W18G — background_image_smoke 20260526_1623_a5f245

Create an interior background image matching the referenced base floor plan region; use the FP as layout guidance, not as a visible overlay. Render the room from a natural standing eye-level perspective. Do not render any person, body, or corpse — depict only the room interior, fixtures, and the transient floor/window/surface cues described below.

A low-angle cinematic shot looking through the gap of bedroom A door (8) onto a dark wooden floor inside bedroom A (3). A wet, dark red floor stain zone (23) spreads across the boards, with a distinct footprint trail (19) leading past the bed toward long closed window curtains (12) that drape down to the floor (18). Cool night-blue darkness leaks from the window.

Layout follows fp_l05_01. Low-angle view looking through bedroom A door (8) into private bedroom A (3) showing a red floor stain zone (23) and a footprint trail (19) leading toward the curtain-side floor evidence zone (18).

----- background_prompt_region_appendix (W18E preview) -----

[background_prompt_region_appendix] Preview only — assembled deterministically from W18D payload.
Base FP image reference (layout / rooms / fixed anchors only): scripts_output/floor_plan_base_layout_image_smoke_slice_experiment/20260526_1500_0ab6ac/png/fp_l05_01.png
Do not redraw, relocate, or add transient overlay markers onto the base FP image; transient markers belong only in the background prose.
Target spatial units for this background:
  - #3 (private_bedroom_a) private bedroom A @ 10x10 rect [6,3,9,8]
Base markers visible on the base FP image:
  - #3 private bedroom A [base_structural_unit] @ 10x10 cell (7,5)
  - #8 bedroom A door [base_opening] @ 10x10 cell (6,5)
  - #12 bedroom A sliding window with curtains [base_opening] @ 10x10 cell (7,8)
Transient overlay markers to describe in the prose:
  - #18 curtain-side floor evidence zone [state_overlay_plot_cue] in unit 'private_bedroom_a' — overlay_hint: Depict a temporary floor evidence zone near the curtain side only when the selected background calls for it.
  - #19 footprint trail [state_overlay_plot_cue] in unit 'private_bedroom_a' — overlay_hint: Depict a temporary footprint trail across the bedroom floor only when the selected background calls for it.
  - #23 red floor stain zone [state_overlay_plot_cue] in unit 'private_bedroom_a' — overlay_hint: Depict a temporary red floor stain beside the bed area only when the selected background calls for it.

{
  "bg_id": "L05B04",
  "fp_id": "fp_l05_01",
  "model": "gpt-image-2",
  "size": "1024x1024",
  "prompt_text_len_chars": 2438,
  "rendering_preamble": "Create an interior background image matching the referenced base floor plan region; use the FP as layout guidance, not as a visible overlay. Render the room from a natural standing eye-level perspective. Do not render any person, body, or corpse — depict only the room interior, fixtures, and the transient floor/window/surface cues described below.",
  "assembled_preview_carried": true,
  "assembled_preview_len_chars": 2087,
  "base_fp_png_path": "/Users/manta/Documents/Projects/TheRoad-I1/scripts_output/floor_plan_base_layout_image_smoke_slice_experiment/20260526_1500_0ab6ac/png/fp_l05_01.png",
  "base_fp_png_exists": true,
  "png_relative_path": "png/L05B04.png",
  "status": "success",
  "png_size_bytes": 1464053,
  "actual_api_response_meta": {
    "latency_ms": 95166,
    "created": 1779780325
  },
  "error_meta": {},
  "cost_meta": {
    "provider_usage": {
      "input_tokens": 1608,
      "input_tokens_details": {
        "image_tokens": 1024,
        "text_tokens": 584
      },
      "output_tokens": 1756,
      "total_tokens": 3364,
      "output_tokens_details": {
        "image_tokens": 1756,
        "text_tokens": 0
      }
    }
  }
}

{
  "run_id": "20260526_1623_a5f245",
  "stage": "w18g_background_image_smoke_from_region_ref_slice",
  "plan_version": "bps_w1",
  "generated_at": "2026-05-26T16:23:50.037624+09:00",
  "args": {
    "derive_background_smoke_from": "scripts_output/background_prompt_region_ref_assembly_slice_experiment/20260526_1559_dfadc8",
    "target_bg_id": "L05B04",
    "generate": true,
    "model": "gpt-image-2",
    "output_root": "/Users/manta/Documents/Projects/TheRoad-I1/scripts_output/background_image_smoke_from_region_ref_slice_experiment",
    "diag_print_imports": false
  },
  "derived_from": "20260526_1559_dfadc8",
  "target_bg_id": "L05B04",
  "model": "gpt-image-2",
  "mode": "generated",
  "image_api_call_count": 1,
  "image_generation_count": 1,
  "outputs": [
    "background_image_smoke_result.json",
    "w18g_compatibility_report.json"
  ],
  "run_status": "succeeded",
  "exit_code": 0,
  "failed_invariants": [],
  "png_relative_path": "png/L05B04.png",
  "png_size_bytes": 1464053
}