├── .idea
├── .gitignore
├── misc.xml
├── vcs.xml
├── modules.xml
├── go-raytracer.iml
└── watcherTasks.xml
├── go.mod
├── images
└── screenshot.png
├── README.md
├── .gitignore
├── vec
├── ray.go
├── camera.go
└── vec.go
├── util
└── rtweekend.go
├── hittable
├── sphere.go
├── hittable.go
└── material.go
├── main.go
└── LICENSE
/.idea/.gitignore:
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1 | # Default ignored files
2 | /workspace.xml
3 |
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/go.mod:
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1 | module github.com/razodactyl/go-raytracer
2 |
3 | go 1.13
4 |
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/images/screenshot.png:
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https://raw.githubusercontent.com/razodactyl/go-raytracer/HEAD/images/screenshot.png
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/README.md:
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1 | # Go Ray Tracer
2 | Ray tracing tutorial written so I could learn Golang.
3 |
4 | See: https://raytracing.github.io/
5 |
6 | 
7 |
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/.idea/misc.xml:
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/.idea/vcs.xml:
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/.idea/modules.xml:
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/.idea/go-raytracer.iml:
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/.gitignore:
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1 | # Binaries for programs and plugins
2 | *.exe
3 | *.exe~
4 | *.dll
5 | *.so
6 | *.dylib
7 |
8 | # Test binary, built with `go test -c`
9 | *.test
10 |
11 | # Output of the go coverage tool, specifically when used with LiteIDE
12 | *.out
13 |
14 | # Dependency directories (remove the comment below to include it)
15 | # vendor/
16 | *.ppm
17 | .DS_Store
18 |
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/vec/ray.go:
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1 | package vec
2 |
3 | type Ray3D struct {
4 | Origin Vector3D
5 | Direction Vector3D
6 | }
7 |
8 | func NewRay3D(origin, direction Vector3D) Ray3D {
9 | return Ray3D{origin, direction}
10 | }
11 |
12 | func (r Ray3D) At(t float64) Vector3D {
13 | return r.Origin.Add(r.Direction.MultiplyScalar(t))
14 | }
15 |
16 | func (r Ray3D) Color() Vector3D {
17 | unit_direction := r.Direction.Unit()
18 | t := 0.5 * (unit_direction.Y + 1.0)
19 | return Unit().MultiplyScalar((1.0 - t)).Add(NewVector3D(0.5, 0.7, 1.0).MultiplyScalar(t))
20 | }
21 |
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/util/rtweekend.go:
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1 | package util
2 |
3 | import (
4 | "math/rand"
5 | )
6 |
7 | // Constants
8 | const pi float64 = 3.1415926535897932385
9 |
10 | // Utility Functions
11 | func DegreesToRadians(degrees float64) float64 {
12 | return degrees * pi / 180
13 | }
14 |
15 | func FFMin(a float64, b float64) float64 { if a <= b { return a } else { return b } }
16 | func FFMax(a float64, b float64) float64 { if a >= b { return a } else { return b } }
17 |
18 | func Clamp(x float64, min float64, max float64) float64 {
19 | if x < min { return min }
20 | if x > max { return max }
21 | return x
22 | }
23 |
24 | func Random() float64 {
25 | // Returns a random float64 in [0, 1).
26 | return rand.Float64()
27 | }
28 |
29 | func RandomBetween(min float64, max float64) float64 {
30 | // Returns a random float64 in [min, max).
