get All of a type from scene

src/main/java/xyz/valnet/engine/scenegraph/GameObject.java

@@ -1,5 +1,7 @@
 package xyz.valnet.engine.scenegraph;
 
+import java.util.List;
+
 import xyz.valnet.hadean.scenes.GameScene;
 
 public class GameObject implements IRenderable, ITickable {
@@ -13,6 +15,10 @@ public class GameObject implements IRenderable, ITickable {
     return this.scene.get(clazz);
   }
 
+  protected <T> List<T> getAll(Class<T> clazz) {
+    return this.scene.getAll(clazz);
+  }
+
   protected final void add(GameObject obj) {
     scene.add(obj);
   }

src/main/java/xyz/valnet/hadean/scenes/GameScene.java

@@ -7,6 +7,8 @@ import xyz.valnet.engine.scenegraph.GameObject;
 import xyz.valnet.engine.scenegraph.IScene;
 import xyz.valnet.hadean.gameobjects.Camera;
 import xyz.valnet.hadean.gameobjects.Pawn;
+import xyz.valnet.hadean.gameobjects.Selection;
+import xyz.valnet.hadean.gameobjects.SelectionUI;
 import xyz.valnet.hadean.gameobjects.Terrain;
 
 public class GameScene implements IScene {
@@ -27,6 +29,16 @@ public class GameScene implements IScene {
     return null;
   }
 
+  public <T> List<T> getAll(Class<T> clazz) {
+    List<T> stuff = new ArrayList<T>();
+    for(GameObject obj : objects) {
+      if(clazz.isInstance(obj)) {
+        stuff.add(clazz.cast(obj));
+      }
+    }
+    return stuff;
+  }
+
   @Override
   public void render() {
     for(GameObject obj : objects) {