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physics_pick/README.md

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+Example on physics-based picking.  
+Object to be picked is required to have rigid body enabled.  
+Click on a cube to make it jump.  
+Select Camera object, go to `Properties - Object - Leenkx Traits` and enable one of the traits you wish to test:
+- PickTrait - using scripting
+- PickEvent - using scripting with mouse event
+- PickTree - using logic nodes
+

physics_pick/Sources/lnx/PickEvent.hx

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+package lnx;
+
+import kha.input.Mouse;
+import leenkx.trait.physics.PhysicsWorld;
+
+// Using mouse events
+class PickEvent extends iron.Trait {
+
+	public function new() {
+		super();
+
+		notifyOnInit(function() {
+			Mouse.get().notify(onMouseDown, onMouseUp, onMouseMove, onMouseWheel);
+		});
+
+		notifyOnRemove(function() {
+			// Trait or its object is removed, remove event listeners
+			Mouse.get().remove(onMouseDown, onMouseUp, onMouseMove, onMouseWheel);
+		});
+	}
+
+	function onMouseDown(button: Int, x: Int, y: Int) {
+		// Pick object at mouse coords
+		var rb = PhysicsWorld.active.pickClosest(x, y);
+		
+		// Check if picked object is our Cube
+		if (rb != null && rb.object.name == 'Cube') {
+			rb.object.transform.translate(0, 0, 1);
+			rb.syncTransform();
+		}
+	}
+
+	function onMouseUp(button: Int, x: Int, y: Int) { }
+	function onMouseMove(x: Int, y: Int, movementX: Int, movementY: Int) { }
+	function onMouseWheel(delta: Int) { }
+}

physics_pick/Sources/lnx/PickTrait.hx

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+package lnx;
+
+import iron.system.Input;
+import leenkx.trait.physics.PhysicsWorld;
+
+class PickTrait extends iron.Trait {
+
+	public function new() {
+		super();
+
+        notifyOnUpdate(function() {
+            // Check mouse button
+            var mouse = Input.getMouse();
+            if (!mouse.started()) return;
+
+            // Pick object at mouse coords
+            var rb = PhysicsWorld.active.pickClosest(mouse.x, mouse.y);
+            
+            // Check if picked object is our Cube
+            if (rb != null && rb.object.name == 'Cube') {
+                rb.object.transform.translate(0, 0, 1);
+                rb.syncTransform();
+            }
+        });
+	}
+}