Using Curvy to achieve welding effect

[_Aka_]

Hi

Yes, you can do that using Curvy Generator. You can use the Scale tab of the Shape Extrusion module to make the shape's radius vary along the extrusion.
https://curvyeditor.com/documentation/generator/modules/shapeextrusion#scale

You can also use the Variable Mix Shape module to smoothly interpolate between two different shapes.
https://curvyeditor.com/documentation/generator/modules/variablemix

To create spline at runtime, you can get inspiration from the example scene 04_PaintSpline

Thanks a lot for the praise. If and when you feel like it, please leave a review for the asset, that helps a lot.

Have a nice day