/// <summary>
/// Loads a .obj file from its filename (path).
/// </summary>
/// <param name="filename">The name (path) of the file.</param>
/// <returns>Returns parsed data as an usable ObjVolume object.</returns>
public static ObjVolume LoadFromFile(string filename)
{
ObjVolume obj = new ObjVolume();
try
{
// Extract the content of the file and send it to the parser.
using (StreamReader reader = new StreamReader(new FileStream(filename, FileMode.Open, FileAccess.Read)))
{
obj = LoadFromString(reader.ReadToEnd());
}
}
catch (FileNotFoundException e)
{
Console.WriteLine("File not found: {0}", filename);
Console.WriteLine(e.ToString());
}
catch (Exception e)
{
Console.WriteLine("Error loading file: {0}", filename);
Console.WriteLine(e.ToString());
}
return(obj);
}
/// <summary>
/// Loads a .obj file from its content. Called by LoadFromFile.
/// </summary>
/// <param name="obj">The content of the .obj file.</param>
/// <returns>Returns parsed data as an usable ObjVoume object.</returns>
protected static ObjVolume LoadFromString(string obj)
{
// Constants used for parsing
NumberStyles style = NumberStyles.Float;
CultureInfo culture = CultureInfo.InvariantCulture;
// Seperate lines from the file
List <String> lines = new List <string>(obj.Split('\n'));
// Lists to hold model data
List <Vector3> verts = new List <Vector3>();
List <Vector3> colors = new List <Vector3>();
List <Vector2> texs = new List <Vector2>();
List <Tuple <int, int, int> > faces = new List <Tuple <int, int, int> >();
// Read file line by line
foreach (String line in lines)
{
if (line.StartsWith("v ")) // Vertex definition
{
// Cut off beginning of line
String temp = line.Substring(2);
Vector3 vec = new Vector3();
if (temp.Count((char c) => c == ' ') == 2) // Check if there's enough elements for a vertex
{
String[] vertparts = temp.Split(' ');
// Attempt to parse each part of the vertice
bool success = float.TryParse(vertparts[0], style, culture, out vec.X);
success |= float.TryParse(vertparts[1], style, culture, out vec.Y);
success |= float.TryParse(vertparts[2], style, culture, out vec.Z);
// Dummy color/texture coordinates for now
colors.Add(new Vector3((float)Math.Sin(vec.Z), (float)Math.Sin(vec.Z), (float)Math.Sin(vec.Z)));
texs.Add(new Vector2((float)Math.Sin(vec.Z), (float)Math.Sin(vec.Z)));
// If any of the parses failed, report the error
if (!success)
{
Console.WriteLine("Error parsing vertex: {0}", line);
}
}
verts.Add(vec);
}
else if (line.StartsWith("f ")) // Face definition
{
// Cut off beginning of line
String temp = line.Substring(2);
Tuple <int, int, int> face = new Tuple <int, int, int>(0, 0, 0);
if (temp.Count((char c) => c == ' ') == 2) // Check if there's enough elements for a face
{
String[] faceparts = temp.Split(' ');
int i1, i2, i3;
// Attempt to parse each part of the face
bool success = int.TryParse(faceparts[0], style, culture, out i1);
success |= int.TryParse(faceparts[1], style, culture, out i2);
success |= int.TryParse(faceparts[2], style, culture, out i3);
// If any of the parses failed, report the error
if (!success)
{
Console.WriteLine("Error parsing face: {0}", line);
}
else
{
// Decrement to get zero-based vertex numbers
face = new Tuple <int, int, int>(i1 - 1, i2 - 1, i3 - 1);
faces.Add(face);
}
}
}
}
// Create the ObjVolume object
ObjVolume vol = new ObjVolume();
vol.vertices = verts.ToArray();
vol.faces = new List <Tuple <int, int, int> >(faces);
vol.colors = colors.ToArray();
vol.texturecoords = texs.ToArray();
return(vol);
}
