Move code to packages.

src/main/kotlin/Hit.kt

@@ -1 +1,5 @@
+import materials.Material
+import math.Point
+import math.Vector
+
 data class Hit(val point: Point, val normal: Vector, val distance: Float, val material: Material)

src/main/kotlin/PointLight.kt

@@ -1 +0,0 @@
-data class PointLight(val point: Point, val color: MaterialColor)

src/main/kotlin/Ray.kt

@@ -1,11 +1,16 @@
+import lights.PointLight
+import materials.MaterialColor
+import materials.ReflectiveMaterial
+import materials.WhateverMaterial
+import materials.times
+import math.Point
+import math.Vector
+import things.Plane
+import things.Scene
+import things.Sphere
 import java.io.File
 
 
-data class Ray(val origin: Point, val direction: Vector) {
-    fun at(t: Float) = origin + t * direction
-}
-
-
 fun main() {
     val bmp = Bitmap(1000, 1000)
     val origin = Point(500f, 500f, -500f)

src/main/kotlin/lights/Light.kt

@@ -0,0 +1,3 @@
+package lights
+
+interface Light

src/main/kotlin/lights/PointLight.kt

@@ -0,0 +1,6 @@
+package lights
+
+import materials.MaterialColor
+import math.Point
+
+data class PointLight(val point: Point, val color: MaterialColor) : Light

src/main/kotlin/materials/Material.kt

@@ -1,3 +1,9 @@
+package materials
+
+import Hit
+import math.Ray
+import things.Scene
+
 interface Material {
     fun shade(ray: Ray, hit: Hit, scene: Scene): MaterialColor
 }

src/main/kotlin/materials/MaterialColor.kt

@@ -1,3 +1,7 @@
+package materials
+
+import Color
+
 data class MaterialColor(val r: Float, val g: Float, val b: Float) {
     fun toColor(): Color = Color(
         (r * UByte.MAX_VALUE.toFloat()).toInt().toUByte(),

src/main/kotlin/materials/ReflectiveMaterial.kt

@@ -1,3 +1,9 @@
+package materials
+
+import Hit
+import math.Ray
+import things.Scene
+import math.times
 import kotlin.math.pow
 
 data class ReflectiveMaterial(

src/main/kotlin/materials/WhateverMaterial.kt

@@ -1,3 +1,9 @@
+package materials
+
+import Hit
+import math.Ray
+import things.Scene
+import math.times
 import kotlin.math.pow
 
 data class WhateverMaterial(val color: MaterialColor,

src/main/kotlin/math/Point.kt

@@ -1,6 +1,8 @@
+package math
+
 data class Point(val x: Float, val y: Float, val z: Float) {
     operator fun plus(rhs: Vector) : Point = Point(x + rhs.x, y + rhs.y, z + rhs.z)
     operator fun minus(rhs: Point): Vector = Vector(x - rhs.x, y - rhs.y, z - rhs.z)
 
     fun rayTo(other: Point) = Ray(this, (other - this).normalized())
-}
+}

src/main/kotlin/math/Ray.kt

@@ -0,0 +1,5 @@
+package math
+
+data class Ray(val origin: Point, val direction: Vector) {
+    fun at(t: Float) = origin + t * direction
+}

src/main/kotlin/math/Vector.kt

@@ -1,3 +1,5 @@
+package math
+
 import kotlin.math.sqrt
 
 data class Vector(val x: Float, val y: Float, val z: Float) {

src/main/kotlin/things/Plane.kt

@@ -1,3 +1,11 @@
+package things
+
+import Hit
+import math.Point
+import math.Ray
+import math.Vector
+import materials.Material
+
 data class Plane(val point: Point, val normal: Vector, val material: Material) : Thing {
     override fun intersects(ray: Ray): Hit? {
         val bottom = normal dot ray.direction

src/main/kotlin/things/Scene.kt

@@ -1,3 +1,10 @@
+package things
+
+import Hit
+import materials.MaterialColor
+import lights.PointLight
+import math.Ray
+
 data class Scene(val things: List<Thing>, val light: PointLight): Thing {
     override fun intersects(ray: Ray): Hit? {
         var closest: Hit? = null

src/main/kotlin/things/Sphere.kt

@@ -1,3 +1,9 @@
+package things
+
+import Hit
+import math.Point
+import math.Ray
+import materials.Material
 import kotlin.math.min
 import kotlin.math.sqrt
 

src/main/kotlin/things/Thing.kt

@@ -1,3 +1,8 @@
+package things
+
+import Hit
+import math.Ray
+
 interface Thing {
     fun intersects(ray: Ray): Hit?
 }