Tutorial: Absorption in Cycles using the Raylength-Node
Create more realistic transparent materials in Cycles with this videotutorial by BlenderDiplom.
Gottfried Hofmann writes:Have you ever wondered how those crazy node-groups for faking absorption with the new ray-length-node are working? This tutorial shows you how the trick is done from the very basic of how Cycles is treating light and transparency to the fully-fledged node-group for re-use in your own projects. You will also learn how to translate a physical formula into Cycles nodes.
This is probably my most didactic tutorial ever.
Link
I’m already thinking about the possibilities for a skin shader! thx
Read from here:
http://blenderartists.org/forum/showthread.php?216866-Cycles-tests-the-new-blender-CPU-GPU-renderer-of-awesomeness&p=2216773&viewfull=1#post2216773
Cool, I’ve added the link to the description of the tutorial at BD :)
Cool I am looking forward to learn this. Hopefully one day we can mix this with caustics :)
I hope one day caustics in Cycles will be based on Photon Map or a similar feature. Right now it’s almost unusable (sigh…).
Very handy tutorial!
Thank you, Gottfried! It’s very wide explanation! I don’t like to work with formulae but seems it’s not so scary :)
You may like to try modifying each colour (wavelength) separately for more realistic results. Since there’s an exponential function in there, it’s not a linear relationship that you can just multiply though, so using a single absorption value to blend between colours doesn’t fully capture it all.
See here: http://blenderartists.org/forum/showthread.php?216113-Brecht-s-easter-egg-surprise-Modernizing-shading-and-rendering&p=2113051&highlight=#post2113051
Simple + powerful = Great stuff!
Thank you very much!
Very cool! More realism!