pt

package
v0.1.0 Latest Latest
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 Go to latest Published: Jan 24, 2023 License: GPL-3.0, MIT Imports: 17 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	ColorChannel = iota
	VarianceChannel
	StandardDeviationChannel
	SamplesChannel
)
View Source 
const (
	LightModeRandom = iota
	LightModeAll
)
View Source 
const (
	SpecularModeNaive = iota
	SpecularModeFirst
	SpecularModeAll
)
View Source 
const (
	BounceTypeAny = iota
	BounceTypeDiffuse
	BounceTypeSpecular
)
View Source 
const EPS = 1e-9
View Source 
const INF = 1e9

Variables

View Source 
var (
	Black = Color{}
	White = Color{1, 1, 1}
)
View Source 
var NoHit = Hit{nil, INF, nil}

Functions

func Clamp 

func Clamp(x, lo, hi float64) float64

func ClampInt 

func ClampInt(x, lo, hi int) int

func Degrees 

func Degrees(radians float64) float64

func Fract 

func Fract(x float64) float64

func LoadImage 

func LoadImage(r io.Reader) (image.Image, error)

func Median 

func Median(items []float64) float64

func ParseFloats 

func ParseFloats(items []string) []float64

func ParseInts 

func ParseInts(items []string) []int

func Radians 

func Radians(degrees float64) float64

func RelativePath 

func RelativePath(path1, path2 string) string

func SavePNG 

func SavePNG(w io.Writer, im image.Image) error

func SaveSTL 

func SaveSTL(path string, mesh *Mesh) error

Types

type Axis 

type Axis uint8
const (
	AxisNone Axis = iota
	AxisX
	AxisY
	AxisZ
)

type BounceType 

type BounceType int

type Box 

type Box struct {
	Min, Max Vector
}

func BoxForShapes 

func BoxForShapes(shapes []Shape) Box

func BoxForTriangles 

func BoxForTriangles(shapes []*Triangle) Box

func (Box) Anchor 

func (a Box) Anchor(anchor Vector) Vector

func (Box) Center 

func (a Box) Center() Vector

func (Box) Contains 

func (a Box) Contains(b Vector) bool

func (Box) Extend 

func (a Box) Extend(b Box) Box

func (Box) InnerRadius 

func (a Box) InnerRadius() float64

func (*Box) Intersect 

func (b *Box) Intersect(r Ray) (float64, float64)

func (Box) Intersects 

func (a Box) Intersects(b Box) bool

func (Box) OuterRadius 

func (a Box) OuterRadius() float64

func (*Box) Partition 

func (b *Box) Partition(axis Axis, point float64) (left, right bool)

func (Box) Size 

func (a Box) Size() Vector

type Buffer 

type Buffer struct {
	W, H   int
	Pixels []Pixel
}

func NewBuffer 

func NewBuffer(w, h int) *Buffer

func (*Buffer) AddSample 

func (b *Buffer) AddSample(x, y int, sample Color)

func (*Buffer) Color 

func (b *Buffer) Color(x, y int) Color

func (*Buffer) Copy 

func (b *Buffer) Copy() *Buffer

func (*Buffer) Image 

func (b *Buffer) Image(channel Channel) image.Image

func (*Buffer) Samples 

func (b *Buffer) Samples(x, y int) int

func (*Buffer) StandardDeviation 

func (b *Buffer) StandardDeviation(x, y int) Color

func (*Buffer) SubImage 

func (b *Buffer) SubImage(x, y, w, h int, channel Channel) image.Image

func (*Buffer) Variance 

func (b *Buffer) Variance(x, y int) Color

type Camera 

type Camera struct {
	// contains filtered or unexported fields
}

func LookAt 

func LookAt(eye, center, up Vector, fovy float64) Camera

func (*Camera) CastRay 

func (c *Camera) CastRay(x, y, w, h int, u, v float64, rnd *rand.Rand) Ray

func (*Camera) SetFocus 

func (c *Camera) SetFocus(focalPoint Vector, apertureRadius float64)

