Hello everyone:
I am wondering that is there a kind of glass which can allow more light
transmit into internal space and can diffuse the transmitted light,
especially sunlight, to avoid glare?
By the way, How can i difine the property of this glass in Radiance?
Is any one can help me?
Hi Victor!
I am wondering that is there a kind of glass which can allow more light transmit into internal space and can diffuse the transmitted light, especially sunlight, to avoid glare?
There are lots of such products. What you describe would lead to frosted glass, which can be describes in Radiance using the trans modifier. In most cases, one would use clear glass, acrylic, polycarbonat with a structure to scatter or redirect light. This has the advantage that unlike diffuse materials, which also reflect back light to the outside, with clear geometry you can still make sure that the light enters your room.
Cheers
Lars.
Thank you very much!
frosted glass can scatter sunlight to avoid glare buy it would have lower
transmittance.
You just mentioned a structure with clear glass, acrylic, polycarbonat. I am
wondering what kind of structure it is and is any product in the market?
i am using Desktop Radiance. How can i difine this kind of property in
Desktop radiance?
By the way i am wondering, Radiance for UNIX and Desktop Radiance which one
is more popular and more people use?
2009/10/13 Lars O. Grobe <[email protected]>
Hi Victor!
I am wondering that is there a kind of glass which can allow more light
transmit into internal space and can diffuse the transmitted light,
especially sunlight, to avoid glare?There are lots of such products. What you describe would lead to frosted
glass, which can be describes in Radiance using the trans modifier. In most
cases, one would use clear glass, acrylic, polycarbonat with a structure to
scatter or redirect light. This has the advantage that unlike diffuse
materials, which also reflect back light to the outside, with clear geometry
you can still make sure that the light enters your room.Cheers
Lars.
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Hi Victor!
frosted glass can scatter sunlight to avoid glare buy it would have lower transmittance.
Yes, as the scattering results in some of the light being reflected back, the transmittance has to be lower.
You just mentioned a structure with clear glass, acrylic, polycarbonat. I am wondering what kind of structure it is and is any product in the market?
There are lots of products, if you look at what companies are offering for "advanced daylighting", "daylight redirecting", you will find many options. It all depends on your application. Most systems either use refraction or total reflection to have a dielectric surface redirect light. Sometimes this works like with lenses, sometimes it is simply reflecting light from selected directions into another direction.
i am using Desktop Radiance. How can i difine this kind of property in Desktop radiance?
In general - not at all. Most of these systems can be modeled using the photon map, which is an addition to Radiance but not part of Desktop Radiance. There is also rtcontrib which may be used, but this is a rather new tool, while Desktop Radiance, as far as I know, is based on very old code. It is possible to model redirecting materials as long as they do not concentrate light (so most planar surfaces) using prism.
By the way i am wondering, Radiance for UNIX and Desktop Radiance which one is more popular and more people use?
I was not aware of anyone using Desktop Radiance any more. As far as I know, all updates during the recent years were in Radiance only, I do not know whether anyone is working on Desktop Radiance. Folks on windows systems in general use one of the windows distributions of Radiance, people who need integration into a GUI have options like brad or the Sketchup-extension, there are tools such as Rayfront. I do not know anyone using Desktop Radiance these days.
Cheers, Lars.