Lookup table null object.
The use of <NullLookupTableCtr> and <ReferenceLookupTableCtr> is mutually exclusive.
<NullLookupTableCtr>
<ReferenceLookupTableCtr>
<AngleSampler IsAbs="true" Input="CosLightSpot" Scale="One"> <NullLookupTableCtr /> </AngleSampler>
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