ShadowSpot Class Reference

a shadow casting spotlight More...

#include <ShadowSpot.h>

Inheritance diagram for ShadowSpot:

Collaboration diagram for ShadowSpot:

List of all members.

Public Member Functions
	ShadowSpot (const ngl::Vector &_position, const ngl::Vector &_target, const float &_distance, const float &_angle, const ngl::Vector &_col, const ngl::Vector &_up)
	ShadowSpot ()
	~ShadowSpot ()
	dtor
unsigned int	getMapId ()
	access the shadowmap id
void	generateProjMatrices ()
	construct the projection, inversprojection and projView matrices for this shadowspot
Frustum	getFrustum ()
	return the lights frustum
const ngl::Matrix	getProjView ()
	return the light projview
const ngl::Matrix	getProj ()
	return the light projection matrix
const ngl::Matrix	getInverseProjView ()
	return the inverse projview
Public Attributes
ngl::Matrix	m_shadowView
	the shadowview matrix for shadow pass
unsigned int	m_mapHandle
	shadowmap handle
Private Attributes
Frustum	m_frustum
	the lights frustum
float	m_angle
	the lights cone angle
ngl::Matrix	m_proj
	the lights proj matrix
ngl::Matrix	m_projView
	the lights projview matrix
ngl::Matrix	m_invProjView
	the lights inverse projview matrix

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Detailed Description

a shadow casting spotlight

Definition at line 14 of file ShadowSpot.h.

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Constructor & Destructor Documentation

ShadowSpot::ShadowSpot	(	const ngl::Vector &	_position,
		const ngl::Vector &	_target,
		const float &	_distance,
		const float &	_angle,
		const ngl::Vector &	_col,
		const ngl::Vector &	_up
	)

Parameters:

[in]	_position	the light pos
[in]	_target	the light lookat pos
[in]	_distance	the reach of the light
[in]	_angle	the cone angle
[in]	_col	the light colour
[in]	_up	the apporximated up vector

Definition at line 8 of file ShadowSpot.cpp.

References generateProjMatrices(), m_angle, SpotLight::m_matrixCam, and m_shadowView.

{
    //m_shadowMapId = 0;
    this->set(_position,_target,_distance,_angle,_col,_up);
    m_shadowView = m_matrixCam.getModelView();//Lookat(_position, _target, _up, true);
    m_angle = _angle;

    generateProjMatrices();
}

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ShadowSpot::ShadowSpot

(

)

ShadowSpot::~ShadowSpot

(

)

[inline]

dtor

Definition at line 29 of file ShadowSpot.h.

{}

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Member Function Documentation

void ShadowSpot::generateProjMatrices

(

)

construct the projection, inversprojection and projView matrices for this shadowspot

Based on Jon Maceys code (2011)

Definition at line 25 of file ShadowSpot.cpp.

References Frustum::generate(), m_angle, m_frustum, SpotLight::m_lightView, m_proj, and m_projView.

{
    float aspectRatio = float(1024/768);

    float near = 0.1;
    float far = 300.0;

    // note 1/tan == cotangent
    float f= 1.0/tan(ngl::radians(m_angle)/2.0);

    m_proj.identity();

    m_proj.m_m[0][0]=f/aspectRatio;
    m_proj.m_m[1][1]=f;

    m_proj.m_m[2][2]=(far+near)/(near-far);
    m_proj.m_m[3][2]=(2*far*near)/(near-far);

    m_proj.m_m[2][3]=-1;

    m_projView = m_proj * m_lightView;
    m_frustum.generate(m_projView);
}

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Frustum ShadowSpot::getFrustum

(

)

[inline]

return the lights frustum

Definition at line 38 of file ShadowSpot.h.

References m_frustum.

{return m_frustum;}const

const ngl::Matrix ShadowSpot::getInverseProjView

(

)

[inline]

return the inverse projview

Definition at line 47 of file ShadowSpot.h.

References m_invProjView.

{return m_invProjView;}

unsigned int ShadowSpot::getMapId

(

)

[inline]

access the shadowmap id

Definition at line 32 of file ShadowSpot.h.

References m_mapHandle.

{return m_mapHandle;}

const ngl::Matrix ShadowSpot::getProj

(

)

[inline]

return the light projection matrix

Definition at line 44 of file ShadowSpot.h.

References m_proj.

{return m_proj;}const

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const ngl::Matrix ShadowSpot::getProjView

(

)

[inline]

return the light projview

Definition at line 41 of file ShadowSpot.h.

References m_projView.

{return m_projView;}const

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Member Data Documentation

float ShadowSpot::m_angle [private]

the lights cone angle

Definition at line 60 of file ShadowSpot.h.

Frustum ShadowSpot::m_frustum [private]

the lights frustum

Definition at line 57 of file ShadowSpot.h.

ngl::Matrix ShadowSpot::m_invProjView [private]

the lights inverse projview matrix

Definition at line 69 of file ShadowSpot.h.

unsigned int ShadowSpot::m_mapHandle

shadowmap handle

Definition at line 53 of file ShadowSpot.h.

ngl::Matrix ShadowSpot::m_proj [private]

the lights proj matrix

Definition at line 63 of file ShadowSpot.h.

ngl::Matrix ShadowSpot::m_projView [private]

the lights projview matrix

Definition at line 66 of file ShadowSpot.h.

ngl::Matrix ShadowSpot::m_shadowView

the shadowview matrix for shadow pass

Definition at line 50 of file ShadowSpot.h.

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

• ShadowSpot.h
• ShadowSpot.cpp