Fixing issue #35 - SurfaceObserver not starting

Adds the Start() method back to SpatialMappingManager, which was
accidentally removed during the last update. This method is repsonsible
for starting the SurfaceObserver.
Also fixed: the RecalculateNormals was no longer present in
SpatialMappingObserver.cs. This call is required when using shaders
(like 'BlueLinesOnWalls') that rely on surface mesh normals being
correct.

Completed/Planetarium/Assets/HoloToolkit-SpatialMapping-230/SpatialMapping/Scripts/SpatialMappingManager.cs

@@ -31,6 +31,9 @@ public partial class SpatialMappingManager : Singleton<SpatialMappingManager>
         [Tooltip("Determines if spatial mapping data will cast shadows.")]
         public bool castShadows = false;
 
+        [Tooltip("Determines if the surface observer should be automatically started.")]
+        public bool autoStartObserver = true;
+
         /// <summary>
         /// Used for gathering real-time Spatial Mapping data on the HoloLens.
         /// </summary>
@@ -54,6 +57,14 @@ protected void Awake()
             Source = surfaceObserver;
         }
 
+        private void Start()
+        {
+            if(autoStartObserver)
+            {
+                StartObserver();
+            }
+        }
+
         /// <summary>
         /// Returns the layer as a bit mask.
         /// </summary>

Completed/Planetarium/Assets/HoloToolkit-SpatialMapping-230/SpatialMapping/Scripts/SpatialMappingObserver.cs

@@ -38,6 +38,9 @@ public class SpatialMappingObserver : SpatialMappingSource
         [Tooltip("How long to wait (in sec) between Spatial Mapping updates.")]
         public float TimeBetweenUpdates = 3.5f;
 
+        [Tooltip("Recalculates normals whenever a mesh is updated.")]
+        public bool RecalculateNormals = false;
+
         /// <summary>
         /// Event for hooking when surfaces are changed.
         /// </summary>
@@ -241,6 +244,15 @@ private void SurfaceObserver_OnDataReady(SurfaceData cookedData, bool outputWrit
                 renderer.sharedMaterial = SpatialMappingManager.Instance.SurfaceMaterial;
                 renderer.enabled = SpatialMappingManager.Instance.DrawVisualMeshes;
 
+                if (RecalculateNormals)
+                {
+                    MeshFilter filter = surface.GetComponent<MeshFilter>();
+                    if(filter != null && filter.sharedMesh != null)
+                    {
+                        filter.sharedMesh.RecalculateNormals();
+                    }
+                }
+
                 if (SpatialMappingManager.Instance.CastShadows == false)
                 {
                     renderer.shadowCastingMode = UnityEngine.Rendering.ShadowCastingMode.Off;