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| Class | Reflectance | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Synopsis |
Approximation of glass-like materials using ray tracing, supporting reflection and refraction.
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| Arguments |
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| Location | lishray | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Description |
A reflectance model that supports an approximation of
glass-like materials that have both reflective
and transmissive properties.
Secondary mirrored and transmitted views are incorporated
by the use of ray tracing.
Reflectance coefficients are provided as arguments which allow
specification of the amount of the specular
light component ( "specular factor",
and the contribution made by light from
the mirror ( "mirror factor")
and transmission ( "transmission factor")
directions.
The sharpness of the specular reflection highlights can
be controlled by means of argument "roughness".
The reflection is made sharper with small values for the
roughness, such as 0.1.
Larger values, such as 1.0, decrease the specular fall-off.
The index of refraction for all wavelengths of light
is given by the argument "refraction".
The default value for the refractive index
corresponds to that for glass.
The appropriate value for other materials can be obtained from
published data in handbooks of optical constants.
This model is approprate for approximating glass surface finishes.
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