我正在与一个小组合作开发一个捕获人类2D图像并将其转换为3D模型的应用程序。我们已经使用stasm库来执行ASM http://www.milbo.org/stasm-files/stasm4.pdf，我们正在制定一个有限的时间计划，我们需要在11月底之前完成这个项目，因此了解我们想要通过OpenGL做什么并不是我们最好的想法，因为它有一个非常先进的学习曲线
我们要做的是根据来自stasm的数据来参数化面部的特征，所以我们将这个模型分类为我的鼻子作为搅拌器上的一个对象，所以obj文件我们在关键点上面添加了注释在鼻子里
然后我们开发了一个解析器int str2num(string s){
if (s.length() > 2){
string str= s.substr((s.length()-2), s.find(' '));
int value = (int)atof(str.c_str());
return value;
}
else
return 0;
}
void rokko::objToTxt(const string aInFilename,const string aOutFilename,bool aVerbose)
{
if(aVerbose) cout << "Loading OBJ file <"
<< aInFilename << ">" << endl;
// Open file
ifstream objFile(aInFilename.c_str());
if(objFile.fail())
{
cout << "Error: could not open file <"
<< aInFilename << ">" << endl;
exit(1);
}
// Extract verts, normals, textures, and faces
vector<int> verts, norms, textures;
vector<int> faces;
// map<int,int> faceHash;
vector<int> finalVerts, finalNorms, finalTextures;
vector<int> finalFaces;
string line;
int line_size=0;
int hashIndex = 0;
if(aVerbose) cout << "Extracting values from file" << endl;
// Visit each line of the obj file
while(getline(objFile, line))
{
// Extract vertex
// Line starts with v[space]...
if(line[0] == 'v' && line[1] == ' ')
{
string lineVals = line.substr(2);
float val;
string val0 = lineVals.substr(0, lineVals.find(' '));
val = (float)atof(val0.c_str());
verts.push_back(val);
line_size = val0.size();
string val1 = lineVals.substr(val0.length() + 1,
lineVals.find(' '));
val = (float)atof(val1.c_str());
verts.push_back(val);
string val2 = lineVals.substr(lineVals.find_last_of(' ') + 1);
val = (float)atof(val2.c_str());
verts.push_back(val);
}
// Extract textures
// Line starts with vt[space]...
else if(line[0] == 'v' && line[1] == 't' && line[2] == ' ')
{
string lineVals = line.substr(3);
float val;
string val0 = lineVals.substr(0, lineVals.find(' '));
val = (float)atof(val0.c_str());
textures.push_back(val);
string val1 = lineVals.substr(val0.length() + 1,
lineVals.find(' '));
val = (float)atof(val1.c_str());
textures.push_back(val);
}
// Extract normals
// Line starts with vn[space]...
else if(line[0] == 'v' && line[1] == 'n' && line[2] == ' ')
{
string lineVals = line.substr(3);
float val;
string val0 = lineVals.substr(0, lineVals.find(' '));
val = (float)atof(val0.c_str());
norms.push_back(val);
string val1 = lineVals.substr(val0.length() + 1,
lineVals.find(' '));
val = (float)atof(val1.c_str());
norms.push_back(val);
string val2 = lineVals.substr(lineVals.find_last_of(' ') + 1);
val = (float)atof(val2.c_str());
norms.push_back(val);
}
}
for (int i=0; i<verts.size();i++){
cout << "verts " << i << ": " << verts[i] << endl;}
for (int i=0; i<verts.size();i++)
{
verts[i] = i * 2;
cout << "verts_new " << i << ": " << verts[i] << endl;}
// Parametrizing the nose part
ifstream model ("test.obj");
ofstream out ("out.obj");
int test = 1;
string str;
string line1, line2,line3;
int replace_size = (line_size *3) + 2;
string lineV;
float val_x, val_y, val_z;
string val0, val1, val2;
while(!model.eof())
{
getline(model,line1);
out<<line1<<endl;
while(line1 =="o N")
{
getline(model,line2);
if (line2 =="o H"){
line1 = "o H";
out<<line2<<endl;
}
else
{
string compare = line2.substr(0, line2.find(' '));
switch(str2num(compare)){
case 48: // "#nose_48
getline(model,line3);
lineV = line3.substr(2);
val0 = lineV.substr(0, lineV.find(' '));
val_x = (float)atof(val0.c_str());
line_size = val0.size();
val1 = lineV.substr(val0.length() + 1,lineV.find(' '));
val_y= (float)atof(val1.c_str());
val2 = lineV.substr(lineV.find_last_of(' ') + 1);
val_z= (float)atof(val2.c_str());
out<<"v "<<val_x+0.1<<" "<<val_y<<" "<<val_z<<endl;
break;
case 49: // "#nose_49
getline(model,line3);
lineV = line3.substr(2);
val0 = lineV.substr(0, lineV.find(' '));
val_x = (float)atof(val0.c_str());
line_size = val0.size();
val1 = lineV.substr(val0.length() + 1,lineV.find(' '));
