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io_pc.h
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#ifndef IO_H
#define IO_H
///--- hacked from OpenGP obj reader
#include <cstdio>
#include <Eigen/Dense>
#include <vector>
#include <string>
#include <iostream>
#include <fstream>
template <class MatrixType>
bool read_obj(MatrixType& vertices, MatrixType& normals, MatrixType& vert_colors, const std::string& filename, int D) {
char s[200];
float x, y, z, cx, cy, cz;
// open file (in ASCII mode)
FILE* in = fopen(filename.c_str(), "r");
if (!in) return false;
// clear line once
memset(&s, 0, 200);
//--- First pass, counts vertices
int n_vertices = 0;
int n_normals = 0;
while (in && !feof(in) && fgets(s, 200, in)) {
// comment
if (s[0] == '#' || isspace(s[0])) continue;
// vertex
else if (strncmp(s, "v ", 2) == 0)
n_vertices++;
else if (strncmp(s, "vn ", 2) == 0)
n_normals++;
}
fseek(in, 0, 0); ///< rewind
vertices.resize(D, n_vertices);
if(n_normals > 0)
normals.resize(D, n_vertices);
bool runonce = true;
//--- Second pass, fills in
int curr_vertex=0;
while (in && !feof(in) && fgets(s, 200, in)) {
// comment
if (s[0] == '#' || isspace(s[0])) continue;
// normal
else if (strncmp(s, "vn ", 3) == 0) {
if (sscanf(s, "vn %f %f %f", &x, &y, &z)) {
if (runonce)
{
normals.resize(D, n_vertices);
runonce = false;
}
normals(0, curr_vertex) = x;
normals(1, curr_vertex) = y;
normals(2, curr_vertex) = z;
}
}
// vertex
else if (strncmp(s, "v ", 2) == 0) {
if (sscanf(s, "v %f %f %f %f %f %f", &x, &y, &z, &cx, &cy, &cz)) {
vertices(0,curr_vertex) = x;
vertices(1,curr_vertex) = y;
vertices(2,curr_vertex) = z;
if(vert_colors.size()==0)
vert_colors.resize(D, n_vertices);
vert_colors(0, curr_vertex) = cx;
vert_colors(1, curr_vertex) = cy;
vert_colors(2, curr_vertex) = cz;
curr_vertex++;
}
else if (sscanf(s, "v %f %f %f", &x, &y, &z)) {
vertices(0,curr_vertex) = x;
vertices(1,curr_vertex) = y;
vertices(2,curr_vertex) = z;
curr_vertex++;
}
}
// face
else if (strncmp(s, "f ", 2) == 0) {
continue;
}
// clear line
memset(&s, 0, 200);
}
fclose(in);
return true;
}
//-----------------------------------------------------------------------------
///--- Replaces vertices in prev_filename with content of vertices, saves in filename
template <class MatrixType>
bool write_obj_replaceverts(const std::string& prev_filename, const MatrixType& vertices, const MatrixType& normals,
const MatrixType& vert_colors, const std::string& filename) {
typedef Eigen::Vector3d Texture_coordinate;
char s[200];
FILE* out = fopen(filename.c_str(), "w");
FILE* in = fopen(prev_filename.c_str(), "r");
if (!in || !out)
return false;
// clear line once
memset(&s, 0, 200);
//--- Second pass, fills in
int curr_vertex=0;
while (in && !feof(in) && fgets(s, 200, in)) {
// vertex
if (!isspace(s[0]) && strncmp(s, "v ", 2) == 0) {
fprintf(out, "vn %f %f %f\n", normals(0,curr_vertex), normals(1,curr_vertex), normals(2,curr_vertex));
fprintf(out, "v %f %f %f ", vertices(0,curr_vertex), vertices(1,curr_vertex), vertices(2,curr_vertex));
if(vert_colors.size())
