public void MergeMeshEdges(MeshEdge edgeToKeep, MeshEdge edgeToDelete, bool doActualDeletion = true)
{
// make sure they sare vertexes (or they can't be merged)
if (!edgeToDelete.IsConnectedTo(edgeToKeep.VertexOnEnd[0]) ||
!edgeToDelete.IsConnectedTo(edgeToKeep.VertexOnEnd[1]))
{
throw new Exception("These mesh edges do not share vertexes and can't be merged.");
}
edgeToDelete.RemoveFromMeshEdgeLinksOfVertex(edgeToKeep.VertexOnEnd[0]);
edgeToDelete.RemoveFromMeshEdgeLinksOfVertex(edgeToKeep.VertexOnEnd[1]);
// fix any face edges that are referencing the edgeToDelete
foreach (FaceEdge attachedFaceEdge in edgeToDelete.firstFaceEdge.RadialNextFaceEdges())
{
attachedFaceEdge.meshEdge = edgeToKeep;
}
List <FaceEdge> radialLoopToMove = new List <FaceEdge>();
foreach (FaceEdge faceEdge in edgeToDelete.firstFaceEdge.RadialNextFaceEdges())
{
radialLoopToMove.Add(faceEdge);
}
foreach (FaceEdge faceEdge in radialLoopToMove)
{
faceEdge.AddToRadialLoop(edgeToKeep);
}
if (doActualDeletion)
{
MeshEdges.Remove(edgeToDelete);
}
}
public void UnsplitFace(Face faceToKeep, Face faceToDelete, MeshEdge meshEdgeToDelete)
{
if (faceToKeep == faceToDelete)
{
throw new Exception("Can't join face to itself");
}
// validate the edgeToDelete is in both faces, edgeToDelete is only in these two faces, the two faces only share this one edge and no other edges
FaceEdge faceEdgeToDeleteOnFaceToKeep = meshEdgeToDelete.GetFaceEdge(faceToKeep);
FaceEdge faceEdgeToDeleteOnFaceToDelete = meshEdgeToDelete.GetFaceEdge(faceToDelete);
if (faceEdgeToDeleteOnFaceToKeep.firstVertex == faceEdgeToDeleteOnFaceToDelete.firstVertex)
{
throw new Exception("The faces have oposite windings and you cannot merge the edge");
}
faceEdgeToDeleteOnFaceToKeep.prevFaceEdge.nextFaceEdge = faceEdgeToDeleteOnFaceToDelete.nextFaceEdge;
faceEdgeToDeleteOnFaceToDelete.nextFaceEdge.prevFaceEdge = faceEdgeToDeleteOnFaceToKeep.prevFaceEdge;
faceEdgeToDeleteOnFaceToKeep.nextFaceEdge.prevFaceEdge = faceEdgeToDeleteOnFaceToDelete.prevFaceEdge;
faceEdgeToDeleteOnFaceToDelete.prevFaceEdge.nextFaceEdge = faceEdgeToDeleteOnFaceToKeep.nextFaceEdge;
// if the face we are deleting is the one that the face to keep was looking at as its starting face edge, move it to the next face edge
if (faceToKeep.firstFaceEdge == faceEdgeToDeleteOnFaceToKeep)
{
faceToKeep.firstFaceEdge = faceToKeep.firstFaceEdge.nextFaceEdge;
}
// make sure the FaceEdges all point to the kept face.
foreach (FaceEdge faceEdge in faceToKeep.firstFaceEdge.NextFaceEdges())
{
faceEdge.containingFace = faceToKeep;
}
// make sure we take the mesh edge out of the neighbors pointers
meshEdgeToDelete.RemoveFromMeshEdgeLinksOfVertex(meshEdgeToDelete.VertexOnEnd[0]);
meshEdgeToDelete.RemoveFromMeshEdgeLinksOfVertex(meshEdgeToDelete.VertexOnEnd[1]);
// clear the data on the deleted face edge to help with debugging
faceEdgeToDeleteOnFaceToKeep.meshEdge.VertexOnEnd[0] = null;
faceEdgeToDeleteOnFaceToKeep.meshEdge.VertexOnEnd[1] = null;
faceToDelete.firstFaceEdge = null;
// take the face out of the face list
faces.Remove(faceToDelete);
// clear the data on the deleted mesh edge to help with debugging
meshEdgeToDelete.firstFaceEdge = null;
meshEdgeToDelete.VertexOnEnd[0] = null;
meshEdgeToDelete.NextMeshEdgeFromEnd[0] = null;
meshEdgeToDelete.VertexOnEnd[1] = null;
meshEdgeToDelete.NextMeshEdgeFromEnd[1] = null;
MeshEdges.Remove(meshEdgeToDelete);
}