[Radiance-general] distance forsky dome

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Hello, Radiance-general.


For making material, $B!F!G(BPicture Perfect RGB Rendering Using Prefiltering 
and Sharp Color Primaries$B!G!G(B is very helpful for me.

Now I have another problem.

I$B!G(Bd like to make sky dome that material depend on sky distribution 
measured 145 points. These 145 points relate to CIE IDMP. I think the best 
way is to make it by using $B!H(Bbrightfunc$B!I(B and $B!H(Bsource$B!I(B which has o 
distance. But this is very difficult way for me. 
Then I made it by using square*145 by $B!H(Bpolygon$B!I(B. I know this way give sky 
distance. Maybe distance between room and sky is important. 

When the radius of sky dome was changed so that indoor (1.5m * 1.2*1.3m) 
illuminance by rtrace might become suitable, the almost same value as an 
actual measurement was acquired in the radius of 200m.But rendered picture 
is not good.
Giving sky material ;

void glow sky_1
0
0
4	luminance/179  luminance/179  luminance/179  0

$B!D(B*145.

I have some questions.
1: When I make sky dome, is to use $B!H(Bpolygon$B!I(Bthat have distance suitable? 
2: Supposing that is right, is there any suitable radius to sky dome?
3;And for material of sun,is "lumiance/179" suitable??

I$B!G(Bm confusing$B!D(BPlease give advice.

Kouichi kobayashi
Tokyo University of Science

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