Lets make Lightmass EPIC (and understandable)

Hi Guys,

I’m studying UE4 right now following all what I read in the forum and the documentation, I’m kinda stuck with the “lightmass or shadow” problem of mine.

Here’s a screen shot of a test scene

Shadow or lightmass detail is not good in the curtain…
41ee40cfe5b0b93cf570004b54308b078d40e976.jpeg

light map res for the curtain and all the walls are at 1024, I tried earlier with the curtain at 256 with a build time at 5mins, and the attached one with the 1024 which ended at 30mins T_T
baselightmass.ini are at default and the lightmass settings are .25 / 8 / 4 / 1.1

How can I fix the shadow issue? And also at the back wall I’m having a bit of grey scale banding, is that normal with the lightmass current settings and a dim lighting?
fb232d9b2628e2072b5bc00d662f435aa6a0f27b.jpeg

Thanks! You guys rock! \m/