File loader
Author
I don''t get errors when I compile this...but it doesn''t work the way I want(in fact it doesn''t work at all...). Here''s the general file format any help is greatly appreciated. It is a wavefront obj exported from milkshape... there are so many different types of this format, I wanted to load this myself.
////////////////////////
words that are unimportant
v float1 float2 float3
vt float1 float2
vn float1 float2 float3
f float1/float2/float3 float1/float2/float3 float1/float2/float3
////////////////////////
#include <iostream.h>
#include <fstream>
#include <string.h>
#include <vector>
using namespace std;
#define FILENAME "bessie.obj"
struct data
{
float x, y, z;
};
int main()
{
ifstream infile;
infile.open(FILENAME, ios::in);
char *character = "";
char *temp = "";
vector data(0);
for (int i=0; !infile.eof(); i++)
{
infile.get(character,255,'' '');
if (strcmp(character,"v") == 0)
{ // load in whatever "v" is
data.resize(i+1);
infile >> data.x >> data.y >> data.z;
} else if (strcmp(character,"vt") == 0)
{ // load in whatever "vt" is
data.resize(i+1);
infile >> data.x >> data.y;
} else if (strcmp(character,"vn") == 0)
{ // load in whatever "vn" is
data.resize(i+1);
infile >> data.x >> data.y >> data.z;
} else if (strcmp(character,"f") == 0)
{ // load in whatever "f" is
data.resize(i+3);
for (int a=1; a<=3; a++)
{
infile.get(temp,''/'');
data[a+i].x = atof(temp);
infile.get(temp,''/'');
data[a+i].y = atof(temp);
infile.get(temp,'' '' ''\n'');
data[a+i].z = atof(temp);
}
}
}
infile.close();
for (int j=0; j<data.capacity(); j++)
{
cout << data[j].x << "," << data[j].y << "," << data[j].z << endl;
}
return 0;
} </i>
-~-The Cow of Darkness-~-
Author
I can''t respond to this... keeps losing the server...agian:
-~-The Cow of Darkness-~-
#include <iostream.h>#include <fstream>#include <string.h>#include <vector>using namespace std;#define FILENAME "bessie.obj"struct data{ float x, y, z;};int main(){ ifstream infile; infile.open(FILENAME, ios::in); char *character; char *temp; vector<data> data(0); for (int i=0; !infile.eof(); i++) { infile.get(character, '' ''); if (strcmp(character,"v") == 0) { // load in whatever "v" is data.resize(i+1); infile >> data[i].x >> data[i].y >> data[i].z; } else if (strcmp(character,"vt") == 0) { // load in whatever "vt" is data.resize(i+1); infile >> data[i].x >> data[i].y; } else if (strcmp(character,"vn") == 0) { // load in whatever "vn" is data.resize(i+1); infile >> data[i].x >> data[i].y >> data[i].z; } else if (strcmp(character,"f") == 0) { // load in whatever "f" is for (int a=1; a<=3; a++) { infile.get(temp,''/''); data[a+i].x = atof(temp); infile.get(temp,''/''); data[a+i].y = atof(temp); infile.get(temp,''/''); data[a+i].z = atof(temp); } } } infile.close(); for (int j=0; j<data.capacity(); j++) { cout << data[j].x << "," << data[j].y << "," << data[j].z << endl; } return 0;} -~-The Cow of Darkness-~-
I don't know what compiler you are trying to use here, but I can't see how you expect this to work.
Calls to stream get methods require you to supply a buffer for it to put the data into. You are passing it an unitialised char pointer. I assume that this either seg faults or raises an exception os something similar.
I do not know the file format, so I can not really comment on the validity of the parser you have here.
You should at least so something like....
const int BUFFER_SIZE = 255;
char character[BUFFER_SIZE];
char temp[BUFFER_SIZE];
infile.get(&character, BUFFER_SIZE, ' '); // Make sure not to overflow the buffer.
Ciao
[edited by - SirHando on March 6, 2003 8:14:04 AM]
Calls to stream get methods require you to supply a buffer for it to put the data into. You are passing it an unitialised char pointer. I assume that this either seg faults or raises an exception os something similar.
I do not know the file format, so I can not really comment on the validity of the parser you have here.
You should at least so something like....
const int BUFFER_SIZE = 255;
char character[BUFFER_SIZE];
char temp[BUFFER_SIZE];
infile.get(&character, BUFFER_SIZE, ' '); // Make sure not to overflow the buffer.
Ciao
[edited by - SirHando on March 6, 2003 8:14:04 AM]
Learn STL better before trying to use it. Calling capacity() is wrong - should be size(). And you should use push_back() instead of resize() all the time. Here''s a rewritten version. Try to read each line and take note of the changes I''ve made
#include <iostream>#include <fstream>#include <string>#include <sstream>#include <vector>using namespace std;struct Data { float x, y, z;};int main() { //no need to use ios::in ifstream fin("bessie.obj"); //test if stream opened correctly if (!fin) return 1; //use a stringbuf to read data. It can''t overflow. stringbuf input; vector<Data> datas; while (!fin.eof()) { fin.get(input, '' ''); //this is the C++ way to compare strings. Doesn''t //work for char* if (input.str() == "v") { // load in whatever "v" is Data n; fin >> n.x >> n.y >> n.z; datas.push_back(n); } else if (input.str() == "vt") { // load in whatever "vt" is Data n; fin >> n.x >> n.y; datas.push_back(n); } else if (input.str() == "vn") { // load in whatever "vn" is Data n; fin >> n.x >> n.y >> n.z; datas.push_back(n); } else if (input.str() == "f") { // load in whatever "f" is Data n; stringstream s; for (int a=0; a<3; a++) { fin.get(input, ''/''); //c++ way to convert to float: s << input.str(); s >> n.x; fin.get(input, ''/''); s << input.str(); s >> n.y; fin.get(input, ''/''); s << input.str(); s >> n.z; datas.push_back(n); } } } //note datas.size(), not datas.capacity() for (size_t j=0; j<datas.size(); j++) cout << datas[j].x << "," << datas[j].y << "," << datas[j].z << endl;}
You have the format wrong. For the faces, it''s integers not floats:
f int/int/int int/int/int int/int/int
Since you''re exporting from Milkshape this isn''t a problem, but there''s 3 ints per face is only when you''re specifying vertex/texcoord/normal. One or two ints is also valid. More than three vertices is also valid and it''s rendered like a triangle fan (I believe). Faces includes vertex 1,2,3, then 1,3,4, then 1,4,5...
f int/int/int int/int/int int/int/int
Since you''re exporting from Milkshape this isn''t a problem, but there''s 3 ints per face is only when you''re specifying vertex/texcoord/normal. One or two ints is also valid. More than three vertices is also valid and it''s rendered like a triangle fan (I believe). Faces includes vertex 1,2,3, then 1,3,4, then 1,4,5...
Author
I''m extremely bad at file loading, and it really shows... I tried anonymous poster''s code, and it just hung and I got a white box saying I had no resources...
-~-The Cow of Darkness-~-
-~-The Cow of Darkness-~-
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