Ray Class Reference

A ray characterized by its origin an unit direction vector. More...

#include <ray.h>

Public Member Functions
	Ray ()
	Empty.
	Ray (const Vector &, const Vector &)
	Creates a ray.
	~Ray ()
	Empty.
Ray	Reflect (const Vector &, const Vector &)
	Compute the reflected ray from a ray hitting a surface.
Vector	operator() (const double &) const
	Computes the location of a vertex along the ray.
double	Length () const
	Gets the length of the direction vector.
double	LengthSquared () const
	Gets the squared length of the direction vector.
Ray	Scaled (const Vector &) const
	Scale the ray.
Ray	Translated (const Vector &) const
	Translate the ray.
Ray	Rotated (const Matrix &) const
	Rotate the ray.
Ray	InverseTransform (const Frame &) const
	Transform a ray.
Vector	Origin () const
	Return the origin of the ray.
Vector	Direction () const
	Return the direction of the ray.

Protected Attributes
Vector	c = Vector::Null
	Origin of the ray.
Vector	n = Vector::Z
	Direction.

Friends
std::ostream &	operator<< (std::ostream &s, const Ray &ray)
	Overloaded.

Detailed Description

A ray characterized by its origin an unit direction vector.

This class should be used in ray-object intersection methods and for ray-tracing.

Constructor & Destructor Documentation

Ray()

Ray::Ray ( const Vector & p, const Vector & d )

inlineexplicit

Creates a ray.

The direction should be unit:

Ray ray(Vector(0.0,0.0,0.0),Normalized(Vector(2.0,-1.0,3.0)));

Parameters

p	Origin.
d	Direction (should be unit vector).

Member Function Documentation

InverseTransform()

Ray Ray::InverseTransform

(

const Frame &

frame

)

const

Transform a ray.

Parameters

frame

The frame.

operator()()

Vector Ray::operator() ( const double & t ) const

inline

Computes the location of a vertex along the ray.

Parameters

t	Parameter.

Reflect()

Ray Ray::Reflect	(	const Vector &	p,
		const Vector &	normal )

Compute the reflected ray from a ray hitting a surface.

The origin of the ray is defined as the argument intersection point, and direction is set according to the normal of the surface at intersection point.

Parameters

p	Intersection point.
normal	Surface outgoing normal.

Rotated()

Ray Ray::Rotated

(

const Matrix &

r

)

const

Rotate the ray.

Parameters

r	Rotation matrix.

Scaled()

Ray Ray::Scaled

(

const Vector &

s

)

const

Scale the ray.

This function changes both the direction vector and origin. Note that the direction is kept unit.

Parameters

s	Scaling vector.

Translated()

Ray Ray::Translated

(

const Vector &

t

)

const

Translate the ray.

Parameters

t	Translation vector.

Friends And Related Symbol Documentation

operator<<

std::ostream & operator<< ( std::ostream & s, const Ray & ray )

friend

Overloaded.

Parameters

s	Stream.
ray	The ray.