Converting coordinates after setting position of pointcloud to (0, 0, 0)

[Justin-Akridge]

I am trying to add in objects that were taken out of aerial lidar data so the coordinates are very high. I have to set the position of the pointcloud to zero in order to prevent the objects from flickering back forth (I assume is caused by arithmetic issues with large floating point numbers).

How can I convert the location of the objects in the load_poles function to match the new x, y, and z? The coordinates below represent the same location of a pole in the potree viewer before and after the conversion caused by setting the position of the pointcloud to (0,0,0).

//583,213.43 / 4,387,191.17 / 220.77
//39.79 / 83.30 / 2.86

async function loadPointCloud() {
    const metadata = await fetchMetadata(id);
    Potree.loadPointCloud(`${metadata}`, id, e => {
        pointCloud = e.pointcloud;
        pointCloud.position.set(0,0,0)
        viewer.scene.addPointCloud(pointCloud);
    })
}

function load_poles() {
  const poles = await response.json();    // these poles are very high coordinates. ex:   583,213.43 / 4,387,191.17 / 220.77
  poles.forEach(location => {
         const start = new THREE.Vector3(
              location.start_point[0],
              location.start_point[1],
              location.start_point[2]
        );
  
        const end = new THREE.Vector3(
              location.end_point[0],
              location.end_point[1],
              location.end_point[2]
        );
        addLineToScene(viewer, start, end);
   })
}