improve AABB hit test by adding a range check

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

@@ -55,7 +55,7 @@ public record AABB(@NotNull Vec3 min, @NotNull Vec3 max) {
         return new AABB(Vec3.min(this.min, box.min), Vec3.max(this.max, box.max));
     }
 
-    public boolean hit(@NotNull Ray ray) {
+    public boolean hit(@NotNull Ray ray, @NotNull Range range) {
         var origin = ray.origin();
         var direction = ray.direction();
         var invDirection = direction.inv();
@@ -82,7 +82,7 @@ public record AABB(@NotNull Vec3 min, @NotNull Vec3 max) {
             }
         }
 
-        return tlmax < tumin;
+        return tlmax < tumin && tumin >= range.min() && tlmax <= range.max();
     }
 
     public static double @NotNull[] intersect(@NotNull Vec3 corner, @NotNull Vec3 origin, @NotNull Vec3 invDirection) {

src/main/java/eu/jonahbauer/raytracing/scene/hittable3d/Box.java

@@ -61,9 +61,12 @@ public record Box(@NotNull AABB box, @NotNull Material material) implements Hitt
             }
         }
 
-        if (tlmax >= tumin) return Optional.empty();
-        assert entry != null && exit != null;
-        return hit0(tlmax, tumin, entry, exit, ray, range);
+        if (tlmax < tumin && tumin >= range.min() && tlmax <= range.max()) {
+            assert entry != null && exit != null;
+            return hit0(tlmax, tumin, entry, exit, ray, range);
+        } else {
+            return Optional.empty();
+        }
     }
 
     private @NotNull Optional<HitResult> hit0(double tmin, double tmax, @NotNull Side entry, @NotNull Side exit, @NotNull Ray ray, @NotNull Range range) {

src/main/java/eu/jonahbauer/raytracing/scene/util/HittableBinaryTree.java

@@ -47,7 +47,7 @@ public final class HittableBinaryTree extends HittableCollection {
 
     @Override
     public void hit(@NotNull Ray ray, @NotNull State state) {
-        if (!bbox.hit(ray)) return;
+        if (!bbox.hit(ray, state.getRange())) return;
         if (left instanceof HittableCollection coll) {
             coll.hit(ray, state);
         } else if (left != null) {

src/main/java/eu/jonahbauer/raytracing/scene/util/HittableCollection.java

@@ -41,6 +41,10 @@ public abstract class HittableCollection implements Hittable {
             this.range = Objects.requireNonNull(range);
         }
 
+        public @NotNull Range getRange() {
+            return range;
+        }
+
         private @NotNull Optional<HitResult> getResult() {
             return Optional.ofNullable(result);
         }