My walls have randomly black edges - 4.10 on mobile

Development Rendering
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1

I’m trying to make an archviz scene for mobile and when I import the wall of a house I’ve modeled on 3ds max I got random issues on some edges:

http://i.imgur.com/SSO5odj.jpg

http://i.imgur.com/fgjYYpv.jpg

http://i.imgur.com/ksKtbYb.jpg

my lightmaps are very simple so I cannot think they are my problem

http://i.imgur.com/yk5DqcY.jpg

I’ve already tried many import settings and different values for the lightmaps (however I’m working with 256 for small small walls to 1024 for long walls, but even if I change them they don’t go away)

2

after many many trials I’ve figured they are called “shadow bleedings” and this video helped me a bit

however I disovered both “too little padding” and “a really great padding” in creating lightmaps work bad, creating this issue! now I’m working with a 0.04 padding (lightmaps made in 3ds max) and it seems working quite good