/3/ - 3DCG

>>630592
i only know some of the rules, which are relevant to me.

if you export unreal, you have to have a lightmap UV channel into your model, otherwise unreal will nag yo to death.
blender have an automatic capability to do a lightpack, but its pretty bad. so you have to duplicate the existing UV channel and call it "UV0"
for unity there isn't much to say other than its important to create dependencies in blender for multiobject stuff.

pic related, it transfers to unity and it makes it easier to manage rotations
for unreal rigs you might have some issues, but for that you need to place your model in 0,0,0 world position and export it this way. it solves many problems (in unreal too)