User talk:Sineaggi

Hello,

About "Oren–Nayar reflectance model":

The original value 0.33 *is* the simplified model, as written in the equations on page 8 above the footnote.

The footnote seems to be about different issue.

I'd suggest to undo this change.

Abvgdee (talk) 03:10, 28 July 2015 (UTC)

Hi!

Most of the programming articles I've seen using the simplified model change the constant from 0.33 to 0.57.

Here is a book using 0.57 as the simplified constant. https://books.google.com/books?id=g_PRBQAAQBAJ&pg=PA263&lpg=PA263&dq=oren+nayar+%220.57%22&source=bl&ots=XjCJp1dERI&sig=BYnVjwx0hKuZNeinGa2yE5PldZE&hl=en&sa=X&ved=0CD0Q6AEwBWoVChMI9frytIX-xgIVDTWICh2qvg5j#v=onepage&q=oren%20nayar%20%220.57%22&f=false

Here are some online examples: http://ruh.li/GraphicsOrenNayar.html http://content.gpwiki.org/index.php/D3DBook:(Lighting)_Oren-Nayar#The_Oren-Nayar_Equation https://lva.cg.tuwien.ac.at/ecg/wiki/doku.php?id=students:oren-nayar

Though there are also other examples that use the constant 0.33. http://oliverm-h.blogspot.com/2012/02/how-to-use-oren-nayar-lighting-for-ue3_13.html

Sineaggi (talk) 14:34, 28 July 2015 (UTC)

I didn't know that. May be then change back, and add a note like "However, for better visual appearance, most prefer increased value, up to.."? Some people may be more interested in simulation accuracy (like me), and not care about the looks. Anyway, I'm not expert, so I won't argue. — Preceding unsigned comment added by Abvgdee (talk • contribs) 17:05, 5 August 2015 (UTC)