Parallelogram Class Reference

A Parellelogram primitive. More...

#include <surfaces/Parallelogram.h>

Inheritance diagram for Parallelogram:

[legend]List of all members.

Public Member Functions
	Parallelogram (const Vector3 &_base, const Vector3 &_u, const Vector3 &_v, SurfaceShader *_sshader)
	Parallelogram (const Vector3 &_base, const Vector3 &_u, const Vector3 &_v, SurfaceShader *_sshader, LightShader *_ls)
	Parallelogram (const Vector3 &_base, const Vector3 &_u, const Vector3 &_v, const Vector2 &_uv0, const Vector2 &_uv1, const Vector2 &_uv2, SurfaceShader *_sshader)
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
bool	randomPoint (Vector3 &on_light, Context &context) const
bool	randomDirection (const HitRecord &rec, Context &context, Vector3 &w_in, double &pdf) const
double	pdfDirection (const Vector3 &w_in, const HitRecord &rec, Context &context) const
Public Attributes
ONB	uvw
	ONB of the parallelogram.
Vector3	unorm
	normalized u offset
Vector3	vnorm
	normalized v offset
double	inverse_area
	1/area for pdf calculations
SurfaceShader *	sshader
LightShader *	ls
One vertex and offsets to neighbors.
Vector3	base
Vector3	u
Vector3	v
Texture coordinates.
Vector2	uv0
Vector2	uv1
Vector2	uv2

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Detailed Description

A Parellelogram primitive.

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Member Function Documentation

bool Parallelogram::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 Parallelogram::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 Parallelogram::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.

bool Parallelogram::overlapsBox (  const BBox &  box  )  const [virtual]

Determine if this surface overlaps the input axis aligned box. Parameters: [in]  box  Bounding box to test against. Returns: False if the surface definitely does not overlap the box. Implements Surface.

bool Parallelogram::randomPoint (  Vector3 &  on_light, Context &  context )  const [virtual]

Randomly sample a point on the surface. Parameters: [out]  on_light  The generated sample point. [in]  context  Contains seeds for sampling. Returns: True if the sample was generated. Reimplemented from Surface.

bool Parallelogram::randomDirection (  const HitRecord &  rec, Context &  context, Vector3 &  w_in, double &  pdf )  const [virtual]

Randomly sample the solid angle subtended by the surface from rec.p. Parameters: [in]  rec  The record of the point being shaded. [in]  context  Contains seeds for sampling. [out]  w_in  The generated sample direction. [out]  pdf  The pdf of the sampled direction. Returns: Returns true if a direction was generated. Reimplemented from Surface.

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

We assume that a point is chosen at random on the parallelogram, so the pdf with area measure is 1/A. For a given point on the parallelogram 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:

• Parallelogram.h
• Parallelogram.cc

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