add color to DielectricMaterial

README.md

@@ -31,4 +31,12 @@ java -jar raytracing.jar --samples 50000 --height 1200 CORNELL
 
 ```
 java -jar raytracing.jar --samples 50000 --height 600 CORNELL_SMOKE
+```
+
+### diagramm
+
+![](./docs/diagramm.png)
+
+```
+java -jar raytracing.jar --samples 1000 --height 1080 DIAGRAMM
 ```

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

@@ -30,6 +30,7 @@ public class Examples {
         register("LIGHT", Examples::getLight);
         register("CORNELL", Examples::getCornellBox);
         register("CORNELL_SMOKE", Examples::getCornellBoxSmoke);
+        register("DIAGRAMM", Examples::getDiagramm);
     }
 
     public static @NotNull IntFunction<Example> getByName(@NotNull String name) {
@@ -202,6 +203,54 @@ public class Examples {
         );
     }
 
+    public static @NotNull Example getDiagramm(int height) {
+        if (height <= 0) height = 450;
+
+        record Partei(String name, Color color, double stimmen) { }
+        var data = List.of(
+                new Partei("CDU", new Color(0x00, 0x4B, 0x76), 18.9),
+                new Partei("SPD", new Color(0xC0, 0x00, 0x3C), 25.7),
+                new Partei("AfD", new Color(0x80, 0xCD, 0xEC), 10.3),
+                new Partei("FDP", new Color(0xF7, 0xBB, 0x3D), 11.5),
+                new Partei("DIE LINKE", new Color(0x5F, 0x31, 0x6E), 4.9),
+                new Partei("GRÜNE", new Color(0x00, 0x85, 0x4A), 14.8),
+                new Partei("CSU", new Color(0x00, 0x77, 0xB6), 5.2)
+        );
+        var white = new LambertianMaterial(new Color(.99, .99, .99));
+
+        var count = data.size();
+        var size = 75d;
+        var spacing = 50d;
+
+        var x = (count + 1) * spacing + count * size + 1000;
+        var y = 500 + 1000;
+        var z = 2 * spacing + size + 1000;
+
+        var objects = new ArrayList<Hittable>();
+        objects.add(new Parallelogram(new Vec3(0, 0, 0), new Vec3(x, 0, 0), new Vec3(0, y, 0), white));
+        objects.add(new Parallelogram(new Vec3(0, 0, 0), new Vec3(0, 0, z), new Vec3(x, 0, 0), white));
+        objects.add(new Parallelogram(new Vec3(0, 0, 0), new Vec3(0, y, 0), new Vec3(0, 0, z), white));
+
+        for (int i = 0; i < data.size(); i++) {
+            var partei = data.get(i);
+            objects.add(Hittables.box(
+                    new Vec3((i + 1) * spacing +       i * size, 0, spacing),
+                    new Vec3((i + 1) * spacing + (i + 1) * size, partei.stimmen() * 15, spacing + size),
+                    new DielectricMaterial(1.5, partei.color())
+            ));
+        }
+
+        return new Example(
+                new Scene(new Color(1.25, 1.25, 1.25), objects),
+                SimpleCamera.builder()
+                        .withImage(height * 16 / 9, height)
+                        .withPosition(new Vec3(700, 250, 800))
+                        .withTarget(new Vec3(500, 200, 0))
+                        .withFieldOfView(Math.toRadians(40))
+                        .build()
+        );
+    }
+
     private static @NotNull SkyBox getSkyBox() {
         return SkyBox.gradient(new Color(0.5, 0.7, 1.0), Color.WHITE);
     }

src/main/java/eu/jonahbauer/raytracing/render/material/DielectricMaterial.java

@@ -6,9 +6,18 @@ 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 DielectricMaterial(double refractionIndex) implements Material {
+public record DielectricMaterial(double refractionIndex, @NotNull Color albedo) implements Material {
+    public DielectricMaterial(double refractionIndex) {
+        this(refractionIndex, Color.WHITE);
+    }
+
+    public DielectricMaterial {
+        Objects.requireNonNull(albedo, "albedo");
+    }
+
     @Override
     public @NotNull Optional<ScatterResult> scatter(@NotNull Ray ray, @NotNull HitResult hit) {
         var ri = hit.frontFace() ? (1 / refractionIndex) : refractionIndex;
@@ -20,7 +29,7 @@ public record DielectricMaterial(double refractionIndex) implements Material {
         var newDirection = (reflect ? Optional.<Vec3>empty() : Vec3.refract(ray.direction(), hit.normal(), ri))
                 .orElseGet(() -> Vec3.reflect(ray.direction(), hit.normal()));
 
-        return Optional.of(new ScatterResult(new Ray(hit.position(), newDirection), Color.WHITE));
+        return Optional.of(new ScatterResult(new Ray(hit.position(), newDirection), albedo));
     }
 
     private double reflectance(double cos) {