[Radiance-general] Blotching caused by translucent material

[Andrew McNeil]

Chris, I think you're suggestion is valid, particularly for reducing the
size of the blotches.
Andy


On Fri, Jun 12, 2015 at 11:03 AM, Christopher Rush <
Christopher.Rush at arup.com> wrote:

>  I retract my answer. Andy is right about it being splotches in the
> direct transmission. I was too quick to jump to conclusions when I read
> your subject and barely looked at the images.
>
>
>
> *From:* Christopher Rush [mailto:Christopher.Rush at arup.com]
> *Sent:* Friday, June 12, 2015 1:52 PM
> *To:* Radiance general discussion
> *Subject:* Re: [Radiance-general] Blotching caused by translucent material
>
>
>
> Orn,
>
> With clear glass, a very significant contribution is made by the direct
> sun, so all the ambient bounces (and their calculation parameters)
> contribute less to the scene, and you see less blotches.
>
>
>
> For the translucent glass, try again with all of your first run
> parameters, but instead of -ar 64 try -ar 500 or -ar 1000. This probably
> has the biggest impact on visibility of blotches. This is particularly
> important if your model includes a room that’s part of a much larger
> building, or a full building floor with a very large site context modeled
> around it.
>
>
>
> In the parameters you tested in the second run, when you increased –ad and
> lowered –aa those should also improve accuracy, but might not be necessary
> depending on how much importance you put on accuracy versus calculation
> time.
>
>
>
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