type CapsuleSDF 

type CapsuleSDF struct {
	A, B     Vector
	Radius   float64
	Exponent float64
}

func (*CapsuleSDF) BoundingBox 

func (s *CapsuleSDF) BoundingBox() Box

func (*CapsuleSDF) Evaluate 

func (s *CapsuleSDF) Evaluate(p Vector) float64

type Channel 

type Channel int

type Color 

type Color struct {
	R, G, B float64
}

func HexColor 

func HexColor(x int) Color

func Kelvin 

func Kelvin(K float64) Color

func NewColor 

func NewColor(c color.Color) Color

func (Color) Add 

func (a Color) Add(b Color) Color

func (Color) DivScalar 

func (a Color) DivScalar(b float64) Color

func (Color) Max 

func (a Color) Max(b Color) Color

func (Color) MaxComponent 

func (a Color) MaxComponent() float64

func (Color) Min 

func (a Color) Min(b Color) Color

func (Color) MinComponent 

func (a Color) MinComponent() float64

func (Color) Mix 

func (a Color) Mix(b Color, pct float64) Color

func (Color) Mul 

func (a Color) Mul(b Color) Color

func (Color) MulScalar 

func (a Color) MulScalar(b float64) Color

func (Color) Pow 

func (a Color) Pow(b float64) Color

func (Color) RGBA 

func (a Color) RGBA() color.RGBA

func (Color) RGBA64 

func (a Color) RGBA64() color.RGBA64

func (Color) Sub 

func (a Color) Sub(b Color) Color

type ColorTexture 

type ColorTexture struct {
	Width  int
	Height int
	Data   []Color
}

func (*ColorTexture) BumpSample 

func (t *ColorTexture) BumpSample(u, v float64) Vector

func (*ColorTexture) MulScalar 

func (t *ColorTexture) MulScalar(a float64) Texture

func (*ColorTexture) NormalSample 

func (t *ColorTexture) NormalSample(u, v float64) Vector

func (*ColorTexture) Pow 

func (t *ColorTexture) Pow(a float64) Texture

func (*ColorTexture) Sample 

func (t *ColorTexture) Sample(u, v float64) Color

type Cube 

type Cube struct {
	Min      Vector
	Max      Vector
	Material Material
	Box      Box
}

func NewCube 

func NewCube(min, max Vector, material Material) *Cube

func (*Cube) BoundingBox 

func (c *Cube) BoundingBox() Box

func (*Cube) Compile 

func (c *Cube) Compile()

func (*Cube) Intersect 

func (c *Cube) Intersect(r Ray) Hit

func (*Cube) MaterialAt 

func (c *Cube) MaterialAt(p Vector) Material

func (*Cube) Mesh 

func (c *Cube) Mesh() *Mesh

func (*Cube) NormalAt 

func (c *Cube) NormalAt(p Vector) Vector

func (*Cube) UV 

func (c *Cube) UV(p Vector) Vector

type CubeSDF 

type CubeSDF struct {
	Size Vector
}

func (*CubeSDF) BoundingBox 

func (s *CubeSDF) BoundingBox() Box

func (*CubeSDF) Evaluate 

func (s *CubeSDF) Evaluate(p Vector) float64

type Cylinder 

type Cylinder struct {
	Radius   float64
	Z0, Z1   float64
	Material Material
}

func NewCylinder 

func NewCylinder(radius, z0, z1 float64, material Material) *Cylinder

func (*Cylinder) BoundingBox 

func (c *Cylinder) BoundingBox() Box

func (*Cylinder) Compile 

func (c *Cylinder) Compile()

