Blender/xNormal Black lines on edges of Normal Map

Dread Pirate Roberts

Hi everyone, I just want to say thanks in advance for your time. I've been attempting to model a high poly to low poly gun lately, and about halfway through the project I decided to practice normal map baking, just to make sure I understood it. When I tried, I ended with black lines around the 90 degree angles of the of my model, which are shown in the picture. All 90 degree angles in this model are seams and marked as sharp, and I'm using a cage for baking. Thanks again for the help.

Another picture showing a closer view of the problem.

frmdbl

It is not unusual to have a slight crease like that with sharp edges.
Try previewing the model in a game engine, to see if the problem is noticeable.

echofourpapa

It's good practice to bake with large edge padding(especially for hard edges).  Also, you might want the background to be flat normal(128,128,255) and not black.

Last note, why not bake out in Blender?

Dread Pirate Roberts

Thanks a lot for the help. I tried baking a normal with cycles, and ended up with something that looks a lot, lot nicer.

p1nga

You should check out the last post on this page,  i linked a Crye Engine doc, that explains how to get better bakes in xNormal.
http://polycount.com/discussion/149028/padding-issue
http://docs.cryengine.com/display/SDKDOC2/Common+XNormal+Baking+Errors+and+How+to+Solve+Them