同一IFC模型在BIM360与Forge中提取属性不一致问题

问题现象 #

将同一IFC模型分别上传至BIM360项目和Forge试用账户关联的存储桶，调用Model Derivative API提取属性时，返回结果存在明显差异：

BIM360返回的属性 #

{
    "externalId": "a",
    "name": "LaS_Progetto ANCHOR_DETACHED_VARCO PONTE DEI MILLE_send.ifc",
    "objectid": 1,
    "properties": {
        "IFC Properties": {
            "IFC Application Name": "Autodesk Revit 2021 (ENG)",
            "IFC Application Version": "2021",
            "IFC Schema": "IFC2X3",
            "IFC Time Stamp": "2022-06-10 15:31:22 +00:00",
            "Name": "IFC Properties"
        },
        "Item": {
            "Hidden": "No",
            "Icon": "File",
            "Material": "",
            "Name": "LaS_Progetto ANCHOR_DETACHED_VARCO PONTE DEI MILLE_send.ifc",
            "Required": "No",
            "Type": "File",
            "Unit": "Meters"
        },
        "Location": {
            "Elevation": "0.000 m",
            "Latitude": "44.414",
            "Longitude": "8.919",
            "Name": "Location Data",
            "ProjectLocation": "Default Site",
            "Timezone": "1.000"
        },
        "Project": {
            "IfcApplicationName": "Autodesk Revit 2021 (ENG)",
            "IfcApplicationVersion": "2021"
        }
    }
}

Forge存储桶返回的属性 #

{
    "externalId": "a",
    "name": "LaS_Progetto ANCHOR_DETACHED_VARCO PONTE DEI MILLE_send.ifc",
    "objectid": 1,
    "properties": {
        "Item": {
            "GUID": "0b0f2a01-1175-5780-810f-23d90f79b96a",
            "Hidden": "No",
            "Icon": "File",
            "Material": "",
            "Name": "LaS_Progetto ANCHOR_DETACHED_VARCO PONTE DEI MILLE_send.ifc",
            "Required": "No",
            "Type": "File",
            "Unit": "Meters"
        }
    }
}

问题原因与解决方案 #

• 差异与SVF2格式在Model Derivative中的数据提取逻辑相关
• 解决方式：调用Translate API时，添加conversionMethod参数并设置为"v3"，重新转换模型后，两边提取的属性即可保持一致

内容的提问来源于stack exchange，提问作者seva