BVH Class Reference

A Bounding Volume Hierarchy for ray tracing acceleration. More...

#include <accels/BVH.h>

Inheritance diagram for BVH:

[legend]List of all members.

Public Member Functions
	BVH (Surface **surfaces, int num_surfaces, int axis=0)
	BVH (Surface *prim1, Surface *prim2, const BBox &_bbox, int axis=0)
	BVH (Surface *prim1, Surface *prim2, int axis=0)
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
Static Public Member Functions
static Surface *	buildBranch (Surface **surfaces, int num_surfaces, int axis=0)

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Detailed Description

A Bounding Volume Hierarchy for ray tracing acceleration.

The BVH is built using slightly modified code from Realistic Ray Tracing, 2nd Edition. A variety of traversals are available by changing the defines at the top of BVH.cc. The ordered traversal seems to perform the best on all inputs.

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Member Function Documentation

bool BVH::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 BVH::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 BVH::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 BVH::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.

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

• BVH.h
• BVH.cc

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