Nebula excluding clouds
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Well, after reading over 10 times, i still don’t quite understand what you actually means.
If you mean, you want to add a ring to a planet that localed in a nebula, you may use a fake ring to do it.
Make a large dish model without sur, texture two side with ring texture, then you are done.
Good point of this is, you will get avoid the buggy render for ring.
And, i think, a planet in a nebula, may cannot have a traditionally ring in reality.
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Just make it clear: You want to make a smaller nebula placed in a bigger nebula where’s the “old exclusion” zone cut the bigger nebula to make room for the smaller nebula?
If it is, then an exclusion zone is valid for an object you assigned to. Another words, if you define the exclusion zone for the default nebule only that wouldn’t have any effect on the new one.