func (*Cylinder) Intersect 

func (shape *Cylinder) Intersect(ray Ray) Hit

func (*Cylinder) MaterialAt 

func (c *Cylinder) MaterialAt(p Vector) Material

func (*Cylinder) NormalAt 

func (c *Cylinder) NormalAt(p Vector) Vector

func (*Cylinder) UV 

func (c *Cylinder) UV(p Vector) Vector

type CylinderSDF 

type CylinderSDF struct {
	Radius float64
	Height float64
}

func (*CylinderSDF) BoundingBox 

func (s *CylinderSDF) BoundingBox() Box

func (*CylinderSDF) Evaluate 

func (s *CylinderSDF) Evaluate(p Vector) float64

type DefaultSampler 

type DefaultSampler struct {
	FirstHitSamples int
	MaxBounces      int
	DirectLighting  bool
	SoftShadows     bool
	LightMode       LightMode
	SpecularMode    SpecularMode
}

func NewDirectSampler 

func NewDirectSampler() *DefaultSampler

func NewSampler 

func NewSampler(firstHitSamples, maxBounces int) *DefaultSampler

func (*DefaultSampler) Sample 

func (s *DefaultSampler) Sample(scene *Scene, ray Ray, rnd *rand.Rand) Color

type DifferenceSDF 

type DifferenceSDF struct {
	Items []SDF
}

func (*DifferenceSDF) BoundingBox 

func (s *DifferenceSDF) BoundingBox() Box

func (*DifferenceSDF) Evaluate 

func (s *DifferenceSDF) Evaluate(p Vector) float64

type Func 

type Func func(x, y float64) float64

type Function 

type Function struct {
	Function Func
	Box      Box
	Material Material
}

func (*Function) BoundingBox 

func (f *Function) BoundingBox() Box

func (*Function) Compile 

func (f *Function) Compile()

func (*Function) Contains 

func (f *Function) Contains(v Vector) bool

func (*Function) Intersect 

func (f *Function) Intersect(ray Ray) Hit

func (*Function) MaterialAt 

func (f *Function) MaterialAt(p Vector) Material

func (*Function) NormalAt 

func (f *Function) NormalAt(p Vector) Vector

func (*Function) UV 

func (f *Function) UV(p Vector) Vector

type Hit 

type Hit struct {
	Shape   Shape
	T       float64
	HitInfo *HitInfo
}

func (*Hit) Info 

func (hit *Hit) Info(r Ray) HitInfo

func (*Hit) Ok 

func (hit *Hit) Ok() bool

type HitInfo 

type HitInfo struct {
	Shape    Shape
	Position Vector
	Normal   Vector
	Ray      Ray
	Material Material
	Inside   bool
}

type IntersectionSDF 

type IntersectionSDF struct {
	Items []SDF
}

func (*IntersectionSDF) BoundingBox 

func (s *IntersectionSDF) BoundingBox() Box

func (*IntersectionSDF) Evaluate 

func (s *IntersectionSDF) Evaluate(p Vector) float64

type LightMode 

type LightMode int

type Material 

type Material struct {
	Color          Color
	Texture        Texture
	NormalTexture  Texture
	BumpTexture    Texture
	GlossTexture   Texture
	BumpMultiplier float64
	Emittance      float64
	Index          float64 // refractive index
	Gloss          float64 // reflection cone angle in radians
	Tint           float64 // specular and refractive tinting
	Reflectivity   float64 // metallic reflection
	Transparent    bool
}

