Octane for Houdini

The Material Mixer mixes any two material types. It accepts any two material nodes and the mix may be controlled by a value, color, or texture. There are additional inputs for connecting a displacement map and custom AOVs which will be added on top of the materials being mixed. 

In Figure 1, the Material Mixer mixes two Diffuse materials together using a Checks texture as the Mix Amount.

Figure 1: Mixing two Diffuse materials using a Checks texture as the Mix Amount