[Radiance-general] Still having trouble, new pics........

[Giulio Antonutto]

just a quick check: 
are you sure to be using illum in the window surfaces? you miss the typical
fake shadows this solution implies....
I guess you can use an illum surface outside of the windows, pointing
inside, close to the glass and with a good -pj of 0.6 ?0.8 and -ds < 0.1
eliminate all the fake shadow... doing this way the 'arlechine' effect
should go away... I guess
also... remember to set -av... seems to be a little high...
 
if you use -aa more than 0.3 with low values for -ad and -as you can save
time and eliminate artefacts... well artefacts are too big to be visible...
sometimes is a good trick to speed up renderings, other time it is not, just
try ;-))
 
cheers
giulio
 
 
PS another option is to use a good -ad value, more than 1024, may be you can
reduce a little ar to speed up, say -ar 64?96 ... 
or the crazy solution: -aa 0  -ad 32 -as 4 -ab 1 -ps  1 -pj .8 (or if you
can 2)....
 
-----Original Message-----
From: John Sutherland [mailto:js0754 at bris.ac.uk]
Sent: 29 March 2004 19:01
To: radiance-general at radiance-online.org
Subject: [Radiance-general] Still having trouble, new pics........


Firstly, to Lars grobe in reply to how I mapped the texture on to the
surface of the book from my last post. The book was made in Maya, nurbs
surface -> polygon -> obj2mesh , the texture mapping was also done in maya,
basically it's a planar map going straight through the book as though you
were reading it. The texture was just a photo looking straight onto the
book, and the planar map causes it to stretch and bend on the surface the
right amount. Wasn't tricky at all.
 
Secondly, was a bit confused by Georg's advice when you said -aa should be
increased, did you mean increased in accuracy? ie putting aa to a lower
value? Or did you mean increasing aa by setting it to a higher value?
Because the lower the aa value the more accurate the picture, so I can only
see setting aa lower than .15 as a good thing not higher?
 
Well anyway I definitely don't think aa is the problem anyway. Since the
last renders I sent out ive brightened the stained glass a bit so more light
gets in, and the results this time are pretty crazy! The glass is rose
window at the front is projecting loads of blotches of colour.
 
Check out these renders, in the first I used 
 
-x 2560 -y 2048 -ar 128 -ad 512 -aa .15 -as 256 -ab 5
 
in the second I set the -aa to .10 and halved the ad and as , as the
rendering time would have been stupid
 
-x 2560 -y 2048 -ar 128 -ad 256 -aa .10 -as 128 -ab 5
 
The second has much larger colour splotches which suggests to me that its
not the ambient accuracy, and the splotch are being cause by to low ad and
as. So im doing a render now with ad and as up at 1024 and 512, we shall see
how that goes. If any one has any other ideas please say! I need to get some
results inside this building soon as my project is due in soon!
 
 
https://www.bris.ac.uk/fluff/u/js0754/iBqEK1g3QV8ruqxb269Qsg7j/Output8.jpg
<https://www.bris.ac.uk/fluff/u/js0754/iBqEK1g3QV8ruqxb269Qsg7j/Output8.jpg>

 
https://www.bris.ac.uk/fluff/u/js0754/VW4ynFc05IgiAVwIbzPjuA7j/Output9pcondl
owaa.jpg
<https://www.bris.ac.uk/fluff/u/js0754/VW4ynFc05IgiAVwIbzPjuA7j/Output9pcond
lowaa.jpg> 
 
Thanks guys!
 
John
 
 

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