private Vector <double> CalculateNormal(ModelSpace.Point3D a, ModelSpace.Point3D b, ModelSpace.Point3D c)
{
Vector <double> v1 = Vector <double> .Build.DenseOfArray(new double[] { a.dim[0], a.dim[1], a.dim[2] });
Vector <double> v2 = Vector <double> .Build.DenseOfArray(new double[] { b.dim[0], b.dim[1], b.dim[2] });
Vector <double> v3 = Vector <double> .Build.DenseOfArray(new double[] { c.dim[0], c.dim[1], c.dim[2] });
Vector <double> A = v2 - v1;
Vector <double> B = v3 - v1;
Vector <double> normal = Vector <double> .Build.DenseOfArray(new double[] { A[1] * B[2] - A[2] * B[1], A[2] * B[0] - A[0] * B[2], A[0] * B[1] - A[2] * B[0] });
return(normal.Normalize(1));
}
private Model LoadOffFile(string filename)
{
CultureInfo Culture = (CultureInfo)CultureInfo.CurrentCulture.Clone();
Culture.NumberFormat.CurrencyDecimalSeparator = ".";
StreamReader reader = new StreamReader(filename);
int verticesCount = 0, facesCount = 0, edgesCount = 0;
List <ModelSpace.Point3D> vertices = new List <ModelSpace.Point3D>();
List <ModelSpace.Polygon> faces = new List <ModelSpace.Polygon>();
while (!reader.EndOfStream)
{
string line = reader.ReadLine().ToLower();
if (line.Trim() == string.Empty || line.StartsWith("#"))
{
continue;
}
string[] vals = line.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
if (line == "off")
{
continue;
}
else
{
verticesCount = int.Parse(vals[0]);
facesCount = int.Parse(vals[1]);
edgesCount = int.Parse(vals[2]);
break;
}
}
while (!reader.EndOfStream)
{
string line = reader.ReadLine().ToLower();
if (line.Trim() == string.Empty || line.StartsWith("#"))
{
continue;
}
var vals = line.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
float x = float.Parse(vals[0], NumberStyles.Any, Culture);
float y = float.Parse(vals[1], NumberStyles.Any, Culture);
float z = float.Parse(vals[2], NumberStyles.Any, Culture);
ModelSpace.Point3D newPoint = new ModelSpace.Point3D();
newPoint.dim = Vector <float> .Build.DenseOfArray(new float[] { x, y, z, 1 });
vertices.Add(newPoint);
--verticesCount;
if (verticesCount == 0)
{
break;
}
}
ModelSpace.Point3D[] vertex = vertices.ToArray();
while (!reader.EndOfStream)
{
string line = reader.ReadLine().ToLower();
if (line.Trim() == string.Empty || line.StartsWith("#"))
{
continue;
}
var vals = line.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
//wyliczenie wektora normalnego
Vector <double> normal = CalculateNormal(vertex[int.Parse(vals[1])], vertex[int.Parse(vals[2])], vertex[int.Parse(vals[3])]);
//stworzenie pojedyńczej ściany
faces.Add(new ModelSpace.Polygon(int.Parse(vals[1]), int.Parse(vals[2]), int.Parse(vals[3]), Vector <float> .Build.DenseOfArray(new float[] { (int)normal[0], (int)normal[1], (int)normal[2], 1 })));
}
return(new Model(vertex, faces, (int)image.Width, (int)image.Height, scene));
}
