update

script_camera_lerp/README.md

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+Use keys `A` and `D` to rotate the cube.  
+The camera follows the cube smoothly with interpolation.

script_camera_lerp/Sources/lnx/CameraTrait.hx

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+package lnx;
+
+import iron.object.Object;
+import iron.Scene;
+import iron.math.Quat;
+
+class CameraTrait extends iron.Trait {
+	
+	var cube:Object;
+	
+	public function new() {
+		super();
+
+		notifyOnInit(function() {
+			cube = Scene.active.getChild("Cube");
+		});
+
+		notifyOnUpdate(function() {
+			if(cube.transform.rot != object.transform.rot){
+				var newRot = new Quat().lerp(cube.transform.rot, object.transform.rot, 0.9);
+				object.transform.rot.setFrom(newRot);
+				object.transform.buildMatrix();
+			}
+		});
+	}
+}

script_camera_lerp/Sources/lnx/MyTrait.hx

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+package lnx;
+
+import iron.system.Input;
+import iron.math.Vec4;
+import iron.system.Time;
+
+class MyTrait extends iron.Trait {
+	public function new() {
+		super();
+
+		notifyOnUpdate(function() {
+
+			var kb = Input.getKeyboard();
+
+			if(kb.down("a") || kb.down("left")){
+				object.transform.rotate(new Vec4(0,0,1), -3 * Time.delta);
+			} else if(kb.down("d") || kb.down("right")){
+				object.transform.rotate(new Vec4(0,0,1), 3 * Time.delta);
+			}
+
+		});
+	}
+}