Dear Martin, Minki,
Thanks for the replies, I guess what I was trying to calculate (and to
whom dr. Martin refers to) is better called cubical illuminance; the
script Greg shared with Minki (thanks as always, Greg!) allows to sample
a full sphere in one go.
I think I have my ideas a lot clearer now, I'll just need to implement
either one of the approaches.
Thanks,
Giovanni
···
From: Moeck, Dr. Martin [mailto:[email protected]]
Sent: 08 May 2012 12:52
To: 'Radiance general discussion'
Subject: Re: [Radiance-general] integral of radiation in one point
-spherical illuminance
Hi Giovanni,
that is called spherical illuminance. As an approximation, you could
calculate 6 illuminance values (up, down, East, West, North, South) and
average them. Christopher Cuttle wrote a few papers on spherical
illuminance.
Regards
Martin Moeck
OSRAM
________________________________
From: Giovanni Betti [mailto:[email protected]]
Sent: Tuesday, May 08, 2012 1:42 PM
To: Radiance general discussion
Subject: [Radiance-general] integral of radiation in one point
Dear list,
I have question that I hope you'll help get my head around.
I want to calculate the overall illuminance on a point in space that is,
regardless of directionality.
I have made some simplified 2d sketches for clarity.
As I understand a radiance sensor point in rtrace will have cosine
related sensitivity (image01)
If I am to place two coincident with opposing normals (image2) I'll miss
on contributions from the sides.
Rotating the normals by 90 degrees at a time (figure 3) and summing
contributions might not work either because will overestimate diagonal
contributions (figure 4 ).
So I'm not getting too much closer to the solution...
Is there something that I am missing here?
Any light on this will be appreciated,
Best,
Giovanni Betti