FEFixMesh.cpp

/*This file is part of the FEBio Studio source code and is licensed under the MIT license
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See Copyright-FEBio-Studio.txt for details.

Copyright (c) 2021 University of Utah, The Trustees of Columbia University in
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#include "stdafx.h"
#include "FEFixMesh.h"
#include "FEFillHole.h"
#include <MeshLib/MeshMetrics.h>
#include <MeshLib/FESurfaceMesh.h>
#include <MeshLib/FENodeFaceList.h>
#include <MeshLib/FEMeshBuilder.h>
using namespace std;

//-----------------------------------------------------------------------------
FEFixMesh::FEFixMesh() : FEModifier("Fix mesh")
{
	AddIntParam(0, "Task:", "Task:")->SetEnumNames("Remove duplicate edges\0Remove isolated vertices\0");
}

//-----------------------------------------------------------------------------
FSMesh* FEFixMesh::Apply(FSMesh* pm)
{
	// create a copy of the mesh
	FSMesh* pnew = new FSMesh(*pm);
	pnew->SetGObject(pm->GetGObject());

	// apply the task on this mesh
	int task = GetIntValue(0);
	bool ret = false;
	switch (task)
	{
	case 0: ret = RemoveDuplicateEdges  (pnew); break;
	case 1: ret = RemoveIsolatedVertices(pnew); break;
	}

	if (ret == false)
	{
		delete pnew;
		pnew = 0;
	}

	return pnew;
}

//-----------------------------------------------------------------------------
bool FEFixMesh::RemoveDuplicateEdges(FSMesh* pm)
{
	int NE = pm->Edges();
	int NN = pm->Nodes();

	vector<vector<int> > NET(NN);
	for (int i = 0; i < pm->Edges(); ++i)
	{
		FSEdge& ei = pm->Edge(i);
		NET[ei.n[0]].push_back(i);
		NET[ei.n[1]].push_back(i);
	}

	int duplicates = 0;
	pm->TagAllEdges(-1);
	for (int i = 0; i < pm->Edges(); ++i)
	{
		FSEdge& ei = pm->Edge(i);
		if (ei.m_ntag == -1)
		{
			vector<int>& net = NET[ei.n[0]];
			for (int j = 0; j < net.size(); ++j)
			{
				int nej = net[j];
				if (nej > i)
				{
					FSEdge& ej = pm->Edge(nej);
					if ((ej.m_ntag == -1) && (ej == ei))
					{
						ej.m_ntag = i;
						duplicates++;
					}
				}
			}
		}
	}
	SetError("%d duplicate edges found.", duplicates);
	if (duplicates == 0) return true;

	// re-index the edges
	vector<int> id(pm->Edges(), -1);
	int ne = 0;
	for (int i = 0; i < pm->Edges(); ++i)
	{
		FSEdge& ei = pm->Edge(i);
		if (ei.m_ntag == -1) id[i] = ne++;
	}

	// update edge neighbors
	for (int i = 0; i < pm->Edges(); ++i)
	{
		FSEdge& ei = pm->Edge(i);
		if (ei.m_ntag == -1)
		{
			if (ei.m_nbr[0] >= 0) ei.m_nbr[0] = id[ei.m_nbr[0]];
			if (ei.m_nbr[1] >= 0) ei.m_nbr[1] = id[ei.m_nbr[1]];
		}
	}

	// the faces could reference edges, so we will need to reindex them 
	for (int i = 0; i < pm->Faces(); ++i)
	{
		FSFace& f = pm->Face(i);
		for (int j = 0; j < 4; ++j)
		{
			int nej = f.m_edge[j];
			if (nej >= 0)
			{
				FSEdge& ej = pm->Edge(nej);
				if (ej.m_ntag >= 0)
				{
					int nid = id[ej.m_ntag]; assert(nid >= 0);
					f.m_edge[j] = nid;
				}
			}
		}
	}

	// delete the duplicate edges
	ne = 0;
	for (int i = 0; i < pm->Edges(); ++i)
	{
		FSEdge& ei = pm->Edge(i);
		if (ei.m_ntag == -1)
		{
			assert(id[i] >= 0);
			if (i != ne)
			{
				FSEdge& en = pm->Edge(ne);
				en = ei;
			}
			ne++;
		}
	}

	// resize edges
	pm->ResizeEdges(ne);

	// TODO: It is possible that duplicate edges messed up
	// the node partitioning. Should I repartition nodes here? 

	//all done
	return true;
}

//-----------------------------------------------------------------------------
bool FEFixMesh::RemoveIsolatedVertices(FSMesh* pm)
{
	FEMeshBuilder mb(*pm);
	int n = mb.RemoveIsolatedNodes();
	SetError("%d vertices removed.", n);
	return true;
}