new Glodon.Bimface.Viewer.IBLSceneOption()
常量：使用环境贴图的6种选项，用于Viewer3D
Members
| Name | Type | Description |
|---|---|---|
| Gray | String | Gray |
| HarborSunRise | String | HarborSunRise |
| ParkingLot | String | ParkingLot |
| RiverSide | String | RiverSide |
| Sunrise | String | Sunrise |
| SunsetGrass | String | SunsetGrass |