How do I fix these dark lightmap stains?

Hi,

I’ve ran into this problem in a few projects that I’ve done, and I’ve never really understood what caused it and how to tackle it.

I sometimes get these dark stains on my lightmap, which I don’t understand.

Here’s an image of my current project:

The example on the right still has lightmap errors but thats just because of the texel size and texel placement. Don’t worry about that.

I think it’s got something to do with my lightmapping settings, but I’m puzzled. Here’s my lightmapping settings:

36719-3.jpg

Any help? Thanks!

Have you tried baking with Higher quality settings?