void TriMeshObjLoader::load(const std::string& filename)
{
pathname = get_path(filename);
FILE *fp = fopen(filename.data(), "r");
if (fp==0) {
cerr << "File " << filename << " does not exist" << endl;
exit(0);
}
mesh->materials.resize(1);
char buf[256];
float3 v_geo;
float3 v_normals;
float3 v_texcoords;
uint3 f_geo;
uint3 f_normals;
uint3 f_texcoords;
int current_material=0;
int v, n, t;
while(fscanf(fp, "%s", buf) != EOF)
{
switch(buf[0])
{
case '#': // A comment
fgets(buf, sizeof(buf), fp);
break;
case 'm':
fgets(buf, sizeof(buf), fp);
sscanf(buf, "%s %s", buf, buf);
read_material_library(buf, mesh->materials);
break;
case 'u':
fgets(buf, sizeof(buf), fp);
sscanf(buf, "%s %s", buf, buf);
current_material = mesh->find_material(buf);
break;
case 'v': // v, vn, vt
switch(buf[1])
{
case '\0': // vertex
fscanf(fp, "%f %f %f", &v_geo.x, &v_geo.y, &v_geo.z);
mesh->geometry.add_vertex(v_geo);
break;
case 'n': // normal
fscanf(fp, "%f %f %f", &v_normals.x, &v_normals.y, &v_normals.z);
mesh->normals.add_vertex(v_normals);
break;
case 't': // texcoord
fscanf(fp, "%f %f", &v_texcoords.x, &v_texcoords.y);
v_texcoords.z=1;
mesh->texcoords.add_vertex(v_texcoords);
break;
}
break;
case 'f':
v = n = t = 0;
fscanf(fp, "%s", buf);
// can be one of %d, %d//%d, %d/%d, %d/%d/%d
if(sscanf(buf, "%d/%d/%d", &v, &t, &n) == 3)
{ // v/t/n
f_geo.x = get_vert(v);
f_texcoords.x = get_texcoord(t);
f_normals.x = get_normal(n);
fscanf(fp, "%d/%d/%d", &v, &t, &n);
f_geo.y = get_vert(v);
f_texcoords.y = get_texcoord(t);
f_normals.y = get_normal(n);
fscanf(fp, "%d/%d/%d", &v, &t, &n);
f_geo.z = get_vert(v);
f_texcoords.z = get_texcoord(t);
f_normals.z = get_normal(n);
int idx = mesh->geometry.add_face(f_geo);
mesh->normals.add_face(f_normals, idx);
mesh->texcoords.add_face(f_texcoords, idx);
mesh->mat_idx.push_back(current_material);
// Load a general polygon and convert to triangles
while(fscanf(fp, "%d/%d/%d", &v, &t, &n) == 3)
{
f_geo.y = f_geo.z;
f_normals.y = f_normals.z;
f_texcoords.y = f_texcoords.z;
f_geo.z = get_vert(v);
f_normals.z = get_normal(n);
f_texcoords.z = get_texcoord(t);
int idx = mesh->geometry.add_face(f_geo);
mesh->normals.add_face(f_normals, idx);
mesh->texcoords.add_face(f_texcoords, idx);
mesh->mat_idx.push_back(current_material);
}
}
else if (sscanf(buf, "%d//%d", &v, &n) == 2)
{// v//n
f_geo.x = get_vert(v);
f_normals.x = get_normal(n);
fscanf(fp, "%d//%d", &v, &n);
f_geo.y = get_vert(v);
f_normals.y = get_normal(n);
fscanf(fp, "%d//%d", &v, &n);
f_geo.z = get_vert(v);
f_normals.z = get_normal(n);
int idx = mesh->geometry.add_face(f_geo);
mesh->normals.add_face(f_normals, idx);
mesh->mat_idx.push_back(current_material);
// Load a general polygon and convert to triangles
while(fscanf(fp, "%d//%d", &v, &n) == 2)
{
f_geo.y = f_geo.z;
f_normals.y = f_normals.z;
f_geo.z = get_vert(v);
int idx = mesh->geometry.add_face(f_geo);
mesh->normals.add_face(f_normals, idx);
mesh->mat_idx.push_back(current_material);
}
}
else if (sscanf(buf, "%d/%d", &v, &t) == 2)
{ // v/t
f_geo.x = get_vert(v);
f_texcoords.x = get_texcoord(t);
fscanf(fp, "%d/%d", &v, &t);
f_geo.y = get_vert(v);
f_texcoords.y = get_texcoord(t);
fscanf(fp, "%d/%d", &v, &t);
f_geo.z = get_vert(v);
f_texcoords.z = get_texcoord(t);
int idx = mesh->geometry.add_face(f_geo);
mesh->texcoords.add_face(f_texcoords, idx);
mesh->mat_idx.push_back(current_material);
// Load a general polygon and convert to triangles
while(fscanf(fp, "%d/%d", &v, &t)==2)
{
f_geo.y = f_geo.z;
f_texcoords.y = f_texcoords.z;
f_geo.z = get_vert(v);
f_texcoords.z = get_texcoord(t);
int idx = mesh->geometry.add_face(f_geo);
mesh->texcoords.add_face(f_texcoords, idx);
mesh->mat_idx.push_back(current_material);
}
}
else if (sscanf(buf, "%d", &v)==1)
{ // v
f_geo.x = get_vert(v);
fscanf(fp, "%d", &v);
f_geo.y = get_vert(v);
fscanf(fp, "%d", &v);
f_geo.z = get_vert(v);
mesh->geometry.add_face(f_geo);
mesh->mat_idx.push_back(current_material);
// Load a general polygon and convert to triangles
while(fscanf(fp, "%d", &v)==1)
{
f_geo.y = f_geo.z;
f_geo.z = get_vert(v);
mesh->geometry.add_face(f_geo);
mesh->mat_idx.push_back(current_material);
}
}
break;
default:
fgets(buf, sizeof(buf), fp);
break;
}
}
fclose(fp);
}
