Electromagnetic Field Visualization

This demo visualizes the electric dipole radiation pattern using Three.js arrow helpers. Each arrow shows the field direction and magnitude at that point in space.

Controls

• Left-click + drag — rotate
• Scroll / pinch — zoom
• Use the toggle button to switch between E-field and H-field views

E-fieldH-field

Physics Background

An oscillating electric dipole radiates fields that follow:

E-field (electric) — oscillates in the plane of the dipole axis, strongest broadside, zero along the axis.

H-field (magnetic) — circles around the dipole axis, perpendicular to E, also zero along the axis.

The field magnitudes follow a 1/r envelope in the far field (radiation zone), which is approximated here by sampling a slice at fixed radius.

This visualization is a simplified static snapshot — it shows the field pattern rather than the time-varying wave propagation.