31 | return min + (max-min)*Random()
32 | }
33 |
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/hittable/sphere.go:
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1 | package hittable
2 |
3 | import (
4 | "github.com/razodactyl/go-raytracer/vec"
5 | "math"
6 | )
7 |
8 | type Sphere struct {
9 | center vec.Vector3D
10 | radius float64
11 | mat Material
12 | }
13 |
14 | func NewSphere(center vec.Vector3D, radius float64, mat Material) *Sphere {
15 | return &Sphere{center: center, radius: radius, mat: mat}
16 | }
17 |
18 | func (s Sphere) Hit(r vec.Ray3D, tMin float64, tMax float64, rec *HitRecord) bool {
19 | oc := r.Origin.Subtract(s.center)
20 | a := r.Direction.LengthSquared()
21 | halfB := oc.Dot(r.Direction)
22 | c := oc.LengthSquared() - s.radius*s.radius
23 | discriminant := halfB*halfB - a*c
24 |
25 | if discriminant > 0 {
26 | root := float64(math.Sqrt(float64(discriminant)))
27 | temp := (-halfB - root) / a
28 | if temp < tMax && temp > tMin {
29 | rec.t = temp
30 | rec.P = r.At(rec.t)
31 | outwardNormal := (rec.P.Subtract(s.center)).DivideScalar(s.radius)
32 | rec.setFaceNormal(r, outwardNormal)
33 | rec.Mat = s.mat
34 | return true
35 | }
36 | temp = (-halfB + root) / a
37 | if temp < tMax && temp > tMin {
38 | rec.t = temp
39 | rec.P = r.At(rec.t)
40 | outwardNormal := (rec.P.Subtract(s.center)).DivideScalar(s.radius)
41 | rec.setFaceNormal(r, outwardNormal)
42 | rec.Mat = s.mat
43 | return true
44 | }
45 | }
46 | return false
47 | }
48 |
--------------------------------------------------------------------------------
/hittable/hittable.go:
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1 | package hittable
2 |
3 | import (
4 | "github.com/razodactyl/go-raytracer/vec"
5 | )
6 |
7 | type HitRecord struct {
8 | P vec.Vector3D
9 | Normal vec.Vector3D
10 | Mat Material
11 | t float64
12 | frontFace bool
13 | }
14 |
15 | func (h *HitRecord) setFaceNormal(r vec.Ray3D, outwardNormal vec.Vector3D) {
16 | h.frontFace = r.Direction.Dot(outwardNormal) < 0
17 | if h.frontFace {
18 | h.Normal = outwardNormal
19 | } else {
20 | h.Normal = outwardNormal.MultiplyScalar(-1)
21 | }
22 | }
23 |
24 | type Hittable interface {
25 | Hit(r vec.Ray3D, tMin float64, tMax float64, rec *HitRecord) bool
26 | }
27 |
28 | type HitObjectList struct {
29 | Objects []Hittable
30 | }
31 |
32 | func NewHitObjectList() *HitObjectList {
33 | return &HitObjectList{}
34 | }
35 |
36 | func (l HitObjectList) Clear() {
37 | l.Objects = []Hittable{}
38 | }
39 |
40 | func (l *HitObjectList) Add(h Hittable) {
41 | l.Objects = append(l.Objects, h)
42 | }
43 |
44 | func (l HitObjectList) Hit(r vec.Ray3D, tMin float64, tMax float64, rec *HitRecord) bool {
45 | tempRec := HitRecord{
46 | P: vec.Zero(),
47 | Normal: vec.Zero(),
48 | t: 0,
49 | frontFace: false,
50 | }
51 | hitAnything := false
52 | closestSoFar := tMax
53 |
54 | for _, o := range l.Objects {
55 | if o.Hit(r, tMin, closestSoFar, &tempRec) {
56 | hitAnything = true
57 | closestSoFar = tempRec.t
58 |
59 | rec.P = tempRec.P
60 | rec.Normal = tempRec.Normal
61 | rec.t = tempRec.t
62 | rec.frontFace = tempRec.frontFace
63 | rec.Mat = tempRec.Mat
64 |
65 | // had to set values manually (above) - can't set to other object like below?
66 | //rec = &tempRec
67 | }
68 | }
69 |
70 | return hitAnything
71 | }
72 |
--------------------------------------------------------------------------------
/vec/camera.go:
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1 | package vec
2 |
3 | import (
4 | "github.com/razodactyl/go-raytracer/util"
5 | "math"
6 | )
7 |
8 | type Camera struct {
9 | Origin Vector3D
10 | LowerLeftCorner Vector3D
11 | Horizontal Vector3D
12 | Vertical Vector3D
13 | U, V, W Vector3D
14 | LensRadius float64
15 | }
16 |
17 | func NewCamera(lookFrom Vector3D, lookAt Vector3D, vup Vector3D, vfov float64, aspect float64, aperture float64, focusDist float64) *Camera {
18 | origin := lookFrom
19 | lensRadius := aperture / 2.0
20 |
21 | theta := util.DegreesToRadians(vfov)
22 | halfHeight := math.Tan(theta/2)
23 | halfWidth := aspect * halfHeight
