diff --git a/.gitignore b/.gitignore index 2100949..337e3a2 100644 --- a/.gitignore +++ b/.gitignore @@ -1,4 +1,27 @@ -.idea/ -*.tga +.gradle +build/ +!gradle/wrapper/gradle-wrapper.jar +!**/src/main/**/build/ +!**/src/test/**/build/ + +### IntelliJ IDEA ### +.idea/modules.xml +.idea/jarRepositories.xml +.idea/compiler.xml +.idea/libraries/ +*.iws *.iml +*.ipr out/ +!**/src/main/**/out/ +!**/src/test/**/out/ + +### Kotlin ### +.kotlin + + +### Mac OS ### +.DS_Store + + +test.tga diff --git a/.idea/.gitignore b/.idea/.gitignore new file mode 100644 index 0000000..26d3352 --- /dev/null +++ b/.idea/.gitignore @@ -0,0 +1,3 @@ +# Default ignored files +/shelf/ +/workspace.xml diff --git a/.idea/.name b/.idea/.name new file mode 100644 index 0000000..c5d0eb8 --- /dev/null +++ b/.idea/.name @@ -0,0 +1 @@ +Ray \ No newline at end of file diff --git a/.idea/codeStyles/Project.xml b/.idea/codeStyles/Project.xml new file mode 100644 index 0000000..1bec35e --- /dev/null +++ b/.idea/codeStyles/Project.xml @@ -0,0 +1,10 @@ + + + + + + + + \ No newline at end of file diff --git a/.idea/codeStyles/codeStyleConfig.xml b/.idea/codeStyles/codeStyleConfig.xml new file mode 100644 index 0000000..79ee123 --- /dev/null +++ b/.idea/codeStyles/codeStyleConfig.xml @@ -0,0 +1,5 @@ + + + + \ No newline at end of file diff --git a/.idea/gradle.xml b/.idea/gradle.xml new file mode 100644 index 0000000..f2c1963 --- /dev/null +++ b/.idea/gradle.xml @@ -0,0 +1,17 @@ + + + + + + + \ No newline at end of file diff --git a/.idea/kotlinc.xml b/.idea/kotlinc.xml new file mode 100644 index 0000000..c224ad5 --- /dev/null +++ b/.idea/kotlinc.xml @@ -0,0 +1,6 @@ + + + + + \ No newline at end of file diff --git a/.idea/misc.xml b/.idea/misc.xml new file mode 100644 index 0000000..82e74d9 --- /dev/null +++ b/.idea/misc.xml @@ -0,0 +1,7 @@ + + + + + + + \ No newline at end of file diff --git a/.idea/vcs.xml b/.idea/vcs.xml new file mode 100644 index 0000000..35eb1dd --- /dev/null +++ b/.idea/vcs.xml @@ -0,0 +1,6 @@ + + + + + + \ No newline at end of file diff --git a/build.gradle.kts b/build.gradle.kts new file mode 100644 index 0000000..0aea81a --- /dev/null +++ b/build.gradle.kts @@ -0,0 +1,18 @@ +plugins { + kotlin("jvm") version "2.0.21" +} + +group = "org.example" +version = "1.0-SNAPSHOT" + +repositories { + mavenCentral() +} + +dependencies { + testImplementation(kotlin("test")) +} + +tasks.test { + useJUnitPlatform() +} diff --git a/gradle.properties b/gradle.properties new file mode 100644 index 0000000..7fc6f1f --- /dev/null +++ b/gradle.properties @@ -0,0 +1 @@ +kotlin.code.style=official diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar new file mode 100644 index 0000000..249e583 Binary files /dev/null and b/gradle/wrapper/gradle-wrapper.jar differ diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties new file mode 100644 index 0000000..ce18f94 --- /dev/null +++ b/gradle/wrapper/gradle-wrapper.properties @@ -0,0 +1,6 @@ +#Wed Nov 20 18:10:35 CET 2024 +distributionBase=GRADLE_USER_HOME +distributionPath=wrapper/dists +distributionUrl=https\://services.gradle.org/distributions/gradle-8.10-bin.zip +zipStoreBase=GRADLE_USER_HOME +zipStorePath=wrapper/dists diff --git a/gradlew b/gradlew new file mode 100644 index 0000000..1b6c787 --- /dev/null +++ b/gradlew @@ -0,0 +1,234 @@ +#!/bin/sh + +# +# Copyright © 2015-2021 the original authors. +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# https://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. +# + +############################################################################## +# +# Gradle start up script for POSIX generated by Gradle. +# +# Important for running: +# +# (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is +# noncompliant, but you have some other compliant shell such as ksh or +# bash, then to run this script, type that shell name before the whole +# command line, like: +# +# ksh