FRESNEL

THE BOX'S MAIN HELP:

This function returns the fraction of reflected light Kr,
the fraction of refracted light Kt, the direction of the
refracted ray R and the direction of the transmitted ray T.

II (input):

The entering ray direction.
This must be a vector.  The default is the incidence vector, I.
refer to page 329 in the RenderMan Companion.

NN (input):

This must be a normal.  The default is the surface normal, N.
This is the normal of the surface point to be shaded, P.
If the surface point P has been changed, calculatenormal(P)
should be used to recalculate N before shading.
refer to page 329 in the RenderMan Companion.

eta (input):

The index of refraction between the two materials.
This must be a float.
refer to page 329 in the RenderMan Companion.

Kr (output):

Returns a float which represents the fraction of reflected light.
refer to page 329 in the RenderMan Companion.

Kt (output):

Returns a float which represents the fraction of refracted light.
refer to page 329 in the RenderMan Companion.

R (output):

Returns the direction vector of reflected ray.
refer to page 329 in the RenderMan Companion.

T (output):

Returns the direction vector of transmitted ray.
refer to page 329 in the RenderMan Companion.

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