How does Rhino decide on initial loft alignment?

This has been keeping me up at night. Sometimes when I select loft frames that have their seam in the same corresponding direction and location, Rhino has the loft correctly aligned to start. Other times, I have to select natural. Why does Rhino not take the natural approach to begin with?

Can you please post a small example file that illustrates the problem you’re asking about?

I agree - I’ve always thought Natural should be the default. I am pretty sure there is a YT for this someplace but I will make another if needed.

-Pascal

Problem Loft 4.3dm (3.5 MB)

If one does CRVSEAM on at a time, they are all aligned. If you select them all and do CRVSEAM they show up as in this loft (before natural).

@pascal
Did you find the YT item you were thinking of?

Bug track item added -

RH-58650 Loft: closed curve seam alignment

-Pascal