Rectangular Volume Grating
This object is the same shape as the Rectangular Volume and uses the same first 9 parameters. However, the grating version adds a linear diffraction grating on four faces of the object: the top, bottom, left, and right faces. There is no grating on the front or back faces. There are two additional parameters 10 and 11:
| Parameter # | Description | Face Name | Face # |
| 1 | The X half width of the front face. | Front | 1 |
| 2 | The Y half width of the front face. | Front | 1 |
| 3 | The Z length of the volume along the local Z axis. | Side | 0 |
| 4 | The X half width of the rear face. | Back | 2 |
| 5 | The Y half width of the rear face. | Back | 2 |
| 6 | The front face tilt angle in degrees along X. | Front | 1 |
| 7 | The front face tilt angle in degrees along Y. | Front | 1 |
| 8 | The rear face tilt angle in degrees along X. | Back | 2 |
| 9 | The rear face tilt angle in degrees along Y. | Back | 2 |
| 10 | The grating line frequency in lines/micrometer on the side faces. | Side | 0 |
| 11 | The diffraction order. Multiple orders may be specified, see "Diffraction tab" . | Side | 0 |
The grating consists of equally spaced lines perpendicular to the local z axis, lying on each of the four faces. The grating frequency is the lines per micrometer along the z direction; projected down on to either the XZ or YZ plane. Note the grating exists on all four sides of the volume. The reference point is the center of the front face.
For important information on diffractive objects, see " Diffraction from NSC objects ". Face Numbers: Front face Face 1, back face Face 2, all other faces Face 0.
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