add "final" scene

src/main/java/eu/jonahbauer/raytracing/Main.java

@@ -2,6 +2,7 @@ package eu.jonahbauer.raytracing;
 
 import eu.jonahbauer.raytracing.material.DielectricMaterial;
 import eu.jonahbauer.raytracing.material.LambertianMaterial;
+import eu.jonahbauer.raytracing.material.Material;
 import eu.jonahbauer.raytracing.material.MetallicMaterial;
 import eu.jonahbauer.raytracing.math.Vec3;
 import eu.jonahbauer.raytracing.render.Camera;
@@ -9,29 +10,28 @@ import eu.jonahbauer.raytracing.render.Color;
 import eu.jonahbauer.raytracing.render.ImageFormat;
 import eu.jonahbauer.raytracing.render.canvas.LiveCanvas;
 import eu.jonahbauer.raytracing.render.canvas.Image;
+import eu.jonahbauer.raytracing.scene.Hittable;
 import eu.jonahbauer.raytracing.scene.Scene;
 import eu.jonahbauer.raytracing.scene.Sphere;
+import org.jetbrains.annotations.NotNull;
 
 import java.io.IOException;
 import java.nio.file.Path;
+import java.util.ArrayList;
 
 public class Main {
     public static void main(String[] args) throws IOException {
-        var scene = new Scene(
+        var scene = getScene();
-                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 DielectricMaterial(1.5)),
-                new Sphere(-1, 0, - 1, 0.4, new DielectricMaterial(1 / 1.5)),
-                new Sphere(1, 0, - 1, 0.5, new MetallicMaterial(new Color(0.8, 0.6, 0.2), 1.0))
-        );
 
         var camera = Camera.builder()
-                .withImage(800, 450)
+                .withImage(1200, 675)
-                .withPosition(new Vec3(-2, 2, 1))
+                .withPosition(new Vec3(13, 2, 3))
-                .withTarget(new Vec3(0, 0, -1))
+                .withTarget(new Vec3(0, 0, 0))
                 .withFieldOfView(Math.toRadians(20))
-                .withFocusDistance(3.4)
+                .withFocusDistance(10.0)
-                .withBlurAngle(Math.toRadians(10))
+                .withBlurAngle(Math.toRadians(0.6))
+                .withSamplesPerPixel(500)
+                .withMaxDepth(50)
                 .build();
 
         var image = new LiveCanvas(new Image(camera.getWidth(), camera.getHeight()));
@@ -40,4 +40,40 @@ public class Main {
         camera.render(scene, image);
         ImageFormat.PNG.write(image, Path.of("scene-" + System.currentTimeMillis() + ".png"));
     }
+
+    private static @NotNull Scene getScene() {
+        var objects = new ArrayList<Hittable>();
+        objects.add(new Sphere(new Vec3(0, -1000, 0), 1000, new LambertianMaterial(new Color(0.5, 0.5, 0.5))));
+
+        for (int a = -11; a < 11; a++) {
+            for (int b = -11; b < 11; b++) {
+                var center = new Vec3(a + 0.9 * Math.random(), 0.2, b + 0.9 * Math.random());
+                if (Vec3.distance(center, new Vec3(4, 0.2, 0)) <= 0.9) continue;
+
+                Material material;
+                var rnd = Math.random();
+                if (rnd < 0.8) {
+                    // diffuse
+                    var albedo = Color.multiply(Color.random(), Color.random());
+                    material = new LambertianMaterial(albedo);
+                } else if (rnd < 0.95) {
+                    // metal
+                    var albedo = Color.random(0.5, 1.0);
+                    var fuzz = Math.random() * 0.5;
+                    material = new MetallicMaterial(albedo, fuzz);
+                } else {
+                    // glass
+                    material = new DielectricMaterial(1.5);
+                }
+
+                objects.add(new Sphere(center, 0.2, material));
+            }
+        }
+
+        objects.add(new Sphere(new Vec3(0, 1, 0), 1.0, new DielectricMaterial(1.5)));
+        objects.add(new Sphere(new Vec3(-4, 1, 0), 1.0, new LambertianMaterial(new Color(0.4, 0.2, 0.1))));
+        objects.add(new Sphere(new Vec3(4, 1, 0), 1.0, new MetallicMaterial(new Color(0.7, 0.6, 0.5))));
+
+        return new Scene(objects);
+    }
 }

src/main/java/eu/jonahbauer/raytracing/math/Vec3.java

@@ -50,6 +50,10 @@ public record Vec3(double x, double y, double z) {
         return vec.plus(vxp.times(Math.sin(angle))).plus(vxvxp.times(1 - Math.cos(angle)));
     }
 
+    public static double distance(@NotNull Vec3 a, @NotNull Vec3 b) {
+        return a.minus(b).length();
+    }
+
     public @NotNull Vec3 plus(@NotNull Vec3 b) {
         return new Vec3(this.x + b.x, this.y + b.y, this.z + b.z);
     }

src/main/java/eu/jonahbauer/raytracing/render/Color.java

@@ -24,6 +24,19 @@ public record Color(double r, double g, double b) {
         return new Color(a.r() * b.r(), a.g() * b.g(), a.b() * b.b());
     }
 
+    public static @NotNull Color random() {
+        return new Color(Math.random(), Math.random(), Math.random());
+    }
+
+    public static @NotNull Color random(double min, double max) {
+        var span = max - min;
+        return new Color(
+                Math.fma(Math.random(), span, min),
+                Math.fma(Math.random(), span, min),
+                Math.fma(Math.random(), span, min)
+        );
+    }
+
     public Color {
         if (r < 0 || r > 1 || g < 0 || g > 1 || b < 0 || b > 1) {
             throw new IllegalArgumentException("r, g and b must be in the range 0 to 1");