"Hello,
I do many sweeps and lofts and it is not weird to me that at a knuckle of rails the result of sweep may not be smooth. Of course, your second approach (two separate sweeps, each on rails without knuckles) is correct and, I think, the only…"
David Golber's Discussions
Sweep 2 rails gives bump
1 Reply
Rhino 4 running on Windows 7Strange bump from sweep-2-rails:The file sweep2 bump.3dm has two very similar surfaces, both produced by sweeping the same rails and the same cross-section curves.The one…Continue
Started this discussion. Last reply by Jacek Godlewski Feb 18.
Sweep two rails gives bumpy surface. Loft OK.
5 Replies
Rhino 4.0 running on Windows 7.I'm doing a lot of work mathematically outside of Rhino, and then moving stuff into Rhino. Here's what I get in Rhino, in the surface.3dm file:There are two curves in…Continue
Started this discussion. Last reply by Chris Tietjen Feb 6.
Sweep two rails "Two shapes are too close together"
3 Replies
I am using sweep two rails, and getting the error message "Unable to sweep - two shapes are too close together" Details: The shape I am trying to create is like the roof of a cave. Arched overhead,…Continue
Tags: too close, error, Sweep two rails
Started this discussion. Last reply by Pascal Golay Jan 15.
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David Golber posted a discussion
Sweep 2 rails gives bump
Rhino 4 running on Windows 7Strange bump from sweep-2-rails:The file sweep2 bump.3dm has two very similar surfaces, both produced by sweeping the same rails and the same cross-section curves.The one on the left has a strange (and undesired) bump just before the corner, at the top of the long section. The one at the right does not have this bump.The rails and cross-section curves are (copied) to the left of both surfaces. The cross section curves are the curves parallel to the line x=y=0. The…See More
Chris Tietjen replied to David Golber's discussion Sweep two rails gives bumpy surface. Loft OK.
"See attached."
Pascal Golay replied to David Golber's discussion Sweep two rails gives bumpy surface. Loft OK.
"Hi David-
"MINOR PROBLEM: the edge of the surface is a bit far away from the edge curves. I can probably deal with this."
Use MatchSrf, Match by closest points set, to suck the loft surface edge over to the outline curves- they are…"
David Golber replied to David Golber's discussion Sweep two rails gives bumpy surface. Loft OK.
"The surface I designed is smooth. Its intersection with the x=0 plane is smooth. (It is a order-8 Bezier curve.)
If you look closely at the curve of the intersection of the Sweep2 surface which Rhino produces, you will see…"
Chris Tietjen replied to David Golber's discussion Sweep two rails gives bumpy surface. Loft OK.
"Here's a curvature graph of your x=0 spinal curve. As you can see the intersection of the cross curves is not creating a point set that gives a smooth curve when connected. This is what is causing the bumpyness on the sweep 2…"
James Carruthers replied to David Golber's discussion Sweep two rails gives bumpy surface. Loft OK.
"Well maybe the 'maintain height' option in Sweep2 would help, or there's just something about the logic of how it builds the surfaces between sections that's not quite what you're expecting. Loft is more straightforward, it…"
David Golber posted a discussion
Sweep two rails gives bumpy surface. Loft OK.
Rhino 4.0 running on Windows 7.I'm doing a lot of work mathematically outside of Rhino, and then moving stuff into Rhino. Here's what I get in Rhino, in the surface.3dm file:There are two curves in the "edge" layer in the xy plane which are mirror images of each other.And a large number of cross sections and two end points in the "cross curves" layer. The cross curves end on the edge curves. The whole thing is about 350 mm long, and the cross sections are spaced 2 mm apart.I am also…See More
Pascal Golay replied to David Golber's discussion Sweep two rails "Two shapes are too close together"
"No problem, I'm glad it's sorted out - thanks for the update.
-Pascal
pascal@mcneel.com"
David Golber replied to David Golber's discussion Sweep two rails "Two shapes are too close together"
"False alarm: I had to look very closely, but it turned out that some of the cross-section curves were duplicates! So it is not surprising that this produced an error message.
Thanks Pascal for beginning to look at this. And…"
Pascal Golay replied to David Golber's discussion Sweep two rails "Two shapes are too close together"
"Hi David- please post, or send me, the curves you are using.
thanks,
-Pascal
pascal@mcneel.com"
David Golber posted a discussion
Sweep two rails "Two shapes are too close together"
I am using sweep two rails, and getting the error message "Unable to sweep - two shapes are too close together" Details: The shape I am trying to create is like the roof of a cave. Arched overhead, with changing arches specified by cross section curves, tapering down to a point at each end. The rails are mirror images of each other, about 360 mm from end to end. I have cross-section curves defined about every 2 mm. (Generated by mathematics elsewhere.) I select the two rails, then for cross…See More
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