/// <summary>
/// Parse STL-ASCII-Format.
/// </summary>
/// <param name="file">Stream to parse</param>
private static void ParseASCII(StreamReader file)
{
TriMMApp.CurrentFormat = 1;
String input = null;
int count = 0;
// The numbers in the file must have the decimal separator ".".
NumberFormatInfo nFI = new NumberFormatInfo();
nFI.NumberDecimalSeparator = ".";
file.BaseStream.Position = 0;
StreamReader sr = new StreamReader(file.BaseStream);
List <Vector> normals = new List <Vector>(count);
List <Vertex[]> triangles = new List <Vertex[]>(count);
Vertex[] tmp = new Vertex[3] {
new Vertex(0, 0, 0), new Vertex(0, 0, 0), new Vertex(0, 0, 0)
};
#if !DEBUG
try {
#endif
while ((input = sr.ReadLine()) != null)
{
input = input.Replace("\t", " ").Trim();
if (count == 4)
{
count = 0;
triangles.Add(tmp);
tmp = new Vertex[3] {
new Vertex(0, 0, 0), new Vertex(0, 0, 0), new Vertex(0, 0, 0)
};
}
// RemoveEmptyEntities removes empty entities, resulting from more than one whitespace
String[] v = input.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
if (v.Length > 0)
{
if (v[0].ToLower() == "vertex")
{
// Parse string, NumberStyles.Float secures that different formats can be parsed
// such as: "-2.23454e-001" (exponential format)
for (int i = 0; i < 3; i++)
{
tmp[count - 1][i] = double.Parse(v[i + 1], NumberStyles.Float, nFI);
}
if (!TriMMApp.Mesh.Vertices.Contains(tmp[count - 1]))
{
TriMMApp.Mesh.Vertices.Add(tmp[count - 1]);
}
count++;
}
else if (v[0].ToLower() == "facet")
{
normals.Add(new Vector(double.Parse(v[2], NumberStyles.Float, nFI),
double.Parse(v[3], NumberStyles.Float, nFI), double.Parse(v[4], NumberStyles.Float, nFI)));
count++;
}
}
}
// Adds the Triangles with the given normals to the mesh, calculating their centroid.
for (int i = 0; i < normals.Count; i++)
{
int ind0 = TriMMApp.Mesh.Vertices.IndexOf(triangles[i][0]);
int ind1 = TriMMApp.Mesh.Vertices.IndexOf(triangles[i][1]);
int ind2 = TriMMApp.Mesh.Vertices.IndexOf(triangles[i][2]);
Vertex centroid = Triangle.GetCentroidOf(triangles[i][0], triangles[i][1], triangles[i][2]);
centroid.Normal = normals[i];
Triangle newTriangle = new Triangle(ind0, ind1, ind2);
newTriangle.Centroid = centroid;
TriMMApp.Mesh.Add(newTriangle);
}
#if !DEBUG
}
catch {
MessageBox.Show(TriMMApp.Lang.GetElementsByTagName("STLBrokenFileError")[0].InnerText, TriMMApp.Lang.GetElementsByTagName("ErrorTitle")[0].InnerText, MessageBoxButton.OK, MessageBoxImage.Error);
} finally {
#endif
sr.Close();
#if !DEBUG
}
#endif
TriMMApp.Mesh.Finish(false);
TriangleMesh mesh = TriMMApp.Mesh;
TriMMApp.VertexNormalAlgorithm.GetVertexNormals(ref mesh);
TriMMApp.Mesh.SetArrays();
}
/// <summary>
/// Parses a binary STL file.
/// </summary>
/// <remarks>
/// Because ASCII STL files can become very large, a binary version of STL exists.
/// A binary STL file has an 80 character header (which is generally ignored - but
/// which should never begin with 'solid' because that will lead most software to assume
/// that this is an ASCII STL file). Following the header is a 4 byte unsigned
/// integer indicating the number of triangular facets in the file. Following that
/// is data describing each triangle in turn. The file simply ends after the last triangle.
/// Each triangle is described by twelve floating point numbers: three for the normal
/// and then three for the X/Y/Z coordinate of each vertex - just as with the ASCII version
/// of STL. After the twelve floats there is a two byte unsigned 'short' integer that
/// is the 'attribute byte count' - in the standard format, this should be zero because most
/// software does not understand anything else.( http://en.wikipedia.org/wiki/STL_(file_format) )
/// </remarks>
/// <param name="file">Stream to parse</param>
private static void ParseBinary(StreamReader file)
{
TriMMApp.CurrentFormat = 2;
BinaryReader binReader = new BinaryReader(file.BaseStream);
// Set stream back to zero.
binReader.BaseStream.Position = 0;
char[] charBuf = new char[80];
// The first 80 bytes are trash
binReader.Read(charBuf, 0, 80);
// Next 4 bytes contain the count of the normal/3D-vertexes record
int count = (int)binReader.ReadUInt32();
// Throw InvalidDataException if size does not fit
// 84 Byte for header+count, count * (size of data = 50 Bytes)
if (binReader.BaseStream.Length != (84 + count * 50))
{
throw new InvalidDataException();
}
#if !DEBUG
try {
#endif
List <Vector> normals = new List <Vector>(count);
List <Vertex[]> triangles = new List <Vertex[]>(count);
// Read the records
for (int i = 0; i < count; i++)
{
Vertex[] tmp = new Vertex[3] {
new Vertex(0, 0, 0), new Vertex(0, 0, 0), new Vertex(0, 0, 0)
};
// Normal/vertices
// First one is the normal
normals.Add(new Vector((double)binReader.ReadSingle(), (double)binReader.ReadSingle(), (double)binReader.ReadSingle()));
// Next three are vertices
for (int j = 0; j < 3; j++)
{
for (int k = 0; k < 3; k++)
{
tmp[j][k] = (double)binReader.ReadSingle();
}
}
triangles.Add(tmp);
TriMMApp.Mesh.Vertices = TriMMApp.Mesh.Vertices.Union(tmp).ToList();
// Last two bytes are only to fill up to 50 bytes
binReader.Read(charBuf, 0, 2);
}
// Adds the Triangles with the given normals to the mesh, calculating their centroid.
for (int i = 0; i < count; i++)
{
int ind0 = TriMMApp.Mesh.Vertices.IndexOf(triangles[i][0]);
int ind1 = TriMMApp.Mesh.Vertices.IndexOf(triangles[i][1]);
int ind2 = TriMMApp.Mesh.Vertices.IndexOf(triangles[i][2]);
Vertex centroid = Triangle.GetCentroidOf(triangles[i][0], triangles[i][1], triangles[i][2]);
centroid.Normal = normals[i];
Triangle newTriangle = new Triangle(ind0, ind1, ind2);
newTriangle.Centroid = centroid;
TriMMApp.Mesh.Add(newTriangle);
}
#if !DEBUG
}
catch {
MessageBox.Show(TriMMApp.Lang.GetElementsByTagName("STLBrokenFileError")[0].InnerText, TriMMApp.Lang.GetElementsByTagName("ErrorTitle")[0].InnerText, MessageBoxButton.OK, MessageBoxImage.Error);
} finally {
#endif
binReader.Close();
#if !DEBUG
}
#endif
TriMMApp.Mesh.Finish(false);
TriangleMesh mesh = TriMMApp.Mesh;
TriMMApp.VertexNormalAlgorithm.GetVertexNormals(ref mesh);
TriMMApp.Mesh.SetArrays();
}