Re: Fresnel effects -- plugin tool 2004-01-21 - By steven_mcq
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Something to bear in mind when considering any "optical" effect in a
3D render: raytracing does not work the way real light does. The
rays are traced in reverse from the direction of real world light
propagation and there is no simulation of light's wave properties.
Optical effects are achieved through the application of rules: bend
the traced ray a certain amount for a given index of refraction, for
example. Eric and Brian have enriched the available rules with their
Fresnel plug-ins. Some rules that exist in nature the Carrara user
has to apply case by case, such compensating for the decoupling of
object color and object transparency in Carrara. Some rules can only
be approximated, such as caustics effects that shouldn't be examined
too closely. The impression is the thing, even for photorealistic
rendering, when the impression sought is the illusion of a
photograph.
SMcQ
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