[vtkusers] Fwd: Control VTK frame rate

[Cory Quammen]

Ken,

That's great info to know.

Thanks,
Cory

On Fri, Jul 7, 2017 at 8:48 AM, Ken Martin <ken.martin at kitware.com> wrote:
> On list in case it use useful to others
>
>
> ---------- Forwarded message ----------
> From: Ken Martin <ken.martin at kitware.com>
> Date: Fri, Jul 7, 2017 at 8:47 AM
> Subject: Re: [vtkusers] Control VTK frame rate
> To: Andreas Buykx <A.Buykx at dianafea.com>
>
>
> The default culler checks the bounding box of every actor/prop and if they
> are outside of the view frustum it does not render them. So the performance
> question becomes:
>
> is checking the actor's bounding box (with the pipeline mtime check) faster
> than the time savings of sometimes not rendering the actor?
>
> So when the actors will all typically be visible and there are lots of them
> (or their filter pipelines are long) removing the culler can save time
> because you may be CPU bound on checking pipeline mtime. Oddly enough
> checking pipeline mtime can be fairly time consuming for lots of
> pipelines/actors.  So making the mapper static and removing the culler
> basically cuts out all pipeline mtime checks reducing the CPU load which
> with a fast GPU the CPU can often be the bottleneck for lots of VTK actors.
>
>
>
> On Fri, Jul 7, 2017 at 5:07 AM, Andreas Buykx <A.Buykx at dianafea.com> wrote:
>>
>> Hi, could you please explain what the removal of the last culler is about?
>> In what situations is it needed? I looked in the VTK7.1.0 and found that a
>> small number of tests does this but  do not understand why it is needed in
>> these tests and not in others.
>>
>>
>>
>> Thanks a lot,
>>
>> Andreas Buykx
>>
>>
>>
>> From: vtkusers [mailto:vtkusers-bounces at vtk.org] On Behalf Of Ken Martin
>> Sent: Wednesday, July 05, 2017 2:30 PM
>> To: kay
>> Cc: vtk
>> Subject: Re: [vtkusers] Control VTK frame rate
>>
>>
>>
>> That doesn't seem to match the pseudo code you posted, where the transform
>> is applied to a filter (shared by all the actors, well the only actor).
>> Maybe an updated bit of pseudo code would help.
>>
>>
>>
>> In general with lots of actors you want to make sure
>>
>>
>>
>>         mapper->StaticOn();
>>
>>
>>
>> and
>>
>>
>>
>>     ren->RemoveCuller(ren->GetCullers()->GetLastItem());
>>
>>
>>
>> make sure it is a release build, and make sure your transformation is
>> happening on the actor, not a filter such as trransformpolydata.
>>
>>
>>
>>
>>
>>
>>
>> On Tue, Jul 4, 2017 at 5:18 PM, kay <jayavardhanravi at outlook.com> wrote:
>>
>> Transforms are independent and are applied directly to the actor
>>
>>
>>
>> --
>> View this message in context:
>> http://vtk.1045678.n5.nabble.com/Control-VTK-frame-rate-tp5743876p5743893.html
>> Sent from the VTK - Users mailing list archive at Nabble.com.
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>>
>>
>>
>> --
>>
>> Ken Martin PhD
>>
>> Distinguished Engineer
>> Kitware Inc.
>>
>> 28 Corporate Drive
>> Clifton Park NY 12065
>>
>>
>>
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>
>
>
>
> --
> Ken Martin PhD
> Distinguished Engineer
> Kitware Inc.
> 28 Corporate Drive
> Clifton Park NY 12065
>
> This communication, including all attachments, contains confidential and
> legally privileged information, and it is intended only for the use of the
> addressee.  Access to this email by anyone else is unauthorized. If you are
> not the intended recipient, any disclosure, copying, distribution or any
> action taken in reliance on it is prohibited and may be unlawful. If you
> received this communication in error please notify us immediately and
> destroy the original message.  Thank you.
>
>
>
> --
> Ken Martin PhD
> Distinguished Engineer
> Kitware Inc.
> 28 Corporate Drive
> Clifton Park NY 12065
>
> This communication, including all attachments, contains confidential and
> legally privileged information, and it is intended only for the use of the
> addressee.  Access to this email by anyone else is unauthorized. If you are
> not the intended recipient, any disclosure, copying, distribution or any
> action taken in reliance on it is prohibited and may be unlawful. If you
> received this communication in error please notify us immediately and
> destroy the original message.  Thank you.
>
> _______________________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at
> http://www.kitware.com/opensource/opensource.html
>
> Please keep messages on-topic and check the VTK FAQ at:
> http://www.vtk.org/Wiki/VTK_FAQ
>
> Search the list archives at: http://markmail.org/search/?q=vtkusers
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-- 
Cory Quammen
Staff R&D Engineer
Kitware, Inc.