Explore parametric equations.

Drag and drop the surface to rotate it.
Use your mouse wheel to zoom in/out. Enable the *t* parameter to run
parametric equations. Most Math methods are global.

f(x, y) | |

t | from: to: loop: |

display | grid: surface colors: R G B |

examples | Sa(2x) * Sa(2y) | sin(4x).cos(2y) | sphere |