Make model animation controls reach the promised state

Inventory the actual delivered clips

List the clip identifiers in the delivery candidate and describe what each is supposed to show. Record the initial pose, intended ending pose, moving parts and whether the clip is a demonstration or a state-changing action. Do not assume an artist’s filename communicates this contract to the implementation owner. A clip named “open” could depict opening and closing in one sequence or could end with the object fully open.

The model-viewer animation examples document named animation selection, single playback with a finished event, crossfading between animations and a configured animation’s first frame when paused. These are viewer behaviors to account for, not a guarantee that a particular asset and interface implement the desired state machine. Keep the reviewed viewer version and delivered clip list together.

Define transitions in terms of visible outcomes

Write one row for each offered control: current state, allowed action, intended transition, completion evidence and next available actions. Include initial load and reset. If the reader selects another action during movement, decide whether the interface should queue it, interrupt it or explain that it is temporarily unavailable. The decision should be deliberate and tested rather than an accidental consequence of how quickly someone clicks.

Separate a requested action from a completed state. A button press can begin movement without establishing that the final pose has been reached. Decide when labels, explanatory text and highlighted parts should change. For a demonstrative exploded view, for example, a label should not imply the product is assembled while its parts remain separated. This is a communication contract as much as an animation implementation detail.

Test interruption, replay and competing movement

Run the normal sequence, then repeat it with interruptions near the beginning, middle and end. Test replay after completion, pause and resume where offered, a reset during movement and a switch to another supported clip. Use a harmless fixture and record the action sequence so the technical owner can reproduce it. Check the visible pose together with labels and control availability; a status message alone is not sufficient evidence.

Watch for blended poses that were never approved, components left behind by another clip and residual movement after the interface declares completion. When two animations are intentionally simultaneous, specify which parts each may affect and review their combined result. Do not solve a conflict by randomly reducing transition duration until one recording looks acceptable. Identify the conflicting state or component and retest the relevant transitions after repair.

Accept a recoverable interaction rather than a perfect recording

Confirm that the reader can return to a known, understandable state after each supported sequence. Reset should have a defined result for both the model and surrounding explanation. Reopen the delivered asset from a clean start and compare it with the state reached after several interactions. A system that works only on the first attempt has not passed an interactive acceptance test.

Keep the transition table, failing and corrected sequences, clip revision and acceptance limits with the delivery package. If a combination cannot behave reliably, simplify the offered controls or use a clearly labeled demonstration rather than promising arbitrary manipulation. Retest when clips or interface logic change, even if the model geometry is untouched. The accepted output is a set of supported transitions whose visible results match their descriptions.

Make the reasoning concrete.

A fictional stationery brand animates a desk box with separate opening and closing clips. A tester presses close halfway through opening. The label changes to “closed,” but a blended pose leaves the lid partly raised.

The brand selects the explicit transition rule and tests reset and replay as well. It approves the supported behavior, not an assumption that every clip can combine with every other clip.

Take the questions into your next brief.

Use these prompts in your own notes. Nothing is submitted from this page.

1. Clips

   What initial and final pose does each delivered clip actually contain?

2. Contract

   What action is allowed from each state, including during movement?

3. Confirmation

   What evidence establishes that the promised visible state has been reached?

4. Interruption

   Which repeatable sequences expose blending or stale-label failures?

5. Recovery

   How does the reader return to a known model and interface state?

Watch for the wrong conclusion.

• Equating a button press with successful completion.
• Testing only uninterrupted playback from a fresh load.
• Approving a state label without inspecting the actual pose.

Sources & scope

Workflows, worksheets and fictional examples are original editorial analysis. Sources support only specifically attributed principles. Platform guidance can change; legal requirements depend on jurisdiction and context. No measured results or named human reviewer are claimed.

• model-viewer: Animation examples →Primary viewer documentation · Supports: The examples document named clips, play-once completion, crossfading and the configured first-frame paused pose. The transition contract and fictional case are original analysis.