public void CompactFaceGroups()
{
var groups = new List <ObjFaceGroup>(this.FaceGroups.Count);
foreach (var faceGroup in this.FaceGroups)
{
ObjFaceGroup index = null;
foreach (var group in groups)
{
if (group.MaterialName == faceGroup.MaterialName)
{
index = group;
break;
}
}
if (index == null)
{
groups.Add(faceGroup);
}
else
{
foreach (var face in faceGroup.Faces)
{
index.Faces.Add(face);
}
}
}
groups.TrimExcess();
this.FaceGroups = groups;
}
public void SplitFaceGroups()
{
this.CompactFaceGroups();
Func <ObjIndex, int[]> indices = index =>
index.D < 0 ?
new[] { index.A, index.B, index.C } :
new[] { index.A, index.B, index.C, index.D };
var faceGroups = new List <ObjFaceGroup>();
foreach (var faceGroup in this.FaceGroups)
{
var groups = new List <ObjFaceGroup>();
foreach (var face in faceGroup.Faces)
{
var faceIndices = indices(face.VerticesIndex);
var group = groups
.Where(g => g.Faces.SelectMany(t => indices(t.VerticesIndex)).Any(t => faceIndices.Contains(t)))
.FirstOrDefault();
if (group != null)
{
group.Faces.Add(face);
}
else
{
group = new ObjFaceGroup();
group.MaterialName = faceGroup.MaterialName;
group.Faces.Add(face);
groups.Add(group);
}
}
faceGroups.AddRange(groups);
}
this.FaceGroups = faceGroups;
}
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 void OptToObj(OptFile opt, string objPath, bool scale)
{
if (opt == null)
{
throw new ArgumentNullException("opt");
}
string objDirectory = Path.GetDirectoryName(objPath);
string objName = Path.GetFileNameWithoutExtension(objPath);
var objMaterials = new ObjMaterialDictionary();
foreach (var texture in opt.Textures.Values)
{
var material = new ObjMaterial
{
Name = texture.Name,
DiffuseMapFileName = string.Format(CultureInfo.InvariantCulture, "{0}.png", texture.Name)
};
texture.Save(Path.Combine(objDirectory, material.DiffuseMapFileName));
if (texture.HasAlpha)
{
material.AlphaMapFileName = string.Format(CultureInfo.InvariantCulture, "{0}_alpha.png", texture.Name);
texture.SaveAlphaMap(Path.Combine(objDirectory, material.AlphaMapFileName));
}
objMaterials.Add(texture.Name, material);
}
objMaterials.Save(Path.ChangeExtension(objPath, "mtl"));
var distances = opt.Meshes
.SelectMany(t => t.Lods)
.Select(t => t.Distance)
.Distinct()
.OrderByDescending(t => t)
.ToArray();
for (int distance = 0; distance < distances.Length; distance++)
{
var obj = new ObjFile();
int objectsIndex = 0;
int verticesIndex = 0;
int verticesTexIndex = 0;
int verticesNormalIndex = 0;
foreach (var mesh in opt.Meshes)
{
var lod = mesh.Lods.FirstOrDefault(t => t.Distance <= distances[distance]);
if (lod == null)
{
continue;
}
var objMesh = new ObjMesh(string.Format(CultureInfo.InvariantCulture, "{0}.{1:D3}", mesh.Descriptor.MeshType, objectsIndex));
obj.Meshes.Add(objMesh);
objectsIndex++;
if (scale)
{
foreach (var v in mesh.Vertices)
{
obj.Vertices.Add(new ObjVector3(v.X * OptFile.ScaleFactor, v.Z * OptFile.ScaleFactor, v.Y * OptFile.ScaleFactor));
}
}
else
{
foreach (var v in mesh.Vertices)
{
obj.Vertices.Add(new ObjVector3(v.X, v.Z, v.Y));
}
}
foreach (var v in mesh.TextureCoordinates)
{
obj.VertexTexCoords.Add(new ObjVector2(v.U, -v.V));
}
foreach (var v in mesh.VertexNormals)
{
obj.VertexNormals.Add(new ObjVector3(v.X, v.Z, v.Y));
}
foreach (var faceGroup in lod.FaceGroups)
{
var objFaceGroup = new ObjFaceGroup();
if (faceGroup.Textures.Count > 0)
{
objFaceGroup.MaterialName = faceGroup.Textures[0];
}
objMesh.FaceGroups.Add(objFaceGroup);
foreach (var face in faceGroup.Faces)
{
if (face.VerticesIndex.D < 0)
{
objFaceGroup.Faces.Add(new ObjFace()
{
VerticesIndex = new ObjIndex(
verticesIndex + face.VerticesIndex.A,
verticesIndex + face.VerticesIndex.B,
verticesIndex + face.VerticesIndex.C
),
VertexTexCoordsIndex = new ObjIndex(
verticesTexIndex + face.TextureCoordinatesIndex.A,
verticesTexIndex + face.TextureCoordinatesIndex.B,
verticesTexIndex + face.TextureCoordinatesIndex.C),
VertexNormalsIndex = new ObjIndex(
verticesNormalIndex + face.VertexNormalsIndex.A,
verticesNormalIndex + face.VertexNormalsIndex.B,
verticesNormalIndex + face.VertexNormalsIndex.C)
});
}
else
{
objFaceGroup.Faces.Add(new ObjFace()
{
VerticesIndex = new ObjIndex(
verticesIndex + face.VerticesIndex.A,
verticesIndex + face.VerticesIndex.B,
verticesIndex + face.VerticesIndex.C,
verticesIndex + face.VerticesIndex.D
),
VertexTexCoordsIndex = new ObjIndex(
verticesTexIndex + face.TextureCoordinatesIndex.A,
verticesTexIndex + face.TextureCoordinatesIndex.B,
verticesTexIndex + face.TextureCoordinatesIndex.C,
verticesTexIndex + face.TextureCoordinatesIndex.D),
VertexNormalsIndex = new ObjIndex(
verticesNormalIndex + face.VertexNormalsIndex.A,
verticesNormalIndex + face.VertexNormalsIndex.B,
verticesNormalIndex + face.VertexNormalsIndex.C,
verticesNormalIndex + face.VertexNormalsIndex.D)
});
}
}
}
verticesIndex += mesh.Vertices.Count;
verticesTexIndex += mesh.TextureCoordinates.Count;
verticesNormalIndex += mesh.VertexNormals.Count;
}
obj.Save(Path.Combine(objDirectory, string.Format(CultureInfo.InvariantCulture, "{0}_{1}.obj", objName, distance)), objName);
}
}
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 void SplitFaceGroups()
{
this.CompactFaceGroups();
Func<ObjIndex, int[]> indices = index =>
index.D < 0 ?
new[] { index.A, index.B, index.C } :
new[] { index.A, index.B, index.C, index.D };
var faceGroups = new List<ObjFaceGroup>();
foreach (var faceGroup in this.FaceGroups)
{
var groups = new List<ObjFaceGroup>();
foreach (var face in faceGroup.Faces)
{
var faceIndices = indices(face.VerticesIndex);
var group = groups
.Where(g => g.Faces.SelectMany(t => indices(t.VerticesIndex)).Any(t => faceIndices.Contains(t)))
.FirstOrDefault();
if (group != null)
{
group.Faces.Add(face);
}
else
{
group = new ObjFaceGroup();
group.MaterialName = faceGroup.MaterialName;
group.Faces.Add(face);
groups.Add(group);
}
}
faceGroups.AddRange(groups);
}
this.FaceGroups = faceGroups;
}
