public static ObjFile FromStream(Stream stream)
{
if (stream == null)
{
throw new ArgumentNullException("stream");
}
var obj = new ObjFile();
var context = new ObjFileReaderContext(obj);
foreach (var values in LineReader.Read(stream))
{
switch (values[0].ToLowerInvariant())
{
case "v":
{
if (values.Length < 4)
{
throw new InvalidDataException("A v statement must specify at least 3 values.");
}
var v = new ObjVector4();
v.X = float.Parse(values[1], CultureInfo.InvariantCulture);
v.Y = float.Parse(values[2], CultureInfo.InvariantCulture);
v.Z = float.Parse(values[3], CultureInfo.InvariantCulture);
if (values.Length == 4)
{
v.W = 1.0f;
}
else if (values.Length == 5)
{
v.W = float.Parse(values[4], CultureInfo.InvariantCulture);
}
else
{
throw new InvalidDataException("A v statement has too many values.");
}
obj.Vertices.Add(v);
break;
}
case "vp":
{
if (values.Length < 2)
{
throw new InvalidDataException("A vp statement must specify at least 1 value.");
}
var v = new ObjVector3();
v.X = float.Parse(values[1], CultureInfo.InvariantCulture);
if (values.Length == 2)
{
v.Y = 0.0f;
v.Z = 1.0f;
}
else if (values.Length == 3)
{
v.Y = float.Parse(values[2], CultureInfo.InvariantCulture);
v.Z = 1.0f;
}
else if (values.Length == 4)
{
v.Y = float.Parse(values[2], CultureInfo.InvariantCulture);
v.Z = float.Parse(values[3], CultureInfo.InvariantCulture);
}
else
{
throw new InvalidDataException("A vp statement has too many values.");
}
obj.ParameterSpaceVertices.Add(v);
break;
}
case "vn":
{
if (values.Length < 4)
{
throw new InvalidDataException("A vn statement must specify 3 values.");
}
if (values.Length != 4)
{
throw new InvalidDataException("A vn statement has too many values.");
}
var v = new ObjVector3();
v.X = float.Parse(values[1], CultureInfo.InvariantCulture);
v.Y = float.Parse(values[2], CultureInfo.InvariantCulture);
v.Z = float.Parse(values[3], CultureInfo.InvariantCulture);
obj.VertexNormals.Add(v);
break;
}
case "vt":
{
if (values.Length < 2)
{
throw new InvalidDataException("A vt statement must specify at least 1 value.");
}
var v = new ObjVector3();
v.X = float.Parse(values[1], CultureInfo.InvariantCulture);
if (values.Length == 2)
{
v.Y = 0.0f;
v.Z = 0.0f;
}
else if (values.Length == 3)
{
v.Y = float.Parse(values[2], CultureInfo.InvariantCulture);
v.Z = 0.0f;
}
else if (values.Length == 4)
{
v.Y = float.Parse(values[2], CultureInfo.InvariantCulture);
v.Z = float.Parse(values[3], CultureInfo.InvariantCulture);
}
else
{
throw new InvalidDataException("A vt statement has too many values.");
}
obj.TextureVertices.Add(v);
break;
}
case "cstype":
ObjFileReader.ParseFreeFormType(context, values);
break;
case "deg":
if (values.Length < 2)
{
throw new InvalidDataException("A deg statement must specify at least 1 value.");
}
if (values.Length == 2)
{
context.DegreeU = int.Parse(values[1]);
context.DegreeV = 0;
}
else if (values.Length == 3)
{
context.DegreeU = int.Parse(values[1], CultureInfo.InvariantCulture);
context.DegreeV = int.Parse(values[2], CultureInfo.InvariantCulture);
}
else
{
throw new InvalidDataException("A deg statement has too many values.");
}
break;
case "bmat":
{
if (values.Length < 2)
{
throw new InvalidDataException("A bmat statement must specify a direction.");
}
int d;
if (string.Equals(values[1], "u", StringComparison.OrdinalIgnoreCase))
{
d = 1;
}
else if (string.Equals(values[1], "v", StringComparison.OrdinalIgnoreCase))
{
d = 2;
}
else
{
throw new InvalidDataException("A bmat statement has an unknown direction.");
}
int count = (context.DegreeU + 1) * (context.DegreeV + 1);
if (values.Length != count + 2)
{
throw new InvalidDataException("A bmat statement has too many or too few values.");
}
var matrix = new float[count];
for (int i = 0; i < count; i++)
{
matrix[i] = float.Parse(values[2 + i], CultureInfo.InvariantCulture);
}
switch (d)
{
case 1:
context.BasicMatrixU = matrix;
break;
case 2:
context.BasicMatrixV = matrix;
break;
}
break;
}
case "step":
if (values.Length < 2)
{
throw new InvalidDataException("A step statement must specify at least 1 value.");
}
if (values.Length == 2)
