private int lastCircle(Vector3 v1, Vector3 v2, SceneBrep scene, Matrix4 m)
{
_ = createCircleAround(v1, v2);
Vector3 center = getCenter(last_circle);
Vector3 dif = (v2 - v1) * size;
_ = (v2 - v1) * (1 - size);
int[] v = new int[cdetail];
for (int i = 0; i < cdetail; i++)
{
v[i] = scene.AddVertex(Vector3.TransformPosition(last_circle[i] + dif, m));
scene.SetNormal(v[i], Vector3.TransformVector(last_circle[i] - center, m).Normalized());
float r = (last_circle[i].X + 1.1f) / 2.5f;
float g = (last_circle[i].Y + 1.1f) / 2.5f;
float b = (last_circle[i].Z + 1.1f) / 2.5f;
scene.SetColor(v[i], new Vector3(r, g, b));
}
for (int i = 0; i < cdetail - 1; i++)
{
scene.AddTriangle(connect_indices[i], v[i], connect_indices[i + 1]);
scene.AddTriangle(connect_indices[i + 1], v[i], v[i + 1]);
}
scene.AddTriangle(connect_indices[cdetail - 1], v[cdetail - 1], connect_indices[0]);
scene.AddTriangle(connect_indices[0], v[cdetail - 1], v[0]);
return(cdetail * 2);
}
private int CreateTetrahedron(SceneBrep scene, Matrix4 m, Vector3 center, float size)
{
int[] v = new int[4];
float z = (float)(size * Math.Sqrt(0.5));
Vector3 A = new Vector3(size, 0.0f, -z);
Vector3 B = new Vector3(-size, 0.0f, -z);
Vector3 C = new Vector3(0.0f, size, z);
Vector3 D = new Vector3(0.0f, -size, z);
// vertices:
v[0] = scene.AddVertex(Vector3.TransformPosition(A, m));
v[1] = scene.AddVertex(Vector3.TransformPosition(B, m));
v[2] = scene.AddVertex(Vector3.TransformPosition(C, m));
v[3] = scene.AddVertex(Vector3.TransformPosition(D, m));
// normal vectors:
scene.SetNormal(v[0], Vector3.TransformVector(A, m).Normalized());
scene.SetNormal(v[1], Vector3.TransformVector(B, m).Normalized());
scene.SetNormal(v[2], Vector3.TransformVector(C, m).Normalized());
scene.SetNormal(v[3], Vector3.TransformVector(D, m).Normalized());
// texture coordinates:
scene.SetTxtCoord(v[0], new Vector2(1.0f, 0.0f));
scene.SetTxtCoord(v[1], new Vector2(0.0f, 0.0f));
scene.SetTxtCoord(v[2], new Vector2(1.0f, 1.0f));
scene.SetTxtCoord(v[3], new Vector2(0.0f, 1.0f));
// colors:
long seed = (long)Math.Min(long.MaxValue, (m.Row3.LengthSquared * 10000.0f));
seed = RandomStatic.numericRecipes(seed);
float r = (seed & 255) / 255.0f;
seed = RandomStatic.numericRecipes(seed);
float g = (seed & 255) / 255.0f;
seed = RandomStatic.numericRecipes(seed);
float b = (seed & 255) / 255.0f;
scene.SetColor(v[0], new Vector3(r, g, b));
r = Math.Min(r + 0.2f, 1.0f);
scene.SetColor(v[1], new Vector3(r, g, b));
g = Math.Min(g + 0.2f, 1.0f);
scene.SetColor(v[2], new Vector3(r, g, b));
b = Math.Min(b + 0.2f, 1.0f);
scene.SetColor(v[3], new Vector3(r, g, b));
// triangle faces:
scene.AddTriangle(v[0], v[1], v[2]);
scene.AddTriangle(v[2], v[1], v[3]);
scene.AddTriangle(v[1], v[0], v[3]);
scene.AddTriangle(v[2], v[3], v[0]);
return(4);
}
void ConnectTwoCircles(SceneBrep scene, List <List <Vector3> > MeshV, int total, int index)
{
List <int> firstCirc = new List <int>();
List <int> secCirc = new List <int>();
int count = MeshV[index].Count;
if (index != 0)
{
for (int i = total; i > total - count; i--)
{
firstCirc.Add(i);
secCirc.Add(i - count);
}
//for (int i = 0; i < firstCirc.Count; i++) {
// scene.AddLine(firstCirc[i], secCirc[i]);
