model-element-samples/jsorbit.html at main · immersive-web/model-element-samples · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Model: JS-Orbit test</title>
    <link rel="stylesheet" href="style.css" />
  </head>
  <body>
    <div class="container">
      <h1>Model: JS-Orbit test</h1>
      <hr />
      <p>
        A custom JavaScript-based demonstration of a behavior similar to the
        expectation for <code>stagemode="orbit"</code> provided by the UA.
      </p>
      <h2>Result</h2>

      <model alt="A model of a teapot">
        <source src="./teapot.usdz" type="model/vnd.usdz+zip" />
        <source src="./teapot.glb" type="model/gltf-binary" />
        <img
          src="./teapot-fallback-black.jpg"
          alt="An image of a model of a teapot" />
      </model>
      <div id="log"></div>
    </div>

    <script type="module">
      let startDragX, startDragY, omegaX, omegaY;

      const VERTICAL_DRAG_FACTOR = 7;
      const HORIZONTAL_DRAG_FACTOR = 5;
      const VERTICAL_RELEASE_DECAY = 0.9;
      const HORIZONTAL_RELEASE_DECAY = 0.94;
      const INPUT_SMOOTH_FACTOR = 0.85;

      let dx = 0;
      let dy = 0;
      let smoothDX = 0;
      let smoothDY = 0;
      let prevX = 0;
      let curX = 0;
      let vX = 0;
      let errors = {};

      let pointerDown = false;
      let initialXfo;

      function tick() {
        requestAnimationFrame(tick);
        try {
          if (!pointerDown) {
            dy *= VERTICAL_RELEASE_DECAY;
            vX *= HORIZONTAL_RELEASE_DECAY;
            dx += vX;
          }

          smoothDX =
            (1 - INPUT_SMOOTH_FACTOR) * dx + INPUT_SMOOTH_FACTOR * smoothDX;
          smoothDY =
            (1 - INPUT_SMOOTH_FACTOR) * dy + INPUT_SMOOTH_FACTOR * smoothDY;

          model.entityTransform = initialXfo
            .rotate(smoothDY / VERTICAL_DRAG_FACTOR, 0, 0)
            .rotate(0, smoothDX / HORIZONTAL_DRAG_FACTOR, 0);
        } catch (err) {
          errors[err.message] = errors[err.message] || 0;
          errors[err.message]++;
          log.innerText =
            'errors:' +
            Object.keys(errors)
              .map((type) => type + ':' + errors[type])
              .join('<br>');
        }
      }

      const model = document.querySelector('model');

      await model.ready;
      initialXfo = model.entityTransform;

      model.addEventListener('touchstart', (e) => {
        e.preventDefault();
        e.stopImmediatePropagation();
        document.body.classList.add('noscroll');
      });

      model.addEventListener('pointerdown', (e) => {
        pointerDown = true;
        startDragX = e.clientX - dx;
        startDragY = e.clientY;
        vX = 0;
      });

      window.addEventListener('pointermove', (e) => {
        if (pointerDown) {
          dx = e.clientX - startDragX;
          dy = e.clientY - startDragY;
          prevX = curX;
          curX = e.clientX;
        }
      });

      window.addEventListener('pointerup', (e) => {
        pointerDown = false;
        vX = curX - prevX;
      });

      requestAnimationFrame(tick);
    </script>
  </body>
</html>