montecarlo.h File Reference

#include "pbrt.h"
#include "geometry.h"
#include "rng.h"

Classes
struct	Distribution1D
struct	Distribution2D
class	PermutedHalton
Functions
void	RejectionSampleDisk (float u1, float u2, float x, float y)
Vector	UniformSampleHemisphere (float u1, float u2)
float	UniformHemispherePdf ()
Vector	UniformSampleSphere (float u1, float u2)
float	UniformSpherePdf ()
Vector	UniformSampleCone (float u1, float u2, float thetamax)
Vector	UniformSampleCone (float u1, float u2, float thetamax, const Vector &x, const Vector &y, const Vector &z)
float	UniformConePdf (float thetamax)
void	UniformSampleDisk (float u1, float u2, float x, float y)
void	ConcentricSampleDisk (float u1, float u2, float dx, float dy)
Vector	CosineSampleHemisphere (float u1, float u2)
float	CosineHemispherePdf (float costheta, float phi)
void	UniformSampleTriangle (float ud1, float ud2, float u, float v)
void	StratifiedSample1D (float *samples, int nsamples, RNG &rng, bool jitter=true)
void	StratifiedSample2D (float *samples, int nx, int ny, RNG &rng, bool jitter=true)
template<typename T >
void	Shuffle (T *samp, uint32_t count, uint32_t dims, RNG &rng)
void	LatinHypercube (float *samples, uint32_t nSamples, uint32_t nDim, RNG &rng)
double	RadicalInverse (int n, int base)
void	GeneratePermutation (uint32_t *buf, uint32_t b, RNG &rng)
double	PermutedRadicalInverse (uint32_t n, uint32_t base, const uint32_t *p)
float	VanDerCorput (uint32_t n, uint32_t scramble=0)
float	Sobol2 (uint32_t n, uint32_t scramble=0)
float	LarcherPillichshammer2 (uint32_t n, uint32_t scramble=0)
void	Sample02 (uint32_t n, const uint32_t scramble[2], float sample[2])
int	LDPixelSampleFloatsNeeded (const Sample *sample, int nPixelSamples)
void	LDPixelSample (int xPos, int yPos, float shutterOpen, float shutterClose, int nPixelSamples, Sample samples, float buf, RNG &rng)
Vector	SampleHG (const Vector &w, float g, float u1, float u2)
float	HGPdf (const Vector &w, const Vector &wp, float g)
float	BalanceHeuristic (int nf, float fPdf, int ng, float gPdf)
float	PowerHeuristic (int nf, float fPdf, int ng, float gPdf)
void	LDShuffleScrambled1D (int nSamples, int nPixel, float *samples, RNG &rng)
void	LDShuffleScrambled2D (int nSamples, int nPixel, float *samples, RNG &rng)
Variables
static const float	OneMinusEpsilon = 0x1.fffffep-1

Function Documentation

float BalanceHeuristic	(	int	nf,
		float	fPdf,
		int	ng,
		float	gPdf
	)			`[inline]`

Definition at line 243 of file montecarlo.h.

void ConcentricSampleDisk	(	float	u1,
		float	u2,
		float *	dx,
		float *	dy
	)

Definition at line 298 of file montecarlo.cpp.

References M_PI.

Referenced by CosineSampleHemisphere(), PerspectiveCamera::GenerateRay(), OrthoCamera::GenerateRay(), PerspectiveCamera::GenerateRayDifferential(), OrthoCamera::GenerateRayDifferential(), Disk::Sample(), InfiniteAreaLight::Sample_L(), and DistantLight::Sample_L().

float CosineHemispherePdf	(	float	costheta,
		float	phi
	)			`[inline]`

Definition at line 122 of file montecarlo.h.

References INV_PI.

Referenced by Gen_CosHemisphere().

Vector CosineSampleHemisphere	(	float	u1,
		float	u2
	)			`[inline]`

Definition at line 114 of file montecarlo.h.

References ConcentricSampleDisk(), Vector::x, Vector::y, and Vector::z.

Referenced by Gen_CosHemisphere(), IrradianceCacheIntegrator::indirectLo(), FresnelBlend::Sample_f(), and BxDF::Sample_f().

void GeneratePermutation	(	uint32_t *	buf,
		uint32_t	b,
		RNG &	rng
	)			`[inline]`

Definition at line 185 of file montecarlo.h.

References Shuffle().

