The Render Geometry Settings node is where geometry-specific Octane parameters can be found (figure 1). The parameters found in this node are similar to adding the Octane Object Parameters (+ObjParms) in the SOP environment.
Figure 1: Adding object-specific Octane parameters using the Render Geometry Settings node
The Primitives parameter is used to target specific objects in the scene, or expressions can be used to target multiple object types (figure 2).
Figure 2: Specifying a scene object in the Render Geometry Settings node