[Radiance-general] Blotching caused by translucent material

[Christopher Rush]

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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