public static ObjFile FromFile(string fileName)
{
ObjFile obj = new ObjFile();
obj.FileName = fileName;
using (StreamReader file = new StreamReader(fileName))
{
string line;
string materialName = null;
ObjMesh mesh = new ObjMesh("unnamed");
obj.Meshes.Add(mesh);
ObjFaceGroup faceGroup = new ObjFaceGroup();
mesh.FaceGroups.Add(faceGroup);
while ((line = file.ReadLine()) != null)
{
if (string.IsNullOrWhiteSpace(line))
{
continue;
}
line = line.Trim();
if (line.StartsWith("#", StringComparison.OrdinalIgnoreCase))
{
continue;
}
string[] values = line.Split(new[] { ' ', '\t' }, StringSplitOptions.RemoveEmptyEntries);
switch (values[0].ToUpperInvariant())
{
case "MTLLIB":
if (values.Length != 2)
{
throw new InvalidDataException("missing mtllib name");
}
if (obj.Materials.Count > 0)
{
throw new InvalidDataException("multiple mtllib");
}
obj.Materials = ObjMaterialDictionary.FromFile(Path.Combine(Path.GetDirectoryName(fileName), values[1]));
break;
case "V":
if (values.Length < 4)
{
throw new InvalidDataException("v must be x y z");
}
obj.Vertices.Add(new ObjVector3(
float.Parse(values[1], CultureInfo.InvariantCulture),
float.Parse(values[2], CultureInfo.InvariantCulture),
float.Parse(values[3], CultureInfo.InvariantCulture)));
break;
case "VT":
if (values.Length < 3)
{
throw new InvalidDataException("vt must be u v");
}
obj.VertexTexCoords.Add(new ObjVector2(
float.Parse(values[1], CultureInfo.InvariantCulture),
float.Parse(values[2], CultureInfo.InvariantCulture)));
break;
case "VN":
if (values.Length < 4)
{
throw new InvalidDataException("vn must be x y z");
}
obj.VertexNormals.Add(new ObjVector3(
float.Parse(values[1], CultureInfo.InvariantCulture),
float.Parse(values[2], CultureInfo.InvariantCulture),
float.Parse(values[3], CultureInfo.InvariantCulture)));
break;
case "O":
case "G":
if (values.Length < 2)
{
throw new InvalidDataException("missing object name");
}
if (faceGroup.Faces.Count == 0)
{
mesh.Name = values[1];
}
else
{
mesh = new ObjMesh(values[1]);
obj.Meshes.Add(mesh);
faceGroup = new ObjFaceGroup();
faceGroup.MaterialName = materialName;
mesh.FaceGroups.Add(faceGroup);
}
break;
case "USEMTL":
if (values.Length != 2)
{
throw new InvalidDataException("missing material name");
}
materialName = values[1];
if (faceGroup.Faces.Count == 0)
{
faceGroup.MaterialName = materialName;
}
else
{
faceGroup = new ObjFaceGroup();
faceGroup.MaterialName = materialName;
mesh.FaceGroups.Add(faceGroup);
}
break;
case "F":
if (values.Length == 4)
{
var v1 = ParseFaceVertex(values[1]);
var v2 = ParseFaceVertex(values[2]);
var v3 = ParseFaceVertex(values[3]);
var face = new ObjFace();
face.VerticesIndex = new ObjIndex(v1.Item1, v2.Item1, v3.Item1);
face.VertexTexCoordsIndex = new ObjIndex(v1.Item2, v2.Item2, v3.Item2);
face.VertexNormalsIndex = new ObjIndex(v1.Item3, v2.Item3, v3.Item3);
faceGroup.Faces.Add(face);
}
else if (values.Length == 5)
{
var v1 = ParseFaceVertex(values[1]);
var v2 = ParseFaceVertex(values[2]);
var v3 = ParseFaceVertex(values[3]);
var v4 = ParseFaceVertex(values[4]);
var face = new ObjFace();
face.VerticesIndex = new ObjIndex(v1.Item1, v2.Item1, v3.Item1, v4.Item1);
face.VertexTexCoordsIndex = new ObjIndex(v1.Item2, v2.Item2, v3.Item2, v4.Item2);
face.VertexNormalsIndex = new ObjIndex(v1.Item3, v2.Item3, v3.Item3, v4.Item3);
faceGroup.Faces.Add(face);
}
else
{
throw new InvalidDataException("invalid face");
}
break;
}
}
}
return(obj);
}
