UberLight Class Reference

An implementation of Pixar's UberLight shader. More...

#include <lightshaders/UberLight.h>

Inheritance diagram for UberLight:

[legend]List of all members.

Public Member Functions
	UberLight (float width, float height, float wedge, float hedge, float cuton, float cutoff, float nearedge, float faredge, float nearfarbound, float roundness, float falloff, const rgb &intensity, const Vector3 &location, const Matrix &object2light)
void	estimateRadiance (const HitRecord &rec, Context &context, Vector3 &w_in, double &distance, rgb &radiance) const

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Detailed Description

An implementation of Pixar's UberLight shader.

For more information on the UberLight see: "Lighting Controls for Computer Cinematography", Barzel, JGT 97. The shader code is based on an sl shader by Larry Gritz.

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Member Function Documentation

void UberLight::estimateRadiance (  const HitRecord &  rec, Context &  context, Vector3 &  w_in, double &  distance, rgb &  radiance )  const [virtual]

Estimate the radiance this light deposits towards a point in the scene. The light should not attempt an intersection with the scene to determine if an occlusion exists. Occlusion testing can be performed by the caller with the retured 'w_in' and 'distance'. Singular light sources, such as point lights, would only implement this function and allow the caller to test for occlusion. LightShaders intended for area lights may also implement this function as it may allow for importance sampling of luminaires based on estimated radiance. Parameters: [in]  rec  HitRecord for the point asking for a radiance estimate. [in]  context  The standard rendering context. [out]  w_in  The unit length vector to the light. [out]  distance  Distance from the shading point to the light. [out]  radiance  The radiance estimate. Reimplemented from LightShader.

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The documentation for this class was generated from the following files:

• UberLight.h
• UberLight.cc

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