VTKExport.cpp

/*This file is part of the FEBio Studio source code and is licensed under the MIT license
listed below.

See Copyright-FEBio-Studio.txt for details.

Copyright (c) 2021 University of Utah, The Trustees of Columbia University in
the City of New York, and others.

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.*/

#include "VTKExport.h"
#include <GeomLib/GObject.h>
#include <GeomLib/GModel.h>
#include <FEMLib/FSProject.h>

VTKExport::VTKExport(FSProject& prj) : FSFileExport(prj)
{
	m_ops.bpartIds = true;
	m_ops.bshellthick = false;
	m_ops.bscalardata = false;

	AddBoolParam(m_ops.bpartIds, "parts_as_cells", "Write part numbers as CELL_DATA");
	AddBoolParam(m_ops.bshellthick, "shell_thick", "Write shell thickness");
	AddBoolParam(m_ops.bscalardata, "scalar_data", "Write scalar data");
}

VTKExport::~VTKExport(void)
{
}

bool VTKExport::UpdateData(bool bsave)
{
	if (bsave)
	{
		m_ops.bpartIds    = GetBoolValue(0);
		m_ops.bshellthick = GetBoolValue(1);
		m_ops.bscalardata = GetBoolValue(2);
	}
	else
	{
		SetBoolValue(0, m_ops.bpartIds);
		SetBoolValue(1, m_ops.bshellthick);
		SetBoolValue(2, m_ops.bscalardata);
	}

	return false;
}


bool VTKExport::Write(const char* szfile)
{
	FILE* fp = fopen(szfile, "wt");
	if (fp == 0) return false;

	bool isPOLYDATA = false;
	bool isUnstructuredGrid = false;
	bool isTriShell = false;
	bool isQuadShell = false;
	bool isHex8 = false;
	bool isTet4 = false;
	bool isTet10 = false;

	FSModel* ps = &m_prj.GetFSModel();
	GModel& model = ps->GetModel();

	int totElems = 0;
	int nodesPerElem = 0;

	for (int i=0; i<model.Objects(); ++i)
	{
		FSMesh* pm = model.Object(i)->GetFEMesh();
		if (pm == 0) return false;
		FSMesh& m = *pm;

		//tags all nodes as -1
		m.TagAllNodes(-1);

		totElems += m.Elements();

		// tags all the nodes in elements as 1
		for (int j=0; j<m.Elements(); ++j)
		{
			FSElement &el = m.Element(j);
			for (int k=0; k<el.Nodes(); ++k)
				m.Node(el.m_node[k]).m_ntag = 1;

			//check element type
			if (j==0)
			{
				int elType = el.Type();
				switch(elType)
				{
				case FE_TRI3:
					isPOLYDATA = true;
					isTriShell = true;
					nodesPerElem = 3;
					break;
				case FE_QUAD4:
					isPOLYDATA = true;
					isQuadShell = true;
					nodesPerElem = 4;
					break;
				case FE_HEX8:
					isHex8 = true;
					isUnstructuredGrid = true;
					nodesPerElem = 8;
					break;
				case FE_TET4:
					isTet4 = true;
					isUnstructuredGrid = true;
					nodesPerElem = 4;
					break;
				case FE_TET10:
					isTet10 = true;
					isUnstructuredGrid = true;
					nodesPerElem = 10;
					break;
				default:
					return errf("Only triangular, quadrilateral, tetrahedral, and hexahedron polygons are supported.");
				}
			}
		}
	}

	// tag the node as per the node number
	int nodes = 0;
	for (int i=0; i<model.Objects(); ++i)
	{
		FSMesh& m = *model.Object(i)->GetFEMesh();
		for (int j=0; j<m.Nodes(); ++j)
		{
			if (m.Node(j).m_ntag == 1) 
			{
				m.Node(j).m_ntag = nodes;
				nodes++;
			}
		}
	}

	// --- H E A D E R ---
	fprintf(fp, "%s\n" , "# vtk DataFile Version 3.0");
	fprintf(fp, "%s\n" ,"vtk output");
	fprintf(fp, "%s\n" ,"ASCII");
	if(isPOLYDATA)
		fprintf(fp, "%s\n" ,"DATASET POLYDATA");
	if(isUnstructuredGrid)
		fprintf(fp, "%s\n" ,"DATASET UNSTRUCTURED_GRID");
	fprintf(fp, "%s %d %s\n" ,"POINTS", nodes ,"float");

	//fprintf(fp, "%d %d %d %d\n", parts, nodes, faces, edges);

	// --- N O D E S ---
	std::vector<vec3d> nodeCoords(nodes);
	nodes = 0;
	for (int i = 0; i < model.Objects(); ++i)
	{
		FSMesh& m = *model.Object(i)->GetFEMesh();
		for (int j = 0; j < m.Nodes(); ++j)
		{
			FSNode& node = m.Node(j);
			if (node.m_ntag >= 0)
			{
				vec3d r = m.LocalToGlobal(node.r);
				nodeCoords[nodes] = r;
				nodes++;
			}
		}
	}
	assert(nodes == nodeCoords.size());
	for (int i=0; i<nodes; i+=3)
	{
		for (int k =0; (k<3) && ((i+k)<nodes);k++)
		{
			vec3d r = nodeCoords[i + k];
			fprintf(fp, "%g %g %g ", r.x, r.y, r.z);
		}
		fprintf(fp, "\n");
	}
	fprintf(fp, "%s\n" ,"");

