Load the Rendering Material Library
Material library has less stringent requirements, as it is always loaded on a per-need basis. In that sense the material libraries can be stored at any location and it is not a requirement to keep those locations permanent.
- Open ParaView.
- 
                From the menu bar, select .
                Figure 1. Loading the Path Tracer Ray-tracing Engine Materials  
 
- 
                Navigate to the material libraries location, select
                        nFX_metal_and_oil_v1.json, and click
                            OK.
                Figure 2.  
 
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                Select the filter you would like to apply on the material.
                
- 
                Under Ray Traced Rendering in the Properties section, enable the
                        Enable Ray Tracing checkbox.
                Figure 4.  
 
