In another post, Pao.Olea had to deal with tubes following backbones over-twisting which needed a “Rotation Minimizing Frame (RMF)” method, which is now part of the Line Metrics POP.
That was part of a recent broader new treatment of rotations in POP attributes, and better support of quaternions and matrices as attributes. In case you missed it, the lead wiki page is
and Guillaume Lussier has made a bunch of examples in OP Snippets under POP CONCEPTS:
where you will see in addition a bunch of POPs know-how
including examples playing with attributes representing rotations:
Pao.Olea’s original post:
As always, your feedback is welcome. One missing link is quaternions driving instances, which will come in a later build.