[vtkusers] OffScreenRendering and GetMemoryDC

[Jean-Baptiste Estival]

OK, it works but offscreen rendering is very slow ...
My VTK scene is composed by a single STL object.
Without  : m_pRenderWindows->Render();   the refresh rate is about 110Hz
Without : StretchBlt but with Render(), the refresh rate is about 14Hz 
.... !!!

I don't know a parameter exists.

Thanks again for your help

regards.

JB


Jean-Baptiste Estival a écrit :
> 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
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