dielectric Element Reference

Wavelength-dependent, thin dielectric BSDF. The opacity input controls the transmittance versus reflectance of different wavelengths. A pure specular mirror may be obtained by creating a dielectric BSDF with zero opacity. Conversely, a purely transparent surface may be obtained by creating a dielectric with full opacity. Note that a completely transparent surface will still reflect some light (in proportion to Fresnel's Laws) because refraction is undefined past a critical angle when light is traveling between a lighter and denser medium. When this happens, some light is reflected regardless of the opacity parameter, and this is typically known as total internal reflection. More...

Inheritance diagram for dielectric:

List of all members.

Attributes
clampedSpectrum	opacity
	Wavelength-dependent parameter which specifies the transmittance of the material.
clampedSpectrum	ks
	Wavelength-dependent spectrum which scales / attenuates the overall reflectance of the material (specular albedo).

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Detailed Description

Wavelength-dependent, thin dielectric BSDF. The opacity input controls the transmittance versus reflectance of different wavelengths. A pure specular mirror may be obtained by creating a dielectric BSDF with zero opacity. Conversely, a purely transparent surface may be obtained by creating a dielectric with full opacity. Note that a completely transparent surface will still reflect some light (in proportion to Fresnel's Laws) because refraction is undefined past a critical angle when light is traveling between a lighter and denser medium. When this happens, some light is reflected regardless of the opacity parameter, and this is typically known as total internal reflection.

Note:

bsdf::specular and bsdf::transmissive are special cases of bsdf::dielectric with opacity set to 1 and 0 respectively.

dielectric corresponds to the underlying Milton class 'DielectricBSDF.'

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Attribute Documentation

clampedSpectrum dielectric::opacity

Wavelength-dependent parameter which specifies the transmittance of the material.

type	clampedSpectrum
optional	true
default	1 (completely opaque)
units	unitless

clampedSpectrum dielectric::ks

Wavelength-dependent spectrum which scales / attenuates the overall reflectance of the material (specular albedo).

type	clampedSpectrum
optional	true
default	0.5
units	unitless