obj.h
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#ifndef STIM_OBJ_H
#define STIM_OBJ_H
#include <vector>
#include <sstream>
#include <fstream>
#include <stdlib.h>
#include <stim/parser/parser.h>
#include <stim/math/vector.h>
#include <algorithm>
#include <time.h>
namespace stim{
/** This class provides an interface for loading, saving, and working with Wavefront OBJ files.
* The class structure uses similar terminology to the OBJ file structure, so one familiar with it
* should be able to work well with this class.
*
* This class currently provides the ability to load explicitly defined geometric objects, including point lists,
* lines, and faces with positions, texture coordinates, and normals. This data is stored in a protected series
* of lists that are accessible to classes that extend this one.
*
* Multiple helper classes are used to facilitate loading, storing, and saving geometry. These are protected
* and therefore only designed to be used within the confines of the class. These helper classes include:
*
* vertex class - contains methods for loading, saving, and storing 1, 2, 3, and 4 component vectors
* triplet class - contains methods for loading, saving, and storing indexed vertices used for geometric objects
* geometry class - contains a list of triplets used to define a geometric structure, such as a face or line
*/
enum obj_type { OBJ_NONE, OBJ_LINE, OBJ_FACE, OBJ_POINTS, OBJ_TRIANGLE_STRIP };
template <typename T>
class obj{
protected:
enum token_type { OBJ_INVALID, OBJ_V, OBJ_VT, OBJ_VN, OBJ_P, OBJ_L, OBJ_F };
struct vertex : public stim::vec<T>{
using vec<T>::push_back;
using vec<T>::size;
using vec<T>::at;
using vec<T>::resize;
//basic constructors (call the stim::vector constructors)
vertex(){}
vertex(T x){
resize(1);
at(0) = x;
}
vertex(T x, T y) : stim::vec<T>(x, y){}
vertex(T x, T y, T z) : stim::vec<T>(x, y, z){}
vertex(T x, T y, T z, T w) : stim::vec<T>(x, y, z, w){}
vertex(stim::vec<T> rhs) : stim::vec<T>(rhs){}
//constructor creates a vertex from a line string
vertex(std::string line){
//create a temporary vector used to store string tokens
std::vector<std::string> tokens = stim::parser::split(line, ' ');
//create temporary storage for casting the token values
T val;
//for each token (skipping the first)
for(unsigned int i = 1; i < tokens.size(); i++){
std::stringstream ss(tokens[i]); //create a stringstream object for casting
ss>>val; //cast the token to the correct numerical value
push_back(val); //push the coordinate into the vertex
}
}
//output the vertex as a string
std::string str(){
std::stringstream ss;
for(int i = 0; i < size(); i++){
if(i > 0)
ss<<' ';
ss<<at(i);
}
return ss.str(); //return the vertex string
}
}; //end vertex
//triplet used to specify geometric vertices consisting of a position vertex, texture vertex, and normal
struct triplet : public std::vector<unsigned int>{
//default constructor, empty triplet
triplet(){}
//create a triplet given a parameter list (OBJ indices start at 1, so 0 can be used to indicate no value)
triplet(unsigned int v, unsigned int vt = 0, unsigned int vn = 0){
push_back(v);
if(vn != 0){
push_back(vt);
push_back(vn);
}
else if(vt != 0)
push_back(vt);
}
//build a triplet from a string
triplet(std::string s){
//create a temporary vector used to store string tokens
std::vector<std::string> tokens = stim::parser::split(s, '\\');
//std::cout<<"processing triplet: "<<s<<std::endl;
if(tokens.size() >= 1)
push_back( atoi( tokens[0].c_str() ) );
