[Radiance-general] Re: Glare and evaluation of lightshelves
Carlos Ochoa
[email protected]
Sun, 23 Nov 2003 05:15:45 -0600 (CST)
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Hi Phillip,
Thanks for the email about glare, I tried to identify the glare source as you said, but I think if you send the spreadsheet you mentioned could be very useful!
Many thanks,
Carlos
Phillip Greenup <[email protected]> wrote:
Hi Carlos,
Are you predicting glare using the DGI? if you are, there may be some errors produced by potential glare sources behind the field of view.
findglare identifies potential glare sources. then glarendx -t dgi takes these sources and calculates glare indices in a range of directions. take a look at the predicted dgi's at adjacent directions. if there is an obvious jump in dgi between adjacent directions, then you probably have a glare source behind the field of view. To fix, simply remove the offending glare source from the file output by findglare, and re-run glarendx -t dgi. if that doesn't make any sense, let me know and i'll send you a spreadsheet i developed to identify problematic glare sources.
For Greg, or whoever else might be interested, the problem is in the calculation of dgi's omega in glarendx.c. where the glare source is behind the field of view, posindex returns -1, p becomes 0 and omega is much bigger than adjacent levels. this means the glare source is artificially inflated, and the glare index jumps up.
Phil.
_______________________________
Phillip Greenup
Specialist Engineer
Arup Australasia
Level 10, 201 Kent St
Sydney NSW 2000
Ph (02) 9320 9426
Fax (02) 9320 9321
>>> [email protected] 18/11/2003 9:15:11 pm >>>
Hi Greg,
The pictures were generated using the fish-eye view, they
are looking from the middle of one of the long walls of the
room to the other (the expected position of the user). So I
have the window on one side of the picture and the bottom
of the room on the other.
I give the findglare both the octree and the picture name,
but I get the same results just as if specifying only the
picture. By the way, just giving findglare the octree and
direction of the view gives an error message in DR 2.0. I
have also increased the number of ambient bounces, but it
doesn't change, either.
Carlos
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<DIV>Hi Phillip,</DIV>
<DIV> </DIV>
<DIV>Thanks for the email about glare, I tried to identify the glare source as you said, but I think if you send the spreadsheet you mentioned could be very useful!</DIV>
<DIV> </DIV>
<DIV>Many thanks,</DIV>
<DIV>Carlos<BR><BR><B><I>Phillip Greenup <[email protected]></I></B> wrote:</DIV>
<BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">Hi Carlos,<BR><BR>Are you predicting glare using the DGI? if you are, there may be some errors produced by potential glare sources behind the field of view.<BR><BR>findglare identifies potential glare sources. then glarendx -t dgi takes these sources and calculates glare indices in a range of directions. take a look at the predicted dgi's at adjacent directions. if there is an obvious jump in dgi between adjacent directions, then you probably have a glare source behind the field of view. To fix, simply remove the offending glare source from the file output by findglare, and re-run glarendx -t dgi. if that doesn't make any sense, let me know and i'll send you a spreadsheet i developed to identify problematic glare sources.<BR><BR>For Greg, or whoever else might be interested, the problem is in the calculation of dgi's omega in glarendx.c. where the glare source is behind the field of
view, posindex returns -1, p becomes 0 and omega is much bigger than adjacent levels. this means the glare source is artificially inflated, and the glare index jumps up.<BR><BR>Phil.<BR><BR>_______________________________<BR>Phillip Greenup<BR>Specialist Engineer<BR>Arup Australasia<BR>Level 10, 201 Kent St<BR>Sydney NSW 2000<BR>Ph (02) 9320 9426<BR>Fax (02) 9320 9321<BR><BR><BR>>>> [email protected] 18/11/2003 9:15:11 pm >>><BR>Hi Greg,<BR><BR>The pictures were generated using the fish-eye view, they<BR>are looking from the middle of one of the long walls of the<BR>room to the other (the expected position of the user). So I<BR>have the window on one side of the picture and the bottom<BR>of the room on the other.<BR><BR>I give the findglare both the octree and the picture name,<BR>but I get the same results just as if specifying only the<BR>picture. By the way, just giving findglare the octree and<BR>direction of the view gives an error message in DR 2.0.
I<BR>have also increased the number of ambient bounces, but it<BR>doesn't change, either.<BR><BR>Carlos<BR><BR>_________________________________________________________<BR>Do You Yahoo!?<BR>Información de Estados Unidos y América Latina, en Yahoo! Noticias.<BR>Visítanos en http://noticias.espanol.yahoo.com <BR>_______________________________________________<BR>Radiance-general mailing list<BR>[email protected] <BR>http://www.radiance-online.org/mailman/listinfo/radiance-general<BR><BR><BR>_______________________________________________<BR>Radiance-general mailing list<BR>[email protected]<BR>http://www.radiance-online.org/mailman/listinfo/radiance-general</BLOCKQUOTE><p><br><hr size=1 noshade><b>Do You Yahoo!?</b><br>
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