I have a simple cylindar that I would like to make. Imagine a cylindrical cannister but with a lip/rim on each "cap" of it. Is this sort of thing possible in NURBS. Im a bit new to using NURBS and am trying to stick with NURBS for the sake of learning how to work with them (they still baffle me at times).
Things I have tried:
*Revolving a thin rounded rectangle around the Y axis (kind of a rough method)
*Using a capped NURBS cylindar and adding isoparms to the cap and control the vertices to make the "lip". Would be hard to maintain symetry between the 2 lips using this method.
Any ideas?
Things I have tried:
*Revolving a thin rounded rectangle around the Y axis (kind of a rough method)
*Using a capped NURBS cylindar and adding isoparms to the cap and control the vertices to make the "lip". Would be hard to maintain symetry between the 2 lips using this method.
Any ideas?
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Re: Cylindar with a Lip - Is this possible in NURBS?
Thu, February 21, 2008 - 10:30 AMOf course it's possible. Just when you go to manipulate the isoparms at either end, make sure that you grab all of one ring on the top, and all of one ring on the bottom, and then scale them both at the same time. :) -
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Re: Cylindar with a Lip - Is this possible in NURBS?
Thu, February 21, 2008 - 1:33 PMYeah. I felt I was going in the right direction with that. The problem is getting it to be a lip on the caps and not a lip that turns into a "dipped conclave cap" -
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Re: Cylindar with a Lip - Is this possible in NURBS?
Thu, February 21, 2008 - 3:17 PMEh, just try adding a few extra, say three, isoparms to the lid, to help it maintain it's shape. The more lines of detail it has in a given area, the closer it will follow them. -
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Re: Cylindar with a Lip - Is this possible in NURBS?
Thu, February 21, 2008 - 8:09 PMI can see how I could grab each set of vertices for a set of top/bottom corresponding isoparms to maintain symmetry. However adding the isoparms in exact symmetry between the top and bottom caps is what I am confused about. Sorry I wasnt clear in my original post.
Kat -
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Re: Cylindar with a Lip - Is this possible in NURBS?
Mon, February 25, 2008 - 8:42 AMBump.
Anyone? -
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Re: Cylindar with a Lip - Is this possible in NURBS?
Mon, February 25, 2008 - 7:12 PMDraw the outline of the cylinder with a spline and revolve it.
If you want exact symmetry, then snap to grid when you draw the spline. -
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Re: Cylindar with a Lip - Is this possible in NURBS?
Mon, February 25, 2008 - 7:27 PMI tried revolving but it wasnt working. Do you have a way to describe the way it would look? -
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Re: Cylindar with a Lip - Is this possible in NURBS?
Mon, February 25, 2008 - 7:53 PMOkay, I got it. I had tried this early with a straight horizontal line to retain a cap to it but it didnt work. This method (without a horizontal line) worked real well. So how do I add the cap on the top and bottom? -
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Re: Cylindar with a Lip - Is this possible in NURBS?
Tue, February 26, 2008 - 3:34 PMSelect the isoparm at the top of the cylinder.
Duplicate Surface Curves.
Select the duplicated curve.
Make Planar. -
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Re: Cylindar with a Lip - Is this possible in NURBS?
Tue, February 26, 2008 - 3:44 PMWhat is the "duplicated curve" that Im supposed to select?
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Re: Cylindar with a Lip - Is this possible in NURBS?
Tue, February 26, 2008 - 7:50 PMEdit: Nevermind. I did figure it out. It wasnt the easiest for someone that is only *just* learning NURBS (as opposed to polygons). I created the profile of the image (since the object is perfectly symetrical and simplistic) and Surfaces>Revolve. The process was just about the same as how I have previously done with polygons, except that I had to do some curve attachments -- 2 duplicated horizontal lines, 2 identical lips (one duplicated from the others with a 180 degree rotation), and the one vertical line.
Had to keep track of them being aligned when I attached them part by part. Thanks so much Geo and Jesse.
Kat
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