I find Quill3D lightmaps go weird at the edges of brushes i.e. where vertices/edges of different brushes meet.
Extreme example rendered on the highest lightmap setting

In CShop this shadow would be rendered with no artifacts,lightmapping is one of the things CShop does really well...just a shame about the random crashing =/
Extreme example rendered on the highest lightmap setting

In CShop this shadow would be rendered with no artifacts,lightmapping is one of the things CShop does really well...just a shame about the random crashing =/