private static Dictionary <int, List <HalfEdge> > GetHoles(this Geometry geometry, Face face) { var holes = new Dictionary <int, List <HalfEdge> >(); foreach (var he in face.InnerHalfEdges) { holes.Add(he, geometry.GetHalfEdgeLoop(he).ToList()); } return(holes); }
private static void CreateSidefaces(Geometry geometry) { var unboundedFace = geometry.GetFaceByHandle(1); //The unbounded face is always added first - therefore it will always have 1 as handle. var frontLoopsStartHalfEdges = unboundedFace.InnerHalfEdges.Take(unboundedFace.InnerHalfEdges.Count / 2).ToList(); var backLoopsStartHalfEdges = unboundedFace.InnerHalfEdges.Skip(unboundedFace.InnerHalfEdges.Count / 2).ToList(); for (var i = 0; i < frontLoopsStartHalfEdges.Count; i++) { var frontEdgeLoop = geometry.GetHalfEdgeLoop(frontLoopsStartHalfEdges[i]).ToList(); var backEdgeLoop = geometry.GetHalfEdgeLoopReverse(backLoopsStartHalfEdges[i]).ToList(); var newHalfEdges = new List <HalfEdge>(); var newFaces = new List <Face>(); for (var j = 0; j < frontEdgeLoop.Count; j++) { var halfEdgeFront = frontEdgeLoop[j]; var halfEdgeInBack = backEdgeLoop[j]; var backOriginVert = geometry.GetHalfEdgeByHandle(halfEdgeInBack.NextHalfEdge).OriginVertex; var frontOriginVert = geometry.GetHalfEdgeByHandle(halfEdgeFront.NextHalfEdge).OriginVertex; var newFromBack = new HalfEdge(geometry.CreateHalfEdgeHandleId()) { OriginVertex = backOriginVert, NextHalfEdge = halfEdgeFront.Handle, PrevHalfEdge = halfEdgeInBack.Handle }; var newFace = new Face(geometry.CreateFaceHandleId(), newFromBack.Handle); newFaces.Add(newFace); geometry.DictFaces.Add(newFace.Handle, newFace); newFromBack.IncidentFace = newFace.Handle; var newFromFront = new HalfEdge(geometry.CreateHalfEdgeHandleId()) { OriginVertex = frontOriginVert, NextHalfEdge = halfEdgeInBack.Handle, PrevHalfEdge = halfEdgeFront.Handle, IncidentFace = newFace.Handle }; halfEdgeFront.IncidentFace = newFace.Handle; halfEdgeFront.NextHalfEdge = newFromFront.Handle; halfEdgeFront.PrevHalfEdge = newFromBack.Handle; halfEdgeInBack.IncidentFace = newFace.Handle; halfEdgeInBack.NextHalfEdge = newFromBack.Handle; halfEdgeInBack.PrevHalfEdge = newFromFront.Handle; geometry.ReplaceHalfEdge(halfEdgeFront); geometry.ReplaceHalfEdge(halfEdgeInBack); newHalfEdges.Add(newFromBack); newHalfEdges.Add(newFromFront); } for (var j = 0; j < newHalfEdges.Count; j++) { var current = newHalfEdges[j]; if (j == 0) { current.TwinHalfEdge = newHalfEdges.Last().Handle; } else if (j == newHalfEdges.Count - 1) { current.TwinHalfEdge = newHalfEdges[0].Handle; } else if (j % 2 != 0 && j != newHalfEdges.Count - 1) //odd { current.TwinHalfEdge = newHalfEdges[j + 1].Handle; } else if (j % 2 == 0 && j != 0) //even { current.TwinHalfEdge = newHalfEdges[j - 1].Handle; } newHalfEdges[j] = current; geometry.DictHalfEdges.Add(current.Handle, current); } foreach (var face in newFaces) { geometry.SetFaceNormal(geometry.GetFaceOuterVertices(face.Handle).ToList(), geometry.DictFaces[face.Handle]); } } //Delete unbounded face geometry.DictFaces.Remove(unboundedFace.Handle); }