Gradle +# +# Busybox and similar reduced shells will NOT work, because this script +# requires all of these POSIX shell features: +# * functions; +# * expansions «$var», «${var}», «${var:-default}», «${var+SET}», +# «${var#prefix}», «${var%suffix}», and «$( cmd )»; +# * compound commands having a testable exit status, especially «case»; +# * various built-in commands including «command», «set», and «ulimit». +# +# Important for patching: +# +# (2) This script targets any POSIX shell, so it avoids extensions provided +# by Bash, Ksh, etc; in particular arrays are avoided. +# +# The "traditional" practice of packing multiple parameters into a +# space-separated string is a well documented source of bugs and security +# problems, so this is (mostly) avoided, by progressively accumulating +# options in "$@", and eventually passing that to Java. +# +# Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS, +# and GRADLE_OPTS) rely on word-splitting, this is performed explicitly; +# see the in-line comments for details. +# +# There are tweaks for specific operating systems such as AIX, CygWin, +# Darwin, MinGW, and NonStop. +# +# (3) This script is generated from the Groovy template +# https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt +# within the Gradle project. +# +# You can find Gradle at https://github.com/gradle/gradle/. +# +############################################################################## + +# Attempt to set APP_HOME + +# Resolve links: $0 may be a link +app_path=$0 + +# Need this for daisy-chained symlinks. +while + APP_HOME=${app_path%"${app_path##*/}"} # leaves a trailing /; empty if no leading path + [ -h "$app_path" ] +do + ls=$( ls -ld "$app_path" ) + link=${ls#*' -> '} + case $link in #( + /*) app_path=$link ;; #( + *) app_path=$APP_HOME$link ;; + esac +done + +APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit + +APP_NAME="Gradle" +APP_BASE_NAME=${0##*/} + +# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. +DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"' + +# Use the maximum available, or set MAX_FD != -1 to use that value. +MAX_FD=maximum + +warn () { + echo "$*" +} >&2 + +die () { + echo + echo "$*" + echo + exit 1 +} >&2 + +# OS specific support (must be 'true' or 'false'). +cygwin=false +msys=false +darwin=false +nonstop=false +case "$( uname )" in #( + CYGWIN* ) cygwin=true ;; #( + Darwin* ) darwin=true ;; #( + MSYS* | MINGW* ) msys=true ;; #( + NONSTOP* ) nonstop=true ;; +esac + +CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar + + +# Determine the Java command to use to start the JVM. +if [ -n "$JAVA_HOME" ] ; then + if [ -x "$JAVA_HOME/jre/sh/java" ] ; then + # IBM's JDK on AIX uses strange locations for the executables + JAVACMD=$JAVA_HOME/jre/sh/java + else + JAVACMD=$JAVA_HOME/bin/java + fi + if [ ! -x "$JAVACMD" ] ; then + die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME + +Please set the JAVA_HOME variable in your environment to match the +location of your Java installation." + fi +else + JAVACMD=java + which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. + +Please set the JAVA_HOME variable in your environment to match the +location of your Java installation." +fi + +# Increase the maximum file descriptors if we can. +if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then + case $MAX_FD in #( + max*) + MAX_FD=$( ulimit -H -n ) || + warn "Could not query maximum file descriptor limit" + esac + case $MAX_FD in #( + '' | soft) :;; #( + *) + ulimit -n "$MAX_FD" || + warn "Could not set maximum file descriptor limit to $MAX_FD" + esac +fi + +# Collect all arguments for the java command, stacking in reverse order: +# * args from the command line +# * the main class name +# * -classpath +# * -D...appname settings +# * --module-path (only if needed) +# * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables. + +# For Cygwin or MSYS, switch paths to Windows format before running java +if "$cygwin" || "$msys" ; then + APP_HOME=$( cygpath --path --mixed "$APP_HOME" ) + CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" ) + + JAVACMD=$( cygpath --unix "$JAVACMD" ) + + # Now convert the arguments - kludge to limit ourselves to /bin/sh + for arg do + if + case $arg in #( + -*) false ;; # don't mess with options #( + /?