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

[Greg Ward]

Hi John,

Firstly, you should move your illum's to just inside the windows, 
rather than having them on the outside.  This should reduce the bizarre 
color artifacts you're seeing.  Secondly, you should increase your -ar 
parameter a bit and simultaneously increase -ad and -as parameter 
values.  This should reduce the splotches you are seeing in corners.  
Decreasting the -aa value might help as well, but I would try that next 
if these suggestions don't solve the problem.

-Greg

> From: "John Sutherland" <js0754 at bris.ac.uk>
> Date: March 29, 2004 10:01:29 AM PST
>
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.

...