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版本：9.4.1

模型可见性设置

实现单个三维模型的显示与隐藏功能。

show
<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8"/>
    <title>模型可见性设置</title>
    <meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no"/>
    <style>
        body {
            margin: 0;
            padding: 0;
        }

        #map {
            position: absolute;
            top: 0;
            bottom: 0;
            width: 100%;
        }
        .btn-group {
            position: absolute;
            top: 20px;
            left: 20px;
        }
    </style>
    <script src="https://delivery.mapmost.com/cdn/sdk/webgl/v9.4.1/mapmost-webgl-min.js"></script>
</head>
<body>
<div id="map"></div>
<div class="btn-group">
    <select id="buildings">
        <option>建筑A</option>
        <option>建筑B</option>
    </select>
    <button onClick="showModel(true)">显示</button>
    <button onClick="showModel(false)">隐藏</button>
</div>
<script>
    let map = new mapmost.Map({
        container: 'map',  
        style: "<your style url>", 
        center: [120.67400351817594, 31.321374251251726], 
        zoom: 16, 
        pitch: 59.48725112156901, 
        bearing: -54.10626584095007,
        userId: '***', // 授权码 
        env3D: {
            defaultLight: true,
            exposure: 2.8,
            envMap: '../example_data/hdr/WhiteBG_Ref_1K.hdr'
        }
    });

    let modelGroup;
    map.on('load', function () {

        let models_obj = ["../example_data/jinji_plaza_eastern_door_building.glb", "../example_data/jinji_plaza_star_vista.glb"].map(item => ({
            type: 'glb',
            url: item
        }));

        let options = {
            id: 'model_id',
            type: 'model',
            models: models_obj,
            center: [120.67727020663829, 31.31997024841401],
            callback: function (group, layer) {
                modelGroup = group;
            }
        };
        map.addLayer(options);
    })

    function showModel(state) {
        let myselect = document.getElementById("buildings");
        let index = myselect.selectedIndex
        let name = myselect.options[index].text;
        if (modelGroup){
            if (name === "建筑A") {
                modelGroup.children[0].visible = state;
            } else {
                modelGroup.children[1].visible = state;
            }
        }

    }

</script>
</body>
</html>