近期有在关注 Forge 的朋友应该有注意到 Forge Viewer 终于推出原生的楼层剖切扩展 (Autodesk.AEC.LevelsExtension) 和小地图扩展 (Autodesk.AEC.Minimap3DExtension) 如下图：
在使用这两个扩展时有个大前提，都需要加载一个叫 AecModelData.json 的文檔，但这个文檔只有在Viewer在线模式下通过 Viewer3D#loadDocumentNode 加载模型，才能够通过 Document#downloadAecModelData 加载，并通过 BubbleNode#getAecModelData 获取，所以有许多 Forge 的小伙伴在咨询有没有什么办法可以在本地模式下也能获取 AECModelData 数据？
所幸，我们Forge开发技术支持团队的黄老师提出了一个不错的解方；在开始说明前，我们先看完整代码样例长什么样子：
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"hasThumbnail": "true",
"status": "success",
"progress": "complete",
"region": "US",
"urn": "dXJuOmFkc2sub2JqZWN0czpvcy5vYmplY3Q6c2IyMzMzMzMzL3Jldml0aG91c2UucnZ0",
"version": "1.0",
"derivatives": [
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"name": "revithouse.rvt",
"hasThumbnail": "true",
"status": "success",
"progress": "complete",
"outputType": "svf",
"children": [
{
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"role": "Autodesk.CloudPlatform.PropertyDatabase",
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"status": "success"
},
{
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"role": "Autodesk.AEC.ModelData",
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"mime": "application/json",
"status": "success"
},
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]
},
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]
},
{
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"phaseNames": "Learning Content",
"status": "success",
"hasThumbnail": "true",
"progress": "complete",
"children": [
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"urn": "urn:adsk.viewing:fs.file:dXJuOmFkc2sub2JqZWN0czpvcy5vYmplY3Q6c2IyMzMzMzMzL3Jldml0aG91c2UucnZ0/output/Resource/Sheet/A105 - Elev__ Stair Sections 958251/dwfx/A105 - Elev__ Stair Sections4.png",
"resolution": [
400,
400
],
"mime": "image/png",
"status": "success"
},
{
"guid": "db90b95d-0265-5fe4-376a-4dd3386c3d7d",
"type": "resource",
"role": "graphics",
"mime": "application/autodesk-f2d",
"status": "success",
"urn": "urn:adsk.viewing:fs.file:dXJuOmFkc2sub2JqZWN0czpvcy5vYmplY3Q6c2IyMzMzMzMzL3Jldml0aG91c2UucnZ0/output/8c15d5f2-9aa1-61e6-77a7-61e08633eb4f_f2d/primaryGraphics.f2d"
},
{
"guid": "eb6a5fb3-d049-4cfb-bf32-1a8a22dc31c8",
"type": "view",
"role": "2d",
"name": "Sheet: A105 - Elev./ Stair Sections",
"viewbox": [
0,
0.023889,
839.999999,
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]
}
]
},
{
"guid": "e9248f2e-7bb7-4baf-8541-afac7b6872de-000ea29f",
"type": "geometry",
"role": "2d",
"name": "A101 - Site Plan",
"viewableID": "e9248f2e-7bb7-4baf-8541-afac7b6872de-000ea29f",
"phaseNames": "Working Drawings",
"status": "success",
"progress": "complete",
"properties": {
"Print Setting": {
"Layout": "Landscape",
"Paper size": "ISO A4, 210 x 297 mm"
}
},
"hasThumbnail": "true",
"children": [
{
"guid": "ccaa45fd-a10e-aa0a-1bc4-4ce456f6356f",
"type": "resource",
"role": "thumbnail",
"urn": "urn:adsk.viewing:fs.file:dXJuOmFkc2sub2JqZWN0czpvcy5vYmplY3Q6c2IyMzMzMzMzL3Jldml0aG91c2UucnZ0/output/Resource/Sheet/A101 - Site Plan 959135/dwfx/A101 - Site Plan1.png",
"resolution": [
100,
100
],
"mime": "image/png",
"status": "success"
},
{
"guid": "6e8928d6-0ea0-80d3-e66d-2815cee64d1c",
"type": "resource",
"role": "thumbnail",
