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Normal map baked asset importing with weird shadow artifacts!

Hello everyone!

So I have this weapon a friend and I have been working on. We have a high poly and a low poly, and baked out the detail into a normal map. This is what it looks like in Blender:

high quality
774af9f3db21e5c8df688b59949841997f993a3b.png

low quality
43107223c82131b8bba7999ec7f66fd585d757c1.png

normal map
bake 512.png

final render
baked_blender.png

It looks acceptable, right?

Problem is, when I import it into Unreal 4, I get a problem:

d65f5413373c5a6246726e9d9480b3372e7a6b74.jpeg

Look at it! It’s… Gross!

Now my first thought was to harden the edges and re-export, as I didn’t bother to do that as the normal map took care of it for me, but better safe than sorry, right?

in_engine_edges.jpg

Honestly, now it looks even worse!

I toyed with blender’s export settings, messing with all the smoothing group options and mixing those with and without edges, deleting all my modifiers. I tried every combination. No dice.

What is going on here? How do I fix this? :0

You have to flip your green channel -> double click onto the normal map - in the properties you have to enable “flip green channel” :slight_smile: