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I drew a bezier curve and tried to applied curve modifier to a long cylinder with this bezier curve. I noticed that the generated cylinder has self-penetration on its cross sections. How to avoid this? And how to align the cylinder with the curve? The curve has an origin outside the curve. I don't think it is hard to edit the origin point of the curve. Any hints are appreciated. Thank you.

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  • $\begingroup$ the curve and the cylinder should have their origin at the exact same position, is it the case? $\endgroup$
    – moonboots
    Commented Jul 27, 2021 at 5:10

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You probably have reversed handles on control points.

Select the Bezier Curve and enable Curve Edit Mode normals in the Overlays drop down:

Overlays drop down

set the length to something large and edit the curve.

If the curve handles aren't backwards, it will look like this more or less

curve handles OK

But if they're backwards, then it will look like this

curve handles reversed

If they are reversed, then your cylinder will have kinks in the same places

kinks

To fix the curve, select the control point that has the reversed normals and rotate the handle until they point the right way.

You'll have to do this for every screwed up control handle. It looks like you have two.

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  • $\begingroup$ I have opened up the bezier curve (see above). It may contain reversed normals. I generated the bezier curve by linking points. Is it a better way to control the normals instead of rotating the handle(which should be the points, right)? $\endgroup$
    – tryphena
    Commented Jul 27, 2021 at 3:15
  • $\begingroup$ Typical to extrude new control points from one end or the other $\endgroup$
    – Marty Fouts
    Commented Jul 27, 2021 at 3:25

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