Who can tell me how to use the ig_lighter?

How to use the ig_lighter of the tool in NeL, and what's the ig_lighter?????

You don't. You use the build pipeline.
The ig lighter generates lightmaps for your ig depending on your continent settings.

OK, thanks for your answer.

Another, So what's the lightmaps? Is it the texture of the shape? can the lightmaps light the landscape??

If you know, please answer me soon,  thanks first...

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