The sorting mode for particle systems.
| None | No sorting. |
| Distance | Sort based on distance to the camera position. For orthographic cameras, this mode is the same as sorting by depth. |
| OldestInFront | Sort the oldest particles to the front. |
| YoungestInFront | Sort the youngest particles to the front. |
| Depth | Sort based on depth from the camera plane. |
| DistanceReverse | Sort based on reverse distance to the camera position. For orthographic cameras, this mode is the same as sorting by depth. |
| DepthReverse | Sort based on reverse depth from the camera plane. |