"urn": "urn:adsk.viewing:fs.file:dXJuOmFkc2sub2JqZWN0czpvcy5vYmplY3Q6c2IyMzMzMzMzL3Jldml0aG91c2UucnZ0/output/Resource/Sheet/A101 - Site Plan 959135/dwfx/A101 - Site Plan2.png",
"resolution": [
200,
200
],
"mime": "image/png",
"status": "success"
},
{
"guid": "dfe3c27a-0757-fe54-ed61-984456235f87",
"type": "resource",
"role": "thumbnail",
"urn": "urn:adsk.viewing:fs.file:dXJuOmFkc2sub2JqZWN0czpvcy5vYmplY3Q6c2IyMzMzMzMzL3Jldml0aG91c2UucnZ0/output/Resource/Sheet/A101 - Site Plan 959135/dwfx/A101 - Site Plan4.png",
"resolution": [
400,
400
],
"mime": "image/png",
"status": "success"
},
{
"guid": "1fd6b2ec-267d-8ba3-6b00-abe1adf80994",
"type": "resource",
"role": "graphics",
"mime": "application/autodesk-f2d",
"status": "success",
"urn": "urn:adsk.viewing:fs.file:dXJuOmFkc2sub2JqZWN0czpvcy5vYmplY3Q6c2IyMzMzMzMzL3Jldml0aG91c2UucnZ0/output/72d0413b-08ca-d1b5-2af2-60a9e588793b_f2d/primaryGraphics.f2d"
},
{
"guid": "8ea7bfa8-847d-455f-87cc-389b43124326",
"type": "view",
"role": "2d",
"name": "Sheet: A101 - Site Plan",
"viewbox": [
0,
0.023889,
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]
}
]
},
{
"guid": "666da4f5-76ba-443a-9fe6-0bcd8a1bcfe9-000ea416",
"type": "geometry",
"role": "2d",
"name": "A001 - Title Sheet",
"viewableID": "666da4f5-76ba-443a-9fe6-0bcd8a1bcfe9-000ea416",
"status": "success",
"progress": "complete",
"properties": {
"Print Setting": {
"Layout": "Landscape",
"Paper size": "ISO A4, 210 x 297 mm"
}
},
"hasThumbnail": "true",
"children": [
{
"guid": "a9589c82-05f3-6298-dbee-c6157a8d8bb8",
"type": "resource",
"role": "thumbnail",
"urn": "urn:adsk.viewing:fs.file:dXJuOmFkc2sub2JqZWN0czpvcy5vYmplY3Q6c2IyMzMzMzMzL3Jldml0aG91c2UucnZ0/output/Resource/Sheet/A001 - Title Sheet 959510/dwfx/A001 - Title Sheet1.png",
"resolution": [
100,
100
],
"mime": "image/png",
"status": "success"
},
{
"guid": "e8cdf870-7bc1-5d7c-bf7b-a1cdf1c15381",
"type": "resource",
"role": "thumbnail",
"urn": "urn:adsk.viewing:fs.file:dXJuOmFkc2sub2JqZWN0czpvcy5vYmplY3Q6c2IyMzMzMzMzL3Jldml0aG91c2UucnZ0/output/Resource/Sheet/A001 - Title Sheet 959510/dwfx/A001 - Title Sheet2.png",
"resolution": [
200,
200
],
"mime": "image/png",
"status": "success"
},
{
"guid": "53bfab17-2fa9-e9f2-c21e-cd466b3eecd9",
"type": "resource",
"role": "thumbnail",
"urn": "urn:adsk.viewing:fs.file:dXJuOmFkc2sub2JqZWN0czpvcy5vYmplY3Q6c2IyMzMzMzMzL3Jldml0aG91c2UucnZ0/output/Resource/Sheet/A001 - Title Sheet 959510/dwfx/A001 - Title Sheet4.png",
"resolution": [
400,
400
],
"mime": "image/png",
"status": "success"
},
{
"guid": "97e8b569-a295-8750-f788-2d5067608b9c",
"type": "resource",
"role": "graphics",
"mime": "application/autodesk-f2d",
"status": "success",
"urn": "urn:adsk.viewing:fs.file:dXJuOmFkc2sub2JqZWN0czpvcy5vYmplY3Q6c2IyMzMzMzMzL3Jldml0aG91c2UucnZ0/output/9c6e0f4b-edee-0c07-9f8d-fe90a92668fa_f2d/primaryGraphics.f2d"
},
{
"guid": "86896da4-be5c-465e-940b-465a2aeb326d",
"type": "view",
"role": "2d",
"name": "Sheet: A001 - Title Sheet",
"viewbox": [
0,
0.023889,
839.999999,
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]
}
]
}
]
},
{
"status": "success",
"progress": "complete",
"outputType": "thumbnail",
"children": [
{
"guid": "db899ab5-939f-e250-d79d-2d1637ce4565",
"type": "resource",
"role": "thumbnail",
