private static MtlColor ParseColor(IList <string> args)
{
if (args.Count == 0)
{
throw new ArgumentException("not enough argments", nameof(args));
}
args = TextParser.ParseArgs(args);
switch (args[0])
{
case "xyz":
if (args.Count == 2)
{
return(new ColorXyz(float.Parse(args[1])));
}
if (args.Count >= 4)
{
return(new ColorXyz(float.Parse(args[1]), float.Parse(args[2]), float.Parse(args[3])));
}
throw new ArgumentException("not enough argments, need 2 or 4", nameof(args));
case "spectral":
if (args.Count == 2)
{
return(new ColorSpectral(args[1]));
}
if (args.Count >= 3)
{
return(new ColorSpectral(args[1], float.Parse(args[2])));
}
throw new ArgumentException("not enough argments, need 2 or 3", nameof(args));
default:
if (args.Count == 1)
{
return(new ColorRgb(float.Parse(args[0])));
}
if (args.Count == 3)
{
return(new ColorRgb(float.Parse(args[0]), float.Parse(args[1]), float.Parse(args[2])));
}
throw new ArgumentException("not enough argments, need 1 or 3", nameof(args));
}
}
/// <summary>
///
/// </summary>
/// <param name="inputFile"></param>
/// <param name="encoding">default utf-8</param>
/// <returns></returns>
public static ObjModel Parse(string inputFile, Encoding encoding = null)
{
encoding = encoding ?? TextParser.DefaultEncoding;
// https://stackoverflow.com/questions/2161895/reading-large-text-files-with-streams-in-c-sharp
using (var fs = new FileStream(inputFile, FileMode.Open, FileAccess.Read, FileShare.Read))
using (var bs = new BufferedStream(fs))
using (var sr = new StreamReader(bs, encoding))
{
var nameBuilder = new StringBuilder();
var model = new ObjModel();
var groupBuilder = model.GetMapBuilder("default");
var objectBuilder = model.GetMapBuilder("default");
var meshBuilder = model.GetMapBuilder("");
TextParser.Lex(sr, (key, args) =>
{
switch (key)
{
case "mtllib":
model.MaterialLibaries.AddRange(args);
break;
case "v":
args = TextParser.ParseArgs(args);
model.Positions.Add(ParsePoint(args));
break;
case "vt":
args = TextParser.ParseArgs(args);
model.TextureCoords.Add(ParseUv(args));
break;
case "vn":
args = TextParser.ParseArgs(args);
model.Normals.Add(ParseNormal(args));
break;
case "vp":
break;
case "p":
args = TextParser.ParseArgs(args);
foreach (var a in args)
{
var index = FindIndex(model.Positions, a);
model.Points.Add(index);
}
break;
case "l":
args = TextParser.ParseArgs(args);
FillLineSegments(model, args);
break;
case "fo":
case "f":
args = TextParser.ParseArgs(args);
FillPolygon(model, args);
break;
case "g":
args = TextParser.ParseArgs(args);
groupBuilder.Start(args[0]);
break;
case "o":
args = TextParser.ParseArgs(args);
objectBuilder.Start(args[0]);
if (String.IsNullOrEmpty(model.Name))
{
model.Name = args[0];
}
break;
case "usemtl":
meshBuilder.Start(args[0]);
break;
}
});
objectBuilder.End();
groupBuilder.End();
meshBuilder.End();
model.Objects = objectBuilder.Result;
model.Groups = groupBuilder.Result;
model.Meshes = meshBuilder.Result;
return(model);
}
}
