[vtk-developers] Performance slow down

[Jeff Baumes]

I've seen this issue before where textures were being reloaded every
frame because someone had added a

|| this->Renderer->MTime() > blah

to the if statement for reloading the texture, and the renderer was
actually being modified every frame. It looks like in this case it is
really just a specific part of the vtkActor that Francios is checking
for modification. Something in the actor is changing in your program
every frame, but not the part of the actor that should really make
that "if" pass. The condition should probably be more restrictive and
only pass if certain parts of the actor are modified.

Jeff


On Thu, Jul 24, 2008 at 12:22 PM, Mathieu Coursolle
<mcoursolle at rogue-research.com> wrote:
> Hi,
>
> I've track down the source of the problem to this change:
>
> http://public.kitware.com/cgi-bin/viewcvs.cgi/Rendering/vtkOpenGLDisplayListPainter.cxx?r1=1.7&r2=1.8
>
> For some reason, if I undo this single change, it is rendering as fast as
> before.
>
> Anybody knows what the problem might be?
>
> Thanks!
>
> Mathieu
>
>
>
> On 24-Jul-08, at 11:07 AM, Mathieu Coursolle wrote:
>
>> Hi vtk-dev,
>>
>> I am developing a Cocoa application on Mac OSX 10.5 based on VTK.
>> I usually update from CVS once in a while to have the recent fixes
>> and features.
>>
>> I updated yesterday and rendering a vtkPolyData is now very slow.
>> It use to be quite fast with my 2 weeks old version.
>>
>> I used the Shark tool to check in which part of the code it was spending
>> all
>> this time, and it resulted in the OpenGL API.
>>
>> Any idea of which last days commit might have cause this?
>>
>> Thanks!
>>
>> Mathieu
>> _______________________________________________
>> vtk-developers mailing list
>> vtk-developers at vtk.org
>> http://www.vtk.org/mailman/listinfo/vtk-developers
>>
>
> _______________________________________________
> vtk-developers mailing list
> vtk-developers at vtk.org
> http://www.vtk.org/mailman/listinfo/vtk-developers
>



-- 
Jeff Baumes, Ph.D.
R&D Engineer, Kitware Inc.
(518) 371-3971 x132
jeff.baumes at kitware.com