rt::PointLight Struct Reference

#include <PointLight.h>

Inheritance diagram for rt::PointLight:

Public Member Functions
	PointLight (GLenum light_number, Point4 pos, Color emission_color, Color ambient_color=Color(0.0, 0.0, 0.0), Color diffuse_color=Color(1.0, 1.0, 1.0), Color specular_color=Color(1.0, 1.0, 1.0))
	~PointLight ()
	Destructor.
void	init (Viewer &viewer)
void	light (Viewer &)
void	draw (Viewer &viewer)
Vector3	direction (const Vector3 &p) const
	Given the point p, returns the normalized direction to this light.
Color	color (const Vector3 &) const
Public Member Functions inherited from rt::Light
	Light ()
	Default constructor. Nothing to do.
virtual	~Light ()
	Virtual destructor since object contains virtual methods.

Public Attributes
GLenum	number
	Specifies which OpenGL light it is (necessary for draw())
Point4	position
	The position of the light in homogeneous coordinates.
Color	emission
	The emission color of the light.
Material	material
	The material (global to the light).
qglviewer::ManipulatedFrame *	manipulator
	Used to store a manipulator to move the light in space.

Detailed Description

This structure defines a point light, which may be at an infinite distance. Such light does not suffer from any attenuation. One can also draw it in order to be displayed and manipulated.

Definition at line 19 of file PointLight.h.

Constructor & Destructor Documentation

PointLight()

rt::PointLight::PointLight ( GLenum  light_number, Point4  pos, Color  emission_color, Color  ambient_color = Color( 0.0, 0.0, 0.0 ), Color  diffuse_color = Color( 1.0, 1.0, 1.0 ), Color  specular_color = Color( 1.0, 1.0, 1.0 )  )

inline

Constructor. light_number must be different for every light (GL_LIGHT0, GL_LIGHT1, etc).

Definition at line 33 of file PointLight.h.

      : number( light_number ), position( pos ), emission( emission_color ),
        material( ambient_color, diffuse_color, specular_color ),
        manipulator( 0 )
    {}

~PointLight()

rt::PointLight::~PointLight ( )

inline

Destructor.

Definition at line 45 of file PointLight.h.

    {
      if ( manipulator != 0 ) delete manipulator;
    }

Member Function Documentation

color()

Color rt::PointLight::color ( const Vector3 &  ) const

inlinevirtual

Returns

the color of this light viewed from the given point p.

Implements rt::Light.

Definition at line 110 of file PointLight.h.

    {
      return emission;
    }

direction()

Vector3 rt::PointLight::direction ( const Vector3 &  p ) const

inlinevirtual

Given the point p, returns the normalized direction to this light.

Implements rt::Light.

Definition at line 100 of file PointLight.h.

    {
      Vector3 pos( position.data() );
      if ( position[ 3 ] == 0.0 ) return pos / pos.norm() ;
      pos /= position[ 3 ];
      pos -= p;
      return pos / pos.norm();
    }

draw()

void rt::PointLight::draw ( Viewer &  viewer )

inlinevirtual

This method is called by Scene::draw() at each frame to redisplay objects in the OpenGL window.

Implements rt::Light.

Definition at line 91 of file PointLight.h.

    {
      if ( manipulator != 0 && manipulator->grabsMouse() )
        viewer.drawSomeLight( number, 1.2f );
      else
    viewer.drawSomeLight( number );
    }

init()

void rt::PointLight::init ( Viewer &  viewer )

inlinevirtual

This method is called by Scene::init() at the beginning of the display in the OpenGL window.

Implements rt::Light.

Definition at line 52 of file PointLight.h.

    {
      glMatrixMode(GL_MODELVIEW);
      glLoadIdentity();
      glEnable( number );
      glLightfv( number, GL_AMBIENT,  material.ambient );
      glLightfv( number, GL_DIFFUSE,  material.diffuse );
      glLightfv( number, GL_SPECULAR, material.specular );
      std::cout << "Init  light at " << position << std::endl;
      if ( position[ 3 ] != 0.0 ) // the point light is not at infinity
        {
          std::cout << "Init manipulator for light at " << position << std::endl;
          manipulator = new qglviewer::ManipulatedFrame;
          viewer.setMouseTracking( true );
          manipulator->setPosition( position[ 0 ] / position[ 3 ], 
                                    position[ 1 ] / position[ 3 ], 
                                    position[ 2 ] / position[ 3 ] );
        }
    }

light()

void rt::PointLight::light ( Viewer &  )

inlinevirtual

This method is called by Scene::light() at each frame to set the lights in the OpenGL window.

Implements rt::Light.

Definition at line 74 of file PointLight.h.

    {
      Point4 pos = position;
      if ( manipulator != 0 )
        {
          qglviewer::Vec pos2 = manipulator->position();
          pos[0] = float(pos2.x);
          pos[1] = float(pos2.y);
          pos[2] = float(pos2.z);
          pos[3] = 1.0f;
          position = pos;
        }
      glLightfv( number, GL_POSITION, pos);
    }

Member Data Documentation

emission

Color rt::PointLight::emission

The emission color of the light.

Definition at line 25 of file PointLight.h.

manipulator

qglviewer::ManipulatedFrame* rt::PointLight::manipulator

Used to store a manipulator to move the light in space.

Definition at line 29 of file PointLight.h.

material

Material rt::PointLight::material

The material (global to the light).

Definition at line 27 of file PointLight.h.

number

GLenum rt::PointLight::number

Specifies which OpenGL light it is (necessary for draw())

Definition at line 21 of file PointLight.h.

position

Point4 rt::PointLight::position

The position of the light in homogeneous coordinates.

Definition at line 23 of file PointLight.h.

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The documentation for this struct was generated from the following file:

• TP2/PointLight.h