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Set IOR to 1.5 in OSPRay

Michael Migliore requested to merge michael.migliore/vtk:fix-ior into master

Most of dielectric materials have an IOR (except gemstones) between 1.33 and 1.58.
In PBR shader, it is set to 1.5 (F0 is 4%). For consistency, IOR is set to 1.5 in OSPRay now as well.
This MR also removes default irradiance that was added by error.

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