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 File > Load Path Tracer Materials.
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.
Select the filter you would like to apply on the material.
Optional: Enable advanced properties display.
Under Ray Tracing in the Properties section, set the material.
Figure 3. Assign Material to Filter
Under Ray Traced Rendering in the Properties section, enable the
Enable Ray Tracing checkbox.