Two of the export options in OpenCollada are (a) “exportTexTangents” and (b) “exportTangents”.

Can someone please explain the difference between “texTangent” and “tangent”?

I am quite familar with the concept of tangent space as used in normal mapping. My guess is that for normal mapping, what we need is “tangent”, which would be the tangent to the geometry. Is that correct? In that case, what exactly is “textTangent” and when does that get used?

Thanks!