# Pattern

![](/files/-LfQUgHRTw3C0JGNsq_E)

```d
//Length of smallest side
side = 1;

//Number of modules (X)
nx = 8;

//Number of modules (Y)
ny = 8;

//The module is a square with an inscribed regular Octagon and another smaller Octagon within
//The dimension of the square side is equal to twice the Apothem of the Larger Octagon
//The length of the large Octagon side is twice the length of the smaller Octagon

//The Apothem of the larger Octagon is calculated
a = side/(2*Math.Tan(180/8));

//The circumradius of the large Octagon
r = a/(Math.Cos(180/8));

//Points for one module
//Corner Points of Bounding Square
pnt01 = Point.ByCoordinates({2*a,-2*a,-2*a,2*a},{2*a,2*a,-2*a,-2*a});
//Midpoints of large Octagon sides
pnt02 = (Point.Origin()).Translate(Vector.XAxis(),2*a).Rotate(Point.Origin(),Vector.ZAxis(),45..360..45);
//Corner Points of Large Octagon
pnt03 = (Point.Origin()).Translate(Vector.XAxis(),2*r).Rotate(Point.Origin(),Vector.ZAxis(),22.5..337.5..45);
//Corner Points of Small Octagon
pnt04 = (Point.Origin()).Translate(Vector.XAxis(),r).Rotate(Point.Origin(),Vector.ZAxis(),22.5..337.5..45);

//Square Corner Triangulation
tri11 = Transpose({List.TakeEveryNthItem(pnt03,2,1),List.TakeEveryNthItem(pnt02,2,1),pnt01});
tri12 = Transpose({List.TakeEveryNthItem(pnt02,2,1),pnt01,List.TakeEveryNthItem(pnt03,2,0)});

//Large Octagon Triangulation
tri13 = Transpose({pnt02,pnt03,pnt04});
tri14 = Transpose({List.ShiftIndices(pnt03,-1),List.ShiftIndices(pnt02,-1),List.ShiftIndices(pnt04,-1)});
tri15 = Transpose({pnt02,pnt04,List.ShiftIndices(pnt04,-1)});
tri16 = Transpose({List.ShiftIndices(pnt03,-1),List.ShiftIndices(pnt02,0),List.ShiftIndices(pnt04,-1)});

//Small Octagon Triangulation
tri17 = List.AddItemToFront(Point.Origin(),Transpose({pnt04,List.ShiftIndices(pnt04,1)})<1>);

//Three point groups for module
triPt = List.Flatten({tri11,tri12,tri13,tri14,tri15,tri16,tri17},1);

//Grid
pnts1 = Point.ByCoordinates((2*a..#nx..4*a)<1>,(2*a..#ny..4*a)<2>);

//Place instances of the points module at grid points.
cdSy1 = CoordinateSystem.ByOrigin(pnts1);
pat01 = triPt.Transform(cdSy1<1><2>);

```


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