void SetupHexagonalGrid()
        {
            // Make cell regions: we assume cells have only 1 region but that can change in the future
            int l = _numCells;
            int qx, qy;
            int q = (int)(Math.Sqrt (l));
            q = q * 12 / 13;
            if (q<1) q= 1;
            qx=qy=q;
            int qx2 = qx * 4 / 3;

            double stepX = (transform.localScale.y / transform.localScale.x) / qx;
            double stepY = (transform.localScale.x / transform.localScale.y) / qy;

            double halfStepX = stepX*0.5;
            double halfStepY = stepY*0.5;

            Segment [,,] sides = new Segment[qx2,qy,6]; // 0 = left-up, 1 = top, 2 = right-up, 3 = right-down, 4 = down, 5 = left-down
            int c = -1;
            int subdivisions = goodGridCurvature > 0 ? 3: 1;
            for (int j=0;j<qy;j++) {
                for (int k=0;k<qx2;k++) {
                    Point center = new Point((double)k/qx-0.5+halfStepX,(double)j/qy-0.5+halfStepY);
                    center.x -= k *  halfStepX/2;
                    Cell cell = new Cell( (++c).ToString(), new Vector2((float)center.x, (float)center.y));

                    double offsetY = (k % 2==0) ? 0: -halfStepY;

                    Segment leftUp =  (k>0 && offsetY<0) ? sides[k-1, j, 3]: new Segment(center.Offset(-halfStepX, offsetY), center.Offset(-halfStepX/2, halfStepY + offsetY), k==0 || (j==qy-1 && offsetY==0));
                    sides[k, j, 0] = leftUp;

                    Segment top = new Segment(center.Offset(-halfStepX/2, halfStepY + offsetY), center.Offset(halfStepX/2, halfStepY + offsetY), j==qy-1);
                    sides[k, j, 1] = top;

                    Segment rightUp = new Segment(center.Offset(halfStepX/2, halfStepY + offsetY), center.Offset(halfStepX, offsetY), k==qx2-1 || (j==qy-1 && offsetY==0));
                    sides[k, j, 2] = rightUp;

                    Segment rightDown = (j > 0 && k<qx2-1 && offsetY<0) ? sides[k+1,j-1,0]: new Segment(center.Offset(halfStepX, offsetY), center.Offset(halfStepX/2, -halfStepY + offsetY), (j==0 && offsetY<0)|| k==qx2-1);
                    sides[k, j, 3] = rightDown;

                    Segment bottom = j>0 ? sides[k, j-1, 1] : new Segment(center.Offset(halfStepX/2, -halfStepY + offsetY), center.Offset(-halfStepX/2, -halfStepY +offsetY), true);
                    sides[k, j, 4] = bottom;

                    Segment leftDown;
                    if (offsetY<0 && j>0) {
                        leftDown = sides[k-1, j-1, 2];
                    } else if (offsetY==0 && k>0) {
                        leftDown = sides[k-1, j, 2];
                    } else {
                        leftDown = new Segment(center.Offset(-halfStepX/2, -halfStepY+offsetY), center.Offset(-halfStepX, offsetY), true);
                    }
                    sides[k, j, 5] = leftDown;

                    if (j==0) {
            //						leftDown.CropBottom();
            //						bottom.CropBottom();
            //						rightDown.CropBottom();
                    }
                    if (k==qx2-1) {
                        top.CropRight();
                        rightUp.CropRight();
                        rightDown.CropRight();
                        bottom.CropRight();
                    }

