POV-Ray : Newsgroups : povray.general : Media: rendering needs verry long for the last few percent Server Time
30 Nov 2022 19:17:36 EST (-0500)
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From: Alain Martel
Subject: Re: Media: rendering needs verry long for the last few percent
Date: 6 May 2022 09:25:41
Message: <627521d5$1@news.povray.org>
Le 2022-05-06 à 02:55, Thomas de Groot a écrit :
> Op 05/05/2022 om 19:45 schreef Alain Martel:
>> So, try using +rb16 or +rb12 and see if there is any improvement.
>> Also, changing the rendering pattern so that the rendering start near 
>> the centre could help to at least hide some of the slowdown by having 
>> the problem blocks starting to get rendered sooner.
> 
> Just nitpicking: +rb should be +bs
> 
> ;-)
> 
Sorry :(


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From: Alain Martel
Subject: Re: Media: rendering needs verry long for the last few percent
Date: 6 May 2022 09:28:25
Message: <62752279$1@news.povray.org>
Le 2022-05-06 à 02:00, Thomas de Groot a écrit :
> Op 05/05/2022 om 23:05 schreef Kenneth:
>> Thorsten <tho### [at] trfde> wrote:
>>>
>>> If you want a better distribution of the computational load, you should
>>> decrease the render block size such that your object gets distributed
>>> between multiple render blocks.
>>>
>>> Thorsten
>>
>> That works very well, thanks! From my own 'naive' analysis, I had been 
>> wondering
>> if a smaller block size would help, but I never tried it. (For my 
>> tests, I
>> forgot to mention that my media object occupies about 50% of the 
>> screen space--
>> unlike the OP's small object that is probably 'enclosed' by a single 
>> render
>> block.) Your suggestion works in both cases, of course.
>>
>> A smaller render-block size has another great advantage: The scene 
>> renders
>> faster.
>> Here is my example (using scattering media):
>>
>> block size of 64 pixels: 2 mins 16 sec
>> block size of 8 pixels:  1 min 10 sec
>>
>> That's a definite improvement! And my machine's processor seems to run 
>> less hot,
>> based on the cooling-fan speed.
>>
>>
> Ha! Never thought about that 'trick'!
> 
It's highly scene dependent.
On some scenes that already render fast, it can cause the renter time to 
increase.
Then, there are cases where it don't have a significant effect.


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From: Alain Martel
Subject: Re: Media: rendering needs verry long for the last few percent
Date: 6 May 2022 09:31:17
Message: <62752325$1@news.povray.org>
Le 2022-05-06 à 08:11, Thomas de Groot a écrit :
> Op 5-5-2022 om 09:35 schreef Thorsten:
> 
>> If you want a better distribution of the computational load, you 
>> should decrease the render block size such that your object gets 
>> distributed between multiple render blocks.
>>
> 
> Is this also true when doing a stochastic render? Generally, I use:
> 
> +am3 +a0.03 +ac0.90 +r3
> 
> Is adding +bs12 (for instance) relevant in that case?
> 
> Thanks
> 

Yes. It is relevant in most scene where the time needed to render a 
block varies greatly.
If all blocks take about the same amount of time to render, it will have 
little to no effect.


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From: Thomas de Groot
Subject: Re: Media: rendering needs verry long for the last few percent
Date: 7 May 2022 02:11:51
Message: <62760da7$1@news.povray.org>
Op 06/05/2022 om 15:31 schreef Alain Martel:
> Le 2022-05-06 à 08:11, Thomas de Groot a écrit :
>> Op 5-5-2022 om 09:35 schreef Thorsten:
>>
>>> If you want a better distribution of the computational load, you 
>>> should decrease the render block size such that your object gets 
>>> distributed between multiple render blocks.
>>>
>>
>> Is this also true when doing a stochastic render? Generally, I use:
>>
>> +am3 +a0.03 +ac0.90 +r3
>>
>> Is adding +bs12 (for instance) relevant in that case?
>>
>> Thanks
>>
> 
> Yes. It is relevant in most scene where the time needed to render a 
> block varies greatly.
> If all blocks take about the same amount of time to render, it will have 
> little to no effect.
> 

Thanks! Good to know. I shall jot this down along with my other notes.

-- 
Thomas


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