Makes the selected curves (or selected CVs) curly so they resemble a helix. The curve’s first CV will maintain its original position.
Tip:
Do not apply Curl to a curve twice. The second Curl will produce poor results because it is trying to curl a curve that is already curly.
Related topics
Edit Curves > Modify Curves > Curl > 
- Curl Amount
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Determines how much each segment of the selected curves will be curled. The higher the Curl Amount, the greater the effect. The effect will be greater on a curve with many CVs than on a curve with few CVs because the Curl Amount affects each segment.
- Curl Frequency
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Determines how many curls the selected curves will be curled into.