[pstricks] Drawing a Klein Bottle

[Rich Shepard]

On Wed, 30 Jan 2013, Oliver Schmitt wrote:

> set parametric
> x(u,v)= v<2*pi ? (2.5-1.5*cos(v))*cos(u) : \
>        v<3*pi ? -2+(2+cos(u))*cos(v)    : \
>                 -2+2*cos(v)-cos(u)
> y(u,v)= v<2*pi ? (2.5-1.5*cos(v))*sin(u) : \
>                sin(u)
> z(u,v)= v<pi   ? -2.5*sin(v)             : \
>        v<2*pi ? 3*v-3*pi                : \
>        v<3*pi ? (2+cos(u))*sin(v)+3*pi  : \
>                 -3*v+12*pi
> splot x(u,v),y(u,v),-z(u,v) w pm3d

   Thank you, Oliver! I'll study this to be sure that I understand it well.

Much appreciated,

Rich