getEdgeVector method
Get a vector along an edge.
Implementation
void getEdgeVector(int edgeIndex, Vec3 vectorStore) {
final va = _getEdgeVectorVa;
final vb = _getEdgeVectorVb;
getEdgeVertex(edgeIndex, 0, va);
getEdgeVertex(edgeIndex, 1, vb);
vb.vsub(va, vectorStore);
}