Triangle Class Reference

A simple Triangle primitive that stores information directly. More...

#include <surfaces/Triangle.h>

Inheritance diagram for Triangle:

[legend]List of all members.

Public Member Functions
	Triangle (const Vector3 &_p0, const Vector3 &_p1, const Vector3 &_p2, SurfaceShader *mat)
	Triangle (const Vector3 &_p0, const Vector3 &_p1, const Vector3 &_p2, const Vector3 &_n0, const Vector3 &_n1, const Vector3 &_n2, SurfaceShader *mat)
	Triangle (const Vector3 &_p0, const Vector3 &_p1, const Vector3 &_p2, const Vector3 &_n0, const Vector3 &_n1, const Vector3 &_n2, const Vector2 &_u0, const Vector2 &_u1, const Vector2 &_u2, SurfaceShader *mat)
bool	hit (Ray &r, HitRecord &rec, Context &context) const
bool	shadowHit (Ray &r, Context &context) const
BBox	boundingBox (double time0, double time1) const
bool	overlapsBox (const BBox &box) const
	Uses Tomas Akenine-Moller's code for Triangle-Box overlap.
double	pdfDirection (const Vector3 &vout, const HitRecord &hrec, Context &context) const
double	area () const
Public Attributes
SurfaceShader *	sshader
Vertices
The vertex positions.
Vector3	p0
Vector3	p1
Vector3	p2
Normals
Per vertex normals.
Vector3	n0
Vector3	n1
Vector3	n2
TextureCoordinates
Per vertex texture coordinates.
Vector2	u0
Vector2	u1
Vector2	u2

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Detailed Description

A simple Triangle primitive that stores information directly.

A Triangle primitive that stores all information (position, normals and texture coordinates) explicitly. Shading information is interpolated according to the barycentric coordinates of the hit location.

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Member Function Documentation

bool Triangle::hit (  Ray &  r, HitRecord &  rec, Context &  context )  const [virtual]

Intersect given ray with the surface. Parameters: [in,out]  r  Ray to be intersected. [in,out]  rec  Struct for passed back shading geometry. [in,out]  context  Rendering context. Returns: Returns true if a new closest intersection has been found. Implements Surface.

bool Triangle::shadowHit (  Ray &  r, Context &  context )  const [virtual]

Intersect without visibility ordering or shading geometry. Parameters: [in,out]  r  Ray to be intersected. [in,out]  context  Rendering context. Returns: Returns true if a valid intersection is found. Reimplemented from Surface.

BBox Triangle::boundingBox (  double  time0, double  time1 )  const [virtual]

Calculate the bounding box of the surface. Parameters: [in]  time0  Minimum of time interval being sampled. [in]  time1  Maximum of time interval being sampled. Returns: The bounding box of the object in the interval [time0, time1). Implements Surface.

double Triangle::pdfDirection (  const Vector3 &  w_in, const HitRecord &  rec, Context &  context )  const [virtual]

We assume that a point is chosen at random on the triangle, so the pdf with area measure is 1/A. For a given point on the triangle with area dA we know . We also know that , so so . Reimplemented from Surface.

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

• Triangle.h
• Triangle.cc

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