func ClearMaterial 

func ClearMaterial(index, gloss float64) Material

func DiffuseMaterial 

func DiffuseMaterial(color Color) Material

func GlossyMaterial 

func GlossyMaterial(color Color, index, gloss float64) Material

func LightMaterial 

func LightMaterial(color Color, emittance float64) Material

func MaterialAt 

func MaterialAt(shape Shape, point Vector) Material

func MetallicMaterial 

func MetallicMaterial(color Color, gloss, tint float64) Material

func SpecularMaterial 

func SpecularMaterial(color Color, index float64) Material

func TransparentMaterial 

func TransparentMaterial(color Color, index, gloss, tint float64) Material

type Matrix 

type Matrix struct {
	// contains filtered or unexported fields
}

func Frustum 

func Frustum(l, r, b, t, n, f float64) Matrix

func Identity 

func Identity() Matrix

func LookAtMatrix 

func LookAtMatrix(eye, center, up Vector) Matrix

func Orthographic 

func Orthographic(l, r, b, t, n, f float64) Matrix

func Perspective 

func Perspective(fovy, aspect, near, far float64) Matrix

func Rotate 

func Rotate(v Vector, a float64) Matrix

func Scale 

func Scale(v Vector) Matrix

func Translate 

func Translate(v Vector) Matrix

func (Matrix) Determinant 

func (a Matrix) Determinant() float64

func (Matrix) Frustum 

func (m Matrix) Frustum(l, r, b, t, n, f float64) Matrix

func (Matrix) Inverse 

func (a Matrix) Inverse() Matrix

func (Matrix) Mul 

func (a Matrix) Mul(b Matrix) Matrix

func (Matrix) MulBox 

func (a Matrix) MulBox(box Box) Box

func (Matrix) MulDirection 

func (a Matrix) MulDirection(b Vector) Vector

func (Matrix) MulPosition 

func (a Matrix) MulPosition(b Vector) Vector

func (Matrix) MulRay 

func (a Matrix) MulRay(b Ray) Ray

func (Matrix) Orthographic 

func (m Matrix) Orthographic(l, r, b, t, n, f float64) Matrix

func (Matrix) Perspective 

func (m Matrix) Perspective(fovy, aspect, near, far float64) Matrix

func (Matrix) Rotate 

func (m Matrix) Rotate(v Vector, a float64) Matrix

func (Matrix) Scale 

func (m Matrix) Scale(v Vector) Matrix

func (Matrix) Translate 

func (m Matrix) Translate(v Vector) Matrix

func (Matrix) Transpose 

func (a Matrix) Transpose() Matrix

type Mesh 

type Mesh struct {
	Triangles []*Triangle
	// contains filtered or unexported fields
}

func LoadSTL 

func LoadSTL(path string, material Material) (*Mesh, error)

func NewMesh 

func NewMesh(triangles []*Triangle) *Mesh

func NewSDFMesh 

func NewSDFMesh(sdf SDF, box Box, step float64) *Mesh

func (*Mesh) Add 

func (a *Mesh) Add(b *Mesh)

func (*Mesh) BoundingBox 

func (m *Mesh) BoundingBox() Box

func (*Mesh) Compile 

func (m *Mesh) Compile()

func (*Mesh) Copy 

func (m *Mesh) Copy() *Mesh

func (*Mesh) FitInside 

func (m *Mesh) FitInside(box Box, anchor Vector)

func (*Mesh) Intersect 

func (m *Mesh) Intersect(r Ray) Hit

func (*Mesh) MaterialAt 

func (m *Mesh) MaterialAt(p Vector) Material

func (*Mesh) MoveTo 

func (m *Mesh) MoveTo(position, anchor Vector)

func (*Mesh) NormalAt 

func (m *Mesh) NormalAt(p Vector) Vector

func (*Mesh) SaveSTL 

func (m *Mesh) SaveSTL(path string) error

func (*Mesh) SetMaterial 

func (m *Mesh) SetMaterial(material Material)

func (*Mesh) SmoothNormals 

func (m *Mesh) SmoothNormals()

func (*Mesh) SmoothNormalsThreshold 

func (m *Mesh) SmoothNormalsThreshold(radians float64)

func (*Mesh) Transform 

func (m *Mesh) Transform(matrix Matrix)

func (*Mesh) UV 

func (m *Mesh) UV(p Vector) Vector

func (*Mesh) UnitCube 

func (m *Mesh) UnitCube()

type Node 

type Node struct {
	Axis   Axis
	Point  float64
	Shapes []Shape
	Left   *Node
	Right  *Node
}

func NewNode 

func NewNode(shapes []Shape) *Node

func (*Node) Intersect 

func (node *Node) Intersect(r Ray, tmin, tmax float64) Hit

func (*Node) IntersectShapes 

func (node *Node) IntersectShapes(r Ray) Hit

func (*Node) Partition 

func (node *Node) Partition(size int, axis Axis, point float64) (left, right []Shape)