24 |
25 | w := lookFrom.Subtract(lookAt).Unit()
26 | u := vup.Cross(w).Unit()
27 | v := w.Cross(u)
28 |
29 | uMulHalfWidth := u.MultiplyScalar(halfWidth).MultiplyScalar(focusDist)
30 | vMulHalfHeight := v.MultiplyScalar(halfHeight).MultiplyScalar(focusDist)
31 |
32 | lowerLeftCorner := origin.Subtract(uMulHalfWidth).Subtract(vMulHalfHeight).Subtract(w.MultiplyScalar(focusDist))
33 |
34 | horizontal := uMulHalfWidth.MultiplyScalar(2)
35 | vertical := vMulHalfHeight.MultiplyScalar(2)
36 |
37 | return &Camera{
38 | LowerLeftCorner: lowerLeftCorner,
39 | Horizontal: horizontal,
40 | Vertical: vertical,
41 | Origin: origin,
42 | U: u,
43 | V: v,
44 | W: w,
45 | LensRadius: lensRadius,
46 | }
47 | }
48 |
49 | func (c Camera) GetRay(s float64, t float64) Ray3D {
50 | rd := RandomInUnitDisk().MultiplyScalar(c.LensRadius)
51 | offset := c.U.MultiplyScalar(rd.X).Add(c.V.MultiplyScalar(rd.Y))
52 |
53 | sMulHorizontal := c.Horizontal.MultiplyScalar(s)
54 | tMulVertical := c.Vertical.MultiplyScalar(t)
55 |
56 | return NewRay3D(c.Origin.Add(offset), c.LowerLeftCorner.Add(sMulHorizontal).Add(tMulVertical).Subtract(c.Origin).Subtract(offset))
57 | }
58 |
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/hittable/material.go:
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1 | package hittable
2 |
3 | import (
4 | "github.com/razodactyl/go-raytracer/util"
5 | "github.com/razodactyl/go-raytracer/vec"
6 | "math"
7 | )
8 |
9 | type Material interface {
10 | Scatter(rIn vec.Ray3D, rec HitRecord, attenuation *vec.Vector3D, scattered *vec.Ray3D) bool
11 | }
12 |
13 | // Lambertian material
14 |
15 | type Lambertian struct {
16 | Albedo vec.Vector3D
17 | }
18 |
19 | func (l Lambertian) Scatter(rIn vec.Ray3D, rec HitRecord, attenuation *vec.Vector3D, scattered *vec.Ray3D) bool {
20 | scatterDirection := rec.Normal.Add(vec.RandomUnitVector())
21 | *scattered = vec.NewRay3D(rec.P, scatterDirection)
22 | *attenuation = l.Albedo
23 | return true
24 | }
25 |
26 | // Metal material
27 |
28 | type Metal struct {
29 | Albedo vec.Vector3D
30 | Fuzz float64
31 | }
32 |
33 | func NewMetal(albedo vec.Vector3D, fuzz float64) *Metal {
34 | return &Metal{Albedo: albedo, Fuzz: util.Clamp(fuzz, 0, 1)}
35 | }
36 |
37 | func (m Metal) Scatter(rIn vec.Ray3D, rec HitRecord, attenuation *vec.Vector3D, scattered *vec.Ray3D) bool {
38 | reflected := vec.Reflect(rIn.Direction.Unit(), rec.Normal)
39 | *scattered = vec.NewRay3D(rec.P, reflected.Add(vec.RandomInUnitSphere().MultiplyScalar(m.Fuzz)))
40 | *attenuation = m.Albedo
41 | return scattered.Direction.Dot(rec.Normal) > 0
42 | }
43 |
44 | // Dielectric material
45 |
46 | type Dielectric struct {
47 | RefractionIndex float64
48 | }
49 |
50 | func NewDielectric(refractionIndex float64) *Dielectric {
51 | return &Dielectric{RefractionIndex: refractionIndex}
52 | }
53 |
54 | func Schlick(cosine float64, refractionIndex float64) float64 {
55 | r0 := (1-refractionIndex) / (1+refractionIndex)
56 | r0 = r0*r0
57 | return r0 + (1-r0)*math.Pow((1-cosine), 5)
58 | }
59 |
60 | func (d Dielectric) Scatter(rIn vec.Ray3D, rec HitRecord, attenuation *vec.Vector3D, scattered *vec.Ray3D) bool {
61 | *attenuation = vec.Unit()
62 | etaiOverEtat := 0.0
63 | if rec.frontFace {
64 | etaiOverEtat = 1.0 / d.RefractionIndex
65 | } else {
66 | etaiOverEtat = d.RefractionIndex
67 | }
68 |
69 | unitDirection := rIn.Direction.Unit()
70 |
71 | cosTheta := util.FFMin(unitDirection.MultiplyScalar(-1).Dot(rec.Normal), 1.0)
72 | sinTheta := math.Sqrt(1.0 - cosTheta*cosTheta)
73 | if etaiOverEtat * sinTheta > 1.0 {
74 | reflected := vec.Reflect(unitDirection, rec.Normal)
75 | *scattered = vec.NewRay3D(rec.P, reflected)
76 | return true
77 | }
78 | reflectProb := Schlick(cosTheta, etaiOverEtat)
79 | if util.Random() < reflectProb {
80 | reflected := vec.Reflect(unitDirection, rec.Normal)
81 | *scattered = vec.NewRay3D(rec.P, reflected)
82 | return true
83 | }
84 |
85 | refracted := vec.Refract(unitDirection, rec.Normal, etaiOverEtat)
86 | *scattered = vec.NewRay3D(rec.P, refracted)
87 | return true
88 | }
