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This first implementation only supports it for Meshes with UV maps, and only tangents in V direction. Tangent diffuse: http://www.blender.org/bf/0001_0080.avi Tangent spec, diffuse, and bump: http://www.blender.org/bf/20001_0080.avi NOTE: since UV coordinates are still very badly subsurfed, this won't work well for subsurf meshes... on the todo. On the todo; - generate tangents for meshes without UV (with some options) - use tangents from Curve/Surface - add the Ashkimin shader from tracker ----- Important bugfix; curves didn't render anymore since yesterday. :)