Maybe z-fighting? How is your geometry organized? How are you generating it? What is the 'box' around everything?...and lastly, out of sheer curiousity, why is everything green?
There's nothing technical behind coloring everything green. Green is supposed to represent a forest terrain, it reminds me of final fantasy, specifically ff tactics.
But I import all models through a .obj importer that is like this one, except I changed it to save all verts,normals,faces and not discards them after saving the model to a display list, then wrapped it in a class:
int loadObject(const char* filename)
{
std::vector<std::string*> coord; //read every single line of the obj file as a string
std::vector<coordinate*> vertex;
std::vector<face*> faces;
std::vector<coordinate*> normals; //normal vectors for every face
std::ifstream in(filename); //open the .obj file
if(!in.is_open()) //if not opened, exit with -1
{
std::cout << "Nor oepened" << std::endl;
return -1;
}
char buf[256];
//read in every line to coord
while(!in.eof())
{
in.getline(buf,256);
coord.push_back(new std::string(buf));
}
//go through all of the elements of coord, and decide what kind of element is that
for(int i=0;i<coord.size();i++)
{
if(coord[i]->c_str()[0]=='#') //if it is a comment (the first character is #)
continue; //we don't care about that
else if(coord[i]->c_str()[0]=='v' && coord[i]->c_str()[1]==' ') //if vector
{
float tmpx,tmpy,tmpz;
sscanf(coord[i]->c_str(),"v %f %f %f",&tmpx,&tmpy,&tmpz); //read in the 3 float coordinate to tmpx,tmpy,tmpz
vertex.push_back(new coordinate(tmpx,tmpy,tmpz)); //and then add it to the end of our vertex list
}else if(coord[i]->c_str()[0]=='v' && coord[i]->c_str()[1]=='n') //if normal vector
{
float tmpx,tmpy,tmpz; //do the same thing
sscanf(coord[i]->c_str(),"vn %f %f %f",&tmpx,&tmpy,&tmpz);
normals.push_back(new coordinate(tmpx,tmpy,tmpz));
}else if(coord[i]->c_str()[0]=='f') //if face
{
int a,b,c,d,e;
if(count(coord[i]->begin(),coord[i]->end(),' ')==3) //if it is a triangle (it has 3 space in it)
{
sscanf(coord[i]->c_str(),"f %d//%d %d//%d %d//%d",&a,&b,&c,&b,&d,&b);
faces.push_back(new face(b,a,c,d)); //read in, and add to the end of the face list
}else{
sscanf(coord[i]->c_str(),"f %d//%d %d//%d %d//%d %d//%d",&a,&b,&c,&b,&d,&b,&e,&b);
faces.push_back(new face(b,a,c,d,e)); //do the same, except we call another constructor, and we use different pattern
}
}
}
//raw
int num; //the id for the list
num=glGenLists(1); //generate a uniqe
glNewList(num,GL_COMPILE); //and create it
for(int i=0;i<faces.size();i++)
{
if(faces[i]->four) //if it's a quad draw a quad
{
glBegin(GL_QUADS);
//basically all I do here, is use the facenum (so the number of the face) as an index for the normal, so the 1st normal owe to the first face
//I subtract 1 because the index start from 0 in C++
glNormal3f(normals[faces[i]->facenum-1]->x,normals[faces[i]->facenum-1]->y,normals[faces[i]->facenum-1]->z);
//draw the faces
glVertex3f(vertex[faces[i]->faces[0]-1]->x,vertex[faces[i]->faces[0]-1]->y,vertex[faces[i]->faces[0]-1]->z);
glVertex3f(vertex[faces[i]->faces[1]-1]->x,vertex[faces[i]->faces[1]-1]->y,vertex[faces[i]->faces[1]-1]->z);
glVertex3f(vertex[faces[i]->faces[2]-1]->x,vertex[faces[i]->faces[2]-1]->y,vertex[faces[i]->faces[2]-1]->z);
glVertex3f(vertex[faces[i]->faces[3]-1]->x,vertex[faces[i]->faces[3]-1]->y,vertex[faces[i]->faces[3]-1]->z);
glEnd();
}else{
glBegin(GL_TRIANGLES);
glNormal3f(normals[faces[i]->facenum-1]->x,normals[faces[i]->facenum-1]->y,normals[faces[i]->facenum-1]->z);
glVertex3f(vertex[faces[i]->faces[0]-1]->x,vertex[faces[i]->faces[0]-1]->y,vertex[faces[i]->faces[0]-1]->z);
glVertex3f(vertex[faces[i]->faces[1]-1]->x,vertex[faces[i]->faces[1]-1]->y,vertex[faces[i]->faces[1]-1]->z);
glVertex3f(vertex[faces[i]->faces[2]-1]->x,vertex[faces[i]->faces[2]-1]->y,vertex[faces[i]->faces[2]-1]->z);
glEnd();
}
}
glEndList();
//delete everything to avoid memory leaks
for(int i=0;i<coord.size();i++)
delete coord[i];
for(int i=0;i<faces.size();i++)
delete faces[i];
for(int i=0;i<normals.size();i++)
delete normals[i];
for(int i=0;i<vertex.size();i++)
delete vertex[i];
return num; //return with the id
}
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The green box is just a couple of plain quads that house my scene.
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