// ---- METHODS (PUBLIC) -------------------------------------------------------------------------------------
/// <summary>
/// Creates a generic model which can be exported into a .obj file format.
/// </summary>
/// <returns></returns>
public ObjModel CreateGenericModel()
{
ObjModel objModel = new ObjModel();
Dictionary <string, ObjMesh> meshes = new Dictionary <string, ObjMesh>();
bool spltByMaterial = true;
foreach (KCLModel model in Models)
{
//Distinct check. Some cases prisims have a unique ID
//Only split when they don't each have their own.
var distinctPrisms = model.Prisms
.GroupBy(p => p.CollisionFlags)
.Select(g => g.First())
.ToList().Count;
if (distinctPrisms == model.Prisms.Length)
{
spltByMaterial = false;
}
}
var mesh = new ObjMesh($"Mesh");
if (!spltByMaterial)
{
objModel.Meshes.Add(mesh);
}
foreach (KCLModel model in Models)
{
foreach (var face in model.Prisms)
{
var triangle = model.GetTriangle(face);
var normal = triangle.Normal;
if (triangle.HasNan())
{
continue;
}
ObjFace objFace = new ObjFace();
objFace.Material = $"COL_{face.CollisionFlags.ToString("X")}";
objFace.Vertices = new ObjVertex[3];
for (int i = 0; i < 3; i++)
{
objFace.Vertices[i] = new ObjVertex()
{
Position = triangle.Vertices[i],
Normal = normal,
};
}
if (spltByMaterial)
{
if (!meshes.ContainsKey(objFace.Material))
{
meshes.Add(objFace.Material, new ObjMesh(objFace.Material));
objModel.Meshes.Add(meshes[objFace.Material]);
}
meshes[objFace.Material].Faces.Add(objFace);
}
else
{
mesh.Faces.Add(objFace);
}
}
}
return(objModel);
}
/// <summary>
/// Loads the object file data from the given <paramref name="stream"/>.
/// </summary>
/// <param name="stream">The <see cref="Stream"/> to load the data from.</param>
/// <param name="leaveOpen"><c>true</c> to leave <paramref name="stream"/> open after loading the instance.
/// </param>
public void Load(Stream stream)
{
DebugLogger.WriteLine($"Loading obj file....");
Meshes = new List <ObjMesh>();
Materials = new List <ObjMaterial>();
ObjMesh currentMesh = new ObjMesh("Mesh");
HashSet <string> faceHashes = new HashSet <string>();
Dictionary <ObjFace, int> faceDupes = new Dictionary <ObjFace, int>();
using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
{
List <Vector3> Positions = new List <Vector3>();
List <Vector2> TexCoords = new List <Vector2>();
List <Vector3> Normals = new List <Vector3>();
var enusculture = new CultureInfo("en-US");
string currentMaterial = null;
while (!reader.EndOfStream)
{
string line = reader.ReadLine();
line = line.Replace(",", ".");
// Ignore empty lines and comments.
if (String.IsNullOrWhiteSpace(line) || line.StartsWith("#"))
{
continue;
}
string[] args = line.Split(_argSeparators, StringSplitOptions.RemoveEmptyEntries);
if (args.Length == 1)
{
continue;
}
switch (args[0])
{
case "o":
case "g":
currentMesh = new ObjMesh(args.Length > 1 ? args[1] : $"Mesh{Meshes.Count}");
Meshes.Add(currentMesh);
continue;
case "v":
Positions.Add(new Vector3(
Single.Parse(args[1], enusculture),
Single.Parse(args[2], enusculture),
Single.Parse(args[3], enusculture)));
continue;
case "vt":
TexCoords.Add(new Vector2(
Single.Parse(args[1], enusculture),
Single.Parse(args[2], enusculture)));
continue;
case "vn":
Normals.Add(new Vector3(
Single.Parse(args[1], enusculture),
Single.Parse(args[2], enusculture),
Single.Parse(args[3], enusculture)));
continue;
case "f":
if (args.Length != 4)
{
throw new Exception("Obj must be trianglulated!");
}
int[] indices = new int[3 * 2]; //3 faces, position and normal indices
// Only support triangles for now.
ObjFace face = new ObjFace()
{
Vertices = new ObjVertex[3]
};
face.Material = currentMaterial;
for (int i = 0; i < face.Vertices.Length; i++)
{
string[] vertexArgs = args[i + 1].Split(_vertexSeparators, StringSplitOptions.None);
int positionIndex = Int32.Parse(vertexArgs[0]) - 1;
face.Vertices[i].Position = Positions[positionIndex];
if (float.IsNaN(face.Vertices[i].Position.X) ||
float.IsNaN(face.Vertices[i].Position.Y) ||
float.IsNaN(face.Vertices[i].Position.Z))
{
face.Vertices = null;
break;
}
if (vertexArgs.Length > 1 && vertexArgs[1] != String.Empty)
{
face.Vertices[i].TexCoord = TexCoords[Int32.Parse(vertexArgs[1]) - 1];
}
if (vertexArgs.Length > 2 && vertexArgs[2] != String.Empty)
{
face.Vertices[i].Normal = Normals[Int32.Parse(vertexArgs[2]) - 1];
}
}
string faceStr = face.ToString();
if (faceHashes.Contains(faceStr))
{
continue;
}
faceHashes.Add(faceStr);
if (face.Vertices != null)
{
currentMesh.Faces.Add(face);
}
continue;
case "usemtl":
{
if (args.Length < 2)
{
continue;
}
currentMaterial = args[1];
continue;
}
}
}
}
Console.WriteLine($"FACE COUNT {currentMesh.Faces.Count}");
faceDupes.Clear();
if (Meshes.Count == 0) //No object or groups present, use one single mesh
{
Meshes.Add(currentMesh);
}
}