AlgoSurfer - an implicit surface viewer, by J.-O. Lachaud, fps:

Help View surface Restart

// Computes f(x,y,z). You may use x2 for x*x, x3 for x*x*x, // same holds for y and z. Constant must be floating numbers. // Durckblick + ball return ( x2 + y2 + z2 - a*a ) * ( x3 * y + x * z3 + y3 * z + 5. * z );