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23 Feb 2024 03:05:37 EST (-0500)
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From: Thomas de Groot
Subject: Re: Ringworld scene
Date: 11 Feb 2021 02:28:16
Message: <6024dc90@news.povray.org>
Op 10/02/2021 om 11:29 schreef Mike Horvath:
> On 2/9/2021 2:36 AM, Thomas de Groot wrote:
>> I wonder if at that distance an area_light is really effective. A 
>> point light (with parallel) would probably be much faster and without 
>> any visual difference.
>>
> 
> The area light is necessary to create the fuzzy shadows. (Otherwise 
> shadows would have a sharp edge and the lighted regions would be larger 
> than the shadow regions IIRC.)
> 
> A 6x6 area light may be excessive though. Dunno.
> 
> 
> Mike

Ah, yes. Forgot about the shadow squares indeed. I seem to remember now 
that I had some trouble of the kind, back when I modelled the Ringworld 
(ten years ago? I am not sure)

-- 
Thomas


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From: Alain Martel
Subject: Re: Ringworld scene
Date: 11 Feb 2021 11:12:24
Message: <60255768$1@news.povray.org>

> On 2/9/2021 2:36 AM, Thomas de Groot wrote:
>> I wonder if at that distance an area_light is really effective. A 
>> point light (with parallel) would probably be much faster and without 
>> any visual difference.
>>
> 
> The area light is necessary to create the fuzzy shadows. (Otherwise 
> shadows would have a sharp edge and the lighted regions would be larger 
> than the shadow regions IIRC.)
> 
> A 6x6 area light may be excessive though. Dunno.
> 
> 
> Mike
If using adaptive, that 6x6 become 9x9.

As for using parallel... That would only work for a small part of the 
ring.  parallel can't be used when the light_source is surrounded by 
shadow casting elements.


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From: Mike Horvath
Subject: Re: Ringworld scene
Date: 17 Feb 2021 19:37:45
Message: <602db6d9$1@news.povray.org>
On 10/13/2013 2:18 AM, posfan12 wrote:
> Here's the scene file for my ringworld attempt. Any suggestions? Especially on
> how to make the atmosphere appear?
> 
> 
> Mike
> 


Latest code can be found here:

https://github.com/mjhorvath/Mike-Wikipedia-Illustrations/tree/master/Miscellaneous/ringworld


Mike


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