Why is Lightmass calculating everything again?

Development Rendering
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1

Just for understanding purposes.
Why is lightmass calculating the whole scene everytime you build lighting?
Wouldn’t it be much less time consuming, if you only rebuild that lightmaps which have changed?
Thanks and regards

2

Hi egalegal,

Lightmass has to recalculate for the entire scene in order for lighting to look correct. The option you’re looking for is “Build Selected Only” which does not exist in UE4. There is a feature request in for this, but I don’t see it happening in the near future.

3

Thanks for the answer.

4

ATTENTION!! : Please CAST A VOTE for this feature here Unreal Engine Issues and Bug Tracker (UE-10034)