{
context.StepU = float.Parse(values[1], CultureInfo.InvariantCulture);
context.StepV = 1.0f;
}
else if (values.Length == 3)
{
context.StepU = float.Parse(values[1], CultureInfo.InvariantCulture);
context.StepV = float.Parse(values[2], CultureInfo.InvariantCulture);
}
else
{
throw new InvalidDataException("A step statement has too many values.");
}
break;
case "p":
{
if (values.Length < 2)
{
throw new InvalidDataException("A p statement must specify at least 1 value.");
}
var point = new ObjPoint();
for (int i = 1; i < values.Length; i++)
{
point.Vertices.Add(ObjFileReader.ParseTriplet(obj, values[i]));
}
context.ApplyAttributesToElement(point);
context.ApplyAttributesToPolygonalElement(point);
obj.Points.Add(point);
foreach (var group in context.GetCurrentGroups())
{
group.Points.Add(point);
}
break;
}
case "l":
{
if (values.Length < 3)
{
throw new InvalidDataException("A l statement must specify at least 2 values.");
}
var line = new ObjLine();
for (int i = 1; i < values.Length; i++)
{
line.Vertices.Add(ObjFileReader.ParseTriplet(obj, values[i]));
}
context.ApplyAttributesToElement(line);
context.ApplyAttributesToPolygonalElement(line);
obj.Lines.Add(line);
foreach (var group in context.GetCurrentGroups())
{
group.Lines.Add(line);
}
break;
}
case "f":
case "fo":
{
if (values.Length < 4)
{
throw new InvalidDataException("A f statement must specify at least 3 values.");
}
var face = new ObjFace();
for (int i = 1; i < values.Length; i++)
{
face.Vertices.Add(ObjFileReader.ParseTriplet(obj, values[i]));
}
context.ApplyAttributesToElement(face);
context.ApplyAttributesToPolygonalElement(face);
obj.Faces.Add(face);
foreach (var group in context.GetCurrentGroups())
{
group.Faces.Add(face);
}
break;
}
case "curv":
{
if (values.Length < 5)
{
throw new InvalidDataException("A curv statement must specify at least 4 values.");
}
var curve = new ObjCurve();
curve.StartParameter = float.Parse(values[1], CultureInfo.InvariantCulture);
curve.EndParameter = float.Parse(values[2], CultureInfo.InvariantCulture);
for (int i = 3; i < values.Length; i++)
{
int v = int.Parse(values[i], CultureInfo.InvariantCulture);
if (v == 0)
{
throw new InvalidDataException("A curv statement contains an invalid vertex index.");
}
if (v < 0)
{
v = obj.Vertices.Count + v + 1;
}
if (v <= 0 || v > obj.Vertices.Count)
{
throw new IndexOutOfRangeException();
}
curve.Vertices.Add(v);
}
context.ApplyAttributesToElement(curve);
context.ApplyAttributesToFreeFormElement(curve);
context.CurrentFreeFormElement = curve;
obj.Curves.Add(curve);
foreach (var group in context.GetCurrentGroups())
{
group.Curves.Add(curve);
}
break;
}
case "curv2":
{
if (values.Length < 3)
{
throw new InvalidDataException("A curv2 statement must specify at least 2 values.");
}
var curve = new ObjCurve2D();
for (int i = 1; i < values.Length; i++)
{
int vp = int.Parse(values[i], CultureInfo.InvariantCulture);
if (vp == 0)
{
throw new InvalidDataException("A curv2 statement contains an invalid parameter space vertex index.");
}
if (vp < 0)
{
vp = obj.ParameterSpaceVertices.Count + vp + 1;
}
if (vp <= 0 || vp > obj.ParameterSpaceVertices.Count)
{
throw new IndexOutOfRangeException();
}
curve.ParameterSpaceVertices.Add(vp);
}
context.ApplyAttributesToElement(curve);
context.ApplyAttributesToFreeFormElement(curve);
context.CurrentFreeFormElement = curve;
obj.Curves2D.Add(curve);
foreach (var group in context.GetCurrentGroups())
{
group.Curves2D.Add(curve);
}
break;
}
case "surf":
{
if (values.Length < 6)
{
throw new InvalidDataException("A surf statement must specify at least 5 values.");
}
var surface = new ObjSurface();
surface.StartParameterU = float.Parse(values[1], CultureInfo.InvariantCulture);
surface.EndParameterU = float.Parse(values[2], CultureInfo.InvariantCulture);
surface.StartParameterV = float.Parse(values[3], CultureInfo.InvariantCulture);
surface.EndParameterV = float.Parse(values[4], CultureInfo.InvariantCulture);
for (int i = 5; i < values.Length; i++)
{
surface.Vertices.Add(ObjFileReader.ParseTriplet(obj, values[i]));
}
context.ApplyAttributesToElement(surface);
