Fresnel effects -- plugin tool 2004-01-20 - By tonyno@(protected)
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Fresnel effects vary based on the viewing angle; the normal refraction shader
component is constant over the entire object.
Tony
-- --Original Message-- --
From: nospam2 <nospam2@(protected)>
Sent: Jan 20, 2004 11:42 AM
To: onelistdrs <Carrara@(protected)>
Subject: Re: [Carrara] Fresnel effects -- plugin tool
Hello onelistdrs,
Apart special effects in shaders (such as faking an electronic microscope) I
never quite understood the reason there would be a need for Fresnel add-on for
ordinary photorealistic renderings.
What's called the Fresnel effect is in fact nothing but another way to describe
the refraction indice of the material.
Since refraction is one of the shaders channels in Carrara, I do'nt see why the
effect would not be rendered by the rendering engine (appart if one wants to
artificaialy increase the effect for esthetical purposes).
Any lights (!) on this would be welcome.
Tuesday, January 20, 2004, 5:53:41 PM, you wrote:
o> Sharing some recent information, and as usual, Eric is helpful and
o> very responsive to his customers.....
o> Doug,
o> Feel free to repost my reply.
o> I named it Fake Fresnel because it simply goes from white to
o> black as the surface normal turns away from the camera, with some
o> adjustment on how quickly it rolls off. This is not a true Fresnel
o> effect, but gives similar results for many situations. Because it's
o> not a real Fresnel effect, you can also use it in shader channels
o> other than refraction, reflection, and transparency. Additionally it
o> requires less steps to set up.
o> As I understand the ZMorphics tool, it does real Fresnel
o> calculations so will give a correct answer so to speak. It may have
o> other capabilities that I am not aware of. I've got ZTools, but all
o> I've used is the Soft Reflections, which are really nice BTW.
o> So to sum up, Fake Fresnel is a little more versatile (with
o> regards to shader channels) and easier to set up. ZMorphics Fresnel
o> tools will give you an accurate, correct render.
o> Best regards,
o> Eric Winemiller
o> Digital Carvers Guild
o> 3D plug-ins for Carrara
o> http://digitalcarversguild.com
o> -- -- Original Message -- --
o> To: Eric Winemiller
o> Sent: Monday, January 19, 2004 2:38 PM
o> Subject: fresnel
o> Questions:
o> Why did you name your plug-in "fake" fresnel? Does it give us the
o> real effect or only something similar? What's missing?
o> Is your plug-in different/better/not as good as the fresnel effect
o> from zmorphics/lost horizon?
o> If you wish you can reply to me or post your answer to the Yahoo
o> Carrara list......or allow me to post your reply?
o> Thanks,
o> I think you are doing a great job on your plug-in's and I'm just
o> looking to find out what is best for me and the kind of creating I do.
o> Doug
--
Best regards,
nospam2 mailto:nospam2@(protected)
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