гигантский ассет

Assets/ThunderWire Studio/UHFPS/Content/Scripts/Runtime/Misc/RigidbodyParenter.cs

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+using System.Collections.Generic;
+using ThunderWire.Attributes;
+using UnityEngine;
+
+namespace UHFPS.Runtime
+{
+    [InspectorHeader("Rigidbody Parenter")]
+    [HelpBox("Attach this component to a movable object to which interactable objects should be parented. Allowed objects are only DraggableItem or InteractableItem.")]
+    public class RigidbodyParenter : MonoBehaviour
+    {
+        public List<GameObject> ParentedObjects = new();
+        public bool FlipUP = false;
+
+        private void OnCollisionStay(Collision collision)
+        {
+            TryParentObject(collision);
+        }
+
+        private void OnCollisionExit(Collision collision)
+        {
+            if (ParentedObjects.Contains(collision.gameObject))
+            {
+                if (collision.transform.parent == transform)
+                {
+                    ParentedObjects.Remove(collision.gameObject);
+                    collision.transform.SetParent(null);
+                }
+            }
+        }
+
+        private void TryParentObject(Collision collision)
+        {
+            if (collision.transform.parent == transform)
+                return;
+
+            if (collision.gameObject.TryGetComponent<DraggableItem>(out _)
+                || collision.gameObject.TryGetComponent<InteractableItem>(out _))
+            {
+                // check if the collision object is on top
+                foreach (ContactPoint contact in collision.contacts)
+                {
+                    float dot = Vector3.Dot(contact.normal, Vector3.up);
+                    if (FlipUP ? (dot > 0.9f) : (dot < -0.9f))
+                    {
+                        if (!ParentedObjects.Contains(collision.gameObject))
+                            ParentedObjects.Add(collision.gameObject);
+
+                        collision.transform.SetParent(transform);
+                        break;
+                    }
+                }
+            }
+        }
+    }
+}