[Radiance-general] distance forsky dome

Wed, 19 Nov 2003 01:38:58 +0900

Hello Kouichi,

I think the best way is using Brightdata or Colordata. I know these take a
data file as input, but I`ve never tried them myself.

another problem is the value measured at sun`s position. As I understood
your method, you`d be modeling the sun with a polygon of greater area than
the real sun, but with the same luminance, which will produce excessive
illuminance. One solution could be to use an average value over the surface
(difficult to calculate) so you`d get correct illuminance but wrong
luminances... or am I missing something? Probably someone with more
experience can correct me here.

Santiago

> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]]On Behalf Of $B>.NS(B $B9I(B
> $B0l(B
> Sent: Wednesday, November 19, 2003 12:06 AM
> To: [email protected]
> Subject: [Radiance-general] distance forsky dome
>
>
> 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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