[Radiance-general] Modeling a film w/ 50% haze and 91% tranmission.

[Tim Perry]

Dear Chris, Andy,

Thank you for the reference and the feedback. I think I'll use Andy's
definition even though the distribution of light is definitely not
lambertian. It should provides sufficiently accurate results for the
task at hand.

I think I'll ask the client if they have a BSDF first though.

Thanks again,
Tim


On Mon, Mar 11, 2013 at 11:05 AM, Andrew McNeil <amcneil at lbl.gov> wrote:
> Hi Tim,
>
> Haze is the percentage of transmitted light which deviates from the incident
> direction.  So you could interpret the haze to mean that 50% of the
> transmitted light is diffused.
>
> As a first approximation I would use trans with the following transmission
> properties:
> Ts = 0.455
> Td = 0.455
>
> Though with a haze of 50% assuming that the scattered light is lambertian is
> a bit of a stretch.
>
> Andy
>
>
> On Mon, Mar 11, 2013 at 10:45 AM, Tim Perry <tim.v2.0 at gmail.com> wrote:
>>
>> Hello,
>>
>> I've been asked to model windows that have a film with 50% haze and
>> 91% transmission.
>>
>> I do not have a BSDF for the material. The best option I can think of
>> is to use the trans material with 91% transmission and hope that it
>> provides about 50% haze. Does anyone have experience modeling film
>> based on haze? If so, any pointers? A tutorial I should look at?
>>
>> Thanks,
>> Tim Perry
>>
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>
>
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