public static ObjFile FromFile(string fileName)
{
ObjFile obj = new ObjFile();
obj.FileName = fileName;
using (StreamReader file = new StreamReader(fileName))
{
string line;
string materialName = null;
ObjMesh mesh = new ObjMesh("unnamed");
obj.Meshes.Add(mesh);
ObjFaceGroup faceGroup = new ObjFaceGroup();
mesh.FaceGroups.Add(faceGroup);
while ((line = file.ReadLine()) != null)
{
if (string.IsNullOrWhiteSpace(line))
{
continue;
}
line = line.Trim();
if (line.StartsWith("#", StringComparison.OrdinalIgnoreCase))
{
continue;
}
string[] values = line.Split(new[] { ' ', '\t' }, StringSplitOptions.RemoveEmptyEntries);
switch (values[0].ToUpperInvariant())
{
case "MTLLIB":
if (values.Length != 2)
{
throw new InvalidDataException("missing mtllib name");
}
if (obj.Materials.Count > 0)
{
throw new InvalidDataException("multiple mtllib");
}
obj.Materials = ObjMaterialDictionary.FromFile(Path.Combine(Path.GetDirectoryName(fileName), values[1]));
break;
case "V":
if (values.Length < 4)
{
throw new InvalidDataException("v must be x y z");
}
obj.Vertices.Add(new ObjVector3(
float.Parse(values[1], CultureInfo.InvariantCulture),
float.Parse(values[2], CultureInfo.InvariantCulture),
float.Parse(values[3], CultureInfo.InvariantCulture)));
break;
case "VT":
if (values.Length < 3)
{
throw new InvalidDataException("vt must be u v");
}
obj.VertexTexCoords.Add(new ObjVector2(
float.Parse(values[1], CultureInfo.InvariantCulture),
float.Parse(values[2], CultureInfo.InvariantCulture)));
break;
case "VN":
if (values.Length < 4)
{
throw new InvalidDataException("vn must be x y z");
}
obj.VertexNormals.Add(new ObjVector3(
float.Parse(values[1], CultureInfo.InvariantCulture),
float.Parse(values[2], CultureInfo.InvariantCulture),
float.Parse(values[3], CultureInfo.InvariantCulture)));
break;
case "O":
case "G":
if (values.Length < 2)
{
throw new InvalidDataException("missing object name");
}
if (faceGroup.Faces.Count == 0)
{
mesh.Name = values[1];
}
else
{
mesh = new ObjMesh(values[1]);
obj.Meshes.Add(mesh);
faceGroup = new ObjFaceGroup();
faceGroup.MaterialName = materialName;
mesh.FaceGroups.Add(faceGroup);
}
break;
case "USEMTL":
if (values.Length != 2)
{
throw new InvalidDataException("missing material name");
}
materialName = values[1];
if (faceGroup.Faces.Count == 0)
{
faceGroup.MaterialName = materialName;
}
else
{
faceGroup = new ObjFaceGroup();
faceGroup.MaterialName = materialName;
mesh.FaceGroups.Add(faceGroup);
}
break;
case "F":
if (values.Length == 4)
{
var v1 = ParseFaceVertex(values[1]);
var v2 = ParseFaceVertex(values[2]);
var v3 = ParseFaceVertex(values[3]);
var face = new ObjFace();
face.VerticesIndex = new ObjIndex(v1.Item1, v2.Item1, v3.Item1);
face.VertexTexCoordsIndex = new ObjIndex(v1.Item2, v2.Item2, v3.Item2);
face.VertexNormalsIndex = new ObjIndex(v1.Item3, v2.Item3, v3.Item3);
faceGroup.Faces.Add(face);
}
else if (values.Length == 5)
{
var v1 = ParseFaceVertex(values[1]);
var v2 = ParseFaceVertex(values[2]);
var v3 = ParseFaceVertex(values[3]);
var v4 = ParseFaceVertex(values[4]);
var face = new ObjFace();
face.VerticesIndex = new ObjIndex(v1.Item1, v2.Item1, v3.Item1, v4.Item1);
face.VertexTexCoordsIndex = new ObjIndex(v1.Item2, v2.Item2, v3.Item2, v4.Item2);
face.VertexNormalsIndex = new ObjIndex(v1.Item3, v2.Item3, v3.Item3, v4.Item3);
faceGroup.Faces.Add(face);
}
else
{
throw new InvalidDataException("invalid face");
}
break;
}
}
}
return obj;
}
