如何检查2个dbids是否在2D绘图中相交？

Question

我有一个二维绘图，如果所有 dbId 与当前 dbId 相交，我需要从它们中提取属性。

这样就够了:

function checkIntersect(dbId1, dbId2){
  return intersect ? true : false
}

我该怎么做？

Answer 1

尝试使用以下方法找到两个节点的二维边界（边界框）：

function get2DBoundsSample( dbId, model, useInstancing ) {

    //const it = model.getData().instanceTree;

    const fragList = model.getFragmentList();



    let bounds = new THREE.Box3();

    let bc = new Autodesk.Viewing.Private.BoundsCallback( bounds );

    const dbId2fragId = model.getData().fragments.dbId2fragId;

    const fragIds = dbId2fragId[dbId];



    if( Array.isArray( fragIds ) ) {

        for( let i = 0; i < fragIds.length; i++ ) {

            find2DBoundsSample( fragList, fragIds[i], dbId, useInstancing, bc );

        }

    } else if( typeof fragIds === 'number' ) {

        find2DBoundsSample( fragList, fragIds, dbId, useInstancing, bc );

    }

    function find2DBoundsSample( fragList, fragId, dbId, useInstancing, bc ) {

    const mesh = fragList.getVizmesh( fragId );

    if(mesh.geometry){

        const vbr = new Autodesk.Viewing.Private.VertexBufferReader( mesh.geometry, useInstancing );

        vbr.enumGeomsForObject( dbId, bc );

    }

    else{

        console.log('Mesh Geometry undefined. DBID: ',dbId, fragId, useInstancing);

      }

    }

    return bc.bounds;

}

然后测试两个框是否相交Box3.isIntersectionBox()

如何检查2个dbids是否在2D绘图中相交？

How to check whether 2 dbids intersect in 2D drawing?

javascript

autodesk-forge

autodesk-viewer