Octane contains native support for particles through the Octane Object Tag. This tag can be added to any emitter object in a scene. When this is done, Octane automatically detects that the object is an emitter and the Particle Rendering tab becomes active (figure 1).
Figure 1: The Particle Rendering tab in an Octane Object Tag.
Once Enabled in the Particle Rendering tab, there will be three available options: None, Sphere and Voxel.