                    Region cr = new Region (cell);
                    if (subdivisions>1) {
                        if (!top.deleted) cr.segments.AddRange (top.Subdivide(subdivisions, _gridCurvature));
                        if (!rightUp.deleted) cr.segments.AddRange (rightUp.Subdivide(subdivisions, _gridCurvature));
                        if (!rightDown.deleted) cr.segments.AddRange (rightDown.Subdivide(subdivisions, _gridCurvature));
                        if (!bottom.deleted) cr.segments.AddRange (bottom.Subdivide(subdivisions, _gridCurvature));
                        if (!leftDown.deleted) cr.segments.AddRange (leftDown.Subdivide(subdivisions, _gridCurvature));
                        if (!leftUp.deleted) cr.segments.AddRange (leftUp.Subdivide(subdivisions, _gridCurvature));
                    } else {
                        if (!top.deleted) cr.segments.Add (top);
                        if (!rightUp.deleted) cr.segments.Add (rightUp);
                        if (!rightDown.deleted) cr.segments.Add (rightDown);
                        if (!bottom.deleted) cr.segments.Add (bottom);
                        if (!leftDown.deleted) cr.segments.Add (leftDown);
                        if (!leftUp.deleted) cr.segments.Add (leftUp);
                    }
                    Connector connector = new Connector();
                    connector.AddRange(cr.segments);
                    cr.polygon = connector.ToPolygon(); // FromLargestLineStrip();
                    if (cr.polygon!=null) {
                        cell.region = cr;
                        cells.Add (cell);
                    }
                }
            }
        }
        void SetupBoxGrid(bool strictQuads)
        {
            // Make cell regions: we assume cells have only 1 region but that can change in the future
            int l = _numCells;
            int qx, qy;
            int q = (int)(Math.Sqrt (l));
            if (strictQuads) {
                qx=qy=q;
            } else {
                qx=l;
                qy=1;
                if (q<1) q=1;
                if ( (int)(q*q) != l) { // not squared
                    if (!GetTwoFactors(l, out qx, out qy)) {
                        // if number > 10 and it's prime, reduce by one so we can avoid ugly accordian grids
                        if (l>10) GetTwoFactors(l-1, out qx, out qy);
                    }
                } else {
                    qx = qy = q;
                }
            }
            double stepX = (transform.localScale.y / transform.localScale.x) / qx;
            double stepY = (transform.localScale.x / transform.localScale.y) / qy;

            double halfStepX = stepX*0.5;
            double halfStepY = stepY*0.5;

            Segment [,,] sides = new Segment[qx,qy,4]; // 0 = left, 1 = top, 2 = right, 3 = bottom
            int c = -1;
            int subdivisions = goodGridCurvature > 0 ? 3: 1;
            for (int k=0;k<qx;k++) {
                for (int j=0;j<qy;j++) {
                    Point center = new Point((double)k/qx-0.5+halfStepX,(double)j/qy-0.5+halfStepY);
                    Cell cell = new Cell( (++c).ToString(), new Vector2((float)center.x, (float)center.y));

                    Segment left = k>0 ? sides[k-1, j, 2] : new Segment(center.Offset(-halfStepX, -halfStepY), center.Offset(-halfStepX, halfStepY), true);
                    sides[k, j, 0] = left;

                    Segment top = new Segment(center.Offset(-halfStepX, halfStepY), center.Offset(halfStepX, halfStepY), j==qy-1);
                    sides[k, j, 1] = top;

                    Segment right = new Segment(center.Offset(halfStepX, halfStepY), center.Offset(halfStepX, -halfStepY), k==qx-1);
                    sides[k, j, 2] = right;

                    Segment bottom = j>0 ? sides[k, j-1, 1] : new Segment(center.Offset(halfStepX, -halfStepY), center.Offset(-halfStepX, -halfStepY), true);
                    sides[k, j, 3] = bottom;

                    Region cr = new Region (cell);
                    if (subdivisions>1) {
                        cr.segments.AddRange (top.Subdivide(subdivisions, _gridCurvature));
                        cr.segments.AddRange (right.Subdivide(subdivisions, _gridCurvature));
                        cr.segments.AddRange (bottom.Subdivide(subdivisions, _gridCurvature));
                        cr.segments.AddRange (left.Subdivide(subdivisions, _gridCurvature));
                    } else {
                        cr.segments.Add (top);
                        cr.segments.Add (right);
                        cr.segments.Add (bottom);
                        cr.segments.Add (left);
                    }
                    Connector connector = new Connector();
                    connector.AddRange(cr.segments);
                    cr.polygon = connector.ToPolygon(); // FromLargestLineStrip();
                    if (cr.polygon!=null) {
                        cell.region = cr;
                        cells.Add (cell);
                    }
                }
            }
        }