func (*Node) PartitionScore 

func (node *Node) PartitionScore(axis Axis, point float64) int

func (*Node) Split 

func (node *Node) Split(depth int)

type Pixel 

type Pixel struct {
	Samples int
	M, V    Color
}

func (*Pixel) AddSample 

func (p *Pixel) AddSample(sample Color)

func (*Pixel) Color 

func (p *Pixel) Color() Color

func (*Pixel) StandardDeviation 

func (p *Pixel) StandardDeviation() Color

func (*Pixel) Variance 

func (p *Pixel) Variance() Color

type Plane 

type Plane struct {
	Point    Vector
	Normal   Vector
	Material Material
}

func NewPlane 

func NewPlane(point, normal Vector, material Material) *Plane

func (*Plane) BoundingBox 

func (p *Plane) BoundingBox() Box

func (*Plane) Compile 

func (p *Plane) Compile()

func (*Plane) Intersect 

func (p *Plane) Intersect(ray Ray) Hit

func (*Plane) MaterialAt 

func (p *Plane) MaterialAt(a Vector) Material

func (*Plane) NormalAt 

func (p *Plane) NormalAt(a Vector) Vector

func (*Plane) UV 

func (p *Plane) UV(a Vector) Vector

type Ray 

type Ray struct {
	Origin, Direction Vector
}

func (Ray) Bounce 

func (i Ray) Bounce(info *HitInfo, u, v float64, bounceType BounceType, rnd *rand.Rand) (Ray, bool, float64)

func (Ray) ConeBounce 

func (r Ray) ConeBounce(theta, u, v float64, rnd *rand.Rand) Ray

func (Ray) Position 

func (r Ray) Position(t float64) Vector

func (Ray) Reflect 

func (n Ray) Reflect(i Ray) Ray

func (Ray) Reflectance 

func (n Ray) Reflectance(i Ray, n1, n2 float64) float64

func (Ray) Refract 

func (n Ray) Refract(i Ray, n1, n2 float64) Ray

func (Ray) WeightedBounce 

func (r Ray) WeightedBounce(u, v float64, rnd *rand.Rand) Ray

type Renderer 

type Renderer struct {
	Scene              *Scene
	Camera             *Camera
	Sampler            Sampler
	Buffer             *Buffer
	SamplesPerPixel    int
	StratifiedSampling bool
	AdaptiveSamples    int
	AdaptiveThreshold  float64
	AdaptiveExponent   float64
	FireflySamples     int
	FireflyThreshold   float64
	Area               renderArea
}

func NewRenderer 

func NewRenderer(scene *Scene, camera *Camera, sampler Sampler, w, h int) *Renderer

