FIELD · vs · PROPAGATION
a rig for seeing what 2D hides
propagation (k)
field oscillation
phase point
drag to orbit · scroll / pinch to zoom
freq
speed
auto-orbit
λφ⁴ : off
ρ_φ overlay
Oscillate
linear pol.
Spin
circular pol.
Compress
longitudinal
Peak only
scalar field
Wavefronts
3D point src.
Intersect
2 waves + λφ⁴