context.ApplyAttributesToFreeFormElement(surface);
context.CurrentFreeFormElement = surface;
obj.Surfaces.Add(surface);
foreach (var group in context.GetCurrentGroups())
{
group.Surfaces.Add(surface);
}
break;
}
case "parm":
if (context.CurrentFreeFormElement == null)
{
break;
}
if (values.Length < 4)
{
throw new InvalidDataException("A parm statement must specify at least 3 values.");
}
IList <float> parameters;
if (string.Equals(values[1], "u", StringComparison.OrdinalIgnoreCase))
{
parameters = context.CurrentFreeFormElement.ParametersU;
}
else if (string.Equals(values[1], "v", StringComparison.OrdinalIgnoreCase))
{
parameters = context.CurrentFreeFormElement.ParametersV;
}
else
{
throw new InvalidDataException("A parm statement has an unknown direction.");
}
for (int i = 2; i < values.Length; i++)
{
parameters.Add(float.Parse(values[i], CultureInfo.InvariantCulture));
}
break;
case "trim":
if (context.CurrentFreeFormElement == null)
{
break;
}
ObjFileReader.ParseCurveIndex(context.CurrentFreeFormElement.OuterTrimmingCurves, obj, values);
break;
case "hole":
if (context.CurrentFreeFormElement == null)
{
break;
}
ObjFileReader.ParseCurveIndex(context.CurrentFreeFormElement.InnerTrimmingCurves, obj, values);
break;
case "scrv":
if (context.CurrentFreeFormElement == null)
{
break;
}
ObjFileReader.ParseCurveIndex(context.CurrentFreeFormElement.SequenceCurves, obj, values);
break;
case "sp":
if (context.CurrentFreeFormElement == null)
{
break;
}
if (values.Length < 2)
{
throw new InvalidDataException("A sp statement must specify at least 1 value.");
}
for (int i = 1; i < values.Length; i++)
{
int vp = int.Parse(values[i], CultureInfo.InvariantCulture);
if (vp == 0)
{
throw new InvalidDataException("A sp statement contains an invalid parameter space vertex index.");
}
if (vp < 0)
{
vp = obj.ParameterSpaceVertices.Count + vp + 1;
}
if (vp <= 0 || vp > obj.ParameterSpaceVertices.Count)
{
throw new IndexOutOfRangeException();
}
context.CurrentFreeFormElement.SpecialPoints.Add(vp);
}
break;
case "end":
context.CurrentFreeFormElement = null;
break;
case "con":
ObjFileReader.ParseSurfaceConnection(obj, values);
break;
case "g":
ObjFileReader.ParseGroupName(values, context);
break;
case "s":
if (values.Length < 2)
{
throw new InvalidDataException("A s statement must specify a value.");
}
if (values.Length != 2)
{
throw new InvalidDataException("A s statement has too many values.");
}
if (string.Equals(values[1], "off", StringComparison.OrdinalIgnoreCase))
{
context.SmoothingGroupNumber = 0;
}
else
{
context.SmoothingGroupNumber = int.Parse(values[1], CultureInfo.InvariantCulture);
}
break;
case "mg":
if (values.Length < 2)
{
throw new InvalidDataException("A mg statement must specify a value.");
}
if (string.Equals(values[1], "off", StringComparison.OrdinalIgnoreCase))
{
context.MergingGroupNumber = 0;
}
else
{
context.MergingGroupNumber = int.Parse(values[1], CultureInfo.InvariantCulture);
}
if (context.MergingGroupNumber == 0)
{
if (values.Length > 3)
{
throw new InvalidDataException("A mg statement has too many values.");
}
}
else
{
if (values.Length != 3)
{
throw new InvalidDataException("A mg statement has too many or too few values.");
}
float res = float.Parse(values[2], CultureInfo.InvariantCulture);
obj.MergingGroupResolutions[context.MergingGroupNumber] = res;
}
break;
case "o":
if (values.Length == 1)
{
context.ObjectName = null;
break;
}
if (values.Length != 2)
{
throw new InvalidDataException("A o statement has too many values.");
}
context.ObjectName = values[1];
break;
case "bevel":
if (values.Length < 2)
{
throw new InvalidDataException("A bevel statement must specify a name.");
}
if (values.Length != 2)
{
throw new InvalidDataException("A bevel statement has too many values.");
}
if (string.Equals(values[1], "on", StringComparison.OrdinalIgnoreCase))
{
context.IsBevelInterpolationEnabled = true;
}
else if (string.Equals(values[1], "off", StringComparison.OrdinalIgnoreCase))
{
context.IsBevelInterpolationEnabled = false;
}
else
{
throw new InvalidDataException("A bevel statement must specify on or off.");
