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Agent Instructions — App SpaceWarp

Unity sample demonstrating how to consume Application SpaceWarp (rendering every other frame while Horizon OS interpolates) and how to diagnose / mitigate common ASW artifacts.

Source-of-truth files (read these first, do not duplicate their contents in this file)

For setup, build steps, SDK versions, and project layout, read:

  • README.md — official setup, scene-by-scene artifact walkthrough, and ASW project settings
  • ProjectSettings/ProjectVersion.txt — Unity editor version
  • Packages/manifest.json — Unity package versions (notably the Oculus-VR Unity-Graphics fork git dependencies)
  • LICENSE — license terms (Text Mesh Pro files are under Unity Companion License)

Quest / Horizon-specific notes

  • Do not swap com.unity.render-pipelines.* away from the Oculus-VR/Unity-Graphics fork branch pinned in Packages/manifest.json — the upstream URP / Core / Shader Graph packages do not include the MotionVector pass changes ASW relies on, and opaque objects will appear to stutter without them.
  • Custom shaders must explicitly add a MotionVector pass (see the CustomShaders scene and OculusMotionVectorCore.hlsl); otherwise objects using those shaders will produce ASW artifacts even when behaving correctly visually.
  • Static-marked geometry must still emit motion vectors — handled automatically by the Oculus URP fork but a frequent gotcha when porting shaders.
  • Project Settings under XR Plug-in Management > Oculus must keep Phase Sync, Late Latching, and Symmetric Projection enabled for the intended ASW experience.
  • Use the motion-vector debug overlay and RenderDoc-Oculus to confirm objects render in the MotionVector pass when diagnosing artifacts.
  • Git LFS is recommended (git lfs install before cloning) per the README.

Meta Quest tooling

This is a Meta Quest / Horizon OS sample. The bespoke intro above is the source of truth for what this project is and how it's built — use it (and the files it points at) instead of restating facts from memory.

When the user asks anything about Quest device behavior, build / deploy / debug / capture flows, on-device performance, or Horizon OS APIs, reach for these tools instead of generic Unity answers:

  • hzdb — Quest-aware ADB wrapper (device list, install / launch / stop, logs, screenshots, Perfetto traces, on-device docs search). Already wired up as an MCP server via .mcp.json, .vscode/mcp.json, and .cursor/mcp.json. Also runnable directly: npx -y @meta-quest/hzdb <subcommand>.
  • Meta Quest Agentic Tools — the full skill set, including Unity-specific skills: https://github.com/meta-quest/agentic-tools. Install per your client (Claude Code: /plugin install meta-vr@meta-quest; Gemini CLI: gemini extensions install https://github.com/meta-quest/agentic-tools; Cursor / VS Code: install the Meta Horizon extension from the Marketplace).

A few behavior expectations:

  • Read this repo's files first. Before answering anything project-specific, read README.md and whichever source-of-truth files the intro above points at. Don't restate their contents in chat — quote or link instead.
  • Use hzdb for device-side work. Anything that touches an attached Quest (install, launch, logs, screenshot, capture, manifest inspection) goes through hzdb, not raw adb.
  • Check live Horizon OS docs before answering API questions. hzdb docs search "..." queries the live docs; training data on Horizon OS APIs goes stale fast.
  • Don't fabricate SDK / engine versions. If a version isn't visible in this repo's files, say so rather than guessing.