*) t=${arg#/} t=/${t%%/*} # looks like a POSIX filepath + [ -e "$t" ] ;; #( + *) false ;; + esac + then + arg=$( cygpath --path --ignore --mixed "$arg" ) + fi + # Roll the args list around exactly as many times as the number of + # args, so each arg winds up back in the position where it started, but + # possibly modified. + # + # NB: a `for` loop captures its iteration list before it begins, so + # changing the positional parameters here affects neither the number of + # iterations, nor the values presented in `arg`. + shift # remove old arg + set -- "$@" "$arg" # push replacement arg + done +fi + +# Collect all arguments for the java command; +# * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of +# shell script including quotes and variable substitutions, so put them in +# double quotes to make sure that they get re-expanded; and +# * put everything else in single quotes, so that it's not re-expanded. + +set -- \ + "-Dorg.gradle.appname=$APP_BASE_NAME" \ + -classpath "$CLASSPATH" \ + org.gradle.wrapper.GradleWrapperMain \ + "$@" + +# Use "xargs" to parse quoted args. +# +# With -n1 it outputs one arg per line, with the quotes and backslashes removed. +# +# In Bash we could simply go: +# +# readarray ARGS < <( xargs -n1 <<<"$var" ) && +# set -- "${ARGS[@]}" "$@" +# +# but POSIX shell has neither arrays nor command substitution, so instead we +# post-process each arg (as a line of input to sed) to backslash-escape any +# character that might be a shell metacharacter, then use eval to reverse +# that process (while maintaining the separation between arguments), and wrap +# the whole thing up as a single "set" statement. +# +# This will of course break if any of these variables contains a newline or +# an unmatched quote. +# + +eval "set -- $( + printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" | + xargs -n1 | + sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' | + tr '\n' ' ' + )" '"$@"' + +exec "$JAVACMD" "$@" diff --git a/gradlew.bat b/gradlew.bat new file mode 100644 index 0000000..107acd3 --- /dev/null +++ b/gradlew.bat @@ -0,0 +1,89 @@ +@rem +@rem Copyright 2015 the original author or authors. +@rem +@rem Licensed under the Apache License, Version 2.0 (the "License"); +@rem you may not use this file except in compliance with the License. +@rem You may obtain a copy of the License at +@rem +@rem https://www.apache.org/licenses/LICENSE-2.0 +@rem +@rem Unless required by applicable law or agreed to in writing, software +@rem distributed under the License is distributed on an "AS IS" BASIS, +@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +@rem See the License for the specific language governing permissions and +@rem limitations under the License. +@rem + +@if "%DEBUG%" == "" @echo off +@rem ########################################################################## +@rem +@rem Gradle startup script for Windows +@rem +@rem ########################################################################## + +@rem Set local scope for the variables with windows NT shell +if "%OS%"=="Windows_NT" setlocal + +set DIRNAME=%~dp0 +if "%DIRNAME%" == "" set DIRNAME=. +set APP_BASE_NAME=%~n0 +set APP_HOME=%DIRNAME% + +@rem Resolve any "." and ".." in APP_HOME to make it shorter. +for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi + +@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. +set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m" + +@rem Find java.exe +if defined JAVA_HOME goto findJavaFromJavaHome + +set JAVA_EXE=java.exe +%JAVA_EXE% -version >NUL 2>&1 +if "%ERRORLEVEL%" == "0" goto execute + +echo. +echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. +echo. +echo Please set the JAVA_HOME variable in your environment to match the +echo location of your Java installation. + +goto fail + +:findJavaFromJavaHome +set JAVA_HOME=%JAVA_HOME:"=% +set JAVA_EXE=%JAVA_HOME%/bin/java.exe + +if exist "%JAVA_EXE%" goto execute + +echo. +echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% +echo. +echo Please set the JAVA_HOME variable in your environment to match the +echo location of your Java installation. + +goto fail + +:execute +@rem Setup the command line + +set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar + + +@rem Execute Gradle +"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %* + +:end +@rem End local scope for the variables with windows NT shell +if "%ERRORLEVEL%"=="0" goto mainEnd + +:fail +rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of +rem the _cmd.exe /c_ return code! +if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1 +exit /b 1 + +:mainEnd +if "%OS%"=="Windows_NT" endlocal + +:omega diff --git a/settings.gradle.kts b/settings.gradle.kts new file mode 100644 index 0000000..5e83f19 --- /dev/null +++ b/settings.gradle.kts @@ -0,0 +1,2 @@ +rootProject.name = "Ray" + diff --git a/src/Ray.kt b/src/Ray.kt deleted file mode 100644 index 6ca7ffc..0000000 --- a/src/Ray.kt +++ /dev/null @@ -1,130 +0,0 @@ -import java.io.File -import java.lang.Float.max -import kotlin.math.min -import kotlin.math.pow -import kotlin.math.sqrt - -data class Hit(val point: Point, val normal: Vector, val distance: Float, val color: MaterialColor) - -data class MaterialColor(val r: Float, val g: Float, val b: Float) { - fun toColor(): Color = Color( - (r * UByte.MAX_VALUE.toFloat()).toInt().toUByte(), - (g * UByte.MAX_VALUE.toFloat()).toInt().toUByte(), - (b * UByte.MAX_VALUE.toFloat()).toInt().toUByte() - ) - - operator fun times(rhs: MaterialColor) = MaterialColor(r * rhs.r, g * rhs.g, b * rhs.b) - operator fun plus(rhs: MaterialColor) = MaterialColor(r + rhs.r, g + rhs.g, b + rhs.b) -} - -operator fun Float.times(rhs: MaterialColor) = MaterialColor(this * rhs.r, this * rhs.g, this * rhs.b) - -data class Ray(val origin: Point, val direction: Vector) { - fun at(t: Float) = origin + t * direction -} - -interface Thing { - fun intersects(ray: Ray): Hit? -} - - -data class Plane(val point: Point, val normal: Vector, val color: MaterialColor) : Thing { - override fun intersects(ray: Ray): Hit? { - val bottom = dot(normal, ray.direction) - if (bottom == 0.0f) return null - val t = dot(normal, point - ray.origin) / bottom - if (t <= 0.0f) return null - return Hit(ray.at(t), normal, t, color) - } -} - -data class Sphere(val center: Point, val radius: Float, val color: MaterialColor) : Thing { - override fun intersects(ray: Ray): Hit? { - val l = center - ray.origin - val tc = dot(l, ray.direction) - if (tc < 0f) return null - - val d = l.squaredLength - tc * tc - val radiusSquared = radius * radius - - if (d > radiusSquared) return null - - val thc = sqrt(radiusSquared - d) - - val t = min(tc - thc, tc + thc) - - val hitPoint = ray.at(t) - return Hit(hitPoint, (hitPoint - center).normalized(), t, color) - } -} - -fun dot(lhs: Vector, rhs: Vector): Float = lhs.x * rhs.x + lhs.y * rhs.y + lhs.z * rhs.z - -data class PointLight(val point: Point, val color: MaterialColor) - -data class Scene(val things: List): Thing { - override fun intersects(ray: Ray): Hit? { - var closest: Hit? = null - for (thing in things) { - val hit = thing.intersects(ray) - if (hit != null && (closest == null || hit.distance < closest.distance)) { - closest = hit - } - } - - return closest - } -} - -fun main() { - val bmp = Bitmap(1000, 1000) - val origin = Point(500f, 500f, -500f) - - val sphere = Sphere(Point(500f, 500f, 500f), radius = 500f, color = MaterialColor(0f, 1.0f, 