}
break;
case "c_interp":
if (values.Length < 2)
{
throw new InvalidDataException("A c_interp statement must specify a name.");
}
if (values.Length != 2)
{
throw new InvalidDataException("A c_interp statement has too many values.");
}
if (string.Equals(values[1], "on", StringComparison.OrdinalIgnoreCase))
{
context.IsColorInterpolationEnabled = true;
}
else if (string.Equals(values[1], "off", StringComparison.OrdinalIgnoreCase))
{
context.IsColorInterpolationEnabled = false;
}
else
{
throw new InvalidDataException("A c_interp statement must specify on or off.");
}
break;
case "d_interp":
if (values.Length < 2)
{
throw new InvalidDataException("A d_interp statement must specify a name.");
}
if (values.Length != 2)
{
throw new InvalidDataException("A d_interp statement has too many values.");
}
if (string.Equals(values[1], "on", StringComparison.OrdinalIgnoreCase))
{
context.IsDissolveInterpolationEnabled = true;
}
else if (string.Equals(values[1], "off", StringComparison.OrdinalIgnoreCase))
{
context.IsDissolveInterpolationEnabled = false;
}
else
{
throw new InvalidDataException("A d_interp statement must specify on or off.");
}
break;
case "lod":
if (values.Length < 2)
{
throw new InvalidDataException("A lod statement must specify a value.");
}
if (values.Length != 2)
{
throw new InvalidDataException("A lod statement has too many values.");
}
context.LevelOfDetail = int.Parse(values[1], CultureInfo.InvariantCulture);
break;
case "maplib":
if (values.Length < 2)
{
throw new InvalidDataException("A maplib statement must specify a file name.");
}
for (int i = 1; i < values.Length; i++)
{
if (!Path.HasExtension(values[i]))
{
throw new InvalidDataException("A file name must have an extension.");
}
obj.MapLibraries.Add(values[i]);
}
break;
case "mtllib":
if (values.Length < 2)
{
throw new InvalidDataException("A mtllib statement must specify a file name.");
}
for (int i = 1; i < values.Length; i++)
{
if (!Path.HasExtension(values[i]))
{
throw new InvalidDataException("A file name must have an extension.");
}
obj.MaterialLibraries.Add(values[i]);
}
break;
case "usemap":
if (values.Length < 2)
{
throw new InvalidDataException("A usemap statement must specify a value.");
}
if (values.Length != 2)
{
throw new InvalidDataException("A usemap statement has too many values.");
}
if (string.Equals(values[1], "off", StringComparison.OrdinalIgnoreCase))
{
context.MapName = null;
}
else
{
context.MapName = values[1];
}
break;
case "usemtl":
if (values.Length < 2)
{
throw new InvalidDataException("A usemtl statement must specify a value.");
}
if (values.Length != 2)
{
throw new InvalidDataException("A usemtl statement has too many values.");
}
if (string.Equals(values[1], "off", StringComparison.OrdinalIgnoreCase))
{
context.MaterialName = null;
}
else
{
context.MaterialName = values[1];
}
break;
case "shadow_obj":
if (values.Length < 2)
{
throw new InvalidDataException("A shadow_obj statement must specify a file name.");
}
if (values.Length != 2)
{
throw new InvalidDataException("A shadow_obj statement has too many values.");
}
if (!Path.HasExtension(values[1]))
{
throw new InvalidDataException("A file name must have an extension.");
}
obj.ShadowObjectFileName = values[1];
break;
case "trace_obj":
if (values.Length < 2)
{
throw new InvalidDataException("A trace_obj statement must specify a file name.");
}
if (values.Length != 2)
{
throw new InvalidDataException("A trace_obj statement has too many values.");
}
if (!Path.HasExtension(values[1]))
{
throw new InvalidDataException("A file name must have an extension.");
}
obj.TraceObjectFileName = values[1];
break;
case "ctech":
context.CurveApproximationTechnique = ObjFileReader.ParseApproximationTechnique(values);
break;
case "stech":
context.SurfaceApproximationTechnique = ObjFileReader.ParseApproximationTechnique(values);
break;
case "bsp":
case "bzp":
case "cdc":
case "cdp":
case "res":
throw new NotImplementedException(string.Concat(values[0], " statement have been replaced by free-form geometry statements."));
}
}
return(obj);
}