made 3d models position themselves in center of UIObjectCamera's view so it does not go outside its field of view

Assets/RothenburgAR/Scripts/UI/DetailsModelBehaviour.cs

@@ -23,7 +23,7 @@ namespace RothenburgAR.UI
 
         void FixedUpdate()
         {
-            if (_autoRotate == true)
+            if (_autoRotate == true && CurrentModel != null)
             {
                 NormalizeRotationSpeed();
                 CurrentModel.transform.Rotate(Vector3.up, _rotationSpeed);

Assets/RothenburgAR/Scripts/UI/DetailsPanelBehaviour.cs

@@ -28,7 +28,6 @@ namespace RothenburgAR.UI
             get { return _currentDisplayedModelGo != null; }
         }
 
-        private string modelToBeDisplayed = null;
         private GameObject _currentDisplayedModelGo;
 
         public void SetText(TextElement el)
@@ -53,8 +52,6 @@ namespace RothenburgAR.UI
 
         public IEnumerator SetModelCoroutine(PoiData data)
         {
-            modelToBeDisplayed = data.ID;
-
             if (!data.IsModelLoaded)
             {
                 StartCoroutine(data.LoadModel());
@@ -74,21 +71,31 @@ namespace RothenburgAR.UI
 
             try
             {
-                if (modelToBeDisplayed == data.ID)
+                SetModel(data.InstantiateModelPrefab());
-                    SetModel(data.InstantiateModelPrefab());
             }
             catch (Exception)
             {
                 // ignore, just do not display an object
-                _currentDisplayedModelGo = null;
+                RemoveModel();
-                modelToBeDisplayed = null;
             }
         }
 
         public void SetModel(GameObject modelGo)
         {
             modelGo.transform.SetParent(UIManager.Instance.UIObjectCamera.transform, false);
-            modelGo.transform.localPosition += new Vector3(0, 0, 450);
+
+            var meshFilter = modelGo.GetComponentInChildren<MeshFilter>();
+            if (meshFilter == null) throw new Exception("No MeshFilter in Object!");
+
+            var mesh = meshFilter.mesh;
+            if (mesh == null) throw new Exception("No Mesh in Model!");
+
+            //TODO remove when model metadata rotation is no longer a thing
+            mesh.RecalculateBounds();
+
+            var scale = 1f / Mathf.Max(mesh.bounds.size.x, mesh.bounds.size.y, mesh.bounds.size.z);
+            modelGo.transform.localScale = new Vector3(scale, scale, scale);
+            modelGo.transform.localPosition = mesh.bounds.center * scale + new Vector3(0, 0, 1.8f);
 
             _currentDisplayedModelGo = modelGo;
             DetailsModel.CurrentModel = _currentDisplayedModelGo;
@@ -102,7 +109,7 @@ namespace RothenburgAR.UI
         {
             DetailsModel.gameObject.SetActive(false);
             DetailsModel.CurrentModel = null;
-            modelToBeDisplayed = null;
+
             if (HasModel)
             {
                 Destroy(_currentDisplayedModelGo);