Docs: Note that the radius arg of bd.Helix is the "minimum radius" when cone_angle>0

[KilowattSynthesis]

When cone_angle>0, the cone of the helix expands outwards (thus making the radiux arg the "minimum radius"). The docs don't currently mention this.

[gumyr]

If the cone_angle<0 the helix gets smaller as it proceeds so the radius isn't the "minimum" but maybe the "base" radius.

[KilowattSynthesis]

Hmm good note; hadn't considered that. I don't think "base" radius is necessarily clear, as it's not clear what "base" means (I guess it's the radiux closest to the orgin?).

Perhaps:

When cone_angle != 0, the radius argument is the radius at the side of the cone closest to the origin. When cone_angle > 0, the radius expands outwards farther from the origin; when cone_angle < 0, the radius spirals inwards.