public static IModel GetModel(float radius)
{
TeapotModel model = TeapotLoader.GetModel();
for (int i = 0; i < model.positions.Count; i++)
{
model.positions[i] *= radius;
}
return(model);
}
public static TeapotModel GetModel()
{
if (model == null)
{
lock (synObj)
{
if (model == null)
{
model = Load();
}
}
}
return(model);
}
public static TeapotModel Load()
{
StackTrace stack = new StackTrace();
StackFrame frame = stack.GetFrame(1);
MethodBase method = frame.GetMethod();
Type type = method.ReflectedType;
Assembly executingAssembly = type.Assembly;
string textFileName = "Models.TeapotModel.obj";
string pathToDots = textFileName.Replace("\\", ".");
string location = string.Format("{0}.{1}", executingAssembly.GetName().Name, pathToDots);
using (var stream = executingAssembly.GetManifestResourceStream(location))
{
using (var reader = new StreamReader(stream))
{
TeapotModel model = LoadModels(reader);
GenNormals(model);
return(model);
}
}
}
private static void GenNormals(TeapotModel model)
{
var faceNormals = new vec3[model.faces.Count];
model.normals.AddRange(new vec3[model.positions.Count]);
for (int i = 0; i < model.faces.Count; i++)
{
var face = model.faces[i];
vec3 vertex0 = model.positions[face.Item1 - 1];
vec3 vertex1 = model.positions[face.Item2 - 1];
vec3 vertex2 = model.positions[face.Item3 - 1];
vec3 v1 = vertex0 - vertex2;
vec3 v2 = vertex2 - vertex1;
faceNormals[i] = v2.cross(v1).normalize();
}
for (int i = 0; i < model.positions.Count; i++)
{
vec3 sum = new vec3();
int shared = 0;
for (int j = 0; j < model.faces.Count; j++)
{
var face = model.faces[j];
if (face.Item1 - 1 == i || face.Item2 - 1 == i || face.Item3 - 1 == i)
{
sum = sum + faceNormals[j];
shared++;
}
}
if (shared > 0)
{
sum = (sum / shared).normalize();
}
model.normals[i] = sum;
}
}
private static TeapotModel LoadModels(StreamReader stream)
{
var model = new TeapotModel();
List <String> headers = new List <string>();
while (!stream.EndOfStream)
{
string line = stream.ReadLine();
string[] parts = line.Split(separator, StringSplitOptions.RemoveEmptyEntries);
if (parts[0] == ("v"))
{
vec3 position = new vec3(float.Parse(parts[1]), float.Parse(parts[2]), float.Parse(parts[3]));
model.positions.Add(position);
}
else if (parts[0] == ("vn"))
{
vec3 normal = new vec3(float.Parse(parts[1]), float.Parse(parts[2]), float.Parse(parts[3]));
model.normals.Add(normal);
}
else if (parts[0] == ("f"))
{
//ushort index = ushort.Parse(parts[1]);
var face = new Tuple <ushort, ushort, ushort>(ushort.Parse(parts[1]), ushort.Parse(parts[2]), ushort.Parse(parts[3]));
model.faces.Add(face);
}
else
{
if (!headers.Contains(parts[0]))
{
headers.Add(parts[0]);
}
}
}
return(model);
}