POV-Ray: Newsgroups: povray.text.scene-files: Fancy sphere with 'Path-tracing'

POV-Ray : Newsgroups : povray.text.scene-files : Fancy sphere with 'Path-tracing'		Server Time 21 Dec 2024 21:59:22 EST (-0500)

From: triple r
Subject: Fancy sphere with 'Path-tracing'
Date: 26 Apr 2008 20:50:01
Message: <web.4813cd90a966cb25dcb320720@news.povray.org>

From p.b.i, here's the source for the sphere.  Use it.  Mutilate it.  Take
credit for it.  Just post a picture to the newsgroup if you do!  The
instructions for the diffuse reflection are included.  Some assembly required,
but you do NOT need to know anything about C++ to make the changes and compile
it.

 - Ricky

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Attachments:
Download 'sphere.pov.txt' (12 KB)

From: Thomas de Groot
Subject: Re: Fancy sphere with 'Path-tracing'
Date: 10 May 2008 04:52:07
Message: <48256237$1@news.povray.org>

Hello Ricky!  Thank you for your file! I shall have to study it seriously to 
get to understand it :-)
Concerning radiosity, I have a suggestion:

"triple_r" <nomail@nomail> schreef in bericht 
news:web.4813cd90a966cb25dcb320720@news.povray.org...
> //I'm SURE you can optimize this quite a bit.  I'm no
> //good at optimizing radiosity.  Here's proof:
> radiosity{ //(untested):
>     normal on
>     count 400
>     error_bound 0.03
>     recursion_limit 4
>     pretrace_start 0.08
>     pretrace_end 0.01
> }

You rarely need that very low error_bound, and it slows things down 
dramatically. Also, count is probably way to low then too. You do not have 
any interesting normals here, so you can switch that off (speed gain!). 
Finally, the recursion_limit can be brought back to 1 I guess.
I had a very satisfying and fast render with:

    normal off
    count 500
    error_bound 1.0
    recursion_limit 1
    pretrace_start 0.08
    pretrace_end 0.01

I do not pretend to undertand all about radiosity, but over the years and 
thanks to the help of the many knowledgeable people on these ng's, I have 
slowly found out what I should and what I should not do. I hope I can be a 
bit of help in turn...

Thomas

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From: Robert McGregor
Subject: Re: Fancy sphere with 'Path-tracing'
Date: 10 May 2008 10:45:02
Message: <web.4825b4b375deb954bd1b3ad10@news.povray.org>

"triple_r" <nomail@nomail> wrote:
> From p.b.i, here's the source for the sphere.  Use it.  Mutilate it.  Take
> credit for it.  Just post a picture to the newsgroup if you do!  The
> instructions for the diffuse reflection are included.  Some assembly required,
> but you do NOT need to know anything about C++ to make the changes and compile
> it.
>
>  - Ricky

Thanks Ricky, this is a thing of beauty... and now I have something fun to do
this weekend :)

-Rob

"There is no spoon."

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