89 |
90 |
--------------------------------------------------------------------------------
/vec/vec.go:
--------------------------------------------------------------------------------
1 | package vec
2 |
3 | import (
4 | "fmt"
5 | "github.com/razodactyl/go-raytracer/util"
6 | "math"
7 | )
8 |
9 | type Vector3D struct {
10 | X float64
11 | Y float64
12 | Z float64
13 | }
14 |
15 | func NewVector3D(x, y, z float64) Vector3D {
16 | return Vector3D{x, y, z}
17 | }
18 |
19 | func FromScalar(v float64) Vector3D {
20 | return Vector3D{v,v,v}
21 | }
22 |
23 | func Zero() Vector3D {
24 | return Vector3D{0, 0, 0}
25 | }
26 |
27 | func Unit() Vector3D {
28 | return Vector3D{1, 1, 1}
29 | }
30 |
31 | func Random() Vector3D {
32 | return NewVector3D(util.Random(), util.Random(), util.Random())
33 | }
34 |
35 | func RandomBetween(min float64, max float64) Vector3D {
36 | return NewVector3D(util.RandomBetween(min, max), util.RandomBetween(min, max), util.RandomBetween(min, max))
37 | }
38 |
39 | func RandomInUnitSphere() Vector3D {
40 | for {
41 | p := RandomBetween(-1, 1)
42 | if p.LengthSquared() >= 1 { continue }
43 | return p
44 | }
45 | }
46 |
47 | func RandomUnitVector() Vector3D {
48 | a := util.RandomBetween(0, 2*math.Pi)
49 | z := util.RandomBetween(-1, 1)
50 | r := math.Sqrt(float64(1 - z*z))
51 | return NewVector3D(float64(r*math.Cos(float64(a))), float64(r*math.Sin(float64(a))), z)
52 | }
53 |
54 | func RandomInHemisphere(normal Vector3D) Vector3D {
55 | inUnitSphere := RandomInUnitSphere()
56 | if inUnitSphere.Dot(normal) > 0.0 { // In the same hemisphere as the normal
57 | return inUnitSphere
58 | } else {
59 | return inUnitSphere.MultiplyScalar(-1)
60 | }
61 | }
62 |
63 | func RandomInUnitDisk() Vector3D {
64 | for {
65 | p := NewVector3D(util.RandomBetween(-1,1), util.RandomBetween(-1,1), 0)
66 | if p.LengthSquared() >= 1 {
67 | continue
68 | }
69 | return p
70 | }
71 | }
72 |
73 | // Bending light.
74 |
75 | func Reflect(v Vector3D, n Vector3D) Vector3D {
76 | return v.Subtract(n.MultiplyScalar(v.Dot(n)*2))
77 | }
78 |
79 | func Refract(uv Vector3D, n Vector3D, etaiOverEtat float64) Vector3D {
80 | cosTheta := uv.MultiplyScalar(-1).Dot(n)
81 | rOutParallel := uv.Add(n.MultiplyScalar(cosTheta)).MultiplyScalar(etaiOverEtat)
82 | rOutPerp := n.MultiplyScalar(-math.Sqrt(1.0 - rOutParallel.LengthSquared()))
83 | return rOutParallel.Add(rOutPerp)
84 | }
85 |
86 | // Instance functions
87 |
88 | func (v Vector3D) Unit() Vector3D {
89 | return v.DivideScalar(v.Length())
90 | }
91 |
92 | func (v Vector3D) LengthSquared() float64 {
93 | return v.X * v.X + v.Y * v.Y + v.Z * v.Z
94 | }
95 |
96 | func (v Vector3D) Length() float64 {
97 | return math.Sqrt(v.LengthSquared())
98 | }
99 |
100 | func (v Vector3D) Copy() Vector3D {
101 | return Vector3D{v.X, v.Y, v.Z}
102 | }
103 |
104 | func (v Vector3D) Add(v2 Vector3D) Vector3D {
105 | return Vector3D{v.X + v2.X, v.Y + v2.Y, v.Z + v2.Z}
106 | }
107 |
108 | func (v Vector3D) Subtract(v2 Vector3D) Vector3D {
109 | return Vector3D{v.X - v2.X, v.Y - v2.Y, v.Z - v2.Z}
110 | }
111 |
112 | func (v Vector3D) Multiply(v2 Vector3D) Vector3D {
113 | return Vector3D{v.X * v2.X, v.Y * v2.Y, v.Z * v2.Z}
114 | }
115 |
116 | func (v Vector3D) Divide(v2 Vector3D) Vector3D {
117 | return Vector3D{v.X / v2.X, v.Y / v2.Y, v.Z / v2.Z}
118 | }
119 |
120 | func (v Vector3D) Dot(v2 Vector3D) float64 {
121 | return v.X * v2.X + v.Y * v2.Y + v.Z * v2.Z
122 | }
123 |
124 | func (v Vector3D) Cross(v2 Vector3D) Vector3D {
125 | return Vector3D{
126 | X: v.Y * v2.Z - v.Z * v2.Y,
127 | Y: v.Z * v2.X - v.X * v2.Z,
128 | Z: v.X * v2.Y - v.Y * v2.X,
129 | }
130 | }
131 |
132 | func (v Vector3D) MultiplyScalar(s float64) Vector3D {
133 | return Vector3D{v.X * s, v.Y * s, v.Z * s}
134 | }
135 |
136 | func (v Vector3D) DivideScalar(s float64) Vector3D {
137 | return Vector3D{v.X / s, v.Y / s, v.Z / s}
138 | }
139 |
140 | func (v Vector3D) ColorString(samplesPerPixel int) string {
141 | // Divide the color total by the number of samples and gamma-correct
142 | // for a gamma value of 2.0.
