sampleutil

package

v0.0.0-...-ec9fd1c Latest Latest Go to latest Published: Dec 14, 2012 License: GPL-3.0 Imports: 3 Imported by: 0

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Package sampleutil provides useful sampling functions.

func AddMod1(a, b float64) (s float64)
func Cone(d, u, v vec64.Vector, maxCosAngle, s1, s2 float64) vec64.Vector
func CosHemisphere(n, ru, rv vec64.Vector, s1, s2 float64) (v vec64.Vector)
func Sphere(s1, s2 float64) (dir vec64.Vector)
type Pdf1D
- func NewPdf1D(f []float64) (p Pdf1D)

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func AddMod1(a, b float64) (s float64)

AddMod1 performs an floating-point addition modulo 1. Both values must be in the range [0,1].

func Cone(d, u, v vec64.Vector, maxCosAngle, s1, s2 float64) vec64.Vector

Cone uniformly samples a cone.

func CosHemisphere(n, ru, rv vec64.Vector, s1, s2 float64) (v vec64.Vector)

CosHemisphere samples a cosine-weighted hemisphere given the coordinate system built by n, ru, and rv.

func Sphere(s1, s2 float64) (dir vec64.Vector)

Sphere uniformly samples a sphere.

type Pdf1D struct {
	F, Cdf   []float64
	Integral float64
}

Pdf1D stores a 1-dimensonal probability distribution function.

func NewPdf1D(f []float64) (p Pdf1D)

NewPdf1D creates a new probably distribution function and calculates its cumulative distribution function.

func (p Pdf1D) DiscreteSample(u float64) (index int, pdf float64)

func (p Pdf1D) Len() int

func (p Pdf1D) Sample(u float64) (offset, pdf float64)