feat(BasicRatraycingRender): add constructors taking scene or camera

Author: nikitavbv

src/main/java/labs/introtoprogramming/lab5/gui/SceneRendererWindow.java

@@ -20,8 +20,7 @@ public class SceneRendererWindow extends Window {
   private Input input;
 
   public SceneRendererWindow(Scene scene) {
-    this(new BasicRaytracingRender(scene.getCamera().orElseThrow(NoCameraException::new).raster()), scene);
-    setRaster(scene.getCamera().orElseThrow(NoCameraException::new).raster());
+    this(new BasicRaytracingRender(scene), scene);
   }
 
   public SceneRendererWindow(SceneRender render, Scene scene) {

src/main/java/labs/introtoprogramming/lab5/scene/BasicRaytracingRender.java

@@ -10,6 +10,14 @@
 public class BasicRaytracingRender implements SceneRender {
   private Raster raster;
 
+  public BasicRaytracingRender(Scene scene) {
+    this(scene.getCamera().orElseThrow(NoCameraException::new));
+  }
+
+  public BasicRaytracingRender(Camera camera) {
+    this(camera.raster());
+  }
+
   public BasicRaytracingRender(Raster raster) {
     this.raster = raster;
   }