public static OBJData ParseOBJ(OBJParserStatus s, string path = null)
{
using (StreamReader reader = path != null ? StreamProvider(s, "obj", path) : s.Reader ?? StreamProvider(s, "obj", s.Path))
while (!reader.EndOfStream)
{
string line = reader.ReadLine().Trim();
if (line.Length == 0)
{
continue;
}
if (line[0] == '#' && (line.Length < 2 || line[1] != '!'))
{
continue;
}
if (2 < line.Length && line[0] == '#' && line[1] == '!')
{
line = line.Substring(2).Trim();
if (line.Length == 0)
{
continue;
}
ParseLineExt(s, line);
}
else
{
ParseLineStandard(s, line);
}
}
return(s.Data);
}
public static void ParseLineExt(OBJParserStatus s, string line)
{
string[] data = line.Split(' ');
switch (data[0])
{
case "objx":
case "import":
ParseOBJX(s, line.Substring(5));
return;
}
// Fallback for f.e. objx-only mtllibs
ParseLineStandard(s, line);
}
public static void ParseLineStandard(OBJParserStatus s, string line)
{
OBJObject o;
string[] data = line.Split(' ');
switch (data[0])
{
case "mtllib":
// Currently ignore material libraries.
return;
case "o":
o = new OBJObject(line.Substring(2), s.Current);
s.Data.Objects.Add(o);
s.Current = o.Groups[0];
s.CurrentMaterial = "";
return;
case "g":
if (s.Data.Objects.Count == 0)
{
o = new OBJObject("", s.Current);
s.Data.Objects.Add(o);
s.Current = o.Groups[0];
s.Current.Name = line.Substring(2);
}
else
{
s.Current = new OBJGroup(line.Substring(2), s.Current);
if (s.Current.PrevObj.Groups.Count == 2 &&
s.Current.PrevObj.Groups[0].Name == "")
{
s.Current.PrevObj.Groups.RemoveAt(0);
}
}
s.CurrentMaterial = "";
return;
case "v":
s.Current.Vertices.Add(_ParseV3(data, 1));
return;
case "vt":
s.Current.UVs.Add(_ParseV2(data, 1));
return;
case "vn":
s.Current.Normals.Add(_ParseV3(data, 1));
return;
case "usemtl":
// Currently ignore material usages.
s.Current.Materials.Add(line.Substring(7));
return;
case "s":
if (data[1] == "off")
{
// Currently ignore smoothing group disabling.
}
else
{
// Currently ignore smoothing group 1 - 32.
}
return;
case "f":
OBJGroup current = s.Current;
if (4 <= data.Length && data.Length < 6)
{
int[] indices = new int[data.Length - 1];
for (int i = 0; i < indices.Length; i++)
{
string elem = data[i + 1];
int iV = 0;
int iN = 0;
int iUV = 0;
if (elem.Contains("//"))
{
string[] parts = elem.Split('/');
iV = int.Parse(parts[0]);
iN = int.Parse(parts[2]);
}
else if (_Count(elem, '/', 2))
{
string[] parts = elem.Split('/');
iV = int.Parse(parts[0]);
iUV = int.Parse(parts[1]);
iN = int.Parse(parts[2]);
}
else if (!elem.Contains("/"))
{
iV = int.Parse(elem);
}
else
{
string[] parts = elem.Split('/');
iV = int.Parse(parts[0]);
iUV = int.Parse(parts[1]);
}
string cacheKey = $"{iV}; {iN}; {iUV}";
int cacheValue;
if (current.IndexCache.TryGetValue(cacheKey, out cacheValue))
{
indices[i] = cacheValue;
}
else
{
cacheValue = current.IndexCache.Count;
indices[i] = cacheValue;
current.IndexCache[cacheKey] = cacheValue;
if ((1 <= iV && iV <= current.Vertices.Count) ||
(iV < 0 && 1 <= (iV = iV + current.Vertices.Count + 1) && iV <= current.Vertices.Count))
{
current.UVertices.Add(current.Vertices[iV - 1]);
}
else
{
current.UVertices.Add(Vector3.zero);
}
if ((1 <= iN && iN <= current.Normals.Count) ||
(iN < 0 && 1 <= (iN = iN + current.Normals.Count + 1) && iN <= current.Normals.Count))
{
current.ContainsNormals = true;
current.UNormals.Add(current.Normals[iN - 1]);
}
else
{
current.UNormals.Add(Vector3.zero);
}
if ((1 <= iUV && iUV <= current.UVs.Count) ||
(iUV < 0 && 1 <= (iUV = iUV + current.UVs.Count + 1) && iUV <= current.UVs.Count))
{
current.UUVs.Add(current.UVs[iUV - 1]);
}
else
{
current.UUVs.Add(Vector2.zero);
}
}
}
OBJFace face = new OBJFace();
face.IndexMap = OBJFace.DefaultIndexMap;
face.RawIndices = indices;
face.Material = s.CurrentMaterial;
s.Current.AddFace(face);
if (indices.Length > 3)
{
face = new OBJFace();
face.IndexMap = OBJFace.SecondaryIndexMap;
face.RawIndices = indices;
face.Material = s.CurrentMaterial;
s.Current.AddFace(face);
}
}
return;
}
}