if(tokens.size() >= 2){
if(tokens[1].length())
push_back( atoi( tokens[1].c_str() ) );
else
push_back(0);
}
if(tokens.size() == 3)
push_back( atoi( tokens[2].c_str() ) );
}
//output the geometry as a string
std::string str(){
std::stringstream ss;
ss<<at(0); //the vertex is always the first value
if(size() == 3){
if(at(1) == 0)
ss<<"\\\\"<<at(2);
else
ss<<'\\'<<at(1)<<'\\'<<at(2);
}
else if(size() == 2)
ss<<"\\"<<at(1);
return ss.str();
}
}; //end triplet
//geometry used to specify a geometric structure consisting of several triplets
struct geometry : public std::vector<triplet>{
using std::vector<triplet>::size;
using std::vector<triplet>::at;
using std::vector<triplet>::push_back;
using std::vector<triplet>::resize;
geometry(){}
//constructs a geometry object from a line read from an OBJ file
geometry(std::string line){
//create a temporary vector used to store string tokens
std::vector<std::string> tokens = stim::parser::split(line, ' ');
resize(tokens.size() - 1); //set the geometry size based on the number of tokens
//for each triplet in the line
for(unsigned int i = 1; i < tokens.size(); i++){
//construct the triplet and push it to the geometry
//push_back( triplet(tokens[i]) );
at(i-1) = triplet(tokens[i]);
}
}
//returns a vector containing the vertex indices for the geometry
void get_v(std::vector<unsigned>& v){
v.resize(size()); //resize the vector to match the number of vertices
for(unsigned int i = 0; i<size(); i++){ //for each vertex
v[i] = at(i)[0]; //copy the vertex index (1st element of triplet)
}
}
void get_vt(std::vector<unsigned>& vt){
vt.resize(size()); //resize the vector to match the number of vertices
for(unsigned int i = 0; i<size(); i++) //for each vertex
vt[i] = at(i)[1]; //copy the vertex texture index (2nd element of triplet)
}
void get_vn(std::vector<unsigned>& vn){
vn.resize(size()); //resize the vector to match the number of vertices
for(unsigned int i = 0; i<size(); i++) //for each vertex
vn[i] = at(i)[2]; //copy the vertex index
}
std::string str(){
std::stringstream ss;
for(unsigned int i = 0; i < size(); i++){
if(i != 0)
ss<<' ';
ss<<at(i).str();
}
return ss.str();
}
};
std::vector<vertex> V; //vertex spatial position
std::vector<vertex> VN;
std::vector<vertex> VT;
//structure lists
std::vector<geometry> L; //list of lines
std::vector<geometry> P; //list of points structures
std::vector<geometry> F; //list of faces
//information for the current geometric object
geometry current_geo;
vertex current_vt;
vertex current_vn;
//flags for the current geometric object
obj_type current_type;
bool geo_flag_vt;
bool geo_flag_vn;
bool vert_flag_vt;
bool vert_flag_vn;
void update_vt(vertex vt){
current_vt = vt;
//the geometry vertex texture flag can only be set for the first vertex
if(current_geo.size() == 0)
geo_flag_vt = true;
vert_flag_vt = true;
}
void update_vn(vertex vn){
current_vn = vn;
//the geometry normal flag can only be set for the first vertex
if(current_geo.size() == 0)
geo_flag_vn = true;
vert_flag_vn = true;
}
//create a triple and add it to the current geometry
void update_v(vertex vv){
unsigned int v;
unsigned int vt = 0;
unsigned int vn = 0;
//if the current geometry is using a texture coordinate, add the current texture coordinate to the geometry
if(geo_flag_vt){
if(vert_flag_vt) //don't add it more than once
VT.push_back(current_vt);
vt = VT.size();
}
//if the current geometry is using a normal, add the current texture coordinate to the geometry
if(geo_flag_vn){
