mgajewski Posted May 24, 2005 Share Posted May 24, 2005 I'd like to model a wavy ring - just picture a sinusoidal wave that you then bend into a perfect circle such that the side view is a wave and the top view is a circle - as shown in my attached (clumsy) sketch. Any tips would be greatly appreciated Quote Link to comment Share on other sites More sharing options...
Cary OConnor Posted May 24, 2005 Share Posted May 24, 2005 If you are trying to create something like in the image attached, you can create it with cylinders and the TriBall. Create your base ring size with extra thickness. Add a h-cylinder to cut the thickness. Use the Triball to Rotate Copy and then add blends to the remaining edges. Then Mirror the h-cylinders and ad blends to that side. Hope That helps. Cary Quote Link to comment Share on other sites More sharing options...
Cary OConnor Posted May 24, 2005 Share Posted May 24, 2005 If you want to get more complex. Create a Sin Wave 3D Curve using the Formula Curve. Project the curve to a Cylinder face. Then sweep a profile along the projected 3D Curve profile. Cary Quote Link to comment Share on other sites More sharing options...
Alex Khenkin Posted May 24, 2005 Share Posted May 24, 2005 the attached file can be used as a starting point - I used a 3d formila curve as a guide for a sweep. The formula is very simple - use Polar coordinates, enter a number for the radius and "sin(n*t), where n is the number of waves you want for the Z coordinate. -Alex. wavy_ring.ics Quote Link to comment Share on other sites More sharing options...
Alex Khenkin Posted May 24, 2005 Share Posted May 24, 2005 (edited) by the way, has anybody here ever modeled a Moebius strip in IC? Edited May 24, 2005 by Alex Khenkin Quote Link to comment Share on other sites More sharing options...
mgajewski Posted May 25, 2005 Author Share Posted May 25, 2005 Thanks, Alex - that is a clean and elegant solution - I'm going to experiment with it. You might want to check out http://www1.kcn.ne.jp/~iittoo/us27f_mobi.htm - they explain formulas that describe the edge and surface of a Mobius strip. I've also found this: A parametric representation of a Mobius strip, with its centre-line a circle of radius r in the xy plane, and with a width of (2 * w), is as follows: x = ((r + (t * cos(u / 2))) * cos(u)) y = ((r + (t * cos(u / 2))) * sin(u)) z = (t * sin(u / 2)) 0 ≤ t ≤ w (0 ≤ u ≤ (4 * π)) r = 5 and w = 1 draws a pretty good Mobius strip. The parameterisation also works with the intervals: -w ≤ t ≤ w (0 ≤ u ≤ (2 * π)) Mark Quote Link to comment Share on other sites More sharing options...
mgajewski Posted May 25, 2005 Author Share Posted May 25, 2005 Cary, Thanks for the tip. I'll have to try this - I want to see if the sine curve will wrap itself all the way around the cylinder (360 degrees) without getting distorted. I thought that projecting curves worked like slide projection (parallel)... or am I missing something from your suggestion? Mark Quote Link to comment Share on other sites More sharing options...
cborer Posted May 25, 2005 Share Posted May 25, 2005 (edited) Over all it would be nice to have a collection of formulas for that tool. As a mathematic NoNo I have absolutely no idea what I might type in. So it would be nice to have the collection with a preview picture. Carlo Edited May 25, 2005 by cborer Quote Link to comment Share on other sites More sharing options...
Guest IronKevin Posted June 1, 2005 Share Posted June 1, 2005 There are a number of sample formulas listed under the Settings drop-down menu in the Formula Curve dialog. IK Quote Link to comment Share on other sites More sharing options...
cborer Posted June 2, 2005 Share Posted June 2, 2005 Oh yes I see. I just see the preview now Thanks Kevin Regards Calo Quote Link to comment Share on other sites More sharing options...
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