Bug in tangent space normal map baking?

I’ve encountered a weird problem in blender lately and I was wondering if am I doing something wrong or it is a bug. I use the latest version of blender (in linux).

I have a multirez mesh. When I bake an object space normalmap I get this result:

http://www.ancient-ritual.com/no_ancient_data/normobjsp.png

BUT when I try to bake the tangent normal map I get a constant blue:

http://www.ancient-ritual.com/no_ancient_data/normal.png

I could be wrong, but I think since Tangent Space normals are based on the relative change from the true normal to the shape in the normal map, you would have to be baking from a high-poly mesh to a low poly mesh to see any actual changes in the Tangent space normals. Try adding a plane cylinder as a new object, unwrap it, add an a new image to it, then bake by selecting your original mesh, shift selecting the new simpler mesh, and using the bake to active option.

bake “selected to active” is working but not from the multirez. I will try to report it as bug to see what happens

I’m getting this bug too when I try to use “Tangent” bake on a multi-res mesh. Is this a bug?

Tangent normal map is the changes of normals from on mesh to another.

So are you using two meshes? one high on low?

other thing could be that you have assigned a texture to the normal slot and using the first normal map? if so unselect that while baking.

If those are not the cases plz post a blend file.