iTwin 几何属性获取

面积体积半径

获取几何属性，如面积，体积，半径，可以使用getMassProperties这个接口

async onGetMassProperty(){
      const vp = IModelApp.viewManager.selectedView;
      const iModel = vp?.iModel;
      if (!iModel) return;
      console.log("iModel.selectionSet.elements", iModel.selectionSet.elements);
      const volumeResult = await iModel.getMassProperties({
        operation: MassPropertiesOperation.AccumulateVolumes,
        candidates:  Array.from(iModel.selectionSet.elements),
      });
      const areaResult = await iModel.getMassProperties({
        operation: MassPropertiesOperation.AccumulateAreas,
        candidates: Array.from(iModel.selectionSet.elements),
      });
      const lengthResult = await iModel.getMassProperties({
        operation: MassPropertiesOperation.AccumulateLengths,
        candidates: Array.from(iModel.selectionSet.elements),
      });
      console.log("volumeResult", volumeResult);
      console.log("areaResult", areaResult);
      console.log("lengthResult", lengthResult);
    },

位置相关

range，origin，rotation等

async getPlacement(){
      const vp = IModelApp.viewManager.selectedView;
      const iModel = vp?.iModel;
      if (!iModel) return;      
      const placements = await iModel.elements.getPlacements(
        iModel.selectionSet.elements
      );
      console.log("placements", JSON.stringify(placements));
    },

placements [{"origin":[34.199960548813415,7.3376951500380025,0],"angles":{"roll":136.25855192488035,"yaw":-2.6355965215330106},"bbox":{"low":[-3.329577892100504,-3.329577892100506,-3.3295778921005064],"high":[3.3295778921005077,3.329577892100506,3.3295778921005064]},"elementId":"0x20000000047"}]

几何图元具体信息

GeometryStreamIterator

// 打开snapshot测试
import { IModelHost, SnapshotDb, StandaloneDb} from "@itwin/core-backend"
import { GeometryStreamIterator } from "@itwin/core-common";
IModelHost.startup();
const iModel = SnapshotDb.openFile("../assets/geometry.bim");
const value = iModel.elements.getElementProps({ id: '0x20000000049', wantGeometry: true });
console.log("ElementProps",JSON.stringify(value));
const it = new GeometryStreamIterator(value.geom, value.category);
const primitiveGeometry = [];

 for (const entry of it) {    
     primitiveGeometry.push(entry.primitive);
}
console.log("PrimitiveGeometry:", JSON.stringify(primitiveGeometry));

Tips：5.0后不可以直接用snapshot，上述仅为实例