This .blend contain a node group that allow to convert your normal map into a cavity map. I have improved the original node setup made by DerekWatts (member of BlenderArtists) to allow you to easily tweak the pixel radius to get thicker edges and to invert the Y channel. If you have baked a normal map in -Y for Unreal 4 set the value +Y axis on 0.
To use it you need a good normal map and edge padding to avoid getting artefacts and visible seams.
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