## Shells

### Joint variation of parameters

Effect of the joint variation of some parameters

1. $$\alpha$$ and $$\beta$$ angles that shape the helicoidal curve
2. $$a$$ and $$b$$ lengths that define the initial ellipse
3. $$\phi$$, $$\mu$$ and $$\Omega$$ angles that allow to rotate the ellipse in space
4. $$\alpha$$, $$\beta$$, $$a$$ and $$b$$ angles that shape the helicoidal curve and lengths that define the initial ellipse