Metaballs v1 — Field
The raw influence field behind every metaball: a coarse buffer colours each pixel by the summed pull of the drifting balls, before any threshold is applied.
The raw metaball influence field f(x,y) = Σ rᵢ²/dᵢ² rendered straight to a low-resolution buffer (one sample per buffer-pixel) and scaled up smoothly. This is the "what is a metaball" view that everything else thresholds.