fprintf(out, "%f %f %f\n", vert_colors(0,curr_vertex), vert_colors(1, curr_vertex), vert_colors(2, curr_vertex));
else
fprintf(out, "\n");
curr_vertex++;
} else {
fprintf(out, "%s", s);
}
// clear line
memset(&s, 0, 200);
}
fclose(in);
fclose(out);
return true;
}
template <class MatrixType>
bool read_transMat(MatrixType& trans, const std::string& filename)
{
std::ifstream input(filename);
std::string line;
int rows, cols;
std::vector<std::vector<double>> total_data;
while (getline(input, line)) {
if(line[0] == 'V' || line[0] == 'M')
continue;
std::istringstream iss(line);
std::vector<double> lineVec;
while (iss) {
double item;
if (iss >> item)
lineVec.push_back(item);
}
cols = lineVec.size();
total_data.push_back(lineVec);
}
if (total_data.size() == 0)
{
std::cout << filename << " is empty !! " << std::endl;
return false;
}
rows = total_data.size();
trans.resize(rows, cols);
std::cout << "rows = " << rows << " cols = " << cols << std::endl;
for (int i = 0; i < rows; i++)
{
for (int j = 0; j < cols; j++)
{
trans(i, j) = total_data[i][j];
}
}
input.close();
std::cout << "read trans = \n" << trans << std::endl;
return true;
}
template <class MatrixType>
bool read_ply(MatrixType& vertices, MatrixType& normals, MatrixType& colors, const std::string& filename, int D) {
char s[200];
float x, y, z, nx, ny, nz;
int r, g, b;
int dim = 0;
int n_vertices, curr_vertex;
Eigen::Vector3i ID;
ID.setZero();
// open file (in ASCII mode)
FILE* in = fopen(filename.c_str(), "r");
if (!in) return false;
// clear line once
memset(&s, 0, 200);
//--- First pass, counts vertices
while (in && !feof(in) && fgets(s, 200, in)) {
// comment
if (strncmp(s, "element ", 8) == 0)
{
sscanf(s, "element vertex %d", &n_vertices);
}
if (strncmp(s, "property float x", 16) == 0)
{
if(strncmp(s, "property float x_", 17)==0)
{
continue;
}
vertices.resize(D,n_vertices);
ID[0]=1;
dim += 3;
}
if(strncmp(s, "property float nx", 17) == 0)
{
normals.resize(D,n_vertices);
ID[1]=1;
dim += 3;
}
if(strncmp(s, "property uchar red", 18) == 0)
{
colors.resize(3,n_vertices);
ID[2]=1;
dim += 3;
}
if(strncmp(s, "end_header", 10) == 0)
{
break;
}
memset(&s, 0, 200);
}
// clear line
memset(&s, 0, 200);
curr_vertex = 0;
while (in && !feof(in) && fgets(s, 200, in) && curr_vertex<n_vertices)
{
if(dim == 3)
{
if(sscanf(s, "%f %f %f",&x, &y, &z))
{
vertices(0,curr_vertex) = x;
vertices(1,curr_vertex) = y;
vertices(2,curr_vertex) = z;
curr_vertex++;
}
}
else if(dim==6)
{
if(ID[1])
{
if(sscanf(s, "%f %f %f %f %f %f",&x, &y, &z, &nx, &ny, &nz))
{
vertices(0,curr_vertex) = x;
vertices(1,curr_vertex) = y;
vertices(2,curr_vertex) = z;
normals(0, curr_vertex) = nx;
normals(1, curr_vertex) = ny;
normals(2, curr_vertex) = nz;
curr_vertex++;
}
}
else
{
if(sscanf(s, "%f %f %f %d %d %d",&x, &y, &z, &r, &g, &b))
{
vertices(0,curr_vertex) = x;
vertices(1,curr_vertex) = y;
vertices(2,curr_vertex) = z;
colors(0, curr_vertex) = r;
colors(1, curr_vertex) = g;
colors(2, curr_vertex) = b;
curr_vertex++;
}
}
}
else if(dim == 9)
{
if(sscanf(s, "%f %f %f %f %f %f %d %d %d", &x, &y, &z, &nx, &ny, &nz, &r, &g, &b))
{
vertices(0,curr_vertex) = x;
vertices(1,curr_vertex) = y;
