[Radiance-general] Specular Reflections with the Daylight Coefficient Method

[Rob Guglielmetti]

Thanks dude!

- Rob

On Jun 2, 2010, at 9:44 AM, Greg Ward wrote:

> Hi Rob,
> 
> Genskyvec always picks the three closest patches, regardless of the sky resolution.  It would be difficult to use a sky resolution high enough that one patch would be the better choice.  I only mentioned the 1-4 range because that's what people have done, not as a recommendation per se.
> 
> The important thing is to distribute energy according to which patches are closest, so if the sun really is in the middle of a particular patch, very little energy would be given to neighboring patches.  That "very little" should probably be zero in some cases, but I don't think it ever quite is in genskyvec with the weighting function I use.
> 
> -Greg
> 
>> From: "Guglielmetti, Robert" <Robert.Guglielmetti at nrel.gov>
>> Date: June 2, 2010 7:37:00 AM PDT
>> 
>> Greg, all:
>> 
>> So what is the protocol for determining the number of patches the sun's energy is distributed across? In Axel Jacob's (excellent) tutorial on rtcontrib three patches are used to represent the sun regardless of whether the Tregenza or the finer Reinhart patch density/distributions are used, but you mention one to four patches being used, Greg. How or when would this number change? Does genskyvec actually make a choice?
>> 
>> - Rob
> 
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