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// Copyright (c) 2015 Qingnan Zhou <qzhou@adobe.com>
// Copyright (C) 2020 Vladimir Fonov <vladimir.fonov@gmail.com>
//
// This Source Code Form is subject to the terms of the Mozilla
// Public License v. 2.0. If a copy of the MPL was not distributed
// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
#include "MshSaver.h"
#include <cassert>
#include <iostream>
#include <sstream>
#include <exception>
IGL_INLINE igl::MshSaver::MshSaver(const std::string& filename, bool binary) :
m_binary(binary), m_num_nodes(0), m_num_elements(0) {
if (!m_binary) {
fout.open(filename.c_str(), std::fstream::out);
} else {
fout.open(filename.c_str(), std::fstream::binary);
}
if (!fout) {
std::stringstream err_msg;
err_msg << "Error opening " << filename << " to write msh file." << std::endl;
throw std::ios_base::failure(err_msg.str());
}
}
IGL_INLINE igl::MshSaver::~MshSaver() {
fout.close();
}
IGL_INLINE void igl::MshSaver::save_mesh(
const FloatVector& nodes,
const IndexVector& elements,
const IntVector& element_lengths,
const IntVector& element_types,
const IntVector& element_tags
) {
save_header();
save_nodes(nodes);
save_elements(elements, element_lengths, element_types, element_tags );
}
IGL_INLINE void igl::MshSaver::save_header() {
if (!m_binary) {
fout << "$MeshFormat" << std::endl;
fout << "2.2 0 " << sizeof(double) << std::endl;
fout << "$EndMeshFormat" << std::endl;
fout.precision(17);
} else {
fout << "$MeshFormat" << std::endl;
fout << "2.2 1 " << sizeof(double) << std::endl;
int one = 1;
fout.write((char*)&one, sizeof(int));
fout << "\n$EndMeshFormat" << std::endl;
}
fout.flush();
}
IGL_INLINE void igl::MshSaver::save_nodes(const FloatVector& nodes) {
// Save nodes.
// 3D hadrcoded
m_num_nodes = nodes.size() / 3;
fout << "$Nodes" << std::endl;
fout << m_num_nodes << std::endl;
if (!m_binary) {
for (size_t i=0; i<nodes.size(); i+=3) {
//const VectorF& v = nodes.segment(i,m_dim);
int node_idx = i/3 + 1;
fout << node_idx << " " << nodes[i] << " " << nodes[i+1] << " " << nodes[i+2] << std::endl;
}
} else {
for (size_t i=0; i<nodes.size(); i+=3) {
//const VectorF& v = nodes.segment(i,m_dim);
int node_idx = i/3 + 1;
fout.write((const char*)&node_idx, sizeof(int));
fout.write((const char*)&nodes[i], sizeof(Float)*3);
}
}
fout << "$EndNodes" << std::endl;
fout.flush();
}
IGL_INLINE void igl::MshSaver::save_elements(const IndexVector& elements,
const IntVector& element_lengths,
const IntVector& element_types,
const IntVector& element_tags)
{
m_num_elements = element_tags.size();
assert(element_lengths.size() == element_types.size() );
assert(element_lengths.size() == element_tags.size() );
// TODO: sum up all lengths
// Save elements.
