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+ means one or more events. This means after the initial event, begin collecting others. This means it will collect indirect lighting only as the first (direct) event is skipped. Below is only indirect diffuse reflection (the typical indirect light AOV)
| Code Block |
|---|
lpe:C<RD>.+[<L.>O] |
None
If none of the notations are used, it collects an event and then goes to the light, collecting only direct lighting. Below we omit the * and the +, only direct diffuse reflection is collected.
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Of course you can also ask for other data from a path to a light group like indirect diffuse reflection (usually known as indirect lighting) for later scaling in compositing.
| Code Block |
|---|
lpe:C<RD>.+[<L.('key'|'fill')>O] |
Now you can output whatever you need based on light groups!
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