"Hi John- the problem with the off-center curve is that the surface has some double curvature and therefore the unroll has some error- I gather the problem is that there is no provision for distributing the error…"
John Taylor's Discussions
UnRoll Surface Help
5 Replies
HiEach time I try to unroll this lofted surface the curves that are center on the lofted surface end up 3.41 mm off center on the unrolled surface.I hope someone with more surfacing experience can…Continue
Started this discussion. Last reply by Pascal Golay Jan 3.
Devolopable Surface Wrinkle
19 Replies
HiI am working on a small skiff that will be built from aluminum. The bottom surface was created with DevSrf in V4.The file was brought into V5 and Unroll Developable Surface was used but the…Continue
Started this discussion. Last reply by Lowell Walmsley Dec 21, 2012.
Devolope Surface Command
2 Replies
HiWe've been using the Develop Surface (DevSrf) command from Rhino labs for years. For the amount of twist we need Devsrf creates surfaces that are more accurate than Loft.I just tried the Devsrf…Continue
Started this discussion. Last reply by John Taylor Dec 7, 2012.
John Taylor's Page
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John Taylor replied to John Taylor's discussion UnRoll Surface Help
"Hi Pascal
Did you find a solution for the off center curve?
The radii at the end of the lines seemed to be causing the 2nd problem. I exploded everything, removed the radius corners and joined everything back together then it worked.
John"
Pascal Golay replied to John Taylor's discussion UnRoll Surface Help
"Hi John- for now, Explode (and Group, for convenience) the curve and unroll it as pieces- it seems to maintain its shape that way.
-Pascal
pascal@mcneel.com"
Pascal Golay replied to John Taylor's discussion UnRoll Surface Help
"Hi John- thanks, I see this here as well, I'll get these examples onto the bug pile.
-Pascal
pascal@mcneel.com"
John Taylor replied to John Taylor's discussion UnRoll Surface Help
"On this one a straight line on an extruded surface that when unrolled looks like it became a control point curve."
John Taylor replied to William Wang's discussion draw dignal lines on a curved surface
"Hi William
To do this I will create a diagonal plane using Rectangular Plane 3 Point through the curved surface, then use Object Intersect to create a curve on the surfaces.
Other times I will use Pull or Project Curve to Surface but I…"
John Taylor posted a discussion
UnRoll Surface Help
HiEach time I try to unroll this lofted surface the curves that are center on the lofted surface end up 3.41 mm off center on the unrolled surface.I hope someone with more surfacing experience can tell me what I've done wrong and how to find the problem.Thanks JohnSee More
Lowell Walmsley replied to John Taylor's discussion Devolopable Surface Wrinkle
"Here's a description of what Twist means in the DevSrf dialog
"
Lowell Walmsley replied to John Taylor's discussion Devolopable Surface Wrinkle
"I think I see what's going on.
The bottom is pretty flat so the rulings can go pretty much anywhere.
With the flat area, the locations are probably being influenced by numerical noise in the calculations. There may be a difference…"
John Taylor replied to John Taylor's discussion Devolopable Surface Wrinkle
"Hi Lowell
This is the original set of 3D Curves in V5 for the skiff, before the sheer line was lifted 50mm.
The back (stern) of the surfaces would be trimmed off afterwards
John"
Lowell Walmsley replied to John Taylor's discussion Devolopable Surface Wrinkle
"That doesn't sound good.
Is it possible you can give me some curves so I can see what's going on in that case?
It sounds likely that its because of some other difference that you get different answers, but the only way to know is to look…"
John Taylor replied to John Taylor's discussion Devolopable Surface Wrinkle
"Hi Lowell
Turns out the customer wants higher sides on the skiff so the side surfaces have to be redone.
In V5 I tried to extending the chine and shear curves by 24, 36 & 48" none of which would allow a full length surface to be…"
John Taylor replied to John Taylor's discussion Devolopable Surface Wrinkle
"Hi Dennis
I like the idea of using history with loft I'll give that a try.
I'll use both loft and DevSrf depending on the amount of curvature and what else needs to be done with the surface.
The issue I've have with loft is the poly…"
Dennis Harjamaa replied to John Taylor's discussion Devolopable Surface Wrinkle
"Hi Lowell,
I try to use the smallest possible number of control points in the two edge curves.
If a surface actually appears it is good. Most of the time after picking the two edge curves using Loft I get a horrible faceted mess. Very small nudges…"
Lowell Walmsley replied to John Taylor's discussion Devolopable Surface Wrinkle
"Dennis,
When you nudge control points until an acceptable surface appears, how do you evaluate when the surface is acceptable?
Lowell"
Dennis Harjamaa replied to John Taylor's discussion Devolopable Surface Wrinkle
"Hi guys,
I just got Rhino 5 installed and thought I'd join the community, finally after using Rhino for years.
I've used the loft command to make successful hull panels, I've found the devsrf a bit confusing and it's…"
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