more rename

com.unity.ml-agents.extensions/Editor/GridSensorComponentEditor.cs

                 EditorGUILayout.PropertyField(so.FindProperty(nameof(GridSensorComponent.m_DepthType)), true);
 
                 // channel depth
-                var channelDepth = so.FindProperty(nameof(GridSensorComponent.m_ChannelDepth));
+                var channelDepth = so.FindProperty(nameof(GridSensorComponent.m_ChannelDepths));
                 var newDepth = EditorGUILayout.IntField("Channel Depth", channelDepth.arraySize);
                 if (newDepth != channelDepth.arraySize)
                 {
                 EditorGUILayout.PropertyField(so.FindProperty(nameof(GridSensorComponent.m_InitialColliderBufferSize)), true);
             }
             EditorGUI.EndDisabledGroup();
-            EditorGUILayout.PropertyField(so.FindProperty(nameof(GridSensorComponent.m_ObserveMask)), true);
+            EditorGUILayout.PropertyField(so.FindProperty(nameof(GridSensorComponent.m_ColliderMask)), true);
             EditorGUI.BeginDisabledGroup(!EditorUtilities.CanUpdateModelProperties());
             {
                 EditorGUILayout.LabelField("Sensor Settings", EditorStyles.boldLabel);

com.unity.ml-agents.extensions/Runtime/Sensors/GridSensorComponent.cs

         }
 
         [HideInInspector, SerializeField]
-        internal int[] m_ChannelDepth = new int[] { 1 };
+        internal int[] m_ChannelDepths = new int[] { 1 };
-        public int[] ChannelDepth
+        public int[] ChannelDepths
-            get { return m_ChannelDepth; }
-            set { m_ChannelDepth = value; }
+            get { return m_ChannelDepths; }
+            set { m_ChannelDepths = value; }
         }
 
         [HideInInspector, SerializeField]
         }
 
         [HideInInspector, SerializeField]
-        internal LayerMask m_ObserveMask;
+        internal LayerMask m_ColliderMask;
-        public LayerMask ObserveMask
+        public LayerMask ColliderMask
-            get { return m_ObserveMask; }
-            set { m_ObserveMask = value; }
+            get { return m_ColliderMask; }
+            set { m_ColliderMask = value; }
         }
 
         [HideInInspector, SerializeField]
                 m_CellScale,
                 m_GridNum,
                 m_RotateWithAgent,
-                m_ChannelDepth,
+                m_ChannelDepths,
-                m_ObserveMask,
+                m_ColliderMask,
                 m_DepthType,
                 RootReference,
                 m_CompressionType,

com.unity.ml-agents.extensions/Tests/Editor/Sensors/GridSensorTestUtils.cs

         }
 
         public static void SetComponentParameters(GridSensorComponent gridComponent, string[] detectableObjects, int[] channelDepth, GridDepthType gridDepthType,
-            float cellScaleX, float cellScaleZ, int gridWidth, int gridHeight, int observeMaskInt, bool rotateWithAgent, Color[] debugColors)
+            float cellScaleX, float cellScaleZ, int gridWidth, int gridHeight, int colliderMaskInt, bool rotateWithAgent, Color[] debugColors)
-            gridComponent.ChannelDepth = channelDepth;
+            gridComponent.ChannelDepths = channelDepth;
-            gridComponent.ObserveMask = observeMaskInt;
+            gridComponent.ColliderMask = colliderMaskInt;
             gridComponent.RotateWithAgent = rotateWithAgent;
             gridComponent.DebugColors = debugColors;
         }

com.unity.ml-agents.extensions/Tests/Utils/GridObsTestComponents/SimpleTestGridSensor.cs

                 CellScale,
                 GridNum,
                 RotateWithAgent,
-                ChannelDepth,
+                ChannelDepths,
-                ObserveMask,
+                ColliderMask,
                 DepthType,
                 RootReference,
                 CompressionType,