Oscillating xy saddle

Equation: z = sin(t) * x * y / 5

The factor sin(t) scales the whole surface. At zeros the graph flattens; when the sign flips, valleys and ridges swap.

Use this preset to explain a time-dependent coefficient in a parametric equation.

Related surfaces

• Twisted planez = x * y
• Saddle surfacez = x^2 - y^2
• Pulsing peakz = 10 * exp(-(x^2 + y^2)/10) * (1 + 0.4 * sin(t * 2))