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docs: week 3 task 3 thob notes (geometric consistency audit)

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Week-3/Task-3/thob/notes.md
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# Thob Observations: Week 3 Task 3 - UI ↔ 3D State Consistency Audit
### Thob Observations from Task Notes
* **Consistency Test**: Conducted 50+ rapid state-toggle cycles between UI RadioButtons and 4 3D primitives (**Sphere, Cube, Cylinder, Plane**).
* **State Persistence**: [PASS] Re-selecting the same option correctly maintains the visual state. Switching between the Sphere, Cube, Cylinder, and Plane remained consistent across all tests. Reloading/Revisiting the page state correctly restores the last selected configuration.
* **State Sync**: [PASS] Zero drift observed for Sphere, Cube, and Plane. The 3D viewport's visible state stayed in perfect sync with the UI selection indicator at all times during rapid toggling.
* **Critical Failure: Cylinder Crash**: [REPRODUCIBLE]. Selecting to **Hide/Toggle** the **Cylinder geometry** results in a hard application crash. This confirms a persistent internal failure in Thob's primitive management logic.
* **Main limitation observed**: **Unstable Geometric Primatives.** While most objects behave well, the Cylinder remains a high-risk component that crashes the entire builder session.
* **Reliability Verdict**: **Partially Reliable / Fragile** (Due to the Cylinder crash).
### Console Warnings/Errors Seen (Deduplicated) and Probable Meaning
1. **Hydration Noise**: `No HydrateFallback element provided`.
2. **State Initialization Delay**: `undefined is changing from uncontrolled to controlled`.
3. **Binding Redundancy**: `GetBindingData... method already registered`.
### Overall Read
Thob's UI-to-3D state engine is deterministic and visually reliable for standard objects like the Sphere and Cube. However, the **Cylinder geometry is fundamentally unstable** in the current build, making any product switcher involving cylinders highly risky for production use.