LOGIC — Physical Guardrails

Block Header: [LOGIC]
Parent Pillar: INTENT (The “Why” & Rules)
Production Phase: Phase 1: STAGING (Pre-Production Setup)
Placement: Block 2 (Diegetic Spatial & Physical Guardrails)

1. Purpose & Functional Role

[LOGIC] delivers direct, unpadded spatial and physical constraints for the video model’s visual planning and reasoning layer. It compensates for known generative weaknesses (spatial drift, object permanence loss, 180° axis confusion, hand-tracking errors, state resets) by locking the physical laws and continuity invariants of the scene before motion is calculated.

2. The Directorial Invariant: Diegetic Physics vs. Meta-Prompting

[LOGIC] governs the diegetic reality of the fictional world being filmed. It must never be confused with meta-instructions about script generation:

Category Status Concrete Directorial Focus
In-Scene Diegetic Physics MANDATORY • 180° axis & screen direction (Elias Frame-L, Felix Frame-R)
• Prop hand-allocation (brass key in right hand across cuts)
• Match-on-action cuts between wide and tight angles
• Directional light beam physics and wind consistency
Meta-Script Instructions STRICTLY PROHIBITED • “Make sure to write 15 macro-states and 4 shots”
• “Follow Auteur Script formatting rules”
• “Keep dialogue concise under 20 words”

[!WARNING] Zero Meta-Prompt Bleed: Never allow user instructions about script length, shot counts, or formatting rules to enter [LOGIC]. Downstream video generation models render physical pixels and motion; meta-prompt text confuses the visual reasoning layer and degrades visual fidelity.

3. Formatting & Syntax Rules

  • Header: [LOGIC] on its own line.
  • Strict Paragraph Mandate (Zero Bullets): Written as exactly ONE (1) continuous, dense paragraph (1–4 concise sentences, hard budget: 30–65 words). Never format [LOGIC] as bullet points (- ... or * ...) or numbered lists.
  • Affirmative Imperative Language: Use strong, unambiguous positive commands:
    • Ensure…
    • Maintain…
    • Preserve…
    • Prioritize…
    • Track…
    • Anchor…
  • Positive Constraints over Negative Phrasing: Video reasoning models respond significantly better to affirmative physical instructions (“Preserve continuous hand-tracking of the keys; maintain strict 180-degree axis with Samira anchored frame-left”) rather than negative prohibitions (“Don’t lose the keys, no sudden angle flips”).

4. Core Guardrail Domains

Focus exclusively on physical, spatial, and continuity mechanics:

  1. Spatial Geography & 180° Axis:
    • Establish the primary axis of action between subjects and enforce consistent screen direction and matching eyelines across reverse cuts.
  2. Prop Permanence & Hand-Specific Tracking:
    • Enforce continuous tracking of critical objects across cuts, specifying exact hand allocations and transfer mechanics.
  3. Lighting & Physical Consistency:
    • Lock physical light source behavior (e.g., flashlight beams, sweeping headlights) and environmental physics (e.g., wind direction, rain on surfaces).
  4. Performance & Match-on-Action:
    • Mandate grounded physical acting, realistic movement velocity, and seamless match-on-action cuts between wide, medium, and close-up angles.

5. The Pre-Visualization Directorial Protocol

In filmmaking, a script supervisor writes continuity notes based on the scene’s choreography.

When generating an Auteur Script: 1. Pre-Visualize Execution First: The AI director must mentally simulate the execution timeline (\(S_1 \mapsto S_n\)) first—identifying which props get handed off, where characters sit, and where camera angles change. 2. Formulate Invariant Guardrails Second: With the scene’s spatial choreography clearly pre-visualized, write the [LOGIC] paragraph to lock down those exact physical continuity challenges.

6. Verified Production Script Exhibits

❌ Incorrect (Meta-Prompt Leak & Bullet Points):

[LOGIC]
- Make sure to create 15 macro-states with 4 camera setups.
- Ensure the prompt follows Auteur Script formatting rules.
- Dialogue should be kept short and natural.

✅ Exhibit 1: Intimate Drama Scene (scripts/seedance25_dialogue_script.md):

[LOGIC]
Ensure strict spatial continuity on the bench, maintaining a clear 180-degree axis, consistent eye lines, and precise prop transfer tracking from Samira's coat pocket into Felix's hand.

✅ Exhibit 2: Rapid Multi-Location Ensemble Teaser (scripts/token_mapping_script.md):

[LOGIC]
Maintain absolute spatial symmetry, centered compositions, and eye-level camera placements throughout. Preserve rigid 180-degree axis discipline, crisp match-on-action cuts, and deadpan facial immobility between edits, ensuring props and wardrobe items remain locked across location transitions.

7. System Mechanism & Downstream Relations

  • State System Role: Acts as the Invariant Constraint Matrix (\(\mathcal{C}\)) governing the state-transition function \(f\) in \(S_n = f(S_{n-1} \mid \text{STAGING})\).
  • Upstream Input: Inherits narrative identity, genre, and world parameters from [INTENT].
  • Downstream Interface:
    • To [OPENING]: Enforces valid starting geometry (\(S_0\)), ensuring initial composition obeys the 180° axis and prop hand allocations.
    • To [EXECUTION]: Acts as a continuous reasoning fence during active generation, forbidding unmotivated axis flips, ghost props, spatial teleportation, or unprompted condition resets.
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