Update SpatialProcessingSurfaceMagnetism.md

Author: cre8ivepark

Assets/HoloToolkit-Examples/SpatialMapping/SpatialProcessingSurfaceMagnetism.md

@@ -12,15 +12,17 @@ https://gfycat.com/PitifulRareKodiakbear
 ## How to use 
 You need to assign same Unity layer to the Spatial mapping’s plane and Solver Surface Magnetism’s Magnetic Surface.
 
-1. Add a new layer for the planes created by Spatial Processing. (to snap to) This example shows a new layer named ‘SpatialProcessingPlane’
+1. Add a new layer for the planes created by Spatial Processing. Mixed Reality Toolkit's Apply Mixed Reality Projcet Settings automatically addes a new layer 31:Spatial Mapping.
 <img src="/External/ReadMeImages/MRTK_SurfaceMagnetism1.png" width="550">
-<img src="/External/ReadMeImages/MRTK_SurfaceMagnetism2.png" width="550">
-
-2. In SpatialMapping prefab, change Physics Layer to the new layer number. In this example, the new layer is 8
+<img src="/External/ReadMeImages/MRTK_SurfaceMagnetism2.png" width="300">
 <img src="/External/ReadMeImages/MRTK_SurfaceMagnetism3.png" width="550">
+<img src="/External/ReadMeImages/MRTK_SurfaceMagnetism4.png" width="300">
+
+2. In SpatialMapping prefab, make sure to set the Physics Layer to 31.
+<img src="/External/ReadMeImages/MRTK_SurfaceMagnetism5.png" width="550">
 
 3. Assign SolverSurfaceMagnetism script to an object. In Magnetic Surface option, select the new layer (SpatialProcessingPlane) that you created. 
-<img src="/External/ReadMeImages/MRTK_SurfaceMagnetism4.png" width="550">
+<img src="/External/ReadMeImages/MRTK_SurfaceMagnetism6.png" width="550">
 
 4. After initial room scanning, you will be able to see MRTK logo plane is smoothly snapping to the surfaces.