| Name | Value | Description |
| Adjacent_GroupType | 5 | Group containing Adjacent surfaces. |
| Drive_GroupType | 2 | Group containing Drive surfaces. |
| Fixture_GroupType | 0 | Group containing surfaces belonging to the fixture. Some of these may have been defined in the setup. |
| Floor_GroupType | 3 | Group containing Floor surfaces. |
| Model_GroupType | 1 | Group containing surfaces belonging to the model. These have been defined in the setup or using the model override selector. |
| Wall_GroupType | 4 | Group containing Wall surfaces. |