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HGScatterer Class Reference

A Henyey-Greenstein phase function. More...

#include <surfaceshaders/HGScatterer.h>

Inheritance diagram for HGScatterer:

Inheritance graph
[legend]
List of all members.

Public Member Functions

 HGScatterer (const rgb &_albedo, double _g)
rgb sampleKernel (const Vector3 &w_out, const HitRecord &rec, Context &context, Vector3 &w_in, double &pdf) const
double pdfDirection (const Vector3 &w_out, const Vector3 &w_in, const HitRecord &rec, Context &context) const
rgb kernel (const Vector3 &w_out, const Vector3 &w_in, const HitRecord &rec, Context &context) const

Detailed Description

A Henyey-Greenstein phase function.

Member Function Documentation

rgb HGScatterer::sampleKernel (  const Vector3 &  w_out,
const HitRecord &  rec,
Context &  context,
Vector3 &  w_in,
double &  pdf
)  const [virtual]
 

Sample a SurfaceShader kernel.

Parameters:
[in] w_out Unit-length vector pointing away from the surface.
[in] rec HitRecord associated with the point to be shaded.
[in,out] context The rendering context.
[out] w_in Generated directional sample (unit-length vector).
[out] pdf Value of pdf for generated sample (w_in).
Returns:
The value of the kernel for the pair w_out, w_in.

Reimplemented from SurfaceShader.

double HGScatterer::pdfDirection (  const Vector3 &  w_out,
const Vector3 &  w_in,
const HitRecord &  rec,
Context &  context
)  const [virtual]
 

Evaluate the pdf of sampling w_in given w_out. This must be consistent with the sampleKernel function.

Parameters:
[in] w_out Unit-length vector pointing away from the surface.
[in] w_in Unit-length vector used to sample incident radiance.
[in] rec HitRecord associated with point to be shaded.
[in,out] context The rendering context.
Returns:
The evaluated value of the pdf for w_in given w_out.

Reimplemented from SurfaceShader.

rgb HGScatterer::kernel (  const Vector3 &  w_out,
const Vector3 &  w_in,
const HitRecord &  rec,
Context &  context
)  const [virtual]
 

Returns the value of the kernel ($brdfcos(\theta)$ for surfaces or $\Lambda p(\omega_o, \omega_i)$ for volumes) for the given incoming and outgoing directions. This function must be consistent with the value returned by the sampleKernel function.

Parameters:
[in] w_out Unit-length vector pointing away from the surface.
[in] w_in Unit-length vector used to sample incident radiance.
[in] rec HitRecord associated with point to be shaded.
[in,out] context The rendering context.
Returns:
The value of the kernel for the given directions.

Reimplemented from SurfaceShader.

The documentation for this class was generated from the following files:
Generated on Wed Jul 20 16:15:22 2005 for galileo by  doxygen 1.4.3