vertices(2,curr_vertex) = z;
normals(0, curr_vertex) = nx;
normals(1, curr_vertex) = ny;
normals(2, curr_vertex) = nz;
colors(0, curr_vertex) = r;
colors(1, curr_vertex) = g;
colors(2, curr_vertex) = b;
curr_vertex ++;
}
}
if(curr_vertex > n_vertices)
{
n_vertices = curr_vertex;
vertices.resize(Eigen::NoChange, n_vertices);
if(normals.size())
{
normals.resize(Eigen::NoChange, n_vertices);
}
break;
}
// clear line
memset(&s, 0, 200);
}
fclose(in);
return true;
}
template <class MatrixType>
bool write_ply(MatrixType& vertices, MatrixType& normals, MatrixType& colors, const std::string& filename) {
char s[200];
int n_vertices, curr_vertex;
n_vertices = vertices.cols();
Eigen::Vector3d ID; // whether there are normal or color
ID.setZero();
if (vertices.cols())
{
ID[0] = 1;
}
else
{
std::cout << "Warning : No points!!!" << std::endl;
return false;
}
if (normals.cols())
{
ID[1] = 1;
// std::cout << "output file has normals !" << std::endl;
}
if (colors.cols())
{
ID[2] = 1;
// std::cout << "output file has colors !" << std::endl;
}
FILE* out = fopen(filename.c_str(), "w");
if (!out)
return false;
// clear line once
memset(&s, 0, 200);
fprintf(out, "ply\nformat ascii 1.0\nelement vertex %d\n", n_vertices);
fprintf(out, "property float x \nproperty float y\nproperty float z\n");
if(ID[1]) fprintf(out, "property float nx \nproperty float ny\nproperty float nz\n");
if(ID[2]) fprintf(out, "property uchar red\nproperty uchar green\nproperty uchar blue\n");
fprintf(out, "end_header\n");
// clear line
memset(&s, 0, 200);
curr_vertex = 0;
while (curr_vertex<n_vertices)
{
fprintf(out, "%f %f %f ", vertices(0, curr_vertex), vertices(1, curr_vertex), vertices(2, curr_vertex));
if (ID[1]) fprintf(out, "%f %f %f ", normals(0, curr_vertex), normals(1, curr_vertex), normals(2, curr_vertex));
if (ID[2]) fprintf(out, "%d %d %d ", (int)colors(0, curr_vertex), (int)colors(1, curr_vertex), (int)colors(2, curr_vertex));
fprintf(out, "\n");
// clear line
memset(&s, 0, 200);
curr_vertex++;
}
fclose(out);
return true;
}
template <class MatrixType>
bool read_file(MatrixType& vertices, MatrixType& normals, MatrixType& vert_colors,
const std::string& filename) {
if(strcmp(filename.substr(filename.size()-4,4).c_str(), ".obj") == 0)
{
return read_obj(vertices, normals, vert_colors, filename, 3);
}
else if(strcmp(filename.substr(filename.size()-4, 4).c_str(),".ply")==0)
{
return read_ply(vertices, normals, vert_colors, filename, 3);
}
else
{
std::cout << "Can't read file " << filename << std::endl;
}
}
template <class MatrixType>
bool write_file(const std::string& prev_filename, const MatrixType& vertices, const MatrixType& normals,
const MatrixType& vert_colors, const std::string& filename) {
if(strcmp(filename.substr(filename.size()-4,4).c_str(),".obj")==0)
{
return write_obj_replaceverts(prev_filename, vertices, normals, vert_colors, filename);
}
else if(strcmp(filename.substr(filename.size()-4,4).c_str(),".ply")==0)
{
return write_ply(vertices, normals, vert_colors, filename);
}
else
{
std::cout << "Can't write to file "<< filename << std::endl;
}
}
#endif // IO_H