I am new to Unity, and this problem might probably be an easy one to answer for you guys. I have created a room in cinema4D. I imported it in Unity and aded lightning, reflection probes and lightning probes. When I bake everything I get this really wierd pattern on my lightmap! Also, the cealing is not showing?!
Please tell me what to supply for you to understand 
my question better!
Any idea?
/Andy
If you can post your model, that would be great, that looks like really nasty Z-fighting.
And Z-fighting generally only happens on meshes with polygons too close to each other.
If you have walls with two polygons each facing away from each other, thicken them a tiny bit, and try again.
Check “Generate Lightmap UVs” Unity - Manual: Model tab
Thanks! it did fix it, I just had to delete the old lightmaps, then enabled “generate Lightmaps” for the model!!
Andy
I didn’t even think to ask this, as generally, you should have a UV2 set on your model…
But yea, it is handy to simply check that box if you’re not bothered unwrapping twice.