143 | scale := 1.0 / float64(samplesPerPixel)
144 | r := math.Sqrt(scale * v.X)
145 | g := math.Sqrt(scale * v.Y)
146 | b := math.Sqrt(scale * v.Z)
147 |
148 | return fmt.Sprintf("%v %v %v\n", int(256 * util.Clamp(r, 0.0, 0.999)), int(256 * util.Clamp(g, 0.0, 0.999)), int(256 * util.Clamp(b, 0.0, 0.999)))
149 | }
150 |
--------------------------------------------------------------------------------
/main.go:
--------------------------------------------------------------------------------
1 | package main
2 |
3 | // https://raytracing.github.io/
4 | // https://raytracing.github.io/books/RayTracingInOneWeekend.html
5 |
6 | import (
7 | "fmt"
8 | "math"
9 | "os"
10 | "sync"
11 |
12 | "github.com/razodactyl/go-raytracer/hittable"
13 | "github.com/razodactyl/go-raytracer/util"
14 | "github.com/razodactyl/go-raytracer/vec"
15 | )
16 |
17 | func check(e error) {
18 | if e != nil {
19 | panic(e)
20 | }
21 | }
22 |
23 | func rayColor(r vec.Ray3D, world *hittable.HitObjectList, depth int) vec.Vector3D {
24 | rec := hittable.HitRecord{}
25 |
26 | // If we've exceeded the ray bounce limit, no more light is gathered.
27 | if depth <= 0 {
28 | return vec.Zero()
29 | }
30 |
31 | if world.Hit(r, 0.001, float64(math.Inf(1)), &rec) {
32 | scattered := vec.Ray3D{
33 | Origin: vec.Vector3D{},
34 | Direction: vec.Vector3D{},
35 | }
36 | attenuation := vec.Zero()
37 | if rec.Mat.Scatter(r, rec, &attenuation, &scattered) {
38 | return attenuation.Multiply(rayColor(scattered, world, depth-1))
39 | }
40 | return vec.Zero()
41 |
42 | //target := rec.P.Add(vec.RandomInHemisphere(rec.Normal))
43 | //newRay := vec.NewRay3D(rec.P, target.Subtract(rec.P))
44 | //return rayColor(newRay, world, depth-1).MultiplyScalar(0.5)
45 |
46 | //return rec.Normal.Add(vec.Unit()).MultiplyScalar(0.5)
47 | }
48 | unitDirection := r.Direction.Unit()
49 | t := 0.5 * (unitDirection.Y + 1)
50 | return vec.Unit().MultiplyScalar(1.0 - t).Add(vec.NewVector3D(0.5, 0.7, 1.0).MultiplyScalar(t))
51 | }
52 |
53 | func randomScene() hittable.HitObjectList {
54 | world := hittable.NewHitObjectList()
55 |
56 | //world.Add(hittable.NewSphere(vec.NewVector3D(0,-1000,0), 1000, hittable.Lambertian{vec.NewVector3D(0.1, 0.4, 0.1)}))
57 | world.Add(hittable.NewSphere(vec.NewVector3D(0, -1000, 0), 1000, hittable.NewMetal(vec.NewVector3D(0.4, 0.9, 0.4), 0.0)))
58 |
59 | for a := -11.0; a < 11; a++ {
60 | for b := -11.0; b < 11; b++ {
61 | chooseMat := util.Random()
62 | center := vec.NewVector3D(a+0.9*util.Random(), 0.2, b+0.9*util.Random())
63 | if (center.Subtract(vec.NewVector3D(4, 0.2, 0))).Length() > 0.9 {
64 | if chooseMat < 0.8 {
65 | // diffuse
66 | albedo := vec.Random().Multiply(vec.Random())
67 | world.Add(hittable.NewSphere(center, 0.2, hittable.Lambertian{Albedo: albedo}))
68 | } else if chooseMat < 0.95 {
69 | // metal
70 | albedo := vec.RandomBetween(.5, 1)
71 | fuzz := util.RandomBetween(0, .5)
