x(u,v) = cos(u) cos(v)
y(u,v) = sin(u) cos(v)
z(u,v) = sin(v)
where:
- u ranges from 0 to 2ð, scanning a full circle on the XY-plane
- v ranges from -ð/2 to ð/2, scanning a half-circle on the XZ- (or YZ-) plane.
Ancestor: None: this is one of the original surfaces we hand-coded to get the geomorph "evolution" started.
Descendants: Drop, Facing Snails.