Tangent Normal Map produces reversed effects

Questions & Answers
1

I've created Tangent Space normal maps in Blender (from hi-ploy sources) to apply to my objects. However when I bring the object into Unity and apply the map the textures appear reversed; concave areas appear convex etc. The Normals themselves are correct and render correctly in Blender.

How do I get the Normal Maps to display correctly?

Cheers

psullie

2

Blender uses the opposite Red and Green for normal maps. You have to flip the red and green channels to meet the industry standard.

http://forum.unity3d.com/threads/35110-Normal-mapping-flipped.?highlight=Normal+flipped

http://forum.unity3d.com/threads/23177-Normal-Maps-vs.-Hi-res-Meshes

http://wiki.blender.org/index.php/Doc:Manual/Render/Bake (At the bottom of the page)