Autodesk Forge Viewer How to get coordinates of line start/stop

Question

I am trying to do room highlighting in forge viewer.

In revit I have created lines that represent the borders of a room. After conversion to svf I know the dbids of tho

Answer 1

This is what I ended up doing. Note make sure the model is finished loading before calling instanceTree. Also in my case the dbid and fragid where one to one, not sure if this will always be the case in the instance tree.

function getFragIdFromDbId(viewer, dbid) {
 var returnValue;
 var it = viewer.model.getData().instanceTree;
 it.enumNodeFragments(dbid, function (fragId) {
  console.log("dbId: " + dbid + " FragId : " + fragId);
  returnValue = fragId;
 }, false);
 return returnValue;
}

...

// only need the start vertex
var floatArray = [];
for (var i = 0; i < dbidArray.length; i++) {
var fragId = getFragIdFromDbId(viewer, dbidArray[i]);
var mesh = viewer.impl.getRenderProxy(viewer.model, fragId);
var matrixWorld = mesh.matrixWorld;
var lmvBufferGeometry = mesh.geometry;
var lmvFloatArray = lmvBufferGeometry.vb; //this will have an array of 6  values 0,1,2 are start vertext , 3,4,5 are end vertex

floatArray.push(lmvFloatArray[0]);
floatArray.push(lmvFloatArray[1]);
floatArray.push(lmvFloatArray[2]);

}
//use matrixWorld to convert array to worldSpace