获取分组在ifcgroup中的元素的guid

Question

IFCJS的API中是否有一个函数可以获取分组在ifcgroup中的元素的guid？例如，如果我用墙对一列进行分组

getElementsFromIfcGroup(guidGroup) ---> return [guidWall, guidColumn]

Answer 1

根据IFC模式，IfcGroup实例使用名为IfcRelAssignsToGroup的间接关系对象将元素分组在一起。这意味着您可以检索该组中包含的元素，如下所示：

import { IFCRELASSIGNSTOGROUP as REL } from 'web-ifc';
async function getItemsOfGroup(modelID, groupID) {
const manager = ifcLoader.ifcManager;
const relIDs = await manager.getAllItemsOfType(modelID, REL);
for(relID of groupsIDs) {
const groupRel = await manager.getItemProperties(modelID, relID);
if(groupRel.RelatingGroup.value === groupID) {
return groupRel.RelatedObjects;
}
}
return [];
}

Answer 2

根据Antonio的回答，它看起来是这样的：

async function getItemsOfGroup(modelID, groupID) {
const manager = viewer.IFC.loader.ifcManager
// Get all ifcgroups
const relIDs = await manager.getAllItemsOfType(modelID, IFCRELASSIGNSTOGROUP);
let relID, relObj, props;
var guIDs = [];
for(relID of relIDs) {
const groupRel = await manager.getItemProperties(modelID, relID);
// Find the groupID
if(groupRel.GlobalId.value === groupID) {
// Search all related objects 
for(relObj of groupRel.RelatedObjects) {
//get object properties 
props = await manager.getItemProperties(modelID, relObj.value);
//Add guid to array
guIDs[guIDs.length] = props.GlobalId.value;
}
return guIDs;
}
}
return guIDs;
}