VTK Examples - Updated Physically Based Rendering (PBR) examples

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It would be nice to use a standard json PBR material description format (or something as close as possible to a standard), for example glTF:

{
    "pbrMetallicRoughness": {
    "baseColorFactor": [
        0.4117647058823529,
        0.6823529411764706,
        0.4117647058823529,
        1.0
    ],
    "metallicFactor": 0.0,
    "roughnessFactor": 1.0
    }
}

That format could be then used in other places in VTK and in other VTK-based applications.

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