/// <summary>
/// This function loads in the model objects from the filename provided
/// </summary>
/// <param name="filename">The filename of the object</param>
/// <returns>obj - The object after being loaded in</returns>
public static ObjVolume LoadFromFile(string filename)
{
// This creates a new object and proceeds to set it's verticies, indicies, etc based on the data from the file loaded
ObjVolume obj = new ObjVolume();
try
{
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);
}
catch (Exception e)
{
Console.WriteLine("Error loading file: {0}", filename);
}
return obj;
}
/// <summary>
/// This function loads in all the data of the object that was read from the file
/// </summary>
/// <param name="obj">The object created previously in string form</param>
/// <returns></returns>
public static ObjVolume LoadFromString(string obj)
{
// Seperate lines from the file
List<String> lines = new List<string>(obj.Split('\n'));
// These lists hold the 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>>();
foreach (String line in lines)
{
if (line.StartsWith("v ")) // Vertex
{
// 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], out vec.X);
success |= float.TryParse(vertparts[1], out vec.Y);
success |= float.TryParse(vertparts[2], out vec.Z);
// Dummy color/texture coordinates (Not using colour and texture coordinates from the file)
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 (!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], out i1);
success |= int.TryParse(faceparts[1], out i2);
success |= int.TryParse(faceparts[2], out i3);
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
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;
}