if(vert_flag_vn) //don't add it more than once
VN.push_back(current_vn);
vn = VN.size();
}
//add the current vertex position to the geometry
V.push_back(vv);
v = V.size();
//create a triplet and add it to the current geometry
current_geo.push_back(triplet(v, vt, vn));
//clear the vertex flags
vert_flag_vt = false;
vert_flag_vn = false;
}
void init(){
//clear all lists
V.clear();
VT.clear();
VN.clear();
P.clear();
L.clear();
F.clear();
//initialize all of the flags
current_type = OBJ_NONE;
geo_flag_vt = false;
geo_flag_vn = false;
vert_flag_vt = false;
vert_flag_vn = false;
}
//gets the type of token representing the entry in the OBJ file
token_type get_token(std::string s){
//if the line contains a vertex
if(s[0] == 'v'){
if(s[1] == ' ') return OBJ_V;
if(s[1] == 't') return OBJ_VT;
if(s[1] == 'n') return OBJ_VN;
}
if(s[0] == 'l' && s[1] == ' ') return OBJ_L;
if(s[0] == 'p' && s[1] == ' ') return OBJ_P;
if(s[0] == 'f' && s[1] == ' ') return OBJ_F;
return OBJ_INVALID;
}
public:
/// Constructor loads a Wavefront OBJ file
obj(std::string filename){
load(filename);
}
//functions for setting the texture coordinate for the next vertex
void TexCoord(T x){ update_vt(vertex(x));}
void TexCoord(T x, T y){ update_vt(vertex(x, y));}
void TexCoord(T x, T y, T z){ update_vt(vertex(x, y, z));}
void TexCoord(T x, T y, T z, T w){ update_vt(vertex(x, y, z, w));}
//functions for setting the normal for the next vertex
void Normal(T x){ update_vn(vertex(x));}
void Normal(T x, T y){ update_vn(vertex(x, y));}
void Normal(T x, T y, T z){ update_vn(vertex(x, y, z));}
void Normal(T x, T y, T z, T w){ update_vn(vertex(x, y, z, w));}
//functions for setting the next vertex position (note that this updates the current geometry)
void Vertex(T x){ update_v(vertex(x));}
void Vertex(T x, T y){ update_v(vertex(x, y));}
void Vertex(T x, T y, T z){ update_v(vertex(x, y, z));}
void Vertex(T x, T y, T z, T w){ update_v(vertex(x, y, z, w));}
///This function starts drawing of a primitive object, such as a line, face, or point set
/// @param t is the type of object to be drawn: OBJ_POINTS, OBJ_LINE, OBJ_FACE
void Begin(obj_type t){
current_type = t;
}
//generates a list of faces from a list of points, assuming the input list forms a triangle strip
std::vector<geometry> genTriangleStrip(geometry s) {
if (s.size() < 3) return std::vector<geometry>(); //return an empty list if there aren't enough points to form a triangle
size_t nt = s.size() - 2; //calculate the number of triangles in the strip
std::vector<geometry> r(nt); //create a list of geometry objects, where the number of faces = the number of triangles in the strip
r[0].push_back(s[0]);
r[0].push_back(s[1]);
r[0].push_back(s[2]);
for (size_t i = 1; i < nt; i++) {
if (i % 2) {
r[i].push_back(s[i + 1]);
r[i].push_back(s[i + 0]);
r[i].push_back(s[i + 2]);
}
else {
r[i].push_back(s[i + 0]);
r[i].push_back(s[i + 1]);
r[i].push_back(s[i + 2]);
}
}
return r;
}
/// This function terminates drawing of a primitive object, such as a line, face, or point set
void End(){
//copy the current object to the appropriate list
if(current_geo.size() != 0)
{
switch(current_type){
case OBJ_NONE:
std::cout<<"STIM::OBJ error, objEnd() called before objBegin()."<<std::endl;
break;
case OBJ_POINTS:
P.push_back(current_geo);
break;
case OBJ_LINE:
L.push_back(current_geo);
break;
case OBJ_FACE:
F.push_back(current_geo);
break;
case OBJ_TRIANGLE_STRIP:
std::vector<geometry> tstrip = genTriangleStrip(current_geo); //generate a list of faces from the current geometry
