From a41b14da48804c943eab4bc309b6eb477613ecfc Mon Sep 17 00:00:00 2001
From: jbb01 <32650546+jbb01@users.noreply.github.com>
Date: Sat, 3 Aug 2024 21:28:43 +0200
Subject: [PATCH] add metal

---
 .../java/eu/jonahbauer/raytracing/Main.java   |  7 ++++--
 .../raytracing/material/MetallicMaterial.java | 23 +++++++++++++++++++
 2 files changed, 28 insertions(+), 2 deletions(-)
 create mode 100644 src/main/java/eu/jonahbauer/raytracing/material/MetallicMaterial.java

diff --git a/src/main/java/eu/jonahbauer/raytracing/Main.java b/src/main/java/eu/jonahbauer/raytracing/Main.java
index 725228a..32d72ba 100644
--- a/src/main/java/eu/jonahbauer/raytracing/Main.java
+++ b/src/main/java/eu/jonahbauer/raytracing/Main.java
@@ -1,6 +1,7 @@
 package eu.jonahbauer.raytracing;
 
 import eu.jonahbauer.raytracing.material.LambertianMaterial;
+import eu.jonahbauer.raytracing.material.MetallicMaterial;
 import eu.jonahbauer.raytracing.render.Camera;
 import eu.jonahbauer.raytracing.render.Color;
 import eu.jonahbauer.raytracing.render.ImageFormat;
@@ -13,8 +14,10 @@ import java.nio.file.Path;
 public class Main {
     public static void main(String[] args) throws IOException {
         var scene = new Scene(
-                new Sphere(0, 0, 1, 0.5, new LambertianMaterial(Color.RED)),
-                new Sphere(0, -100.5, 1, 100, new LambertianMaterial(Color.BLUE))
+                new Sphere(0, -100.5, 1, 100, new LambertianMaterial(new Color(0.8, 0.8, 0.0))),
+                new Sphere(0, 0, 1.2, 0.5, new LambertianMaterial(new Color(0.1, 0.2, 0.5))),
+                new Sphere(-1, 0, 1, 0.5, new MetallicMaterial(new Color(0.8, 0.8, 0.8))),
+                new Sphere(1, 0, 1, 0.5, new MetallicMaterial(new Color(0.8, 0.6, 0.2)))
         );
         var camera = new Camera(512, 2, 16 / 9d);
 
diff --git a/src/main/java/eu/jonahbauer/raytracing/material/MetallicMaterial.java b/src/main/java/eu/jonahbauer/raytracing/material/MetallicMaterial.java
new file mode 100644
index 0000000..f2fd97c
--- /dev/null
+++ b/src/main/java/eu/jonahbauer/raytracing/material/MetallicMaterial.java
@@ -0,0 +1,23 @@
+package eu.jonahbauer.raytracing.material;
+
+import eu.jonahbauer.raytracing.math.Ray;
+import eu.jonahbauer.raytracing.render.Color;
+import eu.jonahbauer.raytracing.scene.HitResult;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.Objects;
+import java.util.Optional;
+
+public record MetallicMaterial(@NotNull Color albedo) implements Material {
+    public MetallicMaterial {
+        Objects.requireNonNull(albedo, "albedo");
+    }
+
+    @Override
+    public @NotNull Optional<ScatterResult> scatter(@NotNull Ray ray, @NotNull HitResult hit) {
+        var direction = ray.direction();
+        var normal = hit.normal();
+        var newDirection = direction.minus(normal.times(2 * normal.times(direction)));
+        return Optional.of(new ScatterResult(new Ray(hit.position(), newDirection), albedo));
+    }
+}