Referenced by PermutedHalton::PermutedHalton().

float HGPdf	(	const Vector &	w,
		const Vector &	wp,
		float	g
	)

Definition at line 432 of file montecarlo.cpp.

References PhaseHG().

float LarcherPillichshammer2	(	uint32_t	n,
		uint32_t	scramble = `0`
	)			`[inline]`

Definition at line 283 of file montecarlo.h.

References OneMinusEpsilon.

void LatinHypercube	(	float *	samples,
		uint32_t	nSamples,
		uint32_t	nDim,
		RNG &	rng
	)

Definition at line 163 of file montecarlo.cpp.

References OneMinusEpsilon, RNG::RandomFloat(), and RNG::RandomUInt().

Referenced by StratifiedSampler::GetMoreSamples(), and HaltonSampler::GetMoreSamples().

void LDPixelSample	(	int	xPos,
		int	yPos,
		float	shutterOpen,
		float	shutterClose,
		int	nPixelSamples,
		Sample *	samples,
		float *	buf,
		RNG &	rng
	)

Definition at line 192 of file montecarlo.cpp.

References ALLOCA, CameraSample::imageX, CameraSample::imageY, LDShuffleScrambled1D(), LDShuffleScrambled2D(), CameraSample::lensU, CameraSample::lensV, Lerp(), Sample::n1D, Sample::n2D, and CameraSample::time.

Referenced by LDSampler::GetMoreSamples(), and AdaptiveSampler::GetMoreSamples().

int LDPixelSampleFloatsNeeded	(	const Sample *	sample,
		int	nPixelSamples
	)

Definition at line 182 of file montecarlo.cpp.

References Sample::n1D, and Sample::n2D.

Referenced by LDSampler::GetMoreSamples(), and AdaptiveSampler::GetMoreSamples().

void LDShuffleScrambled1D	(	int	nSamples,
		int	nPixel,
		float *	samples,
		RNG &	rng
	)			`[inline]`

Definition at line 290 of file montecarlo.h.

References RNG::RandomUInt(), Shuffle(), and VanDerCorput().

Referenced by BestCandidateSampler::GetMoreSamples(), LDPixelSample(), SingleScatteringIntegrator::Li(), and IGIIntegrator::Preprocess().

void LDShuffleScrambled2D	(	int	nSamples,
		int	nPixel,
		float *	samples,
		RNG &	rng
	)			`[inline]`

Definition at line 301 of file montecarlo.h.

References RNG::RandomUInt(), Sample02(), and Shuffle().

Referenced by BestCandidateSampler::GetMoreSamples(), LDPixelSample(), SingleScatteringIntegrator::Li(), and IGIIntegrator::Preprocess().

double PermutedRadicalInverse	(	uint32_t	n,
		uint32_t	base,
		const uint32_t *	p
	)			`[inline]`

Definition at line 192 of file montecarlo.h.

Referenced by PermutedHalton::Sample().

float PowerHeuristic	(	int	nf,
		float	fPdf,
		int	ng,
		float	gPdf
	)			`[inline]`

Definition at line 248 of file montecarlo.h.

Referenced by EstimateDirect(), and PhotonIntegrator::Li().

double RadicalInverse	(	int	n,
		int	base
	)			`[inline]`

Definition at line 171 of file montecarlo.h.

Referenced by HaltonSampler::GetMoreSamples(), and CreateRadProbeTask::Run().

void RejectionSampleDisk	(	float	u1,
		float	u2,
		float *	x,
		float *	y
	)

void Sample02	(	uint32_t	n,
		const uint32_t	scramble[2],
		float	sample[2]
	)			`[inline]`

Definition at line 256 of file montecarlo.h.

References Sobol2(), and VanDerCorput().

Referenced by IrradianceCacheIntegrator::indirectLo(), LDShuffleScrambled2D(), AmbientOcclusionIntegrator::Li(), DipoleSubsurfaceIntegrator::Preprocess(), MetropolisRenderer::Render(), SHComputeBSDFMatrix(), SHComputeDiffuseTransfer(), SHComputeTransferMatrix(), Light::SHProject(), and SHProjectIncidentIndirectRadiance().

Vector SampleHG	(	const Vector &	w,
		float	g,
		float	u1,
		float	u2
	)

Definition at line 415 of file montecarlo.cpp.

References CoordinateSystem(), M_PI, and SphericalDirection().

template<typename T >

void Shuffle	(	T *	samp,
		uint32_t	count,
		uint32_t	dims,
		RNG &	rng
	)			`[inline]`

Definition at line 161 of file montecarlo.h.