F.insert(F.begin(), tstrip.begin(), tstrip.end()); //insert all of the triangles into the face list
break;
}
}
//clear everything
current_type = OBJ_NONE;
current_geo.clear();
vert_flag_vt = false;
vert_flag_vn = false;
geo_flag_vt = false;
geo_flag_vn = false;
}
//temporary convenience method
void rev(){
if(current_geo.size() != 0)
// current_geo.reverse(current_geo.begin(), current_geo.end());
std::reverse(current_geo.begin(), current_geo.end());
}
//output the OBJ structure as a string
std::string str(){
std::stringstream ss;
unsigned int i;
//output all of the vertices
if(V.size()){
ss<<"#vertex positions"<<std::endl;
for(i = 0; i < V.size(); i++){
ss<<"v "<<V[i].str()<<std::endl;
}
}
//output all of the texture coordinates
if(VT.size()){
ss<<std::endl<<"#vertex texture coordinates"<<std::endl;
for(i = 0; i < VT.size(); i++){
ss<<"vt "<<VT[i].str()<<std::endl;
}
}
//output all of the normals
if(VN.size()){
ss<<std::endl<<"#vertex normals"<<std::endl;
for(i = 0; i < VN.size(); i++){
ss<<"vn "<<VN[i].str()<<std::endl;
}
}
//output all of the points
if(P.size()){
ss<<std::endl<<"#point structures"<<std::endl;
for(i = 0; i < P.size(); i++){
ss<<"p "<<P[i].str()<<std::endl;
}
}
//output all of the lines
if(L.size()){
ss<<std::endl<<"#line structures"<<std::endl;
for(i = 0; i < L.size(); i++){
ss<<"l "<<L[i].str()<<std::endl;
}
}
//output all of the lines
if(F.size()){
ss<<std::endl<<"#face structures"<<std::endl;
for(i = 0; i < F.size(); i++){
ss<<"f "<<F[i].str()<<std::endl;
}
}
return ss.str(); //return the constructed string
}
obj(){
init(); //private function that initializes everything
}
void clear(){
init();
}
/// This function saves the current structure as a Wavefront OBJ file
/// @param filename is the name of the file to be saved
bool save(std::string filename){
std::ofstream outfile(filename.c_str());
if(!outfile){
std::cout<<"STIM::OBJ error opening file for writing"<<std::endl;
return false;
}
//output the OBJ data to the file
outfile<<str();
//close the file
outfile.close();
return true;
}
/// Load a Wavefront OBJ file (support for faces, lines, and point lists)
/// @param filename is the name of the OBJ file to load
bool load(std::string filename){
//load the file
std::ifstream infile(filename.c_str());
//if the file is invalid, throw an error
if(!infile){
std::cout<<"STIM::OBJ Error loading file "<<filename<<std::endl;
return false;
}
std::string line;
getline(infile, line); //get the first line
unsigned int l = 0;
while(infile){
l++;
//unsigned int t = time(NULL);
//get the token representing the first parameter
token_type token = get_token(line);
switch(token){
case OBJ_INVALID:
break;
case OBJ_V:
V.push_back(vertex(line));
break;
case OBJ_VT:
VT.push_back(vertex(line));
break;
case OBJ_VN:
VN.push_back(vertex(line));
break;
case OBJ_F:
F.push_back(geometry(line));
break;
case OBJ_L:
L.push_back(geometry(line));
break;
};
//get the next line
getline(infile, line);
}
//close the file
infile.close();
return true;
}
/// Return the number of position vertices in the OBJ model
unsigned int numV(){
return V.size();
}
/// Retrieve the vertex stored in index i
/// @param vi is the desired vertex index
stim::vec<T> getV(unsigned int vi){
stim::vec<T> v = V[vi];
return v;
}
std::vector< stim::vec<T> > getAllV(std::vector<unsigned> vertexIndices){
std::vector< stim::vec<T> > allVerticesList;
for (unsigned int i=0; i<numV(); i++)
{
vertexIndices[i] = i + 1;
}
allVerticesList = getV(vertexIndices);
