Two sin-cos modes mixed in t

Equation: z = sin(x) * cos(y) * cos(t) + cos(x) * sin(y) * sin(t)

Two orthogonal eigenfunctions are mixed by a rotation matrix in t. RMS amplitude is nearly conserved.

Watch the peak lattice drift and twist instead of merely bobbing in place.

Related surfaces

• Twin peaksz = sin(x) * cos(y)
• Rotating wavez = sin(x * cos(t) + y * sin(t))
• Rolling wavesz = sin(x + t) + cos(y + t)