I've tried combination of many settings in both terrainlightmaps and objectlightmaps but it didnt do the job =/
the issue is that when i lightmap, ingame the vehicle (as well as any other gameplay object) shadows looking very weird.
Here is the screenshot:

Guys, please i will really appreciate it you will help me with this problem
it has been already a week i'm trying to fix this issue. =(
map is ready for 95%, and this problem is the only thing that holds me in one place....
Thank you very very much in advance!

