| Name | Description |
|---|---|
| GridFaceInfo | the information for the curtain grid (which face does it lay on) |
| MassChecker | check whether the selected element is a mass and whether the mass is kind of parallelepiped (only mass of parallelepiped supported in this sample) |
| SystemData | the class to maintain the data and operations of the curtain system |
| SystemInfo | the information of a curtain system |
| UncoverFaceInfo | the information for the faces of the mass |