Pixyco-XYZ/openmesh
5
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Merge branch 'OBJ-loader-negative-indices' into 'master'

Browse Source 
Fix for handling negative indices in OBJ loader

This fix resolves an issue that occurrs with the current code that uses two passes to parse the OBJ - see my previous merge request:
https://graphics.rwth-aachen.de:9000/OpenMesh/OpenMesh/merge_requests/84

Sorry for the trouble! :-(

To verify that the negative indices were really not working any more, and to check that this fix resolves the issue, I used the Cornell Box example from the tiny OBJ loader project:
https://github.com/syoyo/tinyobjloader/blob/master/models/cornell_box.obj

See merge request !93
This commit is contained in:
Jan Möbius
2016-10-02 13:53:00 +02:00
parent 29ba85a7f0 a6da330b41
commit f3ffa2a27c
1 changed files with 22 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

25
src/OpenMesh/Core/IO/reader/OBJReader.cc
View File

@@ -443,6 +443,10 @@ read(std::istream& _in, BaseImporter& _bi, Options& _opt)
_in.clear();
_in.seekg(0, std::ios::beg);
int nCurrentPositions = 0,
nCurrentTexcoords = 0,
nCurrentNormals = 0;
// pass 2: read faces
while( _in && !_in.eof() )
{
@@ -512,6 +516,21 @@ read(std::istream& _in, BaseImporter& _bi, Options& _opt)
matname="";
}
}
// track current number of parsed vertex attributes,
// to allow for OBJs negative indices
else if (keyWrd == "v")
{
++nCurrentPositions;
}
else if (keyWrd == "vt")
{
++nCurrentTexcoords;
}
else if (keyWrd == "vn")
{
++nCurrentNormals;
}
// faces
else if (keyWrd == "f")
@@ -592,7 +611,7 @@ read(std::istream& _in, BaseImporter& _bi, Options& _opt)
// Calculation of index :
// -1 is the last vertex in the list
// As obj counts from 1 and not zero add +1
value = int(_bi.n_vertices() + value + 1);
value = nCurrentPositions + value + 1;
}
// Obj counts from 1 and not zero .. array counts from zero therefore -1
vhandles.push_back(VertexHandle(value-1));
@@ -612,7 +631,7 @@ read(std::istream& _in, BaseImporter& _bi, Options& _opt)
// Calculation of index :
// -1 is the last vertex in the list
// As obj counts from 1 and not zero add +1
value = int(texcoords.size()) + value + 1;
value = nCurrentTexcoords + value + 1;
}
assert(!vhandles.empty());
@@ -649,7 +668,7 @@ read(std::istream& _in, BaseImporter& _bi, Options& _opt)
// Calculation of index :
// -1 is the last vertex in the list
// As obj counts from 1 and not zero add +1
value = int(normals.size()) + value + 1;
value = nCurrentNormals + value + 1;
}
// Obj counts from 1 and not zero .. array counts from zero therefore -1