HT for Web自定义3D模型的WebGL应用

有不少朋友询问《HTML5 Web 客户端五种离线存储方式汇总》文章例子的3D表计模型是如何生成的，这个例子是通过导入3dmax设计好的表计模型，然后通过obj格式导入到HT for Web系统中进行控制，这种方式特别适合复杂模型的应用场景，但对于监控系统的很多应用其实并不需要专业的美工使用专业的3D编辑工具，完全通过HT for Web预定义的和内置自定义3D模型API就能满足很多应用，这里介绍几种场景的自定义3D模型应用。

上图是采用HT提供的createRingModel函数，通过编辑2D的多边形生成对应的环状的3D模型，对于花瓶碗杯等环形对称的物体很适合采用该函数构建。除了createRingModel外，HT的建模手册中的custommodel自定义模型例子，还采用了createExtrusionModel等更多的自定义模型API构建了一个餐桌椅和墙面的场景，其效果如下：

HT内置的基础模型也有很多参数可调节设置出多种模型效果，参见HT建模手册的如下例子：

自定义模型还可用于构建如机房、机框、板卡和端口的常见电信网管监控模型：

该EMS设备管理系统例子3D模型和Tree组件通过HT强大灵活的模型与图形的数据绑定功能，从而实现树上自定义图标和3D自定义模型的数据共享，实时一致刷新效果，以下为该EMS例子的全部JavaScript代码：

function init(){
    dm = new ht.DataModel();
    treeView = new ht.widget.TreeView(dm);
    g3d = new ht.graph3d.Graph3dView(dm);
    mainSplit = new ht.widget.SplitView(treeView, g3d, ‘h‘, 0.2);   

    view = mainSplit.getView();
    view.className = ‘main‘;
    document.body.appendChild(view);
    window.addEventListener(‘resize‘, function (e) {
        mainSplit.invalidate();
    }, false);                         

    register2DImage();
    register3DModel();
    addModel(); 

    g3d.setGridVisible(true);
    g3d.setGridSize(30);
    g3d.setGridGap(50);
    g3d.setEye([200, 200, 600]);
    g3d.setCenter([0, 200, 0]);
    g3d.getView().style.background = ‘#F9F9F9‘;
    g3d.getLabel = function(data){
        return data.s(‘label‘);
    };
    dm.sm().setFilterFunc(function(data){
        return data !== wall;
    });
    treeView.setVisibleFunc(function(data){
        return data !== wall;
    });
    treeView.expandAll();
}

function register2DImage(){
    ht.Default.setImage(‘ems-frame‘, {
        width: 18,
        height: 18,
        comps: [
            {
                type: ‘rect‘,
                rect: [5, 4, 8, 11],
                borderWidth: 2,
                borderColor: ‘#34495E‘
            }
    ]});        

    ht.Default.setImage(‘ems-pane‘, {
        width: 18,
        height: 18,
        comps: [
            {
                type: ‘rect‘,
                rect: [0, 4, 18, 10],
                background: {func: ‘[email protected]‘}
            }
    ]});     

    ht.Default.setImage(‘ems-block‘, {
        width: 18,
        height: 18,
        comps: [
            {
                type: ‘circle‘,
                rect: [0, 2, 18, 10],
                background: {
                    func: ‘[email protected]‘,
                    value: ‘#3498DB‘
                }
            },
            {
                type: ‘rect‘,
                rect: [4, 14, 10, 3],
                background: {
                    func: ‘[email protected]‘,
                    value: ‘#3498DB‘
                }
            }
    ]});
}

function register3DModel(){
    ht.Default.setShape3dModel(‘ems-frame‘, ht.Default.createFrameModel(0.1, 0, 0.1, {top: true, bottom: true, back: true}));       

    ht.Default.setShape3dModel(‘ems-block‘, [
        {
            shape3d: ht.Default.createCylinderModel(32, 0, 32, false, false, true, true),
            r3: [Math.PI/2, 0, 0],
            color: {
                func: ‘[email protected]‘,
                value: ‘#3498DB‘
            }
        },
        {
            shape3d: ‘box‘,
            s3: [1, 0.2, 1],
            t3: [0, -0.7, 0],
            color: {
                func: ‘[email protected]‘,
                value: ‘#3498DB‘
            }
        }
    ]);
}

function addModel(){
    wall = new ht.Shape();
    wall.setName(‘Wall‘);
    wall.setPoints(new ht.List([
        {x: -750, y: 750},
        {x: -750, y: -750},
        {x: 750, y: -750},
        {x: 750, y: 750}
    ]));
    wall.setTall(400);
    wall.setElevation(200);
    wall.s({
        ‘shape.border.width‘: 5,
        ‘shape.border.color‘: ‘rgba(20, 20, 20, 0.8)‘,
        ‘shape.background‘: null,
        ‘all.color‘: ‘rgba(102, 192, 218, 0.95)‘,
        ‘all.transparent‘: true,
        ‘all.reverse.cull‘: true
    });
    dm.add(wall);                                               

    var frame = new ht.Node();
    frame.setName(‘Main Frame‘);
    frame.setIcon(‘ems-frame‘);
    frame.s3(120, 300, 120);
    frame.p3(0, 152, 0);
    frame.s({
        ‘shape3d‘: ‘ems-frame‘,
        ‘shape3d.color‘: ‘#34495E‘,
        ‘label‘: ‘www.hightopo.com‘,
        ‘label.color‘: ‘white‘,
        ‘label.background‘: ‘#3498DB‘,
        ‘label.position‘: 6,
        ‘label.t3‘: [-6, -54, 6],
        ‘label.r3‘: [0, Math.PI/4, Math.PI/2]
    });
    dm.add(frame);                                

    var colors = [‘#9C8CE7‘, ‘#00C59D‘, ‘#A741B6‘, ‘#F5C700‘, ‘#31485F‘, ‘#F81F25‘, ‘#00B862‘, ‘#3B7DA7‘];
    for(var i=0; i<6; i++){
        var pane = new ht.Node();
        pane.setIcon(‘ems-pane‘);
        pane.setName(‘Pane‘ + (i+1));
        pane.s3(108, 16, 8);
        pane.s({
            ‘shape3d‘: ‘box‘,
            ‘shape3d.color‘: ‘#ECF0F1‘
        });
        pane.setHost(frame);
        pane.setParent(frame);
        dm.add(pane);

        if(i < 2){
            for(var j=0; j<8; j++){
                var block = new ht.Node();
                block.setName(‘block ‘ + i + ‘*‘ + j);
                block.s3(8, 8, 12);
                block.p3(-39+j*11, 1, 0);
                block.setHost(pane);
                block.setParent(pane);
                block.setIcon(‘ems-block‘);
                block.s({
                    ‘shape3d‘: ‘ems-block‘
                });
                if(i === 1){
                    block.a({
                        ‘circleColor‘: colors[j],
                        ‘rectColor‘: ‘#00F2CF‘
                    });

                }
                dm.add(block);
            }
        }else{
            pane.setName(‘Pane‘ + (i+1) + ‘ [ Empty ]‘);
            pane.s({
                ‘shape3d.color‘: ‘#BDC3C7‘
            });
        }
        pane.p3(0, 265-i*27, 54);
    }
}