cz.cuni.jagrlib.iface
Interface MicrofacetDistribution

All Known Implementing Classes:

AnisotropicMicrofacet, BlinnMicrofacet

public interface MicrofacetDistribution

Abstract interface represents microfacet distribution. Microfacets help to model rough surfaces as a heightfield with statistically generated faces.

Since:

0.26

See Also:

MicrofacetDistribution.java

Method Summary

double	D(double[] half) Return a microfacet distribution term.
double	pdf(double[] in, double[] out) Return the probability density function.
double	sample(MicroFacet mf, double[] in, double u, double v, double[] out, double[] brdf) Sample the given microfacet distribution.

Method Detail

sample

double sample(MicroFacet mf,
              double[] in,
              double u,
              double v,
              double[] out,
              double[] brdf)

Sample the given microfacet distribution.

Parameters:

mf - The MicroFacet (point on surface of some solid).

in - Input direction (should look from the hit point).

u - Random uniform number.

v - Random uniform numbers.

out - Output direction in world coordinates.

brdf - Color definition - double[C] array (C can be either 1 /for monochrome computing/, 3 /for RGB color system/ or greater /for more complex spectral color sampling/).

Returns:

Probability density function.

pdf

double pdf(double[] in,
           double[] out)

Return the probability density function.

Parameters:

in - Input direction in local coordinates.

out - Output direction in local coordinates.

D

double D(double[] half)

Return a microfacet distribution term.

Parameters:

half - Half-vector in local coordinates.