basically [curve3d] works well, with a minor issue that can be worked
around. though i don't understand why it's there. Certainlly because I made a mistake with S T coordinate when I code this object, and you are the 1st one to notice it. I don't know if it's a bug that should be corrected, or a bug that is there for so long that it should stay for compatibility. anyway, the workaround is easy.
Indeed, and yes i too think compatibility is important. A suggestion for a possible Future release: maybe you could add something like a "flip_texture" or "tex_coordinate" function to [curve3d]. (would be a great Feature anyway ;-))
Best
Oliver