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So I'm making a track for my car to ride over and I've been working with curve tilt. This weird twist shows up at the point where I merge the ends of the curve together. I already tried to remove the segment and remerge (if that's a word) it. Doesn't work. Any ideas?enter image description here

I already made it cyclic and I started tilting it but of some reason It does this even when redoing the merge. There is a full twist somewhere else on the track so that is probably a reason.

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  • $\begingroup$ Why don't you make the curve cyclic before shaping it ? In edit mode 'alt + C' $\endgroup$ – Yvain Apr 3 '16 at 17:05
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Make sure that in the Global Transforms the segments have the same tilt:

When two segments have different tilt (90 and -90) you'll get a loop when you connect:

enter image description here

Wehn the segments have the same tilt, the segment will be straight:

enter image description here

If one of your segments is flipped try this:

Deselect all (A)

Select one control point and then select linked (L)

Rotate the whole segment 180 degrees by adding +180 on the Mean Tilt section.

Link it then with the other section.

enter image description here

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Looks like a half twist to me. Somewhere else on the track you must have a half twist, which results in the normals of the joining segments going in opposite Z directions.

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  • $\begingroup$ No it's really a whole twist. There is only a cocscrew in the track. That is a full twist. At the right you see the top of the track and on the left as well. It's defenitely a full twist. $\endgroup$ – Hendriks3D Apr 3 '16 at 17:56
  • $\begingroup$ I see it now. The right side of the screen cap was confusing to me. Carry on! $\endgroup$ – snomsnomsnom Apr 3 '16 at 17:58
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Vertical Segments Confuse Blender
Avoid making a Curve cyclic while one of your end segments are perfectly vertical (Z-Axis). I guess Blender gets confused in this case.
My solution was simply to "Make Cyclic" at another spot in the curve.

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