The Vertex 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. Mixer allows you to mix multiple Vertex Displacement nodes.
Figure 1: Vertex Displacement Mixer parameters
Add Input - Add a new Displacement input to the end of the node.
Remove Input - Removes the last Displacement input.
Displacement - Connects a Vertex Displacement node.
Blend Weight - Controls the mix amount of the connected Vertex Displacement node.