对Autodesk Forge有点熟悉的朋友可能都听过 viewer-navigation.sample 这个样例，他是Autodesk Forge官方第一个针对小地图这个需求推出的样例，他的执行画面长得像下面这样：
看到这里，你可能会想说直接拿他的代码来套用，但这样就不太妙了。因为他最主要的数据来源 rac.json 是手动产生、写死的 (hard-code)，没办法套用在其他模型。
//https://github.com/Autodesk-Forge/viewer-navigation.sample/blob/master/www/rac.json
{
"racsimple": {
"viewboxes": [
{
"box": [
61.30275909098552,
572.8253921735151,
411.29704813713875,
251.63262845992332
],
"floor": 0
},
{
"box": [
411.29704813713875,
572.8253921735151,
718.0903793548525,
251.63262845992332
],
"floor": 1
}
],
"floorHeight": 10,
"floorBase": -5,
"scale": 3.0529685252835925,
"yoffset": 305.5828538654896,
"xoffset": 173.35610564383717,
"paperZ": -0.8462999999999852
},
"racadvanced": {
"viewboxes": [
{
"box": [
147.11470672360943,
708.9971656430058,
876.6206449475018,
167.1180614813956
],
"floor": 0
}
],
"floorHeight": 10,
"floorBase": -17,
"scale": 3.0487993483101437,
"yoffset": 438.1741498717732,
"xoffset": 742.2887834445044,
"paperZ": -1.1969100000000026
}
}所幸在Autodesk开发部的同事们的努力下，小伙伴们呼声最大的 Forge Viewer原生小地图 (Minimap)功能终于释出了，借助AecModelData.json，感谢赞叹 BIM360 开发团队！他的执行画面长得像下面这样：
现在我们就来看看要怎么使用这个小地图扩展 (Autodesk.AEC.Minimap3DExtension)，下面是加载步骤及注意事项：
- 上传
RVT文檔到Forge Model Derivative转换SVF。 - 在 viewer 里加载
Autodesk.AEC.Minimap3DExtension扩展前调用Document.downloadAecModelData()确保AECModelData.json数据有被加载。 - 在 viewer 里加载
Autodesk.AEC.Minimap3DExtension - 切换导览工具到第一人称模式
注意1：这个样例使用到了另一个 Autodesk.AEC.LevelsExtension 扩展，用来进行楼层剖切
注意2：仅只持Revit 2018及之后版本的RVT文檔，
注意3：模型必须在 2019 年 5 月之后转换才会生成 AecModelData.json，在这之前的转换的模型可以透过在转换请求的标头加上 x-ads-force: true 参数来重新转换
- 样例代码：
Autodesk.Viewing.Initializer(options, () => {
const div = document.getElementById('forgeViewer');
const config = { extensions:[
'Autodesk.AEC.LevelsExtension',
'Autodesk.AEC.Minimap3DExtension'
]};
viewer = new Autodesk.Viewing.Private.GuiViewer3D(div, config);
viewer.start();
Autodesk.Viewing.Document.load(`urn:${urn}`, (doc) => {
var viewables = doc.getRoot().getDefaultGeometry();
doc.downloadAecModelData();
viewer.loadDocumentNode(doc, viewables).then( onLoadFinished );
viewer.addEventListener( Autodesk.Viewing.TEXTURES_LOADED_EVENT, ()=>{
viewer.getExtension('Autodesk.BimWalk').activate();
});
});
-
AecModelData.json的样例内容：
{
"version": "1.0.0",
"documentId": "89238809-6583-4ac2-a83a-29a2c04bc7b7",
"phases": [
{
"name": "Existing"
},
{
"name": "New Construction"
}
],
"levels": [
{
"guid": "e3e052f9-0156-11d5-9301-0000863f27ad-00000137",
"name": "01 - Entry Level",
"elevation": 0,
"height": 12.467191601054822,
"extension": {
"buildingStory": true,
"structure": false,
"computationHeight": 3.9370078740157473,
"groundPlane": false,
"hasAssociatedViewPlans": true
}
},
{
"guid": "458c0e49-01bb-11d5-9302-0000863f27ad-000002b6",
"name": "02 - Floor",
"elevation": 12.467191601054822,
"height": 12.467191601044725,
"extension": {
"buildingStory": true,
"structure": false,
"computationHeight": 3.9370078740157473,
"groundPlane": false,
"hasAssociatedViewPlans": true
}
},
{
"guid": "e755b16e-7be3-4a21-978e-6b4aa426b0a4-00021496",
"name": "03 - Floor",
"elevation": 24.934383202099546,
"height": 12.46719160104987,
"extension": {
"buildingStory": true,
"structure": false,
"computationHeight": 3.9370078740157473,
"groundPlane": false,
"hasAssociatedViewPlans": true
}
},
{
"guid": "e755b16e-7be3-4a21-978e-6b4aa426b0a4-00021642",
"name": "Roof",
"elevation": 37.401574803149416,
"height": 1.968503937008066,
"extension": {
"buildingStory": true,
"structure": false,
"computationHeight": 0,
"groundPlane": false,
"hasAssociatedViewPlans": true
}
},
{
"guid": "e755b16e-7be3-4a21-978e-6b4aa426b0a4-0002175f",
"name": "Parapet",
"elevation": 39.37007874015748,
"height": 2147483647,
"extension": {
"buildingStory": true,
"structure": false,
"computationHeight": 0,
"groundPlane": false,
"hasAssociatedViewPlans": false
}
}
],
"scopeBoxes": [],
"refPointTransformation": [
1,
0,
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],
"levelOccluderIds": [
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],
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"hasBreaks": false,
"sheetGuid": "951810cc-7a73-4765-9179-f5744ba5d821-0003406e",
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"viewType": "FloorPlan",
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"scale": 100,
"sectionBox": {
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},
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