return allVerticesList;
}
int
getIndex(std::vector< stim::vec<T> >allVerticesList, stim::vec<T> v0)
{
int result = 0;
for (unsigned int i = 0; i < allVerticesList.size() ; i++)
{
if (allVerticesList[i] == v0)
{
result = i;
}
}
return result;
}
/// Retrieve the vertex texture coordinate at index i
/// @param vti is the desired index
stim::vec<T> getVT(unsigned int vti){
stim::vec<T> vt = VT[vti];
return vt;
}
/// Retrieve the vertex normal at index i
/// @param vni is the desired index
stim::vec<T> getVN(unsigned int vni){
stim::vec<T> vn = VN[vni];
return vn;
}
/// Retrieve a vertex stored at a list of given indices
/// @param vi is an array containing a series of indices
std::vector< stim::vec<T> > getV( std::vector<unsigned> vi ){
std::vector< stim::vec<T> > v;
v.resize(vi.size()); //pre-allocate an array of vertices
for(unsigned i = 0; i < vi.size(); i++)
v[i] = V[vi[i] - 1];
return v; //return the array of vertices
}
/// Retrieve a vertex stored at a list of given indices
/// @param vi is an array containing a series of indices
std::vector< stim::vec<T> > getVT( std::vector<unsigned> vti ){
std::vector< stim::vec<T> > vt;
vt.resize(vti.size()); //pre-allocate an array of vertices
for(unsigned i = 0; i < vti.size(); i++)
vt[i] = VT[vti[i] - 1];
return vt; //return the array of vertices
}
/// Retrieve a vertex stored at a list of given indices
/// @param vi is an array containing a series of indices
std::vector< stim::vec<T> > getVN( std::vector<unsigned> vni ){
std::vector< stim::vec<T> > vn;
vn.resize(vni.size()); //pre-allocate an array of vertices
for(unsigned i = 0; i < vni.size(); i++)
vn[i] = VN[vni[i] - 1];
return vn; //return the array of vertices
}
stim::vec<T> centroid(){
//get the number of coordinates
unsigned int N = V[0].size();
//allocate space for the minimum and maximum coordinate points (bounding box corners)
stim::vec<float> vmin, vmax;
vmin.resize(N);
vmax.resize(N);
//find the minimum and maximum value for each coordinate
unsigned int NV = V.size();
for(unsigned int v = 0; v < NV; v++)
for(unsigned int i = 0; i < N; i++){
if(V[v][i] < vmin[i])
vmin[i] = V[v][i];
if(V[v][i] > vmax[i])
vmax[i] = V[v][i];
}
//find the centroid using the min and max points
stim::vec<T> c = vmin * 0.5 + vmax * 0.5;
return c;
}
/// Returns the number of lines in the OBJ structure
unsigned int numL(){
return L.size();
}
/// Returns all points in the line corresponding to a given index
/// @param i is the index of the desired line
std::vector< stim::vec<T> > getL_V(unsigned int i){
//get the number of points in the specified line
unsigned int nP = L[i].size();
//create a vector of points
std::vector< stim::vec<T> > l;
//set the size of the vector
l.resize(nP);
//copy the points from the point list to the stim vector
unsigned int pie;
for(unsigned int p = 0; p < nP; p++){
//get the index of the geometry point
pie = L[i][p][0] - 1;
//get the coordinates of the current point
stim::vec<T> newP = V[pie];
//copy the point into the vector
l[p] = newP;
}
return l;
}
/// Returns the vertex indices for the specified line
/// @param i is the index of the line
std::vector< unsigned int > getL_Vi(unsigned int i){
unsigned int nP = L[i].size();
std::vector< unsigned int > l;
//set the size of the vector
l.resize(nP);
//copy the indices from the geometry structure to the array
for(unsigned int p = 0; p < nP; p++){
l[p] = L[i][p][0];
}
return l;
}
/// Returns a vector containing the list of texture coordinates associated with each point of a line.