func (*Renderer) IterativeRender 

func (r *Renderer) IterativeRender(iterations int) image.Image

func (*Renderer) Render 

func (r *Renderer) Render() image.Image

func (*Renderer) SetArea 

func (r *Renderer) SetArea(x, y, w, h int) error

func (*Renderer) TimedRender 

func (r *Renderer) TimedRender(duration time.Duration) image.Image

type RepeatSDF 

type RepeatSDF struct {
	SDF
	Step Vector
}

func (*RepeatSDF) BoundingBox 

func (s *RepeatSDF) BoundingBox() Box

func (*RepeatSDF) Evaluate 

func (s *RepeatSDF) Evaluate(p Vector) float64

type SDF 

type SDF interface {
	Evaluate(p Vector) float64
	BoundingBox() Box
}

func NewCapsuleSDF 

func NewCapsuleSDF(a, b Vector, radius float64) SDF

func NewCubeSDF 

func NewCubeSDF(size Vector) SDF

func NewCylinderSDF 

func NewCylinderSDF(radius, height float64) SDF

func NewDifferenceSDF 

func NewDifferenceSDF(items ...SDF) SDF

func NewIntersectionSDF 

func NewIntersectionSDF(items ...SDF) SDF

func NewRepeatSDF 

func NewRepeatSDF(sdf SDF, step Vector) SDF

func NewScaleSDF 

func NewScaleSDF(sdf SDF, factor float64) SDF

func NewSphereSDF 

func NewSphereSDF(radius float64) SDF

func NewTorusSDF 

func NewTorusSDF(major, minor float64) SDF

func NewTransformSDF 

func NewTransformSDF(sdf SDF, matrix Matrix) SDF

func NewUnionSDF 

func NewUnionSDF(items ...SDF) SDF

type SDFShape 

type SDFShape struct {
	SDF
	Material Material
}

func (*SDFShape) Compile 

func (s *SDFShape) Compile()

func (*SDFShape) Intersect 

func (s *SDFShape) Intersect(ray Ray) Hit

func (*SDFShape) MaterialAt 

func (s *SDFShape) MaterialAt(p Vector) Material

func (*SDFShape) NormalAt 

func (s *SDFShape) NormalAt(p Vector) Vector

func (*SDFShape) UV 

func (s *SDFShape) UV(p Vector) Vector

type STLHeader 

type STLHeader struct {
	Count uint32
	// contains filtered or unexported fields
}

type STLTriangle 

type STLTriangle struct {
	N, V1, V2, V3 [3]float32
	// contains filtered or unexported fields
}

type Sampler 

type Sampler interface {
	Sample(scene *Scene, ray Ray, rnd *rand.Rand) Color
}

type ScaleSDF 

type ScaleSDF struct {
	SDF
	Factor float64
}

func (*ScaleSDF) BoundingBox 

func (s *ScaleSDF) BoundingBox() Box

func (*ScaleSDF) Evaluate 

func (s *ScaleSDF) Evaluate(p Vector) float64

type Scene 

type Scene struct {
	Color        Color
	Texture      Texture
	TextureAngle float64
	Shapes       []Shape
	Lights       []Shape
	// contains filtered or unexported fields
}

func NewScene 

func NewScene() *Scene

func (*Scene) Add 

func (s *Scene) Add(shape Shape)

func (*Scene) Compile 

func (s *Scene) Compile()

func (*Scene) Intersect 

func (s *Scene) Intersect(r Ray) Hit

func (*Scene) RayCount 

func (s *Scene) RayCount() uint64

type Shape 

type Shape interface {
	Compile()
	BoundingBox() Box
	Intersect(Ray) Hit
	UV(Vector) Vector
	NormalAt(Vector) Vector
	MaterialAt(Vector) Material
}

func NewFunction 

func NewFunction(function Func, box Box, material Material) Shape

func NewSDFShape 

func NewSDFShape(sdf SDF, material Material) Shape

func NewSphere 

func NewSphere(center Vector, radius float64, material Material) Shape

func NewSphericalHarmonic 

func NewSphericalHarmonic(l, m int, pm, nm Material) Shape

func NewTransformedCylinder 

func NewTransformedCylinder(v0, v1 Vector, radius float64, material Material) Shape

func NewTransformedShape 

func NewTransformedShape(s Shape, m Matrix) Shape

type SpecularMode 

type SpecularMode int

type Sphere 

type Sphere struct {
	Center   Vector
	Radius   float64
	Material Material
	Box      Box
}

func (*Sphere) BoundingBox 

func (s *Sphere) BoundingBox() Box

func (*Sphere) Compile 

func (s *Sphere) Compile()

func (*Sphere) Intersect 

func (s *Sphere) Intersect(r Ray) Hit

func (*Sphere) MaterialAt 

func (s *Sphere) MaterialAt(p Vector) Material

func (*Sphere) NormalAt 

func (s *Sphere) NormalAt(p Vector) Vector

func (*Sphere) UV 

func (s *Sphere) UV(p Vector) Vector

type SphereSDF 

type SphereSDF struct {
	Radius   float64
	Exponent float64
}

func (*SphereSDF) BoundingBox 

func (s *SphereSDF) BoundingBox() Box

func (*SphereSDF) Evaluate 

func (s *SphereSDF) Evaluate(p Vector) float64

type SphericalHarmonic 

type SphericalHarmonic struct {
	PositiveMaterial Material
	NegativeMaterial Material
	// contains filtered or unexported fields
}