72 | world.Add(hittable.NewSphere(center, 0.2, hittable.NewMetal(albedo, fuzz)))
73 | } else {
74 | // glass
75 | world.Add(hittable.NewSphere(center, 0.2, hittable.NewDielectric(util.RandomBetween(1.2, 1.9))))
76 | }
77 | }
78 | }
79 | }
80 |
81 | world.Add(hittable.NewSphere(vec.NewVector3D(4, 1, 0), 1.0, hittable.NewDielectric(1.1)))
82 | //world.Add(hittable.NewSphere(vec.NewVector3D(0, 1, 0), 1.0, hittable.Lambertian{vec.NewVector3D(0.3, 1, 0.3)}))
83 | world.Add(hittable.NewSphere(vec.NewVector3D(-4, 1, 0), 1.0, hittable.NewMetal(vec.NewVector3D(0.4, 0.9, 0.4), 0.0)))
84 |
85 | //world.Add(hittable.NewSphere(vec.NewVector3D(0,0,-1), 0.5, hittable.Lambertian{vec.NewVector3D(0.1, 0.2, 0.5)}))
86 | //world.Add(hittable.NewSphere(vec.NewVector3D(0,-100.5,-1), 100, hittable.Lambertian{vec.NewVector3D(0.8, 0.8, 0.0)}))
87 | //world.Add(hittable.NewSphere(vec.NewVector3D(1,0,-1), 0.5, hittable.NewMetal(vec.NewVector3D(0.8, 0.6, 0.2), 0.3)))
88 | //world.Add(hittable.NewSphere(vec.NewVector3D(-1,0,-1), 0.5, hittable.NewDielectric(1.5)))
89 | //world.Add(hittable.NewSphere(vec.NewVector3D(-1,0,-1), -0.45, hittable.NewDielectric(1.5)))
90 |
91 | return *world
92 | }
93 |
94 | const imageWidth = 200 * 4
95 | const imageHeight = 100 * 4
96 | const samplesPerPixel = 100
97 | const maxDepth = 50 * 1
98 |
99 | func main() {
100 | //cfg := pixelgl.WindowConfig{
101 | // Title: "Go Raytracer",
102 | // Bounds: pixel.R(0, 0, imageWidth, imageHeight),
103 | // VSync: true,
104 | //}
105 | //win, err := pixelgl.NewWindow(cfg)
106 | //check(err)
107 | //
108 | //for !win.Closed() {
109 | // win.Clear(colornames.Aliceblue)
110 | // win.Update()
111 | //}
112 |
113 | f, err := os.Create(fmt.Sprintf("./image%vx%v-spp%v-depth%v.ppm", imageWidth, imageHeight, samplesPerPixel, maxDepth))
114 | check(err)
115 |
116 | defer f.Close()
117 |
118 | f.WriteString(fmt.Sprintf("P3\n%v %v\n255\n", imageWidth, imageHeight))
119 |
120 | world := randomScene()
121 |
122 | aspectRatio := float64(imageWidth / imageHeight)
123 | lookFrom := vec.NewVector3D(13, 2, 3)
124 | lookAt := vec.NewVector3D(0, 0, 0)
125 | vup := vec.NewVector3D(0, 1, 0)
126 | //aperture := 2.0
127 | //distToFocus := (lookFrom.Subtract(lookAt)).Length()
128 | distToFocus := 10.0
129 | aperture := 0.1
130 | camera := vec.NewCamera(lookFrom, lookAt, vup, 30, aspectRatio, aperture, distToFocus)
131 |
132 | var wg sync.WaitGroup
133 | c := make(chan orderedPixel, imageWidth*imageHeight)
134 |
135 | wg.Add(imageWidth * imageHeight)
136 | fmt.Println(imageWidth * imageHeight)
137 | for j := imageHeight; j > 0; j-- {
138 | fmt.Println("\rScanlines remaining: ", j, " ")
139 | for i := 0; i < imageWidth; i++ {
140 | go renderPixel(&wg, c, samplesPerPixel, maxDepth, imageWidth, imageHeight, i, j, camera, world)
141 | }
142 | }
143 | wg.Wait()
144 |
145 | writePixels(c, *f, samplesPerPixel)
146 |
147 | fmt.Println("Done.")
