1，增加最佳视角

a3dres/basicScene/beijing/index.json

 {
   "sceneName": "station-beijing",
+  "cameraEffects":{
+		"target": [-204.8041, 158.9969, 40.8495],
+		"position": [70.3577, 1069.073, -1181.1666]
+	},
   "models": [
     { "objName": "ground.obj", "mtlName": "ground.mtl", "modelLevel": "Park" }
   ],

a3dres/basicScene/beijing2/index.json

 {
   "sceneName": "station-beijing2",
+  "cameraEffects":{
+		"target": [-75.0174, 80.7863, 40.8477],
+		"position": [125.3736, 554.9853, -909.9784]
+	},
   "models": [
     { "objName": "gate-tower.obj", "mtlName": "gate-tower.mtl", "modelLevel": "Stuff" },
 

a3dres/basicScene/ccpc-xian/index.json

 {
 	"sceneName": "xian-ccpc",
+	"cameraEffects":{
+		"target": [208.2852, 223.6733, 81.6898],
+		"position": [287.6722, 450.966, -813.5338]
+	},
 	"models": [
 
 	  { "objName": "floor_03_dianji.obj", "mtlName": "floor_03_dianji.mtl", "modelLevel": "Building", "foreignKey": "valve-floor_03", "userData": { "key": "floor_3", "type": "floor", "name": "三楼" } },

a3dres/basicScene/cola/index.json

 {
   "sceneName": "cola",
+  "cameraEffects":{
+		"target": [209.1835, 212.0038, 33.2422],
+		"position": [369.1428, 1388.1455, 1644.1401]
+	},
   "models": [
     { "objName": "building.obj", "mtlName": "building.mtl" },
     { "objName": "floor_1.obj", "mtlName": "floor_1.mtl" },

a3dres/basicScene/station/index.json

 {
   "sceneName": "station",
+  "cameraEffects":{
+		"target": [0, 0, 0],
+		"position": [-44.4326, 249.1812, 508.5069]
+	},
   "models": [
     { "objName": "dimian.obj", "mtlName": "dimian.mtl" }
   ],

a3dres/basicScene/yinan/index.json

 {
   "sceneName": "yinan",
+  "cameraEffects":{
+		"target": [-74.5439, 53.1295, 10.5982],
+		"position":[-73.9635, 378.1644, -439.3252]
+	},
   "models": [
     { "objName": "ground.obj", "mtlName": "ground.mtl" }
   ],