func (*SphericalHarmonic) BoundingBox 

func (s *SphericalHarmonic) BoundingBox() Box

func (*SphericalHarmonic) Compile 

func (s *SphericalHarmonic) Compile()

func (*SphericalHarmonic) Evaluate 

func (s *SphericalHarmonic) Evaluate(p Vector) float64

func (*SphericalHarmonic) EvaluateHarmonic 

func (s *SphericalHarmonic) EvaluateHarmonic(p Vector) float64

func (*SphericalHarmonic) Intersect 

func (s *SphericalHarmonic) Intersect(r Ray) Hit

func (*SphericalHarmonic) MaterialAt 

func (s *SphericalHarmonic) MaterialAt(p Vector) Material

func (*SphericalHarmonic) NormalAt 

func (s *SphericalHarmonic) NormalAt(p Vector) Vector

func (*SphericalHarmonic) UV 

func (s *SphericalHarmonic) UV(p Vector) Vector

type Texture 

type Texture interface {
	Sample(u, v float64) Color
	NormalSample(u, v float64) Vector
	BumpSample(u, v float64) Vector
	Pow(a float64) Texture
	MulScalar(a float64) Texture
}

func GetTexture 

func GetTexture(name string, r io.Reader) Texture

func LoadTexture 

func LoadTexture(r io.Reader) (Texture, error)

func NewTexture 

func NewTexture(im image.Image) Texture

type TorusSDF 

type TorusSDF struct {
	MajorRadius   float64
	MinorRadius   float64
	MajorExponent float64
	MinorExponent float64
}

func (*TorusSDF) BoundingBox 

func (s *TorusSDF) BoundingBox() Box

func (*TorusSDF) Evaluate 

func (s *TorusSDF) Evaluate(p Vector) float64

type TransformSDF 

type TransformSDF struct {
	SDF
	Matrix  Matrix
	Inverse Matrix
}

func (*TransformSDF) BoundingBox 

func (s *TransformSDF) BoundingBox() Box

func (*TransformSDF) Evaluate 

func (s *TransformSDF) Evaluate(p Vector) float64

type TransformedShape 

type TransformedShape struct {
	Shape
	Matrix  Matrix
	Inverse Matrix
}

func (*TransformedShape) BoundingBox 

func (s *TransformedShape) BoundingBox() Box

func (*TransformedShape) Intersect 

func (s *TransformedShape) Intersect(r Ray) Hit

type Tree 

type Tree struct {
	Box  Box
	Root *Node
}

func NewTree 

func NewTree(shapes []Shape) *Tree

func (*Tree) Intersect 

func (tree *Tree) Intersect(r Ray) Hit

type Triangle 

type Triangle struct {
	Material   *Material
	V1, V2, V3 Vector
	N1, N2, N3 Vector
	T1, T2, T3 Vector
}

func NewTriangle 

func NewTriangle(v1, v2, v3, t1, t2, t3 Vector, material Material) *Triangle

func (*Triangle) Area 

func (t *Triangle) Area() float64

func (*Triangle) Barycentric 

func (t *Triangle) Barycentric(p Vector) (u, v, w float64)

func (*Triangle) BoundingBox 

func (t *Triangle) BoundingBox() Box

func (*Triangle) Compile 

func (t *Triangle) Compile()

func (*Triangle) FixNormals 

func (t *Triangle) FixNormals()

func (*Triangle) Intersect 

func (t *Triangle) Intersect(r Ray) Hit

func (*Triangle) MaterialAt 

func (t *Triangle) MaterialAt(p Vector) Material

func (*Triangle) Normal 

func (t *Triangle) Normal() Vector

func (*Triangle) NormalAt 

func (t *Triangle) NormalAt(p Vector) Vector

func (*Triangle) UV 

func (t *Triangle) UV(p Vector) Vector

func (*Triangle) Vertices 

func (t *Triangle) Vertices() (Vector, Vector, Vector)

