HTML 模型元素入门

4:19 - Load a model

<!-- Using the src attribute -->
<model src="mallet.usdz"></model>

<!-- Using a <source> child for MIME type -->
<model>
    <source src="mallet.usdz" type="model/vnd.usdz+zip">
</model>

4:39 - Image fallback

<model id="mallet" src="mallet.usdz">
    <img src="mallet.png"
         alt="Rubber mallet with wooden handle">
</model>

5:09 - Ready promise

<model id="mallet" src="mallet.usdz"></model>

<script>
    const model = document.getElementById("mallet");
    model.ready.then(result => {
        // Hide the loading indicator
    }).catch(error => {
        // Loading failed, show fallback
    });
</script>

5:39 - Polyfill fallback

<script type="module">
    if (!window.HTMLModelElement) {
        import("model-element-polyfill.js").then(() => {
            // Polyfill ready to use
        });
    }
</script>

6:13 - Model background

<model id="mallet" src="mallet.usdz"></model>
<style>
    model {
        background-color: #f4f1ec;
    }
</style>

6:47 - Stage mode

<model id="mallet"
       src="mallet.usdz"
       stagemode="orbit">
</model>

7:31 - Custom transforms

<model id="boot" src="boot.usdz"></model>
<button id="button-side">Side</button>
<button id="button-reset">Reset</button>

<script>
    const model = document.getElementById("boot");
    const initialTransform = model.entityTransform;

    document.getElementById("button-side")
            .addEventListener("click", () => {
        const transform = new DOMMatrix();
        transform.rotateSelf(0, 135, 0);
        model.entityTransform = transform;
    });

    document.getElementById("button-reset")
            .addEventListener("click", () => {
        model.entityTransform = initialTransform;
    });
</script>

8:35 - Transition animation

<script>
    const model = document.getElementById("boot");
    const duration = 500;
    let currentAngle = 0;
    let animationId = null;

    function animateTo(targetAngle) {
        if (animationId) cancelAnimationFrame(animationId);
        const startAngle = currentAngle;
        const startTime = performance.now();

        function step(now) {
            const progress = Math.min((now - startTime) / duration, 1);
            const ease = 1 - Math.pow(1 - progress, 3);
            currentAngle = startAngle + (targetAngle - startAngle) * ease;
            model.entityTransform = new DOMMatrix().rotateSelf(0, currentAngle, 0);
            if (progress < 1) animationId = requestAnimationFrame(step);
        }

        requestAnimationFrame(step);
    }

    document.getElementById("button-side").addEventListener("click", () => animateTo(135));
    document.getElementById("button-reset").addEventListener("click", () => animateTo(0));
</script>

10:07 - Animation playback

<model id="bottle" src="bottle.usdz"></model>
<button id="button-play" onclick="play(5)">
    Play
</button>
<button id="button-reverse" onclick="play(-5)">
    Reverse
</button>

<script>
    const model = document.getElementById("bottle");

    function play(rate) {
        model.playbackRate = rate;
        model.play();
    }
</script>

11:06 - AR Quick Look

<a rel="ar" href="bottle.usdz">
    <model id="boot" src="bottle.usdz"></model>
</a>