static PtBuffer onePathToIntervalsOfFixedLength(OnePath path, double segmentLength) {
  if (path == null) null;
  new PtBuffer out;
  
  int iPath = 0, lPath = path.size();
  var it = path.pointIterator();
  Pt p = it.next(), lastPoint = p;
  double carry = 0;
  while true {
    int iPath2 = iPath;
    double len = 0;
    while (it.hasNext() && (iPath2 == iPath
      || (len = p.minus(lastPoint).length()+carry)+.5 < segmentLength)) {
      p = it.next();
      iPath2++;
    }
    
    if (iPath2 == iPath) break;
    
    out.add(p);
    carry = segmentLength-len;
    printVars ifdef onePathToIntervalsOfFixedLength_debug(+segmentLength, +len, +lastPoint, +p, +carry);
    lastPoint = p;
  }
  ret out;
}