148 | }
149 |
150 | type orderedPixel struct {
151 | color vec.Vector3D
152 | x int
153 | y int
154 | }
155 |
156 | func renderPixel(wg *sync.WaitGroup, c chan orderedPixel, samplesPerPixel int, maxDepth int, imageWidth float64, imageHeight float64, i int, j int, camera *vec.Camera, world hittable.HitObjectList) {
157 | color := vec.Zero()
158 |
159 | for s := 0; s < samplesPerPixel; s++ {
160 | u := (float64(i) + util.Random()) / imageWidth
161 | v := (float64(j) + util.Random()) / imageHeight
162 | r := camera.GetRay(u, v)
163 | color = color.Add(rayColor(r, &world, maxDepth))
164 | }
165 |
166 | c <- orderedPixel{
167 | color: color,
168 | x: i,
169 | y: j,
170 | }
171 |
172 | wg.Done()
173 | }
174 |
175 | func writePixels(c chan orderedPixel, file os.File, samplesPerPixel int) {
176 | var pixels [imageWidth + 1][imageHeight + 1]vec.Vector3D
177 |
178 | var wg sync.WaitGroup
179 | wg.Add(imageWidth * imageHeight)
180 | for j := imageHeight; j > 0; j-- {
181 | for i := 0; i < imageWidth; i++ {
182 | pixel := <-c
183 | pixels[pixel.x][pixel.y] = pixel.color
184 | wg.Done()
185 | }
186 | }
187 | wg.Wait()
188 |
189 | //wg.Add(imageWidth * imageHeight)
190 | steps := 0.0
191 | fmt.Println("Writing file...")
192 | for j := imageHeight; j > 0; j-- {
193 | for i := 0; i < imageWidth; i++ {
194 | steps += 1
195 | //percent := int((steps / (imageWidth * imageHeight)) * 100)
196 | //fmt.Println("Writing file:", percent, "%")
197 | file.WriteString(pixels[i][j].ColorString(samplesPerPixel))
198 | //wg.Done()
199 | }
200 | }
201 | file.Sync()
202 | //wg.Wait()
203 | }
204 |
--------------------------------------------------------------------------------
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475 | work thus licensed is called the contributor's "contributor version".
476 |
477 | A contributor's "essential patent claims" are all patent claims
478 | owned or controlled by the contributor, whether already acquired or
479 | hereafter acquired, that would be infringed by some manner, permitted
480 | by this License, of making, using, or selling its contributor version,
481 | but do not include claims that would be infringed only as a
482 | consequence of further modification of the contributor version. For
483 | purposes of this definition, "control" includes the right to grant
484 | patent sublicenses in a manner consistent with the requirements of
485 | this License.
486 |
487 | Each contributor grants you a non-exclusive, worldwide, royalty-free
488 | patent license under the contributor's essential patent claims, to
489 | make, use, sell, offer for sale, import and otherwise run, modify and
490 | propagate the contents of its contributor version.
491 |
492 | In the following three paragraphs, a "patent license" is any express
493 | agreement or commitment, however denominated, not to enforce a patent
494 | (such as an express permission to practice a patent or covenant not to
495 | sue for patent infringement). To "grant" such a patent license to a
496 | party means to make such an agreement or commitment not to enforce a
497 | patent against the party.
498 |
499 | If you convey a covered work, knowingly relying on a patent license,
500 | and the Corresponding Source of the work is not available for anyone
501 | to copy, free of charge and under the terms of this License, through a
502 | publicly available network server or other readily accessible means,
503 | then you must either (1) cause the Corresponding Source to be so
504 | available, or (2) arrange to deprive yourself of the benefit of the
505 | patent license for this particular work, or (3) arrange, in a manner
506 | consistent with the requirements of this License, to extend the patent
507 | license to downstream recipients. "Knowingly relying" means you have
508 | actual knowledge that, but for the patent license, your conveying the
509 | covered work in a country, or your recipient's use of the covered work
510 | in a country, would infringe one or more identifiable patents in that
511 | country that you have reason to believe are valid.
512 |
513 | If, pursuant to or in connection with a single transaction or
514 | arrangement, you convey, or propagate by procuring conveyance of, a
515 | covered work, and grant a patent license to some of the parties
516 | receiving the covered work authorizing them to use, propagate, modify
517 | or convey a specific copy of the covered work, then the patent license
518 | you grant is automatically extended to all recipients of the covered
519 | work and works based on it.
520 |
521 | A patent license is "discriminatory" if it does not include within
522 | the scope of its coverage, prohibits the exercise of, or is
523 | conditioned on the non-exercise of one or more of the rights that are
524 | specifically granted under this License. You may not convey a covered
525 | work if you are a party to an arrangement with a third party that is
526 | in the business of distributing software, under which you make payment
527 | to the third party based on the extent of your activity of conveying
528 | the work, and under which the third party grants, to any of the
529 | parties who would receive the covered work from you, a discriminatory
530 | patent license (a) in connection with copies of the covered work
531 | conveyed by you (or copies made from those copies), or (b) primarily
532 | for and in connection with specific products or compilations that
533 | contain the covered work, unless you entered into that arrangement,
534 | or that patent license was granted, prior to 28 March 2007.
535 |
536 | Nothing in this License shall be construed as excluding or limiting
537 | any implied license or other defenses to infringement that may
538 | otherwise be available to you under applicable patent law.
539 |
540 | 12. No Surrender of Others' Freedom.
