Creating a sweeping curved feature on top of a bottle by surface modelling.
I am trying to create a sweeping add on feature around the shape of a bottle in surface modelling.
It is similar to the idea of a helterskelter. I have already made the surface of the bottle underneath and I am wondering how I can now make this on top. I have tried to show this by the sketch attached below.
If anyone can help, or suggests a better way to do this I would be so grateful.