/// <summary>
/// Calculates and saves the normal of the Face into its FaceData.
/// </summary>
/// <param name="faceOuterVertices">All vertices of the outer boundary of the Face.</param>
/// <param name="face">The Face the normal belongs to.</param>
public void SetFaceNormal(IList <Vertex> faceOuterVertices, Face face)
{
var normal = GeometricOperations.CalculateFaceNormal(faceOuterVertices);
var cur = DictFaces[face.Handle];
var faceData = face.FaceData;
faceData.FaceNormal = normal;
cur.FaceData = faceData;
DictFaces[face.Handle] = cur;
}
private static void CreateTopSurface(Geometry geometry, float zOffset, bool exturdeAlongNormal)
{
//Clone front face.
var backface = geometry.CloneGeometry();
if (!exturdeAlongNormal)
{
//Add zOffset to each vertex coordinate.
UpdateVertexZCoord(backface, zOffset);
}
else
{
var unbounded = backface.GetFaceVertices(1).ToList();
var normal = GeometricOperations.CalculateFaceNormal(unbounded);
UpdateVertexZCoord(backface, unbounded, normal, zOffset);
}
Join2DGeometries(geometry, backface);
}
private static Geometry ExtrudeFaceByHandle(Geometry geometry, int faceHandle, float offset, float3 extrusionVector)
{
var face = geometry.GetFaceByHandle(faceHandle);
//get HE of Face
var start = geometry.GetHalfEdgeByHandle(face.OuterHalfEdge);
var next = start;
var vertexIncHe = new Dictionary <int, List <HalfEdge> >();
var allFaceVertices = geometry.GetFaceVertices(faceHandle);
foreach (var vertex in allFaceVertices)
{
vertexIncHe.Add(vertex.Handle, geometry.GetVertexStartingHalfEdges(vertex.Handle).ToList());
}
var allH2NEdges = new List <HalfEdge>();
do
{
var nextOriginV = geometry.GetVertexByHandle(next.OriginVertex);
var newVertex = new Vertex(geometry.CreateVertHandleId(), nextOriginV.VertData.Pos);
var twinEdge = geometry.GetHalfEdgeByHandle(next.TwinHalfEdge);
var prevEdge = geometry.GetHalfEdgeByHandle(next.PrevHalfEdge);
var prevTwinEdge = geometry.GetHalfEdgeByHandle(prevEdge.TwinHalfEdge);
nextOriginV.VertData.Pos = nextOriginV.VertData.Pos + extrusionVector * offset;
var h4 = new HalfEdge(geometry.CreateHalfEdgeHandleId());
var h2n = new HalfEdge(geometry.CreateHalfEdgeHandleId());
var h1 = new HalfEdge(geometry.CreateHalfEdgeHandleId());
var currentList = vertexIncHe[nextOriginV.Handle];
foreach (var halfEdge in currentList)
{
if (halfEdge == next)
{
continue;
}
var edge = GeomEditing.UpdateHalfEdgeOrigin(halfEdge, newVertex.Handle);
geometry.ReplaceHalfEdge(edge);
}
nextOriginV.IncidentHalfEdge = next.Handle;
h4.OriginVertex = nextOriginV.Handle;
h2n.OriginVertex = newVertex.Handle;
h1.OriginVertex = newVertex.Handle;
h4.TwinHalfEdge = h2n.Handle;
h2n.TwinHalfEdge = h4.Handle;
h4.NextHalfEdge = h1.Handle;
h1.PrevHalfEdge = h4.Handle;
h1.TwinHalfEdge = next.TwinHalfEdge;
twinEdge.TwinHalfEdge = h1.Handle;
prevTwinEdge.OriginVertex = newVertex.Handle;
newVertex.IncidentHalfEdge = h2n.Handle;
geometry.ReplaceHalfEdge(twinEdge);
geometry.ReplaceHalfEdge(prevTwinEdge);
geometry.ReplaceVertex(nextOriginV);
geometry.DictVertices.Add(newVertex.Handle, newVertex);
geometry.DictHalfEdges.Add(h4.Handle, h4);
geometry.DictHalfEdges.Add(h1.Handle, h1);
geometry.DictHalfEdges.Add(h2n.Handle, h2n);
allH2NEdges.Add(h2n);
next = geometry.GetHalfEdgeByHandle(next.NextHalfEdge);
} while (start != next);
start = geometry.GetHalfEdgeByHandle(face.OuterHalfEdge);
next = start;
do
{
var newFace = new Face(geometry.CreateFaceHandleId());
var twinEdge = geometry.GetHalfEdgeByHandle(next.TwinHalfEdge);
var h1 = geometry.GetHalfEdgeByHandle(twinEdge.TwinHalfEdge);
var h2 = allH2NEdges.First(n => n.OriginVertex == twinEdge.OriginVertex);
var h3 = new HalfEdge(geometry.CreateHalfEdgeHandleId());
var h4 = geometry.GetHalfEdgeByHandle(h1.PrevHalfEdge);
//set Face
h1.IncidentFace = newFace.Handle;
h2.IncidentFace = newFace.Handle;
h3.IncidentFace = newFace.Handle;
h4.IncidentFace = newFace.Handle;
h1.NextHalfEdge = h2.Handle;
h2.NextHalfEdge = h3.Handle;
h3.NextHalfEdge = h4.Handle;
h4.NextHalfEdge = h1.Handle;
h1.PrevHalfEdge = h4.Handle;
h2.PrevHalfEdge = h1.Handle;
h3.PrevHalfEdge = h2.Handle;
h4.PrevHalfEdge = h3.Handle;
h3.TwinHalfEdge = next.Handle;
h3.OriginVertex = geometry.GetHalfEdgeByHandle(next.NextHalfEdge).OriginVertex;
next.TwinHalfEdge = h3.Handle;
newFace.OuterHalfEdge = h1.Handle;
//write all changes
geometry.ReplaceHalfEdge(h1);
geometry.ReplaceHalfEdge(h2);
geometry.ReplaceHalfEdge(h4);
geometry.ReplaceHalfEdge(next);
geometry.DictHalfEdges.Add(h3.Handle, h3);
geometry.DictFaces.Add(newFace.Handle, newFace);
newFace.FaceData.FaceNormal = GeometricOperations.CalculateFaceNormal(geometry.GetFaceVertices(newFace.Handle).ToList());
geometry.ReplaceFace(newFace);
next = geometry.GetHalfEdgeByHandle(next.NextHalfEdge);
} while (start != next);
return(geometry);
}