Added interaction, hand, rigidbody dragging, picking up hammer

Assets/Plugins/Interaction/Runtime/Core/InteractableUtils.cs

@@ -0,0 +1,36 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace Nothke.Interaction
+{
+    public static class InteractableUtils
+    {
+
+        public static Vector3 GetMousePointOnPlane(Plane plane)
+        {
+            Vector3 screenPoint = Input.mousePosition;
+
+            Ray screenRay = Camera.main.ScreenPointToRay(Input.mousePosition);
+
+            float e = 0;
+            if (plane.Raycast(screenRay, out e))
+                screenPoint.z = e;
+
+            return screenRay.GetPoint(e);
+        }
+
+        public static Vector3 GetJointAnchorInWorldSpace(Joint joint)
+        {
+            if (!joint.connectedBody) return joint.connectedAnchor;
+
+            return joint.connectedBody.transform.TransformPoint(joint.connectedAnchor);
+        }
+
+        public static bool IsNonUniform(this Transform transform)
+        {
+            Vector3 ls = transform.lossyScale;
+            return !(Mathf.Approximately(ls.x, ls.y) && Mathf.Approximately(ls.y, ls.z));
+        }
+    }
+}