Add support for Chunky 2.4.0, save denoised images in the snapshot di…

…rectory.

src/main/java/de/lemaik/chunky/denoiser/AlbedoRenderer.java

@@ -0,0 +1,55 @@
+package de.lemaik.chunky.denoiser;
+
+import se.llbit.chunky.block.Air;
+import se.llbit.chunky.block.Water;
+import se.llbit.chunky.renderer.PathTracingRenderer;
+import se.llbit.chunky.renderer.WorkerState;
+import se.llbit.chunky.renderer.scene.PreviewRayTracer;
+import se.llbit.chunky.renderer.scene.RayTracer;
+import se.llbit.chunky.renderer.scene.Scene;
+import se.llbit.math.Ray;
+
+public class AlbedoRenderer extends PathTracingRenderer {
+
+  public static final String ID = "ALBEDO";
+
+  public AlbedoRenderer() {
+    super(ID, "Albedo map", "Renderer for albedo maps (used for denoising)",
+        new AlbedoTracer());
+  }
+
+  private static class AlbedoTracer implements RayTracer {
+
+    @Override
+    public void trace(Scene scene, WorkerState state) {
+      Ray ray = state.ray;
+      if (scene.isInWater(ray)) {
+        ray.setCurrentMaterial(Water.INSTANCE, 0);
+      } else {
+        ray.setCurrentMaterial(Air.INSTANCE, 0);
+      }
+
+      while (true) {
+        if (!PreviewRayTracer.nextIntersection(scene, ray)) {
+          if (ray.getPrevMaterial().isWater()) {
+            // set water color to white
+            ray.color.set(1, 1, 1, 1);
+          } else if (ray.depth == 0) {
+            // direct sky hit
+            if (!scene.transparentSky()) {
+              scene.sky().getSkyColorInterpolated(ray);
+            }
+          }
+          // ignore indirect sky hits
+          break;
+        }
+
+        if (ray.getCurrentMaterial() != Air.INSTANCE && ray.color.w > 0.0D) {
+          break;
+        }
+
+        ray.o.scaleAdd(1.0E-4D, ray.d);
+      }
+    }
+  }
+}