Search found 23 matches
- Wed May 09, 2007 12:25 pm
- Forum: Indigo General Stuff
- Topic: Converting your RGB colour To NK
- Replies: 54
- Views: 24391
Converting your RGB colour To NK
Here is a win32 program that convert most of the RGB colour to NK http://www.renderlight.co.uk/images/nktest.png http://www.renderlight.co.uk/images/rgbtonk.png http://www.renderlight.co.uk/files/rgbtonk.exe Just enter the rgb value and press 'To NK' button. The result nk data should be display in t...
- Wed May 09, 2007 8:52 am
- Forum: Indigo General Stuff
- Topic: NK - physically correct? (not this time ;)
- Replies: 20
- Views: 4848
This is just the NK databasesth wrote:I found this on google...
http://swiss.csail.mit.edu/~jaffer/FreeSnell/
What do you think about it?
- Wed May 09, 2007 4:38 am
- Forum: Indigo General Stuff
- Topic: NK - physically correct? (not this time ;)
- Replies: 20
- Views: 4848
one way of doing it: Assuming the extinction coefficent is zero refraction index = (1+sqrt(R))/((1-sqrt(R)) where 0 <= R < 1 To give you an example suppose you have rgb colour of value <0.0, 0.9, 0.0> (green) use the above formula red refraction index = (1+sqrt(0))/(1-sqrt(0)) -> 1 green refrcation ...
- Wed May 09, 2007 3:21 am
- Forum: Indigo General Stuff
- Topic: NK - physically correct? (not this time ;)
- Replies: 20
- Views: 4848
- Wed May 09, 2007 3:15 am
- Forum: Bugs and Requests
- Topic: [BUG] NK data file parsing
- Replies: 9
- Views: 4332
You really need more than nk file to defined gems nk file give you the refraction index, As far as I can tell for dielectric they only gives you the real part of the refraction index and rarely give the imaginary part which give the extinction coefficent (from that you can get the absorption coeffic...
- Fri May 04, 2007 11:54 am
- Forum: Exporter Development
- Topic: chiu filter
- Replies: 18
- Views: 7551
- Thu Apr 26, 2007 9:17 am
- Forum: Bugs and Requests
- Topic: Indigo image quality.
- Replies: 16
- Views: 4890
IMO mitchell netravali filter is not good for filtering global illumination image, and indeed any filter which uses negative weights unless you apply the filter after you tonemapped your global illumination image. This is because the negative weights of the mitchell netravali can cause black edges (...
- Tue Apr 17, 2007 1:34 pm
- Forum: Indigo General Stuff
- Topic: Looking for definition of nk file format
- Replies: 9
- Views: 1911