"urn": "urn:adsk.viewing:fs.file:dXJuOmFkc2sub2JqZWN0czpvcy5vYmplY3Q6c2IyMzMzMzMzL3Jldml0aG91c2UucnZ0/output/preview1.png",
"resolution": [
100,
100
],
"mime": "image/png",
"status": "success"
},
{
"guid": "3f6c118d-f551-7bf0-03c9-8548d26c9772",
"type": "resource",
"role": "thumbnail",
"urn": "urn:adsk.viewing:fs.file:dXJuOmFkc2sub2JqZWN0czpvcy5vYmplY3Q6c2IyMzMzMzMzL3Jldml0aG91c2UucnZ0/output/preview2.png",
"resolution": [
200,
200
],
"mime": "image/png",
"status": "success"
},
{
"guid": "4e751806-0920-ce32-e9fd-47c3cec21536",
"type": "resource",
"role": "thumbnail",
"urn": "urn:adsk.viewing:fs.file:dXJuOmFkc2sub2JqZWN0czpvcy5vYmplY3Q6c2IyMzMzMzMzL3Jldml0aG91c2UucnZ0/output/preview4.png",
"resolution": [
400,
400
],
"mime": "image/png",
"status": "success"
}
]
}
]
}
Autodesk.Viewing.endpoint.getItemApi= (endpoint, derivativeUrn, api) => {
return 'https://sbhehe.github.io/sb233/house'+decodeURIComponent( derivativeUrn.split('Resource')[1])
};
Autodesk.Viewing.Initializer( { env:'Local' }, () => {
const viewerDocument = new Autodesk.Viewing.Document( manifestJsonObject );
viewerDocument.downloadAecModelData();
const config3d = {
extensions:[
'Autodesk.AEC.LevelsExtension',
'Autodesk.AEC.Minimap3DExtension'
]
};
const viewer = new Autodesk.Viewing.GuiViewer3D( document.body.children[0], config3d);
viewer.start();
viewer.loadDocumentNode(viewerDocument, viewerDocument.getRoot().getDefaultGeometry())
})首先, 第一步，我们需先将模型上载到 Forge 服务上进行转换，等待转换完成后，获取转换的Manifest，并把他存放在某处，像上面代码样例的 manifestJsonObject 写在JavaScript文檔里面，也可以把它存放在自己的数据存储、数据库什么的，在需要时通过 AJAX 请求获取。
第二步，我们需要将在线模式的 Viewer代码做个转换，从下面这个代码：
const options = {
env: 'AutodeskProduction'
//...
};
Autodesk.Viewing.Initializer(options, () => {
Autodesk.Viewing.Document.load( urn, viewerDocument => {
Viewer.loadDocumentNode( viewerDocument, geometry )
}
})转换成这个样子：
const options = {
env: 'Local'
//...
};
Autodesk.Viewing.Initializer(options, () => {
const viewerDocument = new Autodesk.Viewing.Document(manifestJsonObject) //从 Forge Model Derivative GET :urn/manifest 端点获取 manifest 物件
Viewer.loadDocumentNode( viewerDocument, geometry )
//...
})第三步，复写 viewer 的 getItem 方法：
Autodesk.Viewing.endpoint.getItemApi = ( endpoint, derivativeUrn, api ) => {
return '/path/to/model/'+decodeURIComponent( derivativeUrn.split('Resource')[1] ); //decode the URN and extract its path
}下面给小伙伴们举个例，
假设下载的 SVF 包放在网页服务器的 House文件夹里，且通过网络可以访问的地址是 https://sbhehe.github.io/sb233/house；那么，你的 /path/to/model/ 就会是 https://sbhehe.github.io/sb233/house
在来，AecModelData.json 文檔在 manifest的描述是：
{
"guid": "a4aac952-a3f4-031c-4113-b2d9ac2d0de6",
"type": "resource",
"role": "Autodesk.AEC.ModelData",
"urn": "urn:adsk.viewing:fs.file:dXJuOmFkc2sub2JqZWN0czpvcy5vYmplY3Q6c2IyMzMzMzMzL3Jldml0aG91c2UucnZ0/output/Resource/AECModelData.json",
"mime": "application/json",
"status": "success"
},则 derivativeUrn.split('Resource')[1] 的结果会是 /AECModelData.json
所以最后，
你需要确保你的 SVF 包的文件夹结构是类似下面这个样子：
/ House
|------> AecModelData.json
|------> Model.sdb
|------> /3D View
|------> /{3D} 960621
|------> {3D}.svf
|------> {3D}.png
|------> // 其他文檔或文件夹……………
|------> // 其他文檔或文件夹……………
|------> // 其他文檔或文件夹……………上面这些注意事项都做完之后，你就可以在本地模式下获取 AecModelData 数据，并正常使用 Forge Viewer原生的楼层剖切扩展和小地图扩展啦~
顺祝开发顺利！
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