| Name | Value | Description |
|---|---|---|
| VERTEX_POS | 0x0001 | Includes the position in the undo unit. |
| VERTEX_BLEND | 0x0002 | Includes the blending weights and matrix index in the undo unit. |
| VERTEX_FLAGS | 0x0004 | Includes the vertex flags in the undo unit. |
| VERTEX_SELGROUP | 0x0008 | |
| VERTEX_ALL | 0xFFFF |