POV-Ray : Newsgroups : povray.binaries.images : GSOPP Server Time: 23 Jul 2019 12:24:27 GMT
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From: clipka
Subject: Re: GSOPP
Date: 27 Sep 2018 23:38:40
Message: <5bad6a00$1@news.povray.org>
Am 27.09.2018 um 13:08 schrieb Jim Holsenback:

> yeah i think i might give relaxing area light parameters and see if i
> can see any gains in time. you didn't say anything about focal blur. not
> jitter per se but it's mechanism noise based... right?

That was intentional, because I'm currently not sure how random it is,
and how reproducible the randomness is.

If focal blur uses a random seed based on "pixel address", for instance,
then oversampling the same pixel again and again will always give the
same blur sample directions, which means -am3 can't improve the blur result.


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From: Alain
Subject: Re: GSOPP
Date: 27 Sep 2018 23:39:17
Message: <5bad6a25$1@news.povray.org>
Le 18-09-27 à 07:08, Jim Holsenback a écrit :
> On 9/26/18 8:12 AM, clipka wrote:
>> Am 26.09.2018 um 12:10 schrieb Jim Holsenback:
>>
>>> since i used radiosity, area lights, focal blur and am3...next time i
>>> have 62 hrs of free computer time i /might/ give it some more attention
>>
>> While quality settings normally have a tendency to stack up pretty
>> brutally, am3 is somewhat different in this respect, as it lets you get
>> away with lower settings on other features - provided they can be set to
>> produce random noise instead of biased artifacts.
>>
>> For example, area lights can be set to produce random noise by turning
>> on jitter. If you're using am3 anyway, you can then crank down on the
>> other area light quality settings.
>>
>> (Radiosity, on the other hand, is an example where this doesn't work, as
>> its artifacts are biased, not random-noise-ish.)
>>
>>
>> This comes in particularly handy when combining multiple "jitterable"
>> features, e.g. area lights + media + SSLT + micronormals (the latter two
>> always being "jittery" by nature).
>>
> 
> yeah i think i might give relaxing area light parameters and see if i 
> can see any gains in time. you didn't say anything about focal blur. not 
> jitter per se but it's mechanism noise based... right?

It's possible that you may be able to use adaptive 0 for those. If it's 
not good, try adaptive 1.
With adaptive 0, you can use some insane values for your area_light, like :
area_light x y  1025 1025 circular orient adaptive 0

and still get good performances.
Using adaptive 0 don't turn the feature off, neither will using adaptive 
off.
The only way to turn adaptive off is to remove adaptive from the definition.


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From: Jim Holsenback
Subject: Re: GSOPP
Date: 30 Sep 2018 09:18:35
Message: <5bb094eb$1@news.povray.org>
On 9/27/18 7:39 PM, Alain wrote:
> It's possible that you may be able to use adaptive 0 for those. If it's 
> not good, try adaptive 1.
> With adaptive 0, you can use some insane values for your area_light, like :
> area_light x y  1025 1025 circular orient adaptive 0
> 
> and still get good performances.
> Using adaptive 0 don't turn the feature off, neither will using adaptive 
> off.
> The only way to turn adaptive off is to remove adaptive from the 
> definition.

i removed jitter and used adaptive 0 (with /no/ other area light 
changes) and cut 20 hours off the render time...3 cheers for +am3...i'm 
a fan!


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From: Thomas de Groot
Subject: Re: GSOPP
Date: 30 Sep 2018 11:06:13
Message: <5bb0ae25$1@news.povray.org>
On 30-9-2018 11:18, Jim Holsenback wrote:
> On 9/27/18 7:39 PM, Alain wrote:
>> It's possible that you may be able to use adaptive 0 for those. If 
>> it's not good, try adaptive 1.
>> With adaptive 0, you can use some insane values for your area_light, 
>> like :
>> area_light x y  1025 1025 circular orient adaptive 0
>>
>> and still get good performances.
>> Using adaptive 0 don't turn the feature off, neither will using 
>> adaptive off.
>> The only way to turn adaptive off is to remove adaptive from the 
>> definition.
> 
> i removed jitter and used adaptive 0 (with /no/ other area light 
> changes) and cut 20 hours off the render time...3 cheers for +am3...i'm 
> a fan!

Out of curiosity, what were your values for +a, +ac, and +r, using +am3?

-- 
Thomas


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From: Jim Holsenback
Subject: Re: GSOPP
Date: 30 Sep 2018 12:56:53
Message: <5bb0c815$1@news.povray.org>
On 9/30/18 7:06 AM, Thomas de Groot wrote:
> On 30-9-2018 11:18, Jim Holsenback wrote:
>> On 9/27/18 7:39 PM, Alain wrote:
>>> It's possible that you may be able to use adaptive 0 for those. If 
>>> it's not good, try adaptive 1.
>>> With adaptive 0, you can use some insane values for your area_light, 
>>> like :
>>> area_light x y  1025 1025 circular orient adaptive 0
>>>
>>> and still get good performances.
>>> Using adaptive 0 don't turn the feature off, neither will using 
>>> adaptive off.
>>> The only way to turn adaptive off is to remove adaptive from the 
>>> definition.
>>
>> i removed jitter and used adaptive 0 (with /no/ other area light 
>> changes) and cut 20 hours off the render time...3 cheers for 
>> +am3...i'm a fan!
> 
> Out of curiosity, what were your values for +a, +ac, and +r, using +am3?
> 
+am3 +a0.015 +ac0.995 +r3


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From: Thomas de Groot
Subject: Re: GSOPP
Date: 1 Oct 2018 06:40:07
Message: <5bb1c147$1@news.povray.org>
On 30-9-2018 14:56, Jim Holsenback wrote:
> On 9/30/18 7:06 AM, Thomas de Groot wrote:
>> On 30-9-2018 11:18, Jim Holsenback wrote:
>>> On 9/27/18 7:39 PM, Alain wrote:
>>>> It's possible that you may be able to use adaptive 0 for those. If 
>>>> it's not good, try adaptive 1.
>>>> With adaptive 0, you can use some insane values for your area_light, 
>>>> like :
>>>> area_light x y  1025 1025 circular orient adaptive 0
>>>>
>>>> and still get good performances.
>>>> Using adaptive 0 don't turn the feature off, neither will using 
>>>> adaptive off.
>>>> The only way to turn adaptive off is to remove adaptive from the 
>>>> definition.
>>>
>>> i removed jitter and used adaptive 0 (with /no/ other area light 
>>> changes) and cut 20 hours off the render time...3 cheers for 
>>> +am3...i'm a fan!
>>
>> Out of curiosity, what were your values for +a, +ac, and +r, using +am3?
>>
> +am3 +a0.015 +ac0.995 +r3

OK, thanks. Confirms what I am using in general; been using +r4 for 
serious cases. With hindsight, I see that in my Paris scene I used 
adaptive 1 and jitter on for the street lights. I should turn them off 
to gain much needed render time.

-- 
Thomas


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