	// --- E L E M E N T S ---


	if (isPOLYDATA)
		fprintf(fp, "%s %d %d\n", "POLYGONS", totElems, totElems * (nodesPerElem + 1));
	if (isUnstructuredGrid)
		fprintf(fp, "%s %d %d\n", "CELLS", totElems, totElems * (nodesPerElem + 1));

	int nn[FSElement::MAX_NODES];
	for (int i=0; i<model.Objects(); ++i)
	{
		FSMesh& m = *model.Object(i)->GetFEMesh();
		for (int j=0; j<m.Elements(); ++j)
		{
			FSElement& el = m.Element(j);
			for (int k=0; k<el.Nodes(); ++k) 
				nn[k] = m.Node(el.m_node[k]).m_ntag;

			switch (el.Type())
			{
			case FE_TRI3:
				fprintf(fp, "%d %d %d %d\n", el.Nodes(), nn[0], nn[1], nn[2]);
				break;
			case FE_QUAD4:
				fprintf(fp, "%d %d %d %d %d\n", el.Nodes(),nn[0], nn[1], nn[2], nn[3]);
				break;
			case FE_TET4:
				fprintf(fp, "%d %d %d %d %d\n", el.Nodes(), nn[0], nn[1], nn[2], nn[3]);
				break;
			case FE_HEX8:
				fprintf(fp, "%d %d %d %d %d %d %d %d %d\n", el.Nodes(),nn[0], nn[1], nn[2], nn[3], nn[4], nn[5], nn[6], nn[7]);
				break;
			case FE_TET10:
				fprintf(fp, "%d %d %d %d %d %d %d %d %d %d %d\n", el.Nodes(), nn[0], nn[1], nn[2], nn[3], nn[4], nn[5], nn[6], nn[7], nn[8], nn[9]);
				break;
			default:
				return false;
			}
		}
	}

	//cell type
	if (isHex8 || isTet4 || isTet10)
	{
		fprintf(fp, "%s\n", "");
		fprintf(fp, "%s %d\n", "CELL_TYPES", totElems);
		for (int i = 0; i < model.Objects(); ++i)
		{
			FSMesh& m = *model.Object(i)->GetFEMesh();
			for (int j = 0; j < m.Elements(); ++j)
			{
				if (isHex8) fprintf(fp, "%s\n", "12");
				if (isTet4) fprintf(fp, "%s\n", "10");
				if (isTet10) fprintf(fp, "%s\n", "24");
			}
		}
	}

	// Write element IDs as cell data
	if (m_ops.bpartIds)
	{
		fprintf(fp, "%s\n", "");
		fprintf(fp, "%s %d\n", "CELL_DATA", totElems);
		fprintf(fp, "%s %s %s\n", "SCALARS", "part_ids", "int");
		fprintf(fp, "%s\n", "LOOKUP_TABLE default");
		int IDoffset = 0;
		for (int i = 0; i < model.Objects(); ++i)
		{
			int maxId = 0;
			FSMesh& m = *model.Object(i)->GetFEMesh();
			for (int j = 0; j < m.Elements(); ++j)
			{
				int gid = m.Element(j).m_gid;
				if (gid > maxId) maxId = gid;
				fprintf(fp, "%d\n", gid + IDoffset);
			}
			IDoffset += maxId + 1;
		}
	}

	//----Shell Thickness ----
	if (m_ops.bshellthick)
	{
		fprintf(fp, "%s\n" ,"");
		fprintf(fp, "%s %d\n" ,"POINT_DATA", nodes);
		fprintf(fp, "%s %s %s\n" ,"SCALARS", "ShellThickness", "float");
		fprintf(fp,"%s\n","LOOKUP_TABLE default");
		for (int i=0; i<model.Objects(); ++i)
		{
			FSMesh& m = *model.Object(i)->GetFEMesh();

			std::vector<double> nodeShellThickness; 
			nodeShellThickness.reserve(nodes);
			int nn[8];
			for (int k = 0 ; k< nodes;k++)
				nodeShellThickness.push_back(0);

			for (int j=0; j<m.Elements(); ++j)
			{
				FSElement& el = m.Element(j);
				if (!el.IsType(FE_TRI3) && !el.IsType(FE_QUAD4))
					break;

				for (int k=0; k<el.Nodes(); ++k) 
						nn[k] = el.m_node[k];

				double* h = el.m_h;
			
				for(int k =0;k<el.Nodes();k++)
					nodeShellThickness[nn[k]] = h[k];

			}

			for (int j=0; j<m.Nodes();)
			{
				for (int k =0; k<9 && j+k<m.Nodes();k++)
					fprintf(fp, "%15.10lg ", nodeShellThickness[j+k]);	
				fprintf(fp, "\n");
				j = j + 9;	
			}
		}
	}

	//-----Nodal Data-----------
	if (m_ops.bscalardata)
	{
/*		fprintf(fp, "%s\n" ,"");
		fprintf(fp, "%s %d\n" ,"POINT_DATA", nodes);
		fprintf(fp, "%s %s %s\n" ,"SCALARS", "ScalarData", "float");
		fprintf(fp,"%s\n","LOOKUP_TABLE default");
		for (i=0; i<model.Objects(); ++i)
		{
			FSMesh& m = *model.Object(i)->GetFEMesh();
			for (j=0; j<m.Nodes();)
			{
				for (int k =0; k<9 && j+k<m.Nodes();k++)
				{
					FSNode& n = m.Node(j+k);
						fprintf(fp, "%15.10lg ", n.m_ndata);
				}
				fprintf(fp, "\n");
				j = j + 9;	
			}
		}
*/
	}

	fclose(fp);

	return true;
}