val_y= (float)atof(val1.c_str());
val2 = lineV.substr(lineV.find_last_of(' ') + 1);
val_z= (float)atof(val2.c_str());
out<<"v "<<val_x<<" "<<val_y<<" "<<val_z<<endl;
break;
case 50: // "#nose_50
getline(model,line3);
lineV = line3.substr(2);
val0 = lineV.substr(0, lineV.find(' '));
val_x = (float)atof(val0.c_str());
line_size = val0.size();
val1 = lineV.substr(val0.length() + 1,lineV.find(' '));
val_y= (float)atof(val1.c_str());
val2 = lineV.substr(lineV.find_last_of(' ') + 1);
val_z= (float)atof(val2.c_str());
out<<"v "<<val_x-0.1<<" "<<val_y<<" "<<val_z<<endl;
break;
case 51: // "#nose_51
getline(model,line3);
lineV = line3.substr(2);
val0 = lineV.substr(0, lineV.find(' '));
val_x = (float)atof(val0.c_str());
line_size = val0.size();
val1 = lineV.substr(val0.length() + 1,lineV.find(' '));
val_y= (float)atof(val1.c_str());
val2 = lineV.substr(lineV.find_last_of(' ') + 1);
val_z= (float)atof(val2.c_str());
out<<"v "<<val_x<<" "<<val_y-0.1<<" "<<val_z<<endl;
break;
case 52: // "#nose_52
getline(model,line3);
lineV = line3.substr(2);
val0 = lineV.substr(0, lineV.find(' '));
val_x = (float)atof(val0.c_str());
line_size = val0.size();
val1 = lineV.substr(val0.length() + 1,lineV.find(' '));
val_y= (float)atof(val1.c_str());
val2 = lineV.substr(lineV.find_last_of(' ') + 1);
val_z= (float)atof(val2.c_str());
out<<"v "<<val_x<<" "<<val_y<<" "<<val_z<<endl;
break;
case 53: // "#nose_53
getline(model,line3);
lineV = line3.substr(2);
val0 = lineV.substr(0, lineV.find(' '));
val_x = (float)atof(val0.c_str());
line_size = val0.size();
val1 = lineV.substr(val0.length() + 1,lineV.find(' '));
val_y= (float)atof(val1.c_str());
val2 = lineV.substr(lineV.find_last_of(' ') + 1);
val_z= (float)atof(val2.c_str());
out<<"v "<<val_x<<" "<<val_y-0.1<<" "<<val_z<<endl;
break;
case 54: // "#nose_54
getline(model,line3);
lineV = line3.substr(2);
val0 = lineV.substr(0, lineV.find(' '));
val_x = (float)atof(val0.c_str());
line_size = val0.size();
val1 = lineV.substr(val0.length() + 1,lineV.find(' '));
val_y= (float)atof(val1.c_str());
val2 = lineV.substr(lineV.find_last_of(' ') + 1);
val_z= (float)atof(val2.c_str());
out<<"v "<<val_x+0.1<<" "<<val_y<<" "<<val_z<<endl;
break;
case 55: // "#nose_55
getline(model,line3);
lineV = line3.substr(2);
val0 = lineV.substr(0, lineV.find(' '));
val_x = (float)atof(val0.c_str());
line_size = val0.size();
val1 = lineV.substr(val0.length() + 1,lineV.find(' '));
val_y= (float)atof(val1.c_str());
val2 = lineV.substr(lineV.find_last_of(' ') + 1);
val_z= (float)atof(val2.c_str());
out<<"v "<<val_x+0.1<<" "<<val_y<<" "<<val_z<<endl;
break;
case 56: // "#nose_56
getline(model,line3);
lineV = line3.substr(2);
val0 = lineV.substr(0, lineV.find(' '));
val_x = (float)atof(val0.c_str());
line_size = val0.size();
val1 = lineV.substr(val0.length() + 1,lineV.find(' '));
val_y= (float)atof(val1.c_str());
val2 = lineV.substr(lineV.find_last_of(' ') + 1);
val_z= (float)atof(val2.c_str());
out<<"v "<<val_x<<" "<<val_y-0.2<<" "<<val_z<<endl;
break;
case 57: // "#nose_57
getline(model,line3);
lineV = line3.substr(2);
val0 = lineV.substr(0, lineV.find(' '));
val_x = (float)atof(val0.c_str());
line_size = val0.size();
val1 = lineV.substr(val0.length() + 1,lineV.find(' '));
val_y= (float)atof(val1.c_str());
val2 = lineV.substr(lineV.find_last_of(' ') + 1);
val_z= (float)atof(val2.c_str());
out<<"v "<<val_x-0.1<<" "<<val_y<<" "<<val_z<<endl;
break;
case 58: // "#nose_58
getline(model,line3);
lineV = line3.substr(2);
val0 = lineV.substr(0, lineV.find(' '));
val_x = (float)atof(val0.c_str());
line_size = val0.size();
val1 = lineV.substr(val0.length() + 1,lineV.find(' '));
val_y= (float)atof(val1.c_str());
val2 = lineV.substr(lineV.find_last_of(' ') + 1);
val_z= (float)atof(val2.c_str());
out<<"v "<<val_x-0.1<<" "<<val_y<<" "<<val_z<<endl;
break;
//
default:
out<<line2<<endl;
break;
}
}
}
}
model.close();
out.close();
}
我们似乎无法做到正确
在不使用难以学习的库的情况下，替代方法的任何帮助。