产品模块环绕揭示

<!-- motion-registry-context:{"format":"1.0.0","recipe_id":"device.product-orbit-reveal","recipe_version":"0.2.0","recipe_source":"recipes/device/product-orbit-reveal/recipe.yaml"} -->
# Motion Registry Context

<!-- motion-registry-section:recipe-identity:start -->
## Recipe identity
- Recipe ID: device.product-orbit-reveal
- Schema version: 0.2.0
- Recipe source: recipes/device/product-orbit-reveal/recipe.yaml
<!-- motion-registry-section:recipe-identity:end -->

<!-- motion-registry-section:motion-intent:start -->
## Motion intent and scope
- Purpose (zh): 带灯光反射和体积细节的程序化产品模块完成有限环绕并在正面停住。
- Purpose (en): A procedural product module with lit volumetric detail completes a finite orbit and settles front-on.
- Scope: shot
- Complexity: advanced
- Subjects: device
- Intents: demonstrate, reveal, emphasize
- Use cases: product-demo, advertising, social-video, presentation
- Recipe capabilities: procedural-product, orbit-camera, webgl-lighting, readable-front-hold
<!-- motion-registry-section:motion-intent:end -->

<!-- motion-registry-section:inputs:start -->
## Inputs
- product_label: string (required; default=SIGNAL MODULE) — Label rendered on the product module and caption.
- orbit_degrees: number (optional; default=32) — Bounded horizontal orbit angle before settling front-on.
- finish: enum (optional; default=amber; options=amber|cobalt) — Procedural product finish palette.
<!-- motion-registry-section:inputs:end -->

<!-- motion-registry-section:normalized-timeline:start -->
## Normalized motion timeline (0 to 1)
- 0.04–0.30 · product.reveal · opacity.fade → product · parameters={"from":0,"to":1}
- 0.08–0.66 · product.orbit · transform.rotate3d → product · parameters={"axis":"y","from":-32,"to":0,"unit":"deg"}
- 0.12–0.72 · orbit-camera.push · camera.push → orbit-camera · parameters={"from":0,"to":1,"curve":"ease-out"}
- 0.36–0.62 · caption.reveal · opacity.fade → caption · parameters={"from":0,"to":1}
- 0.76–1.00 · product.hold · state.hold → product · parameters={}
<!-- motion-registry-section:normalized-timeline:end -->

<!-- motion-registry-section:output-envelope:start -->
## Output envelope
- Aspect ratios: 16:9, 9:16, 1:1
- Duration: min 2.8s; preferred 4.2s; max 6s
<!-- motion-registry-section:output-envelope:end -->

<!-- motion-registry-section:acceptance:start -->
## Acceptance constraints
- real-volume: The product has visible front, side, and top surfaces with lighting response and is not a flat card.
- bounded-orbit: The orbit completes once and stops at a readable front angle without looping.
- deterministic: The same inputs produce identical geometry, camera path, materials, and final state.
- no-obstruction: Product and caption stay inside their responsive safe zones with no mutual overlap.
<!-- motion-registry-section:acceptance:end -->

<!-- motion-registry-section:handoff-invariants:start -->
## Handoff invariants
- Preserve the subject, input meaning, event order, overlaps, final state, and approximate normalized timing.
- Keep the implementation deterministic and retain a readable, stable final hold.
- Treat the Recipe document as the source of truth; do not infer engine APIs in this shared core.
<!-- motion-registry-section:handoff-invariants:end -->