Re: Fresnel effects -- plugin tool 2004-01-20 - By nospam2
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Hello m3d242,
m> Refraction occurs no matter what angle you look at the object.
No, you are wrong.
If the angle is too low, the light cannot enter the material that has the
highest refraction indice.
In this case, there is no refraction : only reflection.
Reflection occures all the time, while refraction, in some cases, doesn't
occure.
m> The index of
m> refraction is a calulation of how light bends when passing through
m> transparent material (water, glass)
True
m> it has no bearing on how transparent the object is.
True, but, an object can be 100 % transparent and still not allow a ray light
to enter it, if this ray has a too small angle with it.
This is exactly the Fresnel effect.
m> You seem to be saying that refraction and transparency are the
m> same thing and they are not.
I never wrote that.
>> Since the Carrara optical model does includes a refraction indice, Carrrara
m> should be able to render, without any extra plug-in, the so-called "Fresnel
m> effect".
m> Not so, because refraction and Fresnel are not interchangeable. They are not
m> the same thing.
True
m> The Fresnel dictates how an object (dependent of the
m> viewing angle) appears to go from transparent to reflective. It has nothing
to
m> do with how light refracts through said object.
False. The Fresnel effect has everything to do with the refraction : it is a
consequence of refraction.
When two objects have the same refraction indice, there is no Fresnel possible
effect between them.
Think about the rainbow : the rainbow is not a property of the rain : it is a
consequence of teh law of refraction.
It is the same for the Fresnel effect : it is not a physical property of the
lake surface, it is a consequence of its refraction indice being differnt (and
higher) thyan the air one.
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