Annular Volume
The annular volume consists of tilted annular elliptical faces front and rear, separated by an axial distance. The front and rear face minimum and maximum coordinates are measured on the XY plane. These coordinates form an ellipse on the front and rear reference planes. The inner and outer elliptical cones formed by connecting the front and rear elliptical shapes are the inner and outer surfaces of the annular volume. The front and rear tilted faces are then tilted by the specified angles in x and y. The boundary shape of each face is defined by the intersection of the tilted plane and the annular elliptical cone. The defining parameters are:
| Parameter # | Description | Face Name | Face # |
| 1-2 | Unused | NA | NA |
| 3 | The front face minimum x coordinate. | Front | 1 |
| 4 | The front face minimum y coordinate. | Front | 1 |
| 5 | The rear face minimum x coordinate. | Back | 2 |
| 6 | The rear face minimum y coordinate. | Back | 2 |
| 7 | The front face maximum x coordinate. | Front | 1 |
| 8 | The front face maximum y coordinate. | Front | 1 |
| 9 | The rear face maximum x coordinate. | Back | 2 |
| 10 | The rear face maximum y coordinate. | Back | 2 |
| 11 | The length along the local Z axis. | Outside | 0 |
| 12 | The front face x tilt angle in degrees. | Front | 1 |
| 13 | The front face y tilt angle in degrees. | Front | 1 |
| 14 | The rear face x tilt angle in degrees. | Back | 2 |
| 15 | The rear face y tilt angle in degrees. | Back | 2 |
Face Numbers: Outside face connecting the "maximum" apertures Face 0, front face Face 1, back face Face 2, inside face connecting the "minimum" apertures on the front and back Face 3.
Next: