY);   

When I want to render :
m_pRenderWindow->Render();
RedrawWindow(NULL, NULL, RDW_INVALIDATE|RDW_UPDATENOW);


Any idea ?

thanks a lot

best regards,
JB