References RNG::RandomUInt().

Referenced by GeneratePermutation(), StratifiedSampler::GetMoreSamples(), LDShuffleScrambled1D(), LDShuffleScrambled2D(), and MLTTask::Run().

float Sobol2	(	uint32_t	n,
		uint32_t	scramble = `0`
	)			`[inline]`

Definition at line 275 of file montecarlo.h.

References OneMinusEpsilon.

Referenced by Sample02().

void StratifiedSample1D	(	float *	samples,
		int	nsamples,
		RNG &	rng,
		bool	jitter = `true`
	)

Definition at line 140 of file montecarlo.cpp.

References OneMinusEpsilon, and RNG::RandomFloat().

Referenced by StratifiedSampler::GetMoreSamples().

void StratifiedSample2D	(	float *	samples,
		int	nx,
		int	ny,
		RNG &	rng,
		bool	jitter = `true`
	)

Definition at line 150 of file montecarlo.cpp.

References OneMinusEpsilon, and RNG::RandomFloat().

Referenced by StratifiedSampler::GetMoreSamples(), and BSDF::rho().

float UniformConePdf ( float thetamax )

Definition at line 392 of file montecarlo.cpp.

References M_PI.

Referenced by PhotonIntegrator::Li(), Sphere::Pdf(), SpotLight::Sample_L(), and ProjectionLight::Sample_L().

float UniformHemispherePdf ( )

Definition at line 270 of file montecarlo.cpp.

References INV_TWOPI.

Referenced by Gen_UniformHemisphere().

Vector UniformSampleCone	(	float	u1,
		float	u2,
		float	thetamax,
		const Vector &	x,
		const Vector &	y,
		const Vector &	z
	)

Definition at line 405 of file montecarlo.cpp.

References Lerp(), and M_PI.

Vector UniformSampleCone	(	float	u1,
		float	u2,
		float	thetamax
	)

Definition at line 397 of file montecarlo.cpp.

References M_PI.

Referenced by PhotonIntegrator::Li(), Sphere::Sample(), SpotLight::Sample_L(), and ProjectionLight::Sample_L().

void UniformSampleDisk	(	float	u1,
		float	u2,
		float *	x,
		float *	y
	)

Definition at line 290 of file montecarlo.cpp.

References M_PI.

Vector UniformSampleHemisphere	(	float	u1,
		float	u2
	)

Definition at line 260 of file montecarlo.cpp.

References M_PI.

Referenced by Gen_UniformHemisphere(), and BxDF::rho().

Vector UniformSampleSphere	(	float	u1,
		float	u2
	)

Definition at line 275 of file montecarlo.cpp.

References M_PI.

Referenced by AmbientOcclusionIntegrator::Li(), CreateRadianceProbes::Render(), AggregateTest::Render(), SurfacePointTask::Run(), Sphere::Sample(), PointLight::Sample_L(), GonioPhotometricLight::Sample_L(), DiffuseAreaLight::Sample_L(), SHComputeBSDFMatrix(), SHComputeDiffuseTransfer(), SHComputeTransferMatrix(), and SHProjectIncidentIndirectRadiance().

void UniformSampleTriangle	(	float	ud1,
		float	ud2,
		float *	u,
		float *	v
	)

Definition at line 343 of file montecarlo.cpp.

Referenced by Triangle::Sample().

float UniformSpherePdf ( )

Definition at line 285 of file montecarlo.cpp.

References M_PI.

Referenced by PointLight::Sample_L(), GonioPhotometricLight::Sample_L(), SHComputeBSDFMatrix(), SHComputeDiffuseTransfer(), SHComputeTransferMatrix(), and SHProjectIncidentIndirectRadiance().

float VanDerCorput	(	uint32_t	n,
		uint32_t	scramble = `0`
	)			`[inline]`

Definition at line 263 of file montecarlo.h.

References OneMinusEpsilon.

Referenced by LDShuffleScrambled1D(), DipoleSubsurfaceIntegrator::Preprocess(), Sample02(), and Light::SHProject().

Variable Documentation

const float OneMinusEpsilon = 0x1.fffffep-1 [static]

Definition at line 42 of file montecarlo.h.

Referenced by LarcherPillichshammer2(), LatinHypercube(), PermutedHalton::Sample(), Sobol2(), StratifiedSample1D(), StratifiedSample2D(), and VanDerCorput().

montecarlo.h File Reference

Classes

Functions

Variables

Function Documentation

Variable Documentation