We can now get FaceTangent as an InputChannel, but how do we get it for other meshes / faces? Should it be there for FaceQuery?
EDIT: Oh, right, there’s a Genome for that. 
A more advanced InputChannelDerivative operator is in the works, but was not ready for v1.0. Expect it a bit later in a point release.
(Even the FaceTangent was a last minute bonus 
)
Yes, the InputChannel FaceTangent would have solved the problem I wanted the dU/dV for, orienting PRT clones to a mesh surface. Thanks.
I’m not sure if your edit means you figured it out or found a work-around, but you should be able to use any channel that is available to InputChannel in a FaceQuery operator as well. Even if the list doesn’t show it for whatever reason.
The edit was because I did the workaround of using Genome on the other object to copy the FaceTangent to a mapping channel.
When you say “should” do you mean “are” or “would be reasonable to request to”?
I meant “it works”. You just need to type it in manually. We are going to fix the list of channels to report the same list as is available in the InputChannel nodes though.
And we just did. It will be in the release build today.
Oh, I didn’t realize you could just type it in. Good to know.