Lesson 211: Fab 8K Texture Import and Playtest Surface Isolation Capstone (2026)

Direct answer: Q4 post-shipping closes when Fab fest art passes Godot 8K ORM compress preflight (texture_import_receipt_v1.json) and playtest invite URLs cannot be mistaken for fest_public store links (playtest_surface_isolation_receipt_v1.json). This capstone wires both receipts plus a q4_post_shipping_capstone_v1.json summary on one BUILD_RECEIPT row—after Lessons 206–210.

Why this matters now (Fab velocity + fest visibility)

July 2026 teams merge Fab kits while toggling Steam Playtest visibility toward October fest_public. Two failures stack:

1. Godot editor hang on first 8K ORM open—fixed upstream in guide preflight, must appear on BUILD_RECEIPT before fest scene promotion (Lesson 204 metallic gate is separate).
2. Playtest invite links pasted into Discord #announcements beside fest store URL—facilitators file bugs against the wrong depot (playtest isolation playbook owns playtest_isolation_receipt_v1.json; this lesson adds playtest_surface_isolation_receipt_v1.json for URL/channel leak discipline).

Help #11 (8K ORM hang fix when published) complements guide #6; this lesson is the course capstone for the 206–211 arc.

Beginner path (55-minute capstone)

Time: ~55 minutes when preflights exist; 80 minutes first Fab import + scope audit.

Developer path (gates K1–K8)

texture_import_receipt_v1.json (inherit from guide)

Do not re-author—copy path from Godot 8K preflight. Capstone adds fest scene path audit:

{
  "fest_scene_orm_paths": [
    "res://art/fest/hero_sword_orm_2k.png"
  ],
  "source_8k_archived_only": true
}

playtest_surface_isolation_receipt_v1.json

{
  "schema": "playtest_surface_isolation_receipt_v1",
  "build_label": "fest-portfolio-2026-10-rc3",
  "surfaces": {
    "playtest_invite": {
      "url": "https://store.steampowered.com/playtest/APPID",
      "build_label": "playtest-2026-07-rc1",
      "marketing_allowed": false
    },
    "fest_public": {
      "url": "https://store.steampowered.com/app/APPID",
      "build_label": "fest-demo-2026-10-rc1",
      "marketing_allowed": true
    }
  },
  "url_leak_audit": {
    "discord_pins_playtest_only_in_playtest_channel": true,
    "fest_announcement_contains_playtest_url": false,
    "itch_public_not_used_for_playtest_password": true
  },
  "paired_playtest_isolation_receipt": "release-evidence/playtest/PLAYTEST_ISOLATION_RECEIPT.json",
  "gates": {
    "K3_scope_map": "pass",
    "K4_build_label_separation": "pass",
    "K5_isolation_receipt": "pass",
    "K6_surface_url_audit": "pass"
  },
  "promotion_allowed": true
}

Difference from playtest_isolation_receipt: blog receipt proves depot/I1–I6 gates; surface receipt proves URLs and marketing channels do not cross-leak.

q4_post_shipping_capstone_v1.json

{
  "schema": "q4_post_shipping_capstone_v1",
  "arc_lessons": ["206", "207", "208", "209", "210", "211"],
  "receipts": {
    "206": "facilitator_contract_receipt_v1.json",
    "207": "ffmpeg_concat_decision_receipt_v1.json",
    "208": "cors_hosting_decision_receipt_v1.json",
    "209": "localization_receipt_matrix_v1.json",
    "210": "gif_capsule_marketing_receipt_v1.json",
    "211_texture": "texture_import_receipt_v1.json",
    "211_surface": "playtest_surface_isolation_receipt_v1.json"
  },
  "gates": {
    "K1_texture_import": "pass",
    "K2_orm_metallic": "pass",
    "K3_scope_map": "pass",
    "K4_build_labels": "pass",
    "K5_playtest_isolation": "pass",
    "K6_surface_isolation": "pass",
    "K7_arc_receipts": "pass",
    "K8_capstone": "pass"
  },
  "fest_promotion_allowed": true
}

Pin under release-evidence/capstone/Q4_POST_SHIPPING_CAPSTONE.json.

BUILD_RECEIPT capstone row

Thursday row review — add Capstone section listing 206–211 pass/fail n/a.

Prerequisites

• Lesson 204 — Fab ORM metallic
• Godot 8K ORM compress guide
• Lesson 206 — facilitator contract
• Playtest isolation playbook
• 12-free playtest isolation runbooks

Common mistakes

• Promoting fest scene while fest .tscn still references *_orm_8k.png.
• Same build_label on playtest and fest rows “for simplicity.”
• Pasting playtest invite in #fest-marketing channel.
• Skipping Lesson 204 because compress preflight passed—metallic can still be flat.

Troubleshooting

Mini exercise (70 minutes)

1. Archive 8K ORM to art_src/ only; link 2K in fest scene.
2. Pass texture import receipt from guide output.
3. Intentionally paste playtest URL in fest draft—confirm K6 fails.
4. Fix channels; file surface isolation receipt.
5. Assemble q4_post_shipping_capstone_v1.json with paths 206–210.

Continuity — Q4 arc close (206–211)

Next: Lesson 212 — save slot label receipt (H1 2026 arc open). July H2 200–205 and Q4 206–211 arcs are complete.

FAQ

Replace playtest_isolation_receipt?
No—file both. Isolation receipt is depot gates; surface receipt is URL/marketing leak audit.

Unity-only studio?
Texture gate n/a; surface isolation still required if Steam playtest + fest_public coexist.

Capstone blocks Lesson 204 ORM work?
K2 requires 204 GREEN before fest art promotion—compress alone is insufficient.

Fab art and fest URLs share one promotion gate—the capstone receipt proves you checked both before October traffic.