Energies energies = box.getEnergies();
int neighbourCount = neighbours.size();
for (EdgeSpring edge : neighbours) {
if (!edge.ignored) {
NodeParticle other = edge.getOpposite(this);
Point3 opos = other.getPosition();
delta.set(opos.x - pos.x, opos.y - pos.y, is3D ? opos.z - pos.z
: 0);
double len = delta.normalize();