AmbientLightSource Class Reference

Ambient light in a scene. More...

#include <AmbientLightSource.h>

Inheritance diagram for AmbientLightSource:

Public Member Functions
	AmbientLightSource (const Colour &colour)
	AmbientLightSource constructor. More...
	AmbientLightSource (const AmbientLightSource &lightSource)
	AmbientLightSource copy constructor. More...
	~AmbientLightSource ()
	AmbientLightSource destructor. More...
AmbientLightSource &	operator= (const AmbientLightSource &lightSource)
	AmbientLightSource assignment operator. More...
Colour	getIlluminationAt (const Point &point) const
	Determine how much light reaches a Point from this AmbientLightSource. More...
double	getDistanceToLight (const Point &point) const
	Distance factor for shadows from this light source. More...
Direction	getLightDirection (const Point &point) const
	Direction from light source to a point. More...

Additional Inherited Members
Protected Member Functions inherited from LightSource
	LightSource (const Colour &colour)
	LightSource constructor. More...
	LightSource (const LightSource &lightSource)
	LightSource copy constructor. More...
virtual	~LightSource ()
	LightSource destructor. More...
LightSource &	operator= (const LightSource &lightSource)
	LightSource assignment operator. More...
Protected Attributes inherited from LightSource
Colour	colour_
	The Colour of this LightSource's illumination. More...

Detailed Description

Ambient light in a scene.

An AmbientLightSource represents background illumination in a scene. This is essentially a hack to avoid purely black shadows without having to model indirect lighting, which can be expensive.

Constructor & Destructor Documentation

AmbientLightSource() [1/2]

AmbientLightSource::AmbientLightSource

(

const Colour &

colour

)

AmbientLightSource constructor.

Parameters

colour

The Colour of light emitted by the AmbientLightSource.

AmbientLightSource() [2/2]

AmbientLightSource::AmbientLightSource

(

const AmbientLightSource &

lightSource

)

AmbientLightSource copy constructor.

Parameters

lightSource

The AmbientLightSource to copy to this.

~AmbientLightSource()

AmbientLightSource::~AmbientLightSource

(

)

AmbientLightSource destructor.

Member Function Documentation

getDistanceToLight()

double AmbientLightSource::getDistanceToLight ( const Point &  point ) const

virtual

Distance factor for shadows from this light source.

Ambient light sources cast no shadows, so this returns -1 as a flag.

Returns

-1

See also

getDirectionToLight()

Implements LightSource.

getIlluminationAt()

Colour AmbientLightSource::getIlluminationAt ( const Point &  point ) const

virtual

Determine how much light reaches a Point from this AmbientLightSource.

For an AmbientLightSource this is just the Colour of the light.

Parameters

point

The Point at which light is measured.

Returns

The illumination that reaches the Point.

Implements LightSource.

getLightDirection()

Direction AmbientLightSource::getLightDirection ( const Point &  point ) const

virtual

Direction from light source to a point.

Return a Direction pointing from the given point towards the light source. We can return any value for AmbientLightSource, since it will never be used.

Parameters

point

The point where the ray is being computed.

Returns

The Direction from the point towards the light.

See also

getDistanceToLight()

Implements LightSource.

operator=()

AmbientLightSource & AmbientLightSource::operator=

(

const AmbientLightSource &

lightSource

)

AmbientLightSource assignment operator.

Parameters

lightSource

The AmbientLightSource to copy to this.

Returns

A reference to this to allow for chaining of assignment.

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

• AmbientLightSource.h
• AmbientLightSource.cpp