Twilight
Equation
\[ (z^3-2)^2+(x^2+y^2-3)^3 \]
Properties:
- degree 6
- circular cusp singularity
- smooth otherwise
- bounded
Some story
Twilight, that time when dark and light are indistinguishable.
This surface is difficult to print, as it has a horizontal cusp singularity, which is hard to resolve as an overhang. Cool it!
input