[Radiance-general] gensky question

[Bleicher, Thomas]

Chris.
 
Glad you solved your problem, sort of.
 
I just want to add one comment:
 
If you add the "-i" switch to rpict/rtrace the surface properties
for the last bounce will be replaced with a Lambertian surface
which is what you are looking for (completely diffuse reflection).
 
For you it might be the simplest solution to do an irridience
calculation with only one bounce. The real properties of the
diffuser (your plastic definition) don't make any difference then.
 
For an illustration of this see the color prints of the reception
desk in RwR (plate 15).
 
Thomas
 


  _____  

From: radiance-general-bounces at radiance-online.org
[mailto:radiance-general-bounces at radiance-online.org] On Behalf Of Chris
Foster
Sent: 25 July 2006 09:30
To: Radiance general discussion; Radiance general discussion
Subject: RE: [Radiance-general] gensky question



Hi Tom,

Thanks for your help. The angles thing has sorted itself out now. I
thought i read somewhere that east of south was positive, but obviously
not! From my results it makes sense if it were your way.

I near enough did what you recommended already, but i dont think i
clarified what i wanted judging by your response.

>>If I understand you right you want a material with 100 % diffuse
transmittance.

I am after a material with 100% diffuse reflectance

My material,reflector.rad

void plastic reflector_mat
0
0
5 1 1 1 0 0

reflector_mat ring reflector
0
0
8 0 0 0
  0 -1 0
  5 0

An example of one of my xforms,

!xform -n reflector -t 0 0 10 -rz 38 -rx -48.8 reflector.rad

These angles are following the azimuth and altitude of the sun, i used
rz and rx because of the way my ring was made. I have made my plastic
material with a 0,0 spec and roughness value to get a perflectly
reflecting diffuse surface (r,g,b are 1,1,1). Im now aim to look
directly at my surface and measure the luminance from it.
 
There isnt really a question in this email, just thought id reply to
yours, thanks for your help!

Chris 



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