// node inxes are 1-based
fout << "$Elements" << std::endl;
fout << m_num_elements << std::endl;
if (m_num_elements > 0) {
//int elem_type = el_type;
int num_elems = m_num_elements;
//int tags = 0;
if (!m_binary) {
size_t el_ptr=0;
for (size_t i=0;i<m_num_elements;++i) {
int elem_num = (int) i + 1;
///VectorI elem = elements.segment(i, nodes_per_element) + VectorI::Ones(nodes_per_element);
// hardcoded: duplicate tags (I don't know why)
fout << elem_num << " " << element_types[i] << " " << 2 << " "<< element_tags[i] << " "<< element_tags[i] << " ";
for (size_t j=0; j<element_lengths[i]; j++) {
fout << elements[el_ptr + j] + 1 << " ";
}
fout << std::endl;
el_ptr+=element_lengths[i];
}
} else {
size_t el_ptr=0,i=0;
while(i<m_num_elements) {
// write elements in consistent chunks
// TODO: refactor this code to be able to specify different elements
// more effeciently
int elem_type=-1;
int elem_len=-1;
size_t j=i;
for(;j<m_num_elements;++j)
{
if( elem_type==-1 )
{
elem_type=element_types[j];
elem_len=element_lengths[j];
} else if( elem_type!=element_types[j] ||
elem_len!=element_lengths[j]) {
break; // found the edge of the segment
}
}
//hardcoded: 2 tags
int num_elems=j-i, num_tags=2;
fout.write((const char*)& elem_type, sizeof(int));
fout.write((const char*)& num_elems, sizeof(int));
fout.write((const char*)& num_tags, sizeof(int));
for(int k=0;k<num_elems; ++k,++i){
int elem_num = (int )i + 1;
fout.write((const char*)&elem_num, sizeof(int));
// HACK: hardcoded 2 tags
fout.write((const char*)& element_tags[i], sizeof(int));
fout.write((const char*)& element_tags[i], sizeof(int));
for (size_t e=0; e<elem_len; e++) {
int _elem = static_cast<int>( elements[el_ptr + e] )+1;
fout.write((const char*)&_elem, sizeof(int));
}
el_ptr+=elem_len;
}
}
}
}
fout << "$EndElements" << std::endl;
fout.flush();
}
IGL_INLINE void igl::MshSaver::save_scalar_field(const std::string& fieldname, const FloatVector& field) {
assert(field.size() == m_num_nodes);
fout << "$NodeData" << std::endl;
fout << "1" << std::endl; // num string tags.
fout << "\"" << fieldname << "\"" << std::endl;
fout << "1" << std::endl; // num real tags.
fout << "0.0" << std::endl; // time value.
fout << "3" << std::endl; // num int tags.
fout << "0" << std::endl; // the time step
fout << "1" << std::endl; // 1-component scalar field.
fout << m_num_nodes << std::endl; // number of nodes
if (m_binary) {
for (size_t i=0; i<m_num_nodes; i++) {
int node_idx = i+1;
fout.write((char*)&node_idx, sizeof(int));
fout.write((char*)&field[i], sizeof(Float));
}
} else {
for (size_t i=0; i<m_num_nodes; i++) {
int node_idx = i+1;
fout << node_idx << " " << field[i] << std::endl;
}
}
fout << "$EndNodeData" << std::endl;
fout.flush();
}
IGL_INLINE void igl::MshSaver::save_vector_field(const std::string& fieldname, const FloatVector& field) {
assert(field.size() == 3 * m_num_nodes);
fout << "$NodeData" << std::endl;
fout << "1" << std::endl; // num string tags.
fout << "\"" << fieldname << "\"" << std::endl;
fout << "1" << std::endl; // num real tags.
fout << "0.0" << std::endl; // time value.
fout << "3" << std::endl; // num int tags.
fout << "0" << std::endl; // the time step
fout << "3" << std::endl; // 3-component vector field.
fout << m_num_nodes << std::endl; // number of nodes
const Float zero = 0.0;
if (m_binary) {
for (size_t i=0; i<m_num_nodes; i++) {
int node_idx = i+1;
fout.write((const char*)&node_idx, sizeof(int));
fout.write((const char*)&field[i*3], sizeof(Float)*3);
}
} else {
for (size_t i=0; i<m_num_nodes; i++) {
int node_idx = i+1;
fout << node_idx
<< " " << field[i*3]
<< " " << field[i*3+1]
<< " " << field[i*3+2]
<< std::endl;
}
}
fout << "$EndNodeData" << std::endl;
fout.flush();
}
IGL_INLINE void igl::MshSaver::save_elem_scalar_field(const std::string& fieldname, const FloatVector& field) {
assert(field.size() == m_num_elements);
fout << "$ElementData" << std::endl;
fout << 1 << std::endl; // num string tags.
