"LanuHum" <Lan### [at] yandexru> wrote:
> "And" <49341109@ntnu.edu.tw> wrote:
>
> >
> > Basically each control point corresponds with one radius. Like the example, the
> > position at the first control point is the first radius. The second and the
> > third radii represent the trend. And the fourth radius represents the radius at
> > the fourth control point.
>
> Look here:
> https://youtu.be/LFxqVXUoFzg
> What shall I write as the second and the third radii???
> Especially as control points can be 1000 and more?

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

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