Re: [Interest] R: Qt3D FPS limits

[Nikos Chantziaras]

Using vsync as a frame rate limiter is not a good idea, because of 
different refresh rates between monitors. On a 144Hz monitor, you'd be 
running at 144FPS even if that's not actually wanted.


Or, you might want to run at half the refresh rate (like 30FPS on a 60Hz 
monitor.)


Vsync and frame limiting are two different, unrelated things.


On 23/03/18 10:29, Paul Lemire wrote:
Qt3D relies on your GPU vsync settings. To reach the maximum number of 
FPS, just disable vsync in your driver settings. If on the other hand 
you want to reduce FPS, call setSwapInterval on the 
QSurfaceFormat::defaultFormat and set it before starting your Qt3D 
application with QSurfaceFormat::setDefaultFormat.


Paul


On 03/21/2018 07:46 PM, Xavier Bigand wrote:
If you want to lower the limit you can simply add a pause in the 
rendering thread before the swap buffer based on a timer.
I don't really know how to do that with qt3d, but with qt quick there 
is some slot like onBeforeRendering and onAfterRendering in which you 
should be able to insert a FPS limiter.


In a general way you have to be really careful when doing such things 
because it can add some jitters in the animations if the frame-rate 
isn't constant due to a lack of precision of the timers or conflicts 
with the vsync,...



2018-03-21 17:58 GMT+01:00 Igor Mironchik >:




On 21.03.2018 19 :39, Carlo Ferraresi wrote:

Hi,
I also noticed that PFS seem limited to 60.
I would like to know if there is a way to set this threshold
since even 30 FPS are enough for my application.


Agree, and I would like to have possibility to change the limit,
and to have possibility to set the limit to infinity...



Regards,
C.


On : mercoledì 21 marzo 2018 12:02

A: Qt Project >
Oggetto: [Interest] Qt3D FPS limits

Hello,

Does Qt 3D limits FPS by 60? Or FPS is always as much as
possible?

Thank you.




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Re: [Interest] R: Qt3D FPS limits

[Paul Lemire]

Qt3D relies on your GPU vsync settings. To reach the maximum number of
FPS, just disable vsync in your driver settings. If on the other hand
you want to reduce FPS, call setSwapInterval on the
QSurfaceFormat::defaultFormat and set it before starting your Qt3D
application with QSurfaceFormat::setDefaultFormat.

Paul


On 03/21/2018 07:46 PM, Xavier Bigand wrote:
> If you want to lower the limit you can simply add a pause in the
> rendering thread before the swap buffer based on a timer.
> I don't really know how to do that with qt3d, but with qt quick there
> is some slot like onBeforeRendering and onAfterRendering in which you
> should be able to insert a FPS limiter.
>
> In a general way you have to be really careful when doing such things
> because it can add some jitters in the animations if the frame-rate
> isn't constant due to a lack of precision of the timers or conflicts
> with the vsync,...
>
>
> 2018-03-21 17:58 GMT+01:00 Igor Mironchik  >:
>
>
>
> On 21.03.2018 19 :39, Carlo Ferraresi wrote:
>
> Hi,
> I also noticed that PFS seem limited to 60.
> I would like to know if there is a way to set this threshold
> since even 30 FPS are enough for my application.
>
>
> Agree, and I would like to have possibility to change the limit,
> and to have possibility to set the limit to infinity...
>
>
>
> Regards,
> C.
>
>
> On : mercoledì 21 marzo 2018 12:02
>
> A: Qt Project  >
> Oggetto: [Interest] Qt3D FPS limits
>
> Hello,
>
> Does Qt 3D limits FPS by 60? Or FPS is always as much as
> possible?
>
> Thank you.
>
> ___
> Interest mailing list
> Interest@qt-project.org 
> http://lists.qt-project.org/mailman/listinfo/interest
> 
>
> ___
> Interest mailing list
> Interest@qt-project.org 
> http://lists.qt-project.org/mailman/listinfo/interest
> 
>
>
> ___
> Interest mailing list
> Interest@qt-project.org 
> http://lists.qt-project.org/mailman/listinfo/interest
> 
>
>
>
>
> -- 
> Xavier
>
>
> ___
> Interest mailing list
> Interest@qt-project.org
> http://lists.qt-project.org/mailman/listinfo/interest


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Re: [Interest] R: Qt3D FPS limits

[Xavier Bigand]

If you want to lower the limit you can simply add a pause in the rendering
thread before the swap buffer based on a timer.
I don't really know how to do that with qt3d, but with qt quick there is
some slot like onBeforeRendering and onAfterRendering in which you should
be able to insert a FPS limiter.

In a general way you have to be really careful when doing such things
because it can add some jitters in the animations if the frame-rate isn't
constant due to a lack of precision of the timers or conflicts with the
vsync,...


2018-03-21 17:58 GMT+01:00 Igor Mironchik :

>
>
> On 21.03.2018 19:39, Carlo Ferraresi wrote:
>
>> Hi,
>> I also noticed that PFS seem limited to 60.
>> I would like to know if there is a way to set this threshold since even
>> 30 FPS are enough for my application.
>>
>
> Agree, and I would like to have possibility to change the limit, and to
> have possibility to set the limit to infinity...
>
>
>
>> Regards,
>> C.
>>
>>
>> On : mercoledì 21 marzo 2018 12:02
>>
>>> A: Qt Project 
>>> Oggetto: [Interest] Qt3D FPS limits
>>>
>>> Hello,
>>>
>>> Does Qt 3D limits FPS by 60? Or FPS is always as much as possible?
>>>
>>> Thank you.
>>>
>>> ___
>>> Interest mailing list
>>> Interest@qt-project.org
>>> http://lists.qt-project.org/mailman/listinfo/interest
>>>
>> ___
>> Interest mailing list
>> Interest@qt-project.org
>> http://lists.qt-project.org/mailman/listinfo/interest
>>
>
> ___
> Interest mailing list
> Interest@qt-project.org
> http://lists.qt-project.org/mailman/listinfo/interest
>



-- 
Xavier
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Re: [Interest] R: Qt3D FPS limits

[Igor Mironchik]

On 21.03.2018 19:39, Carlo Ferraresi wrote:

Hi,
I also noticed that PFS seem limited to 60.
I would like to know if there is a way to set this threshold since even 30 FPS 
are enough for my application.


Agree, and I would like to have possibility to change the limit, and to 
have possibility to set the limit to infinity...




Regards,
C.


On : mercoledì 21 marzo 2018 12:02

A: Qt Project 
Oggetto: [Interest] Qt3D FPS limits

Hello,

Does Qt 3D limits FPS by 60? Or FPS is always as much as possible?

Thank you.

___
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http://lists.qt-project.org/mailman/listinfo/interest

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[Interest] R: Qt3D FPS limits

[Carlo Ferraresi]

Hi, 
I also noticed that PFS seem limited to 60.
I would like to know if there is a way to set this threshold since even 30 FPS 
are enough for my application.

Regards,
C.


On : mercoledì 21 marzo 2018 12:02
>A: Qt Project 
>Oggetto: [Interest] Qt3D FPS limits
>
>Hello,
>
>Does Qt 3D limits FPS by 60? Or FPS is always as much as possible?
>
>Thank you.
>
>___
>Interest mailing list
>Interest@qt-project.org
>http://lists.qt-project.org/mailman/listinfo/interest

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