0f)) - val plane = Plane( - Point(0f, -1000f, 0f), - normal = Vector(0f, 1f, 0f), - color = MaterialColor(0.5f, 0.5f, 0.5f) - ) - - val leftPlane = Plane( - Point(-1000f, 0f, 0f), - Vector(1f, 0f, 0f), - color = MaterialColor(0.9f, 0.9f, 0.5f) - ) - - val scene = Scene(listOf(sphere, plane, leftPlane)) - - val ambient = MaterialColor(0.1f, 0.1f, 0.1f) - - val light = PointLight(Point(1000f, 1000f, -500f), color = MaterialColor(0.5f, 0.5f, 0.5f)) - val specular = 100f - - for (y in 0 until bmp.height) { - for (x in 0 until bmp.width) { - val point = Point(x.toFloat(), y.toFloat(), 0f) - val ray = origin.rayTo(point) - - val hit = scene.intersects(ray) - if (hit != null) { - var color = hit.color * ambient - - val rayToLight = (hit.point + 0.0001f * hit.normal).rayTo(light.point) - if (scene.intersects(rayToLight) == null) { - - val lambert = max(0f, dot(hit.normal, rayToLight.direction)) - color += lambert * light.color - - val h = (-ray.direction + rayToLight.direction).normalized() - - val intensity = dot(hit.normal, h).pow(specular) - - color += intensity * MaterialColor(0.3f, 0f, 0f) - } - - bmp.setPixel(x, y, color.toColor()) - } - } - } - File("test.tga").writeBitmap(bmp) -} diff --git a/src/Bitmap.kt b/src/main/kotlin/Bitmap.kt similarity index 100% rename from src/Bitmap.kt rename to src/main/kotlin/Bitmap.kt diff --git a/src/Point.kt b/src/main/kotlin/Point.kt similarity index 100% rename from src/Point.kt rename to src/main/kotlin/Point.kt diff --git a/src/main/kotlin/Ray.kt b/src/main/kotlin/Ray.kt new file mode 100644 index 0000000..ff45f50 --- /dev/null +++ b/src/main/kotlin/Ray.kt @@ -0,0 +1,190 @@ +import java.io.File +import java.lang.Float.max +import kotlin.math.min +import kotlin.math.pow +import kotlin.math.sqrt + +data class Hit(val point: Point, val normal: Vector, val distance: Float, val material: Material) + +data class MaterialColor(val r: Float, val g: Float, val b: Float) { + fun toColor(): Color = Color( + (r * UByte.MAX_VALUE.toFloat()).toInt().toUByte(), + (g * UByte.MAX_VALUE.toFloat()).toInt().toUByte(), + (b * UByte.MAX_VALUE.toFloat()).toInt().toUByte() + ) + + operator fun times(rhs: MaterialColor) = MaterialColor(r * rhs.r, g * rhs.g, b * rhs.b) + operator fun plus(rhs: MaterialColor) = MaterialColor(r + rhs.r, g + rhs.g, b + rhs.b) + + companion object { + val Black: MaterialColor = MaterialColor(0f, 0f, 0f) + } +} + +operator fun Float.times(rhs: MaterialColor) = MaterialColor(this * rhs.r, this * rhs.g, this * rhs.b) + +data class Ray(val origin: Point, val direction: Vector) { + fun at(t: Float) = origin + t * direction +} + +interface Thing { + fun intersects(ray: Ray): Hit? +} + +interface Material { + fun shade(ray: Ray, hit: Hit, scene: Scene): MaterialColor +} + +data class WhateverMaterial(val color: MaterialColor, + val ambient: MaterialColor = MaterialColor(0.1f, 0.1f, 0.1f), + val specular: Float = 100f +): Material { + override fun shade(ray: Ray, hit: Hit, scene: Scene): MaterialColor { + var color = this.color * ambient + val light = scene.light + val rayToLight = (hit.point + 0.0001f * hit.normal).rayTo(light.point) + if (scene.intersects(rayToLight) == null) { + + val lambert = max(0f, dot(hit.normal, rayToLight.direction)) + color += lambert * light.color + + val h = (-ray.direction + rayToLight.direction).normalized() + + val intensity = dot(hit.normal, h).pow(specular) + + color += intensity * MaterialColor(0.3f, 0f, 0f) + } + + return color + } +} + +data class ReflectiveMaterial( + val reflectivity: Float, + val color: MaterialColor, + val ambient: MaterialColor = MaterialColor(0.1f, 0.1f, 0.1f), + val specular: Float = 10f +): Material { + override fun shade(ray: Ray, hit: Hit, scene: Scene): MaterialColor { + var color = this.color * ambient + val light = scene.light + val offsetPoint = hit.point + 0.0001f * hit.normal + val rayToLight = offsetPoint.rayTo(light.point) + if (scene.intersects(rayToLight) == null) { + + val lambert = max(0f, dot(hit.normal, rayToLight.direction)) + color += lambert * light.color + + val h = (-ray.direction + rayToLight.direction).normalized() + + val intensity = (hit.normal dot h).pow(specular) + + color += intensity * MaterialColor(0.3f, 0f, 0f) + } + + val reflectionDirection = ray.direction - 2 * (ray.direction dot hit.normal) * hit.normal + val reflectedColor = scene.colorForRay(Ray(offsetPoint, reflectionDirection)) ?: MaterialColor.Black + + return (1.0f - reflectivity) * color + reflectivity * reflectedColor + } +} + + +data class Plane(val point: Point, val normal: Vector, val material: Material) : Thing { + override fun intersects(ray: Ray): Hit? { + val bottom = dot(normal, ray.direction) + if (bottom == 0.0f) return null + val t = dot(normal, point - ray.origin) / bottom + if (t <= 0.0f) return null + return Hit(ray.at(t), normal, t, material) + } +} + +data class Sphere(val center: Point, val radius: Float, val material: Material) : Thing { + override fun intersects(ray: Ray): Hit? { + val l = center - ray.origin + val tc = dot(l, ray.direction) + if (tc < 0f) return null + + val d = l.squaredLength - tc * tc + val radiusSquared = radius * radius + + if (d > radiusSquared) return null + + val thc = sqrt(radiusSquared - d) + + val t = min(tc - thc, tc + thc) + + val hitPoint = ray.at(t) + return Hit(hitPoint, (hitPoint - center).normalized(), t, material) + } +} + +fun dot(lhs: Vector, rhs: Vector): Float = lhs.x * rhs.x + lhs.y * rhs.y + lhs.z * rhs.z + +data class PointLight(val point: Point, val color: MaterialColor) + +data class Scene(val things: List, val light: PointLight): Thing { + override fun intersects(ray: Ray): Hit? { + var closest: Hit? = null + for (thing in things) { + val hit = thing.intersects(ray) + if (hit != null && (closest == null || hit.distance < closest.distance)) { + closest = hit + } + } + + return closest + } + + fun colorForRay(ray: Ray): MaterialColor? { + val hit = intersects(ray) + if (hit != null) { + return hit.material.shade(ray, hit, this) + } + return null + } +} + +fun main() { + val bmp = Bitmap(1000, 1000) + val origin = Point(500f, 500f, -500f) + + val sphere = Sphere(Point(500f, 500f, 500f), radius = 500f, material = ReflectiveMaterial(reflectivity = 0.2f, MaterialColor(0f, 1.0f, 0f))) + val sphere2 = Sphere(Point(0f, 500f, 50f), radius = 50f, material = ReflectiveMaterial(reflectivity = 0.2f, MaterialColor(1.0f, 0.0f, 0.1f))) + + val plane = Plane( + Point(0f, -1000f, 0f), + normal = Vector(0f, 1f, 0f), + material = WhateverMaterial(MaterialColor(1f, 0.0f, 0.0f)) + ) + + val leftPlane = Plane( + Point(-1000f, 0f, 0f), + Vector(1f, 0f, 0f), + material = WhateverMaterial(MaterialColor(0.0f, 1f, 0.0f)) + ) + + val light = PointLight(Point(1000f, 1000f, -500f), color = 0.2f * MaterialColor(0.9f, 0.9f, 0.9f)) + + val scene = Scene(listOf( + sphere, + sphere2, + plane, + leftPlane + ), light = light) + + + for (y in 0 until bmp.height) { + for (x in 0 until bmp.width) { + val point = Point(x.toFloat(), y.toFloat(), 0f) + val ray = origin.rayTo(point) + + val color = scene.colorForRay(ray) + if (color != null) { + bmp.setPixel(x, y, color.toColor()) + } + } + } + File("test.tga").writeBitmap(bmp) +} diff --git a/src/Vector.kt b/src/main/kotlin/Vector.kt similarity index 90% rename from src/Vector.kt rename to src/main/kotlin/Vector.kt index a3f3a8f..69753c6 100644 --- a/src/Vector.kt +++ b/src/main/kotlin/Vector.kt @@ -11,6 +11,8 @@ data class Vector(val x: Float, val y: Float, val z: Float) { operator fun unaryMinus(): Vector = Vector(-x, -y, -z) operator fun minus(rhs: Vector): Vector = Vector(x - rhs.x, y - rhs.y, z - rhs.z) operator fun div(rhs: Float): Vector = Vector(x / rhs, y / rhs, z / rhs) + + infix fun dot(rhs: Vector): Float = x * rhs.x + y * rhs.y + z * rhs.z } operator fun Float.times(rhs: Vector): Vector = rhs * this