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synopsis

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MultiExcerptNamesynopsis

It is possible to tag designate objects to be part of one or many trace sets. The trace_set shader tags marks specific rays with an inclusive or exclusive trace set. Both geometry and rays can be tagged with designated as trace sets:

  • A piece of geometry can have none or any number of trace set tagssets.
  • A ray can optionally have one trace set tag, and it can be exclusive or inclusive.

 

The way those two tags interact makes it possible to control visibility for specific rays:

  • A ray with no trace set will hit all geometry.
  • A ray tagged marked with an inclusive trace set will only hit geometry which has that trace set tag.
  • A ray tagged marked with an exclusive trace set will only see geometry that does NOT have that trace set tag.
 


passthrough

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MultiExcerptNamePassthrough

The shader that gets called after setting the label.

 

trace_set

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MultiExcerptNametrace_set

The string label defining the set of objects to be traced or avoided. Objects are labeled using the Arnold Parameters Tag property.

 

inclusive

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MultiExcerptNameinclusive

If on, the tracing works in inclusive mode, else in exclusive, as described above. 

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