[vtkusers] Offscreen rendering question

[Andreas Brüning]

Hello,

i checked out a nightly version of VTK and integrated it to my project. The performance is much better than before but still it is not the same than in OnScreen mode. I can see it specially when i render polygonal data. The gap between onscreen and offscreen performance increases when the the number of polygons gets higher. Are there any other ways to optimize the offscreen mode? 

Greetings 
Andi



>No, you won't need Mangled Mesa if you upgrade your version of VTK.
>Because 5.0.4 is the latest binary release, your best bet is to
>compile the source from CVS. Hardware acceleration should work fine
>with your card.

>Cory

>On Tue, Jul 22, 2008 at 12:43 PM, Andreas Brüning <mail-andi at web.de> wrote:
>>
>> Thanks for your quick answer. I also heard about that.  I am using version 5.0.4. Do i need a newer version? I have a NVIDIA Quadro FX550, so i think it should >>work with it.
>> I also read something about offscreen rendering and mesa. Do i have to enable Mangled Mesa in CMake when i want to develope offscreen or it not necessary?
>>
>> Andi
>>
>>
>> What version of VTK are you using? Older versions used software
>> rendering to do offscreen rendering, which explains the performance
>> hit you are seeing. The version in CVS supports offscreen rendering in
>> hardware, assuming your hardware supports it, so you shouldn't see a
>> performance decrease.
>>
>> Cory
>>
>>>On Tue, Jul 22, 2008 at 9:37 AM, Andreas Brüning <mail-andi at web.de> wrote:
>>> Hello,
>>>
>>> i am using VTK to develope different algorithms on Windows and C++. Until now i always visualize the results on a vtkOpenGlWin32RenderWindow. Now i have to >>>implement an offscreen renderer. But as soon as i call OffScreenRenderingOn() in vtkOpenGlWin32RenderWindow the Render()- method needs more than ten times >>>longer than in OnScreenRendering mode.
>>>
>>> Is there a way to increase the performance while using the offscreen mode or is there another way to develope an offscreen renderer?
>>>
>>> Thanks in advance
>>> Andi





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