Initial Unity prototype

Assets/Scripts/PlayerGrabber.cs

@@ -0,0 +1,44 @@
+using UnityEngine;
+
+public class PlayerGrabber : MonoBehaviour
+{
+    public float grabDistance = 2f;
+    private CartGrabAndHold heldCart;
+
+    void Update()
+    {
+        if (Input.GetKeyDown(KeyCode.E))
+        {
+            if (heldCart == null)
+            {
+                TryGrabCart();
+            }
+            else
+            {
+                heldCart.ReleaseCart();
+                heldCart = null;
+            }
+        }
+
+        if (heldCart != null)
+        {
+            heldCart.HoldCart();  // Let it keep following while held
+        }
+    }
+
+    void TryGrabCart()
+    {
+        Ray ray = new Ray(transform.position, transform.forward);
+        RaycastHit hit;
+
+        if (Physics.Raycast(ray, out hit, grabDistance))
+        {
+            CartGrabAndHold cart = hit.collider.GetComponent<CartGrabAndHold>();
+            if (cart != null)
+            {
+                heldCart = cart;
+                cart.GrabCart(transform);
+            }
+        }
+    }
+}