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Most of the commands (except "Convert into curves") are only available in Edit Mode and by the Curves floating toolbox. Curves are often called Bezier curves (Bezier was the french mathematician who invented them).
Angle
Allow to modify only one handful on a
knot in Bezier Mode.
Smooth
Transform a straight angle by smoothing
it (Bezier). Select the knot(s) then apply.
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Symmetry
Make handfuls of Bezier curves symmetric.
You have identical segments.
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Curve-->Line
Transform a curves (Bezier knots) into
a line (straight angles).
Line-->Curve
The opposite of the previous command.
Delete
knots
Choose a knot and delete it.
Add a
knot
First click where you want the knot to
be placed (a dot appears) click this command... you have added a knot.
Join knots
You can merge 2 ends by selecting knots
(click on the first one then old <shift> and click on the second) and
join them. Essential if you want to close a curve.
Cut the
curve
Select the point and cut the curve at
this point.
Associate
Bézier
You can merge 2 Beziers curves with this
command.
First go out of the Edit
Mode (spacebar), select the 2 curves and launch this command. You obtain
1 object.
Separate
Bézier
First verify that the curve comes from
a association of different segments. If it's not the case, use "Cut the
curve". You will obtain as many individual objects as segments.
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Convert
into curves
This command allows you to transform a
text into curves.
You must do this if you want to transform
it into a mask or if you want to use it with transformations.
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