Normal Maps in UnrealEngine 4

andropof

Hi  
I need to bake a Normal Map, but the model is a wood material, so I can't use smoothing groups, because i don't want to split the UV. But i'm getting some bad results baking the Normal Map. Object Space Normal Map looks better than the Tangent Space Normal Map, so I have two questions:
-It is possible to use Object Space Normal Map in UnrealEngine 4? And how?
-There is a way to use smoothing groups without splitting the UV?

ZacD

Can you post some pictures of the issue? You can set custom vertex normals or add edge loops or bevels to help control shading. But if you have a hard edge, you need a UV split. 

andropof

Thanks for the reply! I have added edge loops to control shading but as you can see the Tangent Space Normal Map looks pretty bad.
http://imgur.com/P2xvQ0o
http://imgur.com/9CgxQ8z

AdvisableRobin

What Zac said.
Both images are showing the same issue, the OS is just less visible. If you have a smoothing group/hard edge you must have a UV split. If you cannot have a UV split for whatever reason then you need to keep it as one smoothing group/soft edges and give it a bevel/control loops

Read this thread for more info into why this is so.

musashidan

Or you can use a synced workflow and not worry about uv splits/smoothing groups at all.

andropof

I have eliminated the extra control loops and used smoothing group, dividing the UV. Now the normals looks good.
What is a "synced workflow" and how I can do it? I have searched on the internet but without answer...

repete

andropof said:

I have eliminated the extra control loops and used smoothing group, dividing the UV. Now the normals looks good.
What is a "synced workflow" and how I can do it? I have searched on the internet but without answer...

Let Wes explain it to you:

https://vimeo.com/74459307

ZacD

And these are good too.

https://www.youtube.com/watch?v=m-6Yu-nTbUU

https://www.youtube.com/watch?v=ciXTyOOnBZQ