int dy = Math.abs(posY - lastMouseY) / 2;
PickRenderResult[] results = view.pick(canvas, x, y, dx, dy);
// TODO : find the closest in all pick paths, loop on all closests
if ((results!=null) && (results.length>0)) {
Node nodes[] = results[0].getNodes();
if (nodes!=null) {
Object o = nodes[0].getUserData();
if (o instanceof ActiveNode) {
((ActiveNode)o).highlight(true,nodes[0]);
lastPickSelection.add(o);