# Review

Let’s recap the full arc of Operation Attic Containment.

## What You Built

You built a chain of evidence rather than a visual effect:

```text
connect ovphysx
  → run a baseline drop test (rigidBodyCount: 0)
  → launch targeted SimReady validation (run targets)
  → route report findings into guarded, visualized fixes (run fixes)
  → author a scene-level PhysicsScene and prove the rehearsal
  → pick up the physical world and package a reusable skill
```

Starting from a static viewport, you integrated `ovphysx` and ran a first drop test that proved the solver was alive but the scene had no usable rigid bodies. You turned “physics is broken” into a structured SimReady report, routed the `RB.MB.001` finding into a guarded repair that preserved protected sources, authored an explicit `PhysicsScene`, and pressed **Play** to prove the Memory Cube falls through C-9’s open top, contacts its floor and walls, and settles inside the acceptance region - all through the same Attic Portal.

## Key Takeaways

- **Same four lines drove every step:** Goal, Skills, Context, Done when. The only thing that changed was the skills you pointed the agent at.
- **A motionless frame is a symptom, not a diagnosis.** A live solver can still report `rigidBodyCount: 0`; runtime probes separate “physics is connected” from “the scene has usable bodies.”
- **SimReady turns failure into a contract.** Validation replaces “physics is broken” with a named target, *Profile and version*, *Requirement ID*, *authored location*, and reproducible finding.
- **Repairs must be guarded and non-destructive.** `run fixes` stays disabled until real, current evidence exists; corrections author separate `*_Fixed.usda` outputs while protected sources stay byte-for-byte unchanged.
- **A scene needs an explicit `PhysicsScene`.** Gravity, up axis, and scale are a reviewable contract, not an unstated default - and the collider overlay keeps C-9 open at the top.
- **Approve the rehearsal, not the picture.** Only runtime telemetry, a containment result, a persistent OVD report, and reproducibility prove behavior; the application owns the loop where `ovphysx` steps, `ovrtx` renders, and `ovstream` transports.
- **Interaction expresses intent.** The physics picker routes pointer input through `ovstream` and `ovphysx` instead of writing a transform directly, then returns authority to the solver on release.

## Mission Debrief

Before declaring the scene ready, make sure you can answer:

1. Why can a live `ovphysx` solver still report `rigidBodyCount: 0`?
2. What fields turn “physics is broken” into an actionable SimReady report?
3. What was the *Requirement ID*, *authored location*, and repair owner?
4. Why must `run fixes` stay disabled until a current report exists, and why author separate `*_Fixed.usda` outputs?
5. Why does the composed rehearsal need an explicitly authored `PhysicsScene`?
6. What did the second drop test prove that static SimReady validation did not?
7. What evidence beyond a convincing fall is required to approve a run?
8. Why must the physics picker express intent rather than write a transform directly?

## What Comes Next

More courses are on the way - *Blender, Oranges, and OVRTX: Not Your Typical Smoothie* brings RTX rendering and physics into Blender with Omniverse libraries, and *Isaac Sim and the Fine Art of Picking Things Up* drives a robot through a validated pick-and-place task. Check back soon.

In the meantime, explore the [Resources](https://docs.nvidia.com/learning/physical-ai/physical-ai-agent-bootcamp/latest/resources.md) to keep building.