type UnionSDF 

type UnionSDF struct {
	Items []SDF
}

func (*UnionSDF) BoundingBox 

func (s *UnionSDF) BoundingBox() Box

func (*UnionSDF) Evaluate 

func (s *UnionSDF) Evaluate(p Vector) float64

type Vector 

type Vector struct {
	X, Y, Z float64
}

func Cone 

func Cone(direction Vector, theta, u, v float64, rnd *rand.Rand) Vector

func PoissonDisc 

func PoissonDisc(x1, y1, x2, y2, r float64, n int) []Vector

func RandomUnitVector 

func RandomUnitVector(rnd *rand.Rand) Vector

func V 

func V(x, y, z float64) Vector

func (Vector) Abs 

func (a Vector) Abs() Vector

func (Vector) Add 

func (a Vector) Add(b Vector) Vector

func (Vector) AddScalar 

func (a Vector) AddScalar(b float64) Vector

func (Vector) Cross 

func (a Vector) Cross(b Vector) Vector

func (Vector) Div 

func (a Vector) Div(b Vector) Vector

func (Vector) DivScalar 

func (a Vector) DivScalar(b float64) Vector

func (Vector) Dot 

func (a Vector) Dot(b Vector) float64

func (Vector) Length 

func (a Vector) Length() float64

func (Vector) LengthN 

func (a Vector) LengthN(n float64) float64

func (Vector) Max 

func (a Vector) Max(b Vector) Vector

func (Vector) MaxComponent 

func (a Vector) MaxComponent() float64

func (Vector) Min 

func (a Vector) Min(b Vector) Vector

func (Vector) MinAxis 

func (a Vector) MinAxis() Vector

func (Vector) MinComponent 

func (a Vector) MinComponent() float64

func (Vector) Mod 

func (a Vector) Mod(b Vector) Vector

func (Vector) Mul 

func (a Vector) Mul(b Vector) Vector

func (Vector) MulScalar 

func (a Vector) MulScalar(b float64) Vector

func (Vector) Negate 

func (a Vector) Negate() Vector

func (Vector) Normalize 

func (a Vector) Normalize() Vector

func (Vector) Reflect 

func (n Vector) Reflect(i Vector) Vector

func (Vector) Reflectance 

func (n Vector) Reflectance(i Vector, n1, n2 float64) float64

func (Vector) Refract 

func (n Vector) Refract(i Vector, n1, n2 float64) Vector

func (Vector) String 

func (a Vector) String() string

func (Vector) Sub 

func (a Vector) Sub(b Vector) Vector

func (Vector) SubScalar 

func (a Vector) SubScalar(b float64) Vector

type Volume 

type Volume struct {
	W, H, D int
	ZScale  float64
	Data    []float64
	Windows []VolumeWindow
	Box     Box
}

func NewVolume 

func NewVolume(box Box, images []image.Image, sliceSpacing float64, windows []VolumeWindow) *Volume

func (*Volume) BoundingBox 

func (v *Volume) BoundingBox() Box

func (*Volume) Compile 

func (v *Volume) Compile()

func (*Volume) Get 

func (v *Volume) Get(x, y, z int) float64

func (*Volume) Intersect 

func (v *Volume) Intersect(ray Ray) Hit

func (*Volume) MaterialAt 

func (v *Volume) MaterialAt(p Vector) Material

func (*Volume) NormalAt 

func (v *Volume) NormalAt(p Vector) Vector

func (*Volume) Sample 

func (v *Volume) Sample(x, y, z float64) float64

func (*Volume) Sign 

func (v *Volume) Sign(a Vector) int

func (*Volume) UV 

func (v *Volume) UV(p Vector) Vector

type VolumeWindow 

type VolumeWindow struct {
	Lo, Hi   float64
	Material Material
}

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