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objectHandle: the handle of an object, or -1 if you wish to retrieve the extension string of the environment.
index: keep to -1, unless the object is a shape, and you wish to retrieve the extension string of a shape component (since a shape can be a compound of several other shapes).
key: an optional key indicating what value to retrieve. If none is specified, then the whole extension string will be returned. Keys should have the form of key@parentKey@...@parentKey. To retrieve the shadow enabled value of extension string "povray{ shadow {true} fadeXDist {0.00}}", specify following key: shadow@povray. The key is case sensitive.
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