[Ves] Frame rate in Kiwiviewer for IOS. glkview drawInRect

[Pat Marion]

Hi Carlos,

The KiwiViewer 1.0 app for iOS and Android only renders when needed,
whereas KiwiViewer 2.0 for iOS always renders (redraws) at 30 fps.  Larger
models will prevent a redraw rate of 30 fps, but still, the app runs an
animation loop.  The animation loop is active by default.  To prevent
rendering, you can set the "paused" property of the GLKViewController, then
it will only redraw when explicitly requested.  But then the view won't
redraw at all, even when the camera moves during touch interactions, or
some other setting is changed like background color, camera projection
mode, current dataset, etc.  Adding the application logic so that the view
only redraws when necessary was a feature on the todo list, but it hasn't
made it into the app, yet.  I agree, it does result in increased battery
usage.

Pat


On Mon, Jun 24, 2013 at 2:39 PM, Aashish Chaudhary <
aashish.chaudhary at kitware.com> wrote:

> On Mon, Jun 24, 2013 at 2:01 PM, Carlos <ves at calculoandamios.com> wrote:
>
>> Hi,****
>>
>> ** **
>>
>> I have some models that reduce the frame rate from the target of 30 fps
>> to 1 or 2. After some debugging I have found that the FPS in the settings
>> view means the number of times per second that the view is refreshed J.**
>> **
>>
>> ** **
>>
>> I have one concern about this and it is the energy consumption of the
>> App. I cannot understand why the drawInRect function is called so many
>> times *if nothing changes in the view*. With heavy models, ie. models
>> that need more than 1/30 seconds to be drawn, the app is always running so
>> the battery will be drained more quickly than needed.****
>>
>> ** **
>>
>> Is there any reason in IOS to call so many times per second to the
>> drawinRect function and also to redraw the whole model every time.?****
>>
>> ** **
>>
>> I’m thinking in add some flags so when some actions is done on the screen
>> the model will be paint but if not, do not make a render call. Does it make
>> sense?
>>
>
> Yes, the feature was / is there. I have tested the latest code but it
> should be there where only when something changes we render again. @Pat
> might know more about this. But you are right we should support this if
> somehow we
> lost this feature.
>
> - Aashish
>
>
>
>> ****
>>
>> ** **
>>
>> Best regards,****
>>
>> ** **
>>
>> Carlos****
>>
>> ** **
>>
>> _______________________________________________
>> Ves mailing list
>> Ves at public.kitware.com
>> http://public.kitware.com/cgi-bin/mailman/listinfo/ves
>>
>>
>
>
> --
> | Aashish Chaudhary
> | R&D Engineer
> | Kitware Inc.
> | www.kitware.com
>
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>
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