[Radiance-general] Specifying surface properties from BTDF data

[Frank Holly]

Hi Greg, Thanks for the reply.

I found the Photon Map Manual here http://www.cb-d.de/rz/pmap.pdf and it 
says on page 5 that transdata is not a supported type of material "due to 
the high sampling overhead in conjunction with the photon map. A wavelet 
representation is being developed for these. (But don't hold your 
breath...)"

Is there any other possible solution?

Frank

>From: "Gregory J. Ward" <gregoryjward at gmail.com>
>Reply-To: Radiance general discussion 
><radiance-general at radiance-online.org>
>To: Radiance general discussion <radiance-general at radiance-online.org>
>Subject: Re: [Radiance-general] Specifying surface properties from BTDF 
>data
>Date: Fri, 20 Apr 2007 14:57:53 -0700
>
>Hi Frank,
>
>The transdata function will allow you to specify an arbitrary BRDF on  a 
>surface, but it won't necessarily do what you want unless you use  the 
>photon-mapping add-on by Roland Schregle.  I plan to work on a  module that 
>will create "window sources" similar to mkillum given  measured BTDF data, 
>but this won't be ready for some months.
>
>I realize this isn't much help, but I'm afraid the options are  currently 
>somewhat limited.
>
>-Greg
>
>>From: "FrankBob Holly" <istvan43 at hotmail.com>
>>Date: April 20, 2007 11:14:38 AM PDT
>>
>>I'm pretty new to Radiance, so please bear with me ;)
>>
>>I have a commercial forward ray tracing program that I use to model  
>>complex window glazings. I can output the transmitted flux vs  outgoing 
>>direction for light incident at different angles.
>>
>>How would I create a surface in Radiance which would behave in the  same 
>>way as observed using the forward ray tracer. BRTDfunc? Can I  specify 
>>arbitrary output distributions for a comprehensive sampling  of all 
>>incoming directions? Is there a "BRTDdata" surface type?
>>
>>Any ideas? Other things I should be aware of?
>>
>>Thanks
>>
>>Frank
>
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