"And" <49341109@ntnu.edu.tw> wrote:

>
> Is this the blender's internal feature? If so, maybe I will take a look at it.

Yes! Is this the blender's internal feature!
Advanced:
http://wiki.blender.org/index.php/Extensions:2.6/Py/Scripts/Curve/Curve_Tools

> Before that, you can try:
>
> r1 = 2/3*r0 + 1/3*r3
> r2 = 1/3*r0 + 2/3*r3
>
> Where
> r0: The first radius
> r1: The second radius
> r2: The third radius
> r3: The fourth radius

Yes, it works, thanks!
One wish:
If L < (2 * R):
sphere transform.

It is possible for you?

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