public static void Cell633() { TilingConfig config = new TilingConfig(6, 3, maxTiles: 20000); Tiling tiling = new Tiling(); tiling.GenerateInternal(config, Polytope.Projection.VertexCentered); double edgeLength = Honeycomb.EdgeLength(6, 3, 3); double z = 0.25; double offset = H3Models.UHS.ToEHorizontal(edgeLength, z); double scale = offset / tiling.Tiles.First().Boundary.Segments.First().Length; foreach (Tile tile in tiling.Tiles) { tile.Transform(Mobius.Scale(scale)); } Vector3D dummy; double radius; H3Models.UHS.Geodesic(new Vector3D(0, 0, z), new Vector3D(scale, 0, z), out dummy, out radius); Vector3D midradius = H3Models.UHSToBall(new Vector3D(0, 0, radius)); double temp = midradius.Z; double temp2 = (1 - temp) / 2; double temp3 = temp + temp2; double temp4 = temp3; Vector3D circumradius = H3Models.UHSToBall(new Vector3D(0, 0, z)); temp = circumradius.Z; temp2 = (1 - temp) / 2; temp3 = temp + temp2; temp4 = temp3; // Checking /* * Vector3D test = new Vector3D( offset, 0, z ); * test = H3Models.UHSToBall( test ); * double edgeLength2 = DonHatch.e2hNorm( test.Abs() ); * edgeLength2 += 0; */ HashSet <H3.Cell.Edge> edges = new HashSet <H3.Cell.Edge>(); foreach (Tile tile in tiling.Tiles) { foreach (Segment seg in tile.Boundary.Segments) { H3.Cell.Edge edge = new H3.Cell.Edge( H3Models.UHSToBall(seg.P1 + new Vector3D(0, 0, z)), H3Models.UHSToBall(seg.P2 + new Vector3D(0, 0, z))); edges.Add(edge); } } PovRay.WriteH3Edges(new PovRay.Parameters(), edges.ToArray(), "edges.pov"); }
// https://plus.google.com/u/0/117663015413546257905/posts/BnCEkdNiTZ2 public static void TwinDodecs() { Tiling tiling = new Tiling(); TilingConfig config = new TilingConfig(5, 3); tiling.GenerateInternal(config, Polytope.Projection.VertexCentered); // Vertex-centered makes infinities tricky Dodec dodec = new Dodec(); foreach (Tile tile in tiling.Tiles) { foreach (Segment seg in tile.Boundary.Segments) { Vector3D p1 = seg.P1, p2 = seg.P2; if (Infinity.IsInfinite(p1)) { p1 = Infinity.InfinityVector; } if (Infinity.IsInfinite(p2)) { p2 = Infinity.InfinityVector; } dodec.Verts.Add(p1); dodec.Verts.Add(p2); dodec.Midpoints.Add(Halfway(p1, p2)); } } // Now recursively add more vertices. HashSet <Vector3D> allVerts = new HashSet <Vector3D>(); foreach (Vector3D v in dodec.Verts) { allVerts.Add(v); } RecurseTwins(allVerts, dodec, 0); using (StreamWriter sw = File.CreateText("dual_dodecs_points_sphere.pov")) { foreach (Vector3D vert in allVerts) { Vector3D onSphere = Sterographic.PlaneToSphereSafe(vert); sw.WriteLine(PovRay.Sphere(new Sphere() { Center = onSphere, Radius = 0.01 })); //if( !Infinity.IsInfinite( vert ) ) // sw.WriteLine( PovRay.Sphere( new Sphere() { Center = vert, Radius = 0.01 } ) ); } } }
/// <summary> /// Get a distribution of points on a sphere. /// The points are the vertices of a geodesic dome. /// </summary> private static Vector3D[] SpherePoints() { List <Vector3D> spherePoints = new List <Vector3D>(); TilingConfig config = new TilingConfig(3, 5); Tiling tiling = new Tiling(); tiling.GenerateInternal(config); Tile baseTile = tiling.Tiles.First(); Vector3D[] templateTextureCoords = TextureHelper.TextureCoords(baseTile.Boundary, Geometry.Spherical, doGeodesicDome: true); foreach (Tile tile in tiling.Tiles) { Isometry isom = new Isometry(); isom.CalculateFromTwoPolygons(baseTile, tile, Geometry.Spherical); Vector3D[] textureCoords = Isometry.TransformVertices(templateTextureCoords, isom.Inverse()); spherePoints.AddRange(textureCoords); } return(spherePoints.Select(p => H3Models.UHSToBall(p)).Distinct().ToArray()); }
public static void Polarity() { TilingConfig config = new TilingConfig(3, 7, 50); Tiling tiling = new Tiling(); tiling.GenerateInternal(config); List <Vector3D> points = new List <Vector3D>(); List <H3.Cell.Edge> edges = new List <H3.Cell.Edge>(); foreach (Polygon p in tiling.Tiles.Select(t => t.Boundary)) { foreach (Segment s in p.Segments) { foreach (Vector3D v in s.Subdivide(25)) { Vector3D klein = HyperbolicModels.PoincareToKlein(v); H3.Cell.Edge e = Dual(klein); points.Add(klein); edges.Add(e); } } } using (StreamWriter sw = File.CreateText("polarity.pov")) { double rad = 0.01; foreach (Vector3D vert in points) { sw.WriteLine(PovRay.Sphere(new Sphere() { Center = vert, Radius = rad })); } foreach (H3.Cell.Edge edge in edges) { sw.WriteLine(PovRay.Cylinder(edge.Start, edge.End, rad / 2)); } } }