The training data contain mesh information of 3D body is stored in .obj file. Here is format of the .obj file:
####
#
# OBJ File Generated by Meshlab
#
####
# Object female01-1532-na.obj
#
# Vertices: 1282
# Faces: 2560
#
####
vn -0.344122 0.249172 -0.905258
v -155.144363 -54.513828 -640.656250
vn 0.046374 -0.339345 -0.939518
v -122.898865 -80.428886 -643.766418
...
vn 0.011051 0.127717 0.991749
v -53.384335 4.810349 852.756348
# 1282 vertices, 1282 vertices normals
f 5//5 1//1 16//16
f 29//29 18//18 6//6
...
f 545//545 501//501 503//503
# 2560 faces, 0 coords texture
# End of File
The lines start with '#' in file can be treated as comments as "//" in C/C++.
The lines begin with vn indicate that the three numbers is unit normal at the point. The next line starting with v indicate the corresponding vertex coordinate.
The lines starting with f indicate the face/mesh information. For example, the first triangle consist of vertex 5, 1 and 16.
Following is snippet for reading obj file and save the data as plain text.
// ObjReader.h
#pragma once
#include
#include
#include
#include
#include
#include
class CObjReader
{
public:
typedef struct point3fTag
{
float x, y, z;
float normx, normy, normz;
}point3f;
int m_iNbofVertex;
CObjReader(void);
~CObjReader(void);
static void ReadObj(const std::string& filename, CObjReader &currObj);
};
// ObjReader.cpp
#include "ObjReader.h"
CObjReader::CObjReader(void):m_iNbofVertex(0){}
CObjReader::~CObjReader(void){}
void CObjReader::ReadObj(const std::string& filename, CObjReader &currObj)
{
std::fstream fp;
std::ofstream op(".\\output.txt");
fp.open(filename.c_str(), std::ios::in);
std::stringstream ss;
std::string temp;
float tempFloat = 0.0f;
std::vector vertice;
std::vector face;
// Skip header
do
{
getline(fp, temp);
} while (temp[0] == '#');
// Process vertex and its normal
while (temp[0] != '#')
{
ss << temp;
ss >> temp; // skip "vn"
point3f tempPoint;
ss >> tempPoint.normx >> tempPoint.normy >> tempPoint.normz;
ss.clear();
// get v
getline(fp, temp);
ss << temp;
ss >> temp; // skip 'v'
ss >> tempPoint.x >> tempPoint.y >> tempPoint.z;
ss.clear();
vertice.push_back(tempPoint);
// get vn for next point
getline(fp, temp);
}
ss << temp;
ss >> temp; // skip '#'
unsigned int a;
ss >> a;
ss.clear();
assert(a == vertice.size());
currObj.m_iNbofVertex = vertice.size();
// Process face
getline(fp, temp); // skip empty line
getline(fp, temp); // Get first line of face data
do
{
ss.str(""); // Clean previous contents
ss << temp;
ss >> temp; // skip 'f'
for (int i = 0; i < 3; i++)
{
ss >> temp; // temp: i//i
temp.erase(temp.find('/'),temp.size()-temp.find('/'));
face.push_back(std::stoi(temp));
}
ss.clear();
getline(fp, temp);
} while (temp[0] == 'f');
std::cout << temp << std::endl;
fp.close();
// Save vertice and face info
for (unsigned int i = 0; i < vertice.size(); i++)
{
op << "vn: ";
op << vertice[i].normx << " " << vertice[i].normy << " " << vertice[i].normz << "\n";
op << "v: ";
op << vertice[i].x << " " << vertice[i].y << " " << vertice[i].z << "\n";
}
op << "# Face data\n";
for (int i = 0; i < face.size();)
{
op << face[i] << " " << face[i+1] << " " << face[i+2] << "\n";
i = i + 3;
}
op.close();
}
