The rendering mode for particle systems.
This is used by the ParticleSystemRenderer to determine how to render the particles.
|Billboard||Render particles as billboards facing the active camera. (Default)|
|Stretch||Stretch particles in the direction of motion.|
|HorizontalBillboard||Render particles as billboards always facing up along the y-Axis.|
|VerticalBillboard||Render particles as billboards always facing the player, but not pitching along the x-Axis.|
|Mesh||Render particles as meshes.|
|None||Do not render particles.|