541 |
542 | If conditions are imposed on you (whether by court order, agreement or
543 | otherwise) that contradict the conditions of this License, they do not
544 | excuse you from the conditions of this License. If you cannot convey a
545 | covered work so as to satisfy simultaneously your obligations under this
546 | License and any other pertinent obligations, then as a consequence you may
547 | not convey it at all. For example, if you agree to terms that obligate you
548 | to collect a royalty for further conveying from those to whom you convey
549 | the Program, the only way you could satisfy both those terms and this
550 | License would be to refrain entirely from conveying the Program.
551 |
552 | 13. Use with the GNU Affero General Public License.
553 |
554 | Notwithstanding any other provision of this License, you have
555 | permission to link or combine any covered work with a work licensed
556 | under version 3 of the GNU Affero General Public License into a single
557 | combined work, and to convey the resulting work. The terms of this
558 | License will continue to apply to the part which is the covered work,
559 | but the special requirements of the GNU Affero General Public License,
560 | section 13, concerning interaction through a network will apply to the
561 | combination as such.
562 |
563 | 14. Revised Versions of this License.
564 |
565 | The Free Software Foundation may publish revised and/or new versions of
566 | the GNU General Public License from time to time. Such new versions will
567 | be similar in spirit to the present version, but may differ in detail to
568 | address new problems or concerns.
569 |
570 | Each version is given a distinguishing version number. If the
571 | Program specifies that a certain numbered version of the GNU General
572 | Public License "or any later version" applies to it, you have the
573 | option of following the terms and conditions either of that numbered
574 | version or of any later version published by the Free Software
575 | Foundation. If the Program does not specify a version number of the
576 | GNU General Public License, you may choose any version ever published
577 | by the Free Software Foundation.
578 |
579 | If the Program specifies that a proxy can decide which future
580 | versions of the GNU General Public License can be used, that proxy's
581 | public statement of acceptance of a version permanently authorizes you
582 | to choose that version for the Program.
583 |
584 | Later license versions may give you additional or different
585 | permissions. However, no additional obligations are imposed on any
586 | author or copyright holder as a result of your choosing to follow a
587 | later version.
588 |
589 | 15. Disclaimer of Warranty.
590 |
591 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
592 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
599 |
600 | 16. Limitation of Liability.
601 |
602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
610 | SUCH DAMAGES.
611 |
612 | 17. Interpretation of Sections 15 and 16.
613 |
614 | If the disclaimer of warranty and limitation of liability provided
615 | above cannot be given local legal effect according to their terms,
616 | reviewing courts shall apply local law that most closely approximates
617 | an absolute waiver of all civil liability in connection with the
618 | Program, unless a warranty or assumption of liability accompanies a
619 | copy of the Program in return for a fee.
620 |
621 | END OF TERMS AND CONDITIONS
622 |
623 | How to Apply These Terms to Your New Programs
624 |
625 | If you develop a new program, and you want it to be of the greatest
626 | possible use to the public, the best way to achieve this is to make it
627 | free software which everyone can redistribute and change under these terms.
628 |
629 | To do so, attach the following notices to the program. It is safest
630 | to attach them to the start of each source file to most effectively
631 | state the exclusion of warranty; and each file should have at least
632 | the "copyright" line and a pointer to where the full notice is found.
633 |
634 |
635 | Copyright (C)
636 |
637 | This program is free software: you can redistribute it and/or modify
638 | it under the terms of the GNU General Public License as published by
639 | the Free Software Foundation, either version 3 of the License, or
640 | (at your option) any later version.
641 |
642 | This program is distributed in the hope that it will be useful,
643 | but WITHOUT ANY WARRANTY; without even the implied warranty of
644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
645 | GNU General Public License for more details.
646 |
647 | You should have received a copy of the GNU General Public License
648 | along with this program. If not, see .
649 |
650 | Also add information on how to contact you by electronic and paper mail.
651 |
652 | If the program does terminal interaction, make it output a short
653 | notice like this when it starts in an interactive mode:
654 |
655 | Copyright (C)
656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
657 | This is free software, and you are welcome to redistribute it
658 | under certain conditions; type `show c' for details.
659 |
660 | The hypothetical commands `show w' and `show c' should show the appropriate
661 | parts of the General Public License. Of course, your program's commands
662 | might be different; for a GUI interface, you would use an "about box".
663 |
664 | You should also get your employer (if you work as a programmer) or school,
665 | if any, to sign a "copyright disclaimer" for the program, if necessary.
666 | For more information on this, and how to apply and follow the GNU GPL, see
667 | .
668 |
669 | The GNU General Public License does not permit incorporating your program
670 | into proprietary programs. If your program is a subroutine library, you
671 | may consider it more useful to permit linking proprietary applications with
672 | the library. If this is what you want to do, use the GNU Lesser General
673 | Public License instead of this License. But first, please read
674 | .
675 |
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