---
title: "Body Map Viewer — Lead Interview 1 (post round 1)"
description: "Jeroen's rulings on the round-1 open decisions"
type: workshop
status: active
workshop: body-map-viewer
created: 2026-07-25
---

# Lead Interview 1 — Jeroen's rulings (post round 1)

Held after [round-1-notes.md](round-1-notes.md). Presented: the three independent
convergences (tagged envelope triggered; viewport-sized canvases below
orbital/region; T-1177 cliff representation), the composing cache proposals, the
two named tensions, and the 10-item OPEN-FOR-SYNTHESIS list.

## Ratified by silence (presented as settled-unless-objected; no objection)

- **Tagged-envelope migration: triggered** (three seats, measured numbers). Round 2
  designs the mechanics.
- **Viewport-sized canvases at every step below orbital/region; canonical survives
  only as the global tier.** (This also resolves the brief's canonical-vs-viewport
  interview question.)
- **Cliff representation** `elevation` + `channel_depth` + `cliff_edge` (unanimous
  among adopters).
- **Cache composition**: Dudley's server-side global tier (~174 MB PNG-encoded,
  D-203-shaped resource, not SQLite) + Stig's client-side `FileAccess` cache dir —
  compose, don't compete. Both rejected SQLite in every shape independently.

## Rulings

1. **Step ladder — "Round 2 proposes, I rule at interview 2."** The synthesis round
   produces 2–3 concrete ladder tables (step counts, factors, per-step derivation
   rung + measured cost); Jeroen picks from real tables, not principles.
2. **Map time axis — current state via TTL-split**, his prior hint made concrete:
   static geometry cached indefinitely-fresh (determinism), frozen/flooded carried
   as separately-cached short-TTL planes re-requested as sim time advances.
   **Amendment (verbatim):** *"we still may also want to evict non global level
   geometry based on time to save storage for planets the player visits but never
   goes back to."* → Captured as a design rule: **staleness-eviction and
   storage-eviction are distinct axes.** Geometry never goes stale (re-derivable,
   byte-identical), but sub-global geometry entries still get evicted on
   time-since-last-visit as a storage-budget policy. The global tier alone is
   keep-always.
3. **Cliffs — sparse `CliffSegment` feature list, Phase-4 scope.** Aligns the
   rarity finding, Araminta's encoding logic, and Tyre's scope ruling. Troblum
   still stress-tests the rarity basis (one real body + synthetics) in round 2.
4. **Round 2: GO, with measurement ⑥ run now** — Stig runs the missing
   `Image.set_pixel` cost measurement (330K/2.07M/8.3M cells, client-side) in
   parallel with synthesis so the shader-vs-CPU (c1) call lands with a number.
   Troblum joins with the adversarial mandate.

## Carried to round 2 (synthesis work, no ruling needed)

Envelope mechanics (message shape, demux, legacy-carrier coexistence);
seed-chaining data flow (independent re-derivation vs consuming the coarser step's
output — Dudley's costs assume the former); region-as-step-0 confirmation;
label placement de-dup at step seams (Tyre's gray case → Araminta).