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How to draw a circle on a cylinder surface

Posted Jul 7, 2017, 8:41 p.m. EDT 2 Replies

Yu Zhang
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Dear all,

I want to draw a circle on a cylinder surface, but the work plane only provide a planar surface, which cannot be coincided with curved surface. Do you have any available approaches to achieve that?

Thank you for your help.
2 Replies Last Post Jul 8, 2017, 3:19 a.m. EDT
Robert Koslover Certified Consultant
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Posted: 7 years ago Jul 7, 2017, 10:58 p.m. EDT
Create another cylinder that intersects with your cylinder, and execute an intersection (Boolean) operation between them. Delete any leftover geometry elements that you don't want.
Create another cylinder that intersects with your cylinder, and execute an intersection (Boolean) operation between them. Delete any leftover geometry elements that you don't want.
Edgar J. Kaiser Certified Consultant
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Posted: 7 years ago Jul 8, 2017, 3:19 a.m. EDT
You have to define what a circle on the cylinder surface is for you. A circle is inherently a flat (2D) curve that doesn't exist on a curved surface.

Robert's approach projects a circle on a cylinder surface but this curve does not fulfill a circle's implicit definition in 3D:


If you need something like this you may try to find a suitable parameterization. However , in turn the projection of such a curve on a 2D plane will no longer look like a circle.

Cheers
Edgar

--
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
You have to define what a circle on the cylinder surface is for you. A circle is inherently a flat (2D) curve that doesn't exist on a curved surface. Robert's approach projects a circle on a cylinder surface but this curve does not fulfill a circle's implicit definition in 3D: [math] (x - x_0)^2 + (y - y_0)^2 +(z - z_0)^2 = r^2[/math] If you need something like this you may try to find a suitable parameterization. However , in turn the projection of such a curve on a 2D plane will no longer look like a circle. Cheers Edgar -- Edgar J. Kaiser emPhys Physical Technology http://www.emphys.com

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