Order of derivatives in Surface.Evaluate()

Rhino Developer
1

Hi, I cannot find the answer.

5 vectors are returned when getting the second derivatives of a NURBS surface through Surface.Evaluate().
Does anyone know which way they are ordered?

  1. u,v,uu,uv,vv
  2. u,v,uu,vv,uv

Thank you!

2

1 is correct. We’ll update the documentation.

2 Likes
3

Thanks, that’s helpful!