POV-Ray : Newsgroups : povray.advanced-users : 2-pass photons Server Time
31 Oct 2024 19:28:28 EDT (-0400)
  2-pass photons (Message 1 to 3 of 3)  
From: Mike Thorn
Subject: 2-pass photons
Date: 9 Nov 2004 14:44:58
Message: <41911e3a$1@news.povray.org>
Is it possible to run photons in two passes, similar to the handy method 
used for 2-pass radiosity?

I'm just wondering if I'm going to have to run photons again for a 
highres version of my scene, or whether I can just load up the photon 
map I've saved at the small resolution.


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From: Andrew
Subject: Re: 2-pass photons
Date: 9 Nov 2004 15:59:14
Message: <41912fa2$1@news.povray.org>
"Mike Thorn" <mik### [at] realitycheckmultimediacom> wrote in 
message news:41911e3a$1@news.povray.org...
> Is it possible to run photons in two passes, similar to 
> the handy method used for 2-pass radiosity?
>
> I'm just wondering if I'm going to have to run photons 
> again for a highres version of my scene, or whether I can 
> just load up the photon map I've saved at the small 
> resolution.



Yes, it's possible.

See section 3.5.3.2.1  "Photon Global Settings" in the 
manual, specifically the save_file and load_file keywords.


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From: Mike Thorn
Subject: Re: 2-pass photons
Date: 9 Nov 2004 19:25:53
Message: <41916011$1@news.povray.org>
Andrew wrote:
> Yes, it's possible.
> 
> See section 3.5.3.2.1  "Photon Global Settings" in the 
> manual, specifically the save_file and load_file keywords. 

Yes, I knew about that, but do the photons adjust adequately when 
loading a lowres map at a higher resolution? Since I'm already loading a 
map, more photons won't be shot. Will the scene still render the same 
result or will it be spotty in some way?

The obvious answer is to try it, I know...I'm in the process of doing 
that, but it's taking a while. My scene has been running for 8 hrs 
already at 25% of full-size and it's only just over 50% complete. It's 
taken about three hours to progress 6%. It'll be a while before I can 
run it at a higher resolution (which will itself probably take several 
days).


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