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);
}
}