Added wal texutre & minor improvements

Unity/TouchSensor.cs

@@ -16,6 +16,8 @@ namespace RoboidControl.Unity {
 			get => (RoboidControl.TouchSensor)base.core;
 		}
 
+		SphereCollider collider = null;
+
 		/// <summary>
 		/// Start the Unity represention
 		/// </summary>
@@ -24,6 +26,7 @@ namespace RoboidControl.Unity {
 				participant = FindAnyObjectByType<SiteServer>();
 				SetCoreThing(new RoboidControl.TouchSensor(participant.site));
 			}
+			collider = GetComponent<SphereCollider>();
 		}
 
 		/// <summary>
@@ -42,7 +45,7 @@ namespace RoboidControl.Unity {
 			rb.isKinematic = true;
 
 			SphereCollider collider = gameObj.AddComponent<SphereCollider>();
-			collider.radius = 0.02f;
+			collider.radius = 0.01f;
 			collider.isTrigger = true;
 
 			if (gameObj.transform.parent != null && gameObj.transform.localPosition.magnitude > 0) {
@@ -53,6 +56,16 @@ namespace RoboidControl.Unity {
 			return component;
 		}
 
+		protected override void Update() {
+			base.Update();
+			if (collider.radius == 0.01f &&
+				this.transform.parent != null && this.transform.localPosition.magnitude > 0
+			) {
+				collider.radius = Vector3.Distance(this.transform.position, this.transform.parent.position) / 2;
+				this.transform.position = (this.transform.position + this.transform.parent.position) / 2;
+			}
+		}
+
 		private void OnTriggerEnter(Collider other) {
 			Debug.Log("Touch?");
 			if (other.isTrigger) {

src/Things/TouchSensor.cs

@@ -37,9 +37,9 @@ namespace RoboidControl {
             get { return _touchedSomething; }
             set {
                 if (_touchedSomething != value) {
-                    touchUpdated = true;
                     _touchedSomething = value;
                 }
+                touchUpdated = true;
             }
         }
         private bool touchUpdated = false;