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Record a demonstration

Goal: record your hand movements and voice while you operate a machine.

Set up the scene​

  1. Open ALF > Content Creation > Motion > Demonstration Recorder.

    ALF menu with Content Creation > Motion > Demonstration Recorder highlighted

  2. Under Step 1: Choose Your Demonstration Target, choose the Demonstration Target Mode:

    • Virtual Machine: drag the machine from the Hierarchy into Virtual Machine Object. Tick Enable Passthrough if you want to see your room around it.
    • Physical Machine: drag the object that marks the real machine's position into Physical Anchor Transform.

  3. Under Step 2: Inject Your Scene Recording Rig, press Inject Recording Rig into Scene.

    This adds the hand-tracking setup and a recording menu on your wrist. It replaces any other player setup in the scene, for example one from Scene Generation, so there's only one.

  4. Under Step 3, open Verify Headset Settings Before Recording and go through the checklist.

  1. Connect the Quest 3 to the computer with a USB-C cable, or use Air Link.
  2. In the headset, open Quick Settings and select Quest Link.
  3. Under Step 4: Record Your Live Demonstration, type a Recording Clip Name, for example Start the pump. Tick Record voiceover audio with microphone to record your voice.
  4. Press Play in Unity.
  5. Put on the headset. Look at your free wrist: the recording menu appears there.
  6. Poke Start Recording. After a 3-second countdown, recording starts.
  7. Operate the machine naturally and explain each step out loud.
  8. Poke Stop Recording. The recording is saved, and the menu shows how well your hands were tracked.

You can also start and stop the recording from the tool window with ● Start Recording Session and ■ Stop Recording.

Result​

The .json and .wav files are in Assets/Use Cases/Recordings. Open Project Recordings Folder under Step 5 shows them.

Next: Create the playback for learners. Proceed to Scenario Authoring → takes you there with the same settings.

Tips for a good recording​

  • Keep your hands in front of you, where the headset cameras can see them. Looking away from your hands interrupts tracking.
  • Move a little slower than usual. Learners need to follow.
  • Do one task per recording. Short recordings are easier to watch and repeat.
  • Check the tracking result on your wrist after stopping. If it's low, record again.

Good to know​

  • Mark a moment by hand. While recording, type a Marker Name in the window and press Trigger Action Marker, for example when the machine should react to something it can't detect itself.
  • Remove the setup again with Remove Rig from Scene. Re-link Anchor & Menu to Rig refreshes it after you change the machine.
  • Setting up the scene doesn't work in Play mode. Stop Play mode to inject or remove the rig.