private static void ProcessVertex(string[] vertexData, List <Vector2> texturesList, List <Vector3> normalsList, List <int> indicesList, RawObjModel model)
{
int vertex = int.Parse(vertexData[0]) - 1;
int texture = -1;
if (vertexData.Length > 1)
{
texture = int.Parse(vertexData[1]) - 1;
}
int normal = -1;
if (vertexData.Length > 2)
{
normal = int.Parse(vertexData[2]) - 1;
}
indicesList.Add(vertex);
if (normal != -1)
{
model.Normals[vertex] = normalsList[normal];
}
if (texture != -1)
{
model.TextureCoordinates[vertex] = texturesList[texture];
}
}
public static RawObjModel LoadRawObj(string filePath)
{
if (!File.Exists(filePath))
{
MessageBox.Show("Could not load obj" + filePath);
return(null);
}
StreamReader sr = null;
try
{
sr = new StreamReader(filePath);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
return(null);
}
List <Vector2> TexturesList = new List <Vector2>();
List <Vector3> NormalsList = new List <Vector3>();
List <int> IndicesList = new List <int>();
List <string> MeshMatNamesList = new List <string>();
List <Material> MaterialsList = new List <Material>();
RawObjModel obj = new RawObjModel();
bool listening = false;
string meshname = string.Empty;
Mesh tmpMesh;
string line;
try
{
while ((line = sr.ReadLine()) != null)
{
string[] currentLine = line.Split(' ');
// Generate a Mesh Object or Prepare for an object to be created
if (line.StartsWith("o ") || line.StartsWith("g ") || currentLine[0] == "g")
{
if (!listening)
{
listening = true;
if (currentLine.Length == 1)
{
meshname = "unnamed";
}
else
{
meshname = currentLine[1];
}
}
else
{
// Generate the mesh to put into the array
if (IndicesList.Count > 0)
{
tmpMesh = new Mesh
{
Indices = IndicesList,
MeshName = meshname
};
IndicesList = new List <int>();
obj.Meshes.Add(tmpMesh);
if (currentLine.Length > 1)
{
meshname = currentLine[1];
}
else
{
meshname = "none";
}
}
}
}
// Generate a Vertex Position
else if (line.StartsWith("v "))
{
Vector3 position;
position.X = float.Parse(currentLine[1]);
position.Y = float.Parse(currentLine[2]);
position.Z = float.Parse(currentLine[3]);
obj.Vertices.Add(position);
//add temporary normals and texture
obj.Normals.Add(Vector3.Zero);
obj.TextureCoordinates.Add(Vector2.Zero);
}
// Generate a Vertex Texture Coordinate
else if (line.StartsWith("vt "))
{
Vector2 texture;
texture.X = float.Parse(currentLine[1]);
texture.Y = float.Parse(currentLine[2]);
TexturesList.Add(texture);
}
// Generate a Vertex Normal;
else if (line.StartsWith("vn "))
{
Vector3 normal;
normal.X = float.Parse(currentLine[1]);
normal.Y = float.Parse(currentLine[2]);
normal.Z = float.Parse(currentLine[3]);
NormalsList.Add(normal);
}
// Generate a Face (vertices & indices)
else if (line.StartsWith("f "))
{
string[] vertex1 = currentLine[1].Split('/');
string[] vertex2 = currentLine[2].Split('/');
string[] vertex3 = currentLine[3].Split('/');
ProcessVertex(vertex1, TexturesList, NormalsList, IndicesList, obj);
ProcessVertex(vertex2, TexturesList, NormalsList, IndicesList, obj);
ProcessVertex(vertex3, TexturesList, NormalsList, IndicesList, obj);
}
else if (line.StartsWith("usemtl "))
{
MeshMatNamesList.Add(currentLine[1]);
// Create new Mesh, if Material changes within a group
if (IndicesList.Count > 0)
{
// Create Mesh
tmpMesh = new Mesh
{
MeshName = meshname,
Indices = IndicesList,
};
int i = 2;
while (true)
{
tmpMesh.MeshName = meshname + "_" + i.ToString();
++i;
foreach (var m in obj.Meshes)
{
if (m.MeshName == tmpMesh.MeshName)
{
continue;
}
}
break;
}
// Insert Mesh
obj.Meshes.Add(tmpMesh);
// Cleanup
IndicesList = new List <int>();
}
}
else if (line.StartsWith("mtllib "))
{
MaterialsList = LoadMaterials(currentLine[1]);
}
}
//Deal with last mesh
if (IndicesList.Count > 0)
{
tmpMesh = new Mesh
{
Indices = IndicesList,
MeshName = meshname
};
obj.Meshes.Add(tmpMesh);
}
sr.Close();
if (MaterialsList != null)
{
for (int i = 0; i < MeshMatNamesList.Count; i++)
{
string matname = MeshMatNamesList[i];
for (int j = 0; j < MaterialsList.Count; j++)
{
if (MaterialsList[j].Name == matname)
{
Mesh mesh = obj.Meshes[i];
mesh.MeshMaterial = MaterialsList[j];
obj.Meshes[i] = mesh;
break;
}
}
}
}
return(obj);
}
catch (Exception ex)
{
MessageBox.Show("Could not load model" + ex.Message);
return(null);
}
}
