/// <summary>
///
/// </summary>
/// <param name="objFile">obj file path</param>
public ObjParser(string objFile) : this(objFile, MtlParser.InitEncoding(objFile))
{
}
/// <summary>
/// get parsed obj model
/// </summary>
/// <returns></returns>
public ObjModel GetModel()
{
if (_model == null)
{
var modelName = "Untitled";
if (!String.IsNullOrEmpty(_objFile))
{
modelName = Path.GetFileNameWithoutExtension(_objFile);
}
_model = new ObjModel {
Name = modelName
};
while (!_reader.EndOfStream)
{
var line = _reader.ReadLine().Trim();
if (String.IsNullOrEmpty(line))
{
continue;
}
if (line.StartsWith("#"))
{
continue;
}
if (StartWith(line, "mtllib"))
{
_model.MatFilename = line.Substring(6).Trim();
}
else if (StartWith(line, "v"))
{
var vStr = line.Substring(1).Trim();
var strs = SplitLine(vStr);
var v = new Vec3(double.Parse(strs[0]), double.Parse(strs[1]), double.Parse(strs[2]));
_model.Vertices.Add(v);
}
else if (StartWith(line, "vn"))
{
var vnStr = line.Substring(2).Trim();
var strs = SplitLine(vnStr);
var vn = new Vec3(double.Parse(strs[0]), double.Parse(strs[1]), double.Parse(strs[2]));
_model.Normals.Add(vn);
}
else if (StartWith(line, "vt"))
{
var vtStr = line.Substring(2).Trim();
var strs = SplitLine(vtStr);
var vt = new Vec2(double.Parse(strs[0]), double.Parse(strs[1]));
_model.Uvs.Add(vt);
}
else if (StartWith(line, "g"))
{
var gStr = line.Substring(1).Trim();
var g = new Geometry {
Id = gStr
};
_model.Geometries.Add(g);
}
else if (StartWith(line, "usemtl"))
{
var umtl = line.Substring(6).Trim();
var g = GetGeometry();
var face = new Face {
MatName = umtl
};
g.Faces.Add(face);
}
else if (StartWith(line, "f"))
{
var fStr = line.Substring(1).Trim();
var g = GetGeometry();
Face face = GetFace(g);
var strs = SplitLine(fStr);
if (strs.Length < 3)
{
continue; // ignore face that has less than 3 vertices
}
if (strs.Length == 3)
{
var v1 = GetVertex(strs[0]);
var v2 = GetVertex(strs[1]);
var v3 = GetVertex(strs[2]);
var f = new FaceTriangle(v1, v2, v3);
face.Triangles.Add(f);
}
else if (strs.Length == 4)
{
var v1 = GetVertex(strs[0]);
var v2 = GetVertex(strs[1]);
var v3 = GetVertex(strs[2]);
var f = new FaceTriangle(v1, v2, v3);
face.Triangles.Add(f);
var v4 = GetVertex(strs[3]);
var ff = new FaceTriangle(v1, v3, v4);
face.Triangles.Add(ff);
}
else //if (strs.Length > 4)
{
var points = new List <Vec3>();
for (var i = 0; i < strs.Length; i++)
{
var vv = GetVertex(strs[i]);
var p = _model.Vertices[vv.V - 1];
points.Add(p);
}
var planeAxis = GeomUtil.ComputeProjectTo2DArguments(points);
if (planeAxis != null)
{
var points2D = GeomUtil.CreateProjectPointsTo2DFunction(planeAxis, points);
var indices = PolygonPipeline.Triangulate(points2D, null);
if (indices.Length == 0)
{
// TODO:
}
for (var i = 0; i < indices.Length - 2; i += 3)
{
var vv1 = GetVertex(strs[indices[i]]);
var vv2 = GetVertex(strs[indices[i + 1]]);
var vv3 = GetVertex(strs[indices[i + 2]]);
var ff = new FaceTriangle(vv1, vv2, vv3);
face.Triangles.Add(ff);
}
}
else
{
// TODO:
}
}
}
else
{
//var strs = SplitLine(line);
}
}
if (!String.IsNullOrEmpty(_model.MatFilename))
{
var dir = Path.GetDirectoryName(_objFile);
var matFile = Path.Combine(dir, _model.MatFilename);
using (var mtlParser = new MtlParser(matFile, _encoding))
{
var mats = mtlParser.GetMats();
_model.Materials.AddRange(mats);
}
}
}
return(_model);
}