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Kerkythea Rendering System • View topic - Colouredglass -absorbtion vs falloff
Page 1 of 1

Colouredglass -absorbtion vs falloff

PostPosted: Wed Jan 13, 2010 11:14 am
by rusted
i am trying to get a nice coloured glass with the colour gradation working well according to thickness.there are two methods suggested -in material guide and later materials like "blurry green glass"

i feel the older method of making absorbtion white colour and varying falloff colour and power gives correct result(Glass2).while, Glass1 colouring is uniform-doesnt vary with thickness

which is the correct method?

PostPosted: Wed Jan 13, 2010 12:13 pm
by notareal
If you have no measured n-k file in use, then absorption & falloff is up to your "artistic view" of correct material. When looking these render, for me glass 2 looks better, but from render I can't say that first on is incorrect. Should look on materials if there something wrong.

PostPosted: Thu Jan 14, 2010 9:15 am
by tridem

PostPosted: Thu Jan 14, 2010 12:51 pm
by rusted

Re: Colouredglass -absorbtion vs falloff

PostPosted: Tue Jan 03, 2012 6:12 pm
by tridem
I've found this old thread, very useful to understand fog panel's settings! :D
Now I would like to share some tips about it.
I've noticed when the Falloff multiplier is greater than 1 (most cases, I believe) the color is inverted. To prevent this you should insert the inverse of your choosen color, simply enter in the RGB values the difference to 255.

absorption.jpg


A multiplier too much high may change the hue at higher depth, as if it was causing kinda over-saturation
in this case is better using a darker color!

2012-01-03_1828.png

Re: Colouredglass -absorbtion vs falloff

PostPosted: Fri Jan 06, 2012 11:50 am
by Sergio
Great tip Tridem!

Re: Colouredglass -absorbtion vs falloff

PostPosted: Sun Jan 08, 2012 9:39 pm
by tridem
thanks Sergio, though...I'm not so sure its behavior changes for values greater than 1, I believe it works anyway with inverted color because falloff means a subtraction. Surely the color box had changed but I'm not able to reproduce the event and say what's the rule #-o