/// @param i is the index of the desired line
std::vector< stim::vec<T> > getL_VT(unsigned int i){
//get the number of points in the specified line
unsigned int nP = L[i].size();
//create a vector of points
std::vector< stim::vec<T> > l;
//set the size of the vector
l.resize(nP);
//copy the points from the point list to the stim vector
unsigned int pie;
for(unsigned int p = 0; p < nP; p++){
//get the index of the geometry point
pie = L[i][p][1] - 1;
//get the coordinates of the current point
stim::vec<T> newP = VT[pie];
//copy the point into the vector
l[p] = newP;
}
return l;
}
/// Add an array of vertices to the vertex list
unsigned int addV(std::vector< stim::vec<T> > vertices){
unsigned int NV = vertices.size(); //get the total number of new vertices
unsigned int currentV = V.size() + 1; //store the index to the first submitted point
//for each vertex
for(unsigned int vi = 0; vi < NV; vi++){
vertex v(vertices[vi]);
V.push_back(v);
}
//return the index to the first point
return currentV;
}
/// Add a line to the object
void addLine(std::vector<unsigned> v, std::vector<unsigned> vt = std::vector<unsigned>(), std::vector<unsigned> vn = std::vector<unsigned>()){
//create a new line geometry
geometry new_line;
unsigned int v_i, vt_i, vn_i;
for(unsigned int i = 0; i < v.size(); i++){
v_i = vt_i = vn_i = 0;
v_i = v[i];
if(vt.size() != 0)
vt_i = vt[i];
if(vn.size() != 0)
vn_i = vn[i];
new_line.push_back(triplet(v_i, vt_i, vn_i));
}
//push the new geometry to the line list
L.push_back(new_line);
}
/// Fills three std::vector structures with the indices representing a line
/// @param l is the line index
/// @param vi is a vertex index array that will be filled
void getLinei(unsigned l, std::vector<unsigned>& vi){
L[l-1].get_v(vi);
}
/// Fills three std::vector structures with the indices representing a line
/// @param l is the line index
/// @param vi is a vertex index array that will be filled
/// @param vti is a vertex texture coordinate index array that will be filled
void getLinei(unsigned l, std::vector<unsigned>& vi, std::vector<unsigned>& vti){
getLinei(l, vi);
L[l-1].get_vt(vti);
}
/// Fills three std::vector structures with the indices representing a line
/// @param l is the line index
/// @param vi is a vertex index array that will be filled
/// @param vti is a vertex texture coordinate index array that will be filled
/// @param vni is a vertex normal index array that will be filled
void getLinei(unsigned l, std::vector<unsigned>& vi, std::vector<unsigned>& vti, std::vector<unsigned>& vni){
getLinei(l, vi, vti);
L[l-1].get_vn(vni);
}
/// Returns a list of points corresponding to the vertices of a line
void getLine(unsigned l, std::vector< stim::vec<T> >& v){
std::vector<unsigned> vi; //create a vector to store indices to vertices
getLinei(l, vi); //get the indices for the line vertices
v = getV(vi); //get the vertices corresponding to the indices
}
void getLine(unsigned l, std::vector< stim::vec<T> >& v, std::vector< stim::vec<T> >& vt){
std::vector<unsigned> vi, vti;
getLinei(l, vi, vti); //get the indices for the line vertices
v = getV(vi); //get the vertices corresponding to the indices
vt = getVT(vti);
}
void getLine(unsigned l, std::vector< stim::vec<T> >& v,
std::vector< stim::vec<T> >& vt,
std::vector< stim::vec<T> >& vn){
std::vector<unsigned> vi, vti, vni;
getLinei(l, vi, vti, vni); //get the indices for the line vertices
v = getV(vi); //get the vertices corresponding to the indices
vt = getVT(vti);
vn = getVN(vni);
}
};
};
#endif