I've confirmed that when I export from Blender in the FBX format, tangents and bitangents are not included in the file. This seems contrary to what I think other people are seeing (based on my Google searches).

Can anyone tell me if this is occurring as a result of something I'm doing wrong (I admit to knowing next to nothing about Blender), or if this is by design / a known bug / something else? I need to find a way to get this information into my FBX files.

Thanks!