Sweep1 profile perpendicular to surface

Rhino Rhino for Windows
1

Hi all,

I want to use sweep1, where the profile curve always remains perpendicular to the surface. This to make a nice rectangular groove. To illustrate what I want to do see the figure below:
image

The red profile should go over the red rail and remain perpendicular to the blue curved surface. Is there any way of doing this?

Thanks

2

Hi @jeroenvancraen12
Without seeing actual geometry (always attach a file when possible - it makes helping so much easier than a screen grab, which gives no sense of depth, complexity, orientation etc.) my guess would be that you are looking for ExtrudeCrvAlongCrv
HTH, Jakob

3

Hello - only ‘indirectly’ - if you make a temporary surface from the path curve with the Fin command (Surface menu > Extrude curve > Normal to surface) or temporarily split that curved face with the path curve, the path curve can be a surface edge; in that case, use the ‘Align with surface’ setting in Sweep1. I do not know how this will behave with the shape curve not touching the rail, but, worth a try.

-Pascal

1 Like
4

I was going to suggest something like Pascal’s approach - maybe:

  • Offset the ‘blue curved surface’ some arbitrary distance (doesn’t matter that much)
  • Pull the red curve to that surface (keep original)
  • Sweep2 (rail) the profile using the original red curve plus the pulled curve as rails
  • Delete the offset surface and the pulled curve
5

ExtrudeCrvAlongCrv does not take the normals of the plane on which the curve is lying into account does it?

6

ExtrudeAlongCrv (as with other Extrude commands) keeps the profile curve in exactly the same orientation as it follows along the curve - so the active CPlane is basically irrelevant.