[Radiance-general] Missing solar source visibility from gendaylit for multiple ambient-bounces

[J. Alstan Jakubiec]

Hi Greg -- thanks for the reply. Indeed setting -ps 1 fixes the issue. 
At this resolution, the solar disc is actually ~5 x 5 pixels, so it must 
have been a very near miss with the default of -ps 4.

Best,
Alstan

On 6/2/2015 12:25 AM, Greg Ward wrote:
> It's probably just being missed during the initial sampling, which is 
> random.  Try setting "-ps 1" on the command line, or use "set ps 1" 
> within rvu.
>
> Cheers,
> -Greg
>
>> *From: *"J. Alstan Jakubiec" <alstan at jakubiec.net 
>> <mailto:alstan at jakubiec.net>>
>>
>> *Subject: *Re: [Radiance-general] Missing solar source visibility 
>> from gendaylit for multiple ambient-bounces
>>
>> *Date: *June 1, 2015 6:53:24 AM PDT
>>
>> *
>> *
>>
>> To reply to my own post, I had another generic office model sitting 
>> around, so I applied the same materials, same sky model and same 
>> rendering parameters, but the solar disc showed up this time. So 
>> perhaps it had something to do with how obj2rad was constructing the 
>> surfaces? *Shrugs*
>>
>> Alstan
>>
>> On 6/1/2015 11:54 AM, J. Alstan Jakubiec wrote:
>>> Dear List,
>>>
>>> I'm running into a bit of a frustrating issue, and I am not sure 
>>> what the cause might be. I am creating a sky model using gendaylit 
>>> with a high amount of direct solar component as seen below,
>>> > gendaylit 05 18 8.667 -W 881 63 -a 1 -o -104 -m -120
>>>
>>> The issue is that when I render my scene using -ab 1, I can see the 
>>> solar disc. When I render it with a higher number of ambient 
>>> bounces, such as 4, the solar disc is absent from the final 
>>> visualization. You can see the results here: 1 ambient bounce 
>>> <https://dl.dropboxusercontent.com/u/3175325/ab1.png>, 4 ambient 
>>> bounces <https://dl.dropboxusercontent.com/u/3175325/ab4.png>. You 
>>> will notice that in the rendering with 4 ambient bounces, the 
>>> shadows are still cast properly as if the sun is present.
>>> I am using a slightly older version of Radiance right now (RADIANCE 
>>> 4.2a lastmod  by  on w015t-001), but I suspect that isn't the root 
>>> of the problem. This issue also occurs when I use gensky 
>>> <https://dl.dropboxusercontent.com/u/3175325/ab4_clsky.png>. I have 
>>> never seen this kind of behavior before from Radiance. Does anyone 
>>> have thoughts as to what might cause this?
>>>
>>> Thank you,
>>> Alstan
>
>
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