Geomorphs: Paper Bag

Definition of surface, in parametric equations:

x(u,v) = v cos(u)
y(u,v) = (v + b u) sin(u)
z(u,v) = a v²

where:

u ranges from 0 to 2π, scanning a full circle on the XY-plane
v ranges from 0 to 2, scanning the bag's surface.
a is a constant having the value 2.47 in this plot.
b is a constant having the value -1.26 in this plot.

Ancestor: Bullet.

Descendants: None so far.

Note: If you do not see Greek characters on this page, it is probably because the font you are currently using with your browser does not include the Greek code-page. In this page, character π is pi.

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