Thanks very much for the answer. I am now trying the hardware driver for mesa, the drm. Do you think it would help ?

Brian Paul <brian.paul@tungstengraphics.com> wrote:
tran huy hoang wrote:
> hi,
> I've done successfully with an older version : 6.4.2. But there is
> something I don't understand: is OffScreenRendering with Mesa faster
> than OnScreenRendering? I've test with a simple vtk program that rotate
> a cone 1000 times while rendering the window, and it turned out that
> rendering on screen is much faster than Offscreen(I used vtkRenderWindow
> VS vtkXMesaRenderWindow and so on...)

I think Vtk might be using "mgl" Mesa for off-screen rendering and the
native OpenGL library for on-screen rendering. If the native OpenGL
library is using hardware, it'll certainly be faster.


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