[Radiance-general] 5-phase method model reflectance

[Andrew McNeil]

Hi Giulio,

A jitter of 100% will lead to aiming failure?

Greg (and David G-M) changed the way direct jittering works for round
sources so that there are no longer aiming failures (
http://www.radiance-online.org/community/workshops/2009-boston-ma/Presentations/GW_RadianceImprovements.pdf
).

and also setting a specular threshold to 100% will mean no specular
> sampling?

You want to turn specular sampling off for the direct sun coefficient
matrix to avoid double counting in the 5-phase method.

Best,
Andy



On Wed, Jun 17, 2015 at 1:53 PM, giulioandrea antonutto foi <
geotrupes at me.com> wrote:

> Off topic completely…
> your setting for dj and st are a bit odd. maybe interesting to know if
> there is a reason.
> A jitter of 100% will lead to aiming failure?
> and also setting a specular threshold to 100% will mean no specular
> sampling?
> unless there is a reason? new radiance settings meaning different things?
> just a curiosity.
> G.
>
>
>
> On 17 Jun 2015, at 17:56, Eleonora Brembilla <E.Brembilla at lboro.ac.uk>
> wrote:
>
> At first I thought the reflectances assigned to the model would not matter
> for the part that is specific to the 5-phase, as the model is assigned a
> black material, but comparing the resulting matrices it looks like the Sun
> Coefficient Matrix (.dsc) changes with the original materials’ reflectances
> (and it’s the only matrix that change). And that is exactly the matrix that
> is taking most of the computational effort (about 4 hours I think - the
> same model with the 2-phase method takes 5 minutes, glazing is all simple
> clear glass).
>
>
>
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