You can either use Rhino displacement mapping, which displaces the actual geometry or use the new DisplacementThe process of utilizing a 2D texture map to generate 3D surface relief. As opposed to bump and normal mapping, Displacement mapping does not only provide the illusion of depth but it effectively displaces the actual geometric position of points over the textured surface. nodes available in the Octane plugin. The displacement nodes can be accessed under the Displacement parameter of an Octane material or from the Displacement category in the NodeGraph Editor window (figure 1).
Figure 1: Accessing the displacement nodes in the Parameter window and the NodeGraph Editor.