人物抖动的问题解决，界面调整，3d视觉调整

Assets/Mapbox/Unity/SourceLayers/MapboxDefaultImagery.cs

@@ -66,7 +66,13 @@
 					};
 					break;
 				case ImagerySourceType.None:
-					throw new Exception("Invalid type : None");
+					//throw new Exception("Invalid type : None");
+					defaultStyle = new Style
+					{
+						Id = "mapbox://styles/juzetest/ckmkdjwsa1nvt17nr1ps4fqgs",
+						Name = "juzetest"
+					};
+					break;
 				default:
 					break;
 			}