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TOPIC: Cylinder twisted

Cylinder twisted 2 weeks 2 days ago #5749

  • Ruedi
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I'd like to draw an eight sided strut.
I assumed I could use a cylinder as a base for this, and by making creased edges on it.
But when I draw the cylinder (eight points) I see that the the control points are not precisely on the planes X and Y (should be e.g. 0 and 1) as expected by me. I used numbers without any decimals for X, Y and Z.

No big deal, as the shifting is very small, and I can adjust the points manually.
But anyway I wonder why delftship creates it this way.

Any ideas?
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Cylinder twisted 2 weeks 1 day ago #5750

  • Icare
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I noted thison my old version, too. It looks like Delftship rounds its sine and cosine calculations... after a slight rotation, meanwhile we feed it with integer numbers.
One of the problem's origins may be that the control points are not on the cylinder surface (radius or diameter) but at the intersection of two tengents to the cylinder's surface. This requires a calculation... which must be rounded.

I side with you Ruedi, it's boring ;) ... but I'm unsure there's a solution... except editing the points' coordinates after calculating them yourself... and when the cylinder must be drawn at an angle... :S
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