Docs: Bathynaut helmet Synty-match + in-game body-swap session log + cookbook 14-E
Session log for the 07-24 character work. Adds cookbook 14-E: the per-instance _BaseColor override gotcha (hit-flash sets URPMaterialPropertyBaseColor=(1,1,1) on player/enemy render children, replacing the material _BaseColor -> flat null-map materials render cream; color via a solid _BaseColorMap texture). Corrects the older 'clear the map -> uses _BaseColor' note. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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title: 2026-07-24_Bathynaut_Helmet_Synty_Ingame_Bodyswap
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type: note
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permalink: gamevault/07-sessions/2026/2026-07-24-bathynaut-helmet-synty-ingame-bodyswap
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---
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# 2026-07-24 — Bathynaut: Mark-V helmet Synty-match + in-game body-swap
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Continuation of the character overhaul. Two operator gates: **"the helmet doesn't match the Synty art
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style, it looks jarring"** → restyle; then **"go ahead, the character is approved"** → put it in the
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gameplay player. Both shipped + verified live.
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## Helmet: AI-gen → Synty-match (staging)
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The AI-generated (Hyper3D Rodin) Mark-V arrived photoreal + high-poly + single-textured — it clashed with
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the flat-shaded low-poly Synty suit. Also the first decimation (0.10 collapse) **tore holes** in the mesh.
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Fixes (banked in `/art-dev` cookbook §14):
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- **Watertight decimate:** weld doubles + recalc normals + delete loose FIRST, then a gentle 0.18 collapse
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→ 23k→1090 tris with **0 boundary edges** (the hole detector). Aggressive collapse on un-welded gen
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geometry is what shattered it.
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- **Drop the photoreal texture → shared flat palette:** re-materialled with the suit's OWN materials
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(`M_Diver_Brass` bonnet + `M_Diver_HelmetMetal` valve/collar/bezel + a teal `M_Diver_Porthole` glass),
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flat-shaded for chunky facets. Shares the suit's materials → cohesion guaranteed; the teal porthole ties
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into the bioluminescent palette. GLB 1.7 MB → 736 KB.
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- **Scale gotcha earlier the same day:** the meter-scale gen mesh skinned to the cm-scale (0.01) rig
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imported at ~5 mm (invisible) with a bad bindpose → made it a **rigid** (non-skinned) attachment, scale
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0.25 → ~0.5 m. (Commits `059458db8`, `69685a665`, `be55683f1`.)
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## In-game body-swap (the shipping animated Player.prefab)
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The `.blend` body/armour are pose-baked static (staging only, can't export as a skinned body) — so the swap
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works on the **in-engine Synty rest-pose skinned rig** that already animates. Torso/head bones sit at rest
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(only the arms are posed), so re-skinning the torso/head kit pieces is valid.
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- **Re-exported the skinned kit FBX** dome-less (metal 2157→1092 v — the old dome is gone) + the Mark-V
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skinned to `Head` (3 submeshes brass/gunmetal/glass). Re-ran `AttachBathynautKit` (proven `GraftSmr`
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rebase) → grafted metal + beacon + Mark-V; deleted the orphaned old porthole.
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- **Material split:** armour → brass, body → dark-teal undersuit, tanks → gunmetal, beacon → warm,
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Mark-V → brass/gunmetal/teal-glass.
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- **★ per-instance `_BaseColor` gotcha (cost a cycle):** every player render child carries a
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`URPMaterialPropertyBaseColor = (1,1,1)` override (hit-flash system) that **REPLACES** the material
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`_BaseColor`. So flat-`_BaseColor` + null `_BaseColorMap` rendered the whole diver **cream/white**. Fix =
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drive colour from a **solid-colour `_BaseColorMap` texture** (`DiverTex/T_Diver_*.png`), leave
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`_BaseColor` white; the instance override just multiplies (flash still works). Diagnosed by reading the
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live LEG children. Corrects the older "clear the map → uses `_BaseColor`" note (only true without the
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override). → cookbook §14-E.
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- **Verified live in DevSandbox from the game camera:** copper Mark-V + brass armour + dark-teal undersuit
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+ gunmetal tanks + warm beacon, animated, reads at true game scale. Commit `9f9c3b07b`.
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## Tooling scare
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A range-format `apply_text_edits` on `PlayerRigTools.cs` (from a **stale** 932-line read; the file is 931 —
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they coincidentally matched, but the range still) **truncated the file 931→808 lines**, deleting
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`GraftSmr`'s body. Recovered via `git checkout HEAD -- PlayerRigTools.cs`. Lesson: the harness Read can lag
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the true file; ground line numbers against `execute_code` disk-read or MCP `find_in_file`, and prefer a
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whole-`oldText` match over blind line ranges.
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## Follow-ups (flagged, not silently dropped)
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- **Silhouette broadening** (shoulders ×1.17 / boots ×1.14) is on the staging `.blend` armour but NOT
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in-game yet — the in-game armour is the stock Synty mesh. It already reads heavy (brass plate + tank
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pack); the broadening is a subtle enhancement via a vertex-edit on a skinned armour-mesh copy. Offered.
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- **`PlayerRigTools` material drift:** `AttachBathynautKit` still assigns placeholder materials
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(`M_Skinned_Palette`/`mGlow`); the correct diver materials are set post-hoc on the prefab. A re-run
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reverts them. Bake the correct per-SMR + Mark-V multi-material assignment into the tool when convenient
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(deferred after the truncation scare — didn't want more C# surgery same session).
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- The grafted helmet SMR is named `SM_Suit_Helmet_MarkV_EXP` (the export dup name) — cosmetic.
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