What is best practice half an arc or full one for rotate rivet head

Rhino Rhino for Windows
1

Hi,
V5
surface rotate using a profile, should one halve it then rotate, or use the full left to right shape ?
In my head if I am using U for full rotate, its going to overlap itself, whilst a half one will simply swing round 360deg and meet up with itself.
so should one slive the profile in half first ? dispense with one half, then use surface rotate ?
(the blue one)
profile use half or full for rivet.3dm (64.9 KB)

Cheers

Steve

2

Hi @Steve1

If your profile curve for the Revolve is symmetrical, the resulting surface will be the same, no matter ifyou use the full curve or only half - Rhino will automatically detect that it’s a symmetrical curve and create only a single surface; so no overlap. Try it and turn on the control points to validate that it creates just the single surface (no double control points).

HTH, Jakob

3

Cheers, look same, I wouldnt have known what a double skin looked like with control points, and as it behaved itself I still dont !
however its an ok thing to do then .

Cheers

Steve

4

But in the case that it isn’t, a half profile will always be the best. IMO, get in the habit of using half-profiles and stick to it.

5

Hey -

While I don’t disagree with the conclusion, it’s been since, what?, Rhino 2 that revolving a non-symmetrical curve would result in self-intersecting geometry. I’ve always found that to be a bit too much hand-holding myself…

image
image538×308 12.8 KB

→ result of revolving a non-symmetrical curve…

-wim