fout << "\"" << fieldname << "\"" << std::endl;
fout << "1" << std::endl; // num real tags.
fout << "0.0" << std::endl; // time value.
fout << "3" << std::endl; // num int tags.
fout << "0" << std::endl; // the time step
fout << "1" << std::endl; // 1-component scalar field.
fout << m_num_elements << std::endl; // number of elements
if (m_binary) {
for (size_t i=0; i<m_num_elements; i++) {
int elem_idx = i+1;
fout.write((const char*)&elem_idx, sizeof(int));
fout.write((const char*)&field[i], sizeof(Float));
}
} else {
for (size_t i=0; i<m_num_elements; i++) {
int elem_idx = i+1;
fout << elem_idx << " " << field[i] << std::endl;
}
}
fout << "$EndElementData" << std::endl;
fout.flush();
}
IGL_INLINE void igl::MshSaver::save_elem_vector_field(const std::string& fieldname, const FloatVector& field) {
assert(field.size() == m_num_elements * 3);
fout << "$ElementData" << std::endl;
fout << 1 << std::endl; // num string tags.
fout << "\"" << fieldname << "\"" << std::endl;
fout << "1" << std::endl; // num real tags.
fout << "0.0" << std::endl; // time value.
fout << "3" << std::endl; // num int tags.
fout << "0" << std::endl; // the time step
fout << "3" << std::endl; // 3-component vector field.
fout << m_num_elements << std::endl; // number of elements
const Float zero = 0.0;
if (m_binary) {
for (size_t i=0; i<m_num_elements; ++i) {
int elem_idx = i+1;
fout.write((const char*)&elem_idx, sizeof(int));
fout.write((const char*)&field[i*3], sizeof(Float) * 3);
}
} else {
for (size_t i=0; i<m_num_elements; ++i) {
int elem_idx = i+1;
fout << elem_idx
<< " " << field[i*3]
<< " " << field[i*3+1]
<< " " << field[i*3+2]
<< std::endl;
}
}
fout << "$EndElementData" << std::endl;
fout.flush();
}
IGL_INLINE void igl::MshSaver::save_elem_tensor_field(const std::string& fieldname, const FloatVector& field) {
assert(field.size() == m_num_elements * 3 * (3 + 1) / 2);
fout << "$ElementData" << std::endl;
fout << 1 << std::endl; // num string tags.
fout << "\"" << fieldname << "\"" << std::endl;
fout << "1" << std::endl; // num real tags.
fout << "0.0" << std::endl; // time value.
fout << "3" << std::endl; // num int tags.
fout << "0" << std::endl; // the time step
fout << "9" << std::endl; // 9-component tensor field.
fout << m_num_elements << std::endl; // number of elements
const Float zero = 0.0;
if (m_binary) {
for (size_t i=0; i<m_num_elements; i++) {
int elem_idx = i+1;
fout.write((char*)&elem_idx, sizeof(int));
//const VectorF& val = field.segment(i*6, 6);
const Float* val = &field[i*6];
Float tensor[9] = {
val[0], val[5], val[4],
val[5], val[1], val[3],
val[4], val[3], val[2] };
fout.write((char*)tensor, sizeof(Float) * 9);
}
} else {
for (size_t i=0; i<m_num_elements; i++) {
int elem_idx = i+1;
const Float* val = &field[i*6];
fout << elem_idx
<< " " << val[0]
<< " " << val[5]
<< " " << val[4]
<< " " << val[5]
<< " " << val[1]
<< " " << val[3]
<< " " << val[4]
<< " " << val[3]
<< " " << val[2]
<< std::endl;
}
}
fout << "$EndElementData" << std::endl;
fout.flush();
}
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