// scene.AddLine(firstCirc[i], secCirc[(i + 1 == secCirc .Count ? 0 : i+1)]);
//}
}
else
{
for (int i = total; i > total - count; i--)
{
firstCirc.Add(i);
secCirc.Add(total - i + count);
}
//for (int i = 0; i < firstCirc.Count; i++) {
// scene.AddLine(firstCirc[i], secCirc[i]);
// scene.AddLine(firstCirc[i], secCirc[(i + 1 == secCirc.Count ? 0 : i+1)]);
//}
}
for (int i = 0; i < firstCirc.Count; i++)
{
scene.AddTriangle(firstCirc[i], secCirc[i], secCirc[(i + 1 == secCirc.Count ? 0 : i + 1)]);
this.GeneratedFaces++;
scene.AddTriangle(
firstCirc[(i + 1 == firstCirc.Count ? 0 : i + 1)],
firstCirc[i],
secCirc[(i + 1 == secCirc.Count ? 0 : i + 1)]);
this.GeneratedFaces++;
}
}
/// <summary>
/// Do Loop subdivision of the input control triangle mesh.
/// </summary>
/// <param name="scene">Input scene (must not be changed).</param>
/// <param name="epsilon">Reference error toleration (size of undivided triangle).</param>
/// <param name="normals">Generate normals? (optional)</param>
/// <param name="colors">Generate colors? (optional)</param>
/// <param name="txtcoord">Generate texture coordinates? (optional)</param>
/// <param name="time">Current time for animation (optional)</param>
/// <param name="param">Optional additional parameters.</param>
/// <returns>Number of generated points.</returns>
public int Subdivide(SceneBrep scene, float epsilon, bool normals, bool colors, bool txtcoord, float time, string param)
{
result = scene.Clone();
// !!!{{ TODO: put your Loop subdivision code here
// pilot: do one (trivial) division
int triangles = result.Triangles;
int tr;
for (tr = 0; tr < triangles; tr++)
{
int A, B, C;
result.GetTriangleVertices(tr, out A, out B, out C);
Vector3 vA = result.GetVertex(A);
Vector3 vB = result.GetVertex(B);
Vector3 vC = result.GetVertex(C);
Vector3 vA2 = (vB + vC) * 0.5f;
Vector3 vB2 = (vA + vC) * 0.5f;
Vector3 vC2 = (vA + vB) * 0.5f;
int A2 = result.AddVertex(vA2);
int B2 = result.AddVertex(vB2);
int C2 = result.AddVertex(vC2);
result.AddTriangle(B2, C2, A2);
result.AddTriangle(B2, A2, C);
result.AddTriangle(C2, B, A2);
result.SetTriangleVertices(tr, A, C2, B2);
}
//result.BuildCornerTable();
return(result.Vertices);
// !!!}}
}
/// <summary>
/// Construct a new control mesh for subdivision (formally the Brep solid..).
/// </summary>
/// <param name="scene">B-rep scene to be modified</param>
/// <param name="m">Transform matrix (object-space to world-space)</param>
/// <param name="time">Current time in seconds</param>
/// <param name="param">Shape parameters if needed</param>
public void ControlMesh(SceneBrep scene, Matrix4 m, float time, string param)
{
// !!!{{ TODO: put your Control-mesh-construction code here
List <int> upper = new List <int>();
upper.Add(scene.AddVertex(Vector3.TransformPosition(new Vector3(0, 1, 0), m)));
upper.Add(scene.AddVertex(Vector3.TransformPosition(new Vector3(1, 1, 0), m)));
upper.Add(scene.AddVertex(Vector3.TransformPosition(new Vector3(1, 1, 1), m)));
upper.Add(scene.AddVertex(Vector3.TransformPosition(new Vector3(0, 1, 1), m)));
List <int> lower = new List <int>();
lower.Add(scene.AddVertex(Vector3.TransformPosition(new Vector3(0, 0, 0), m)));
lower.Add(scene.AddVertex(Vector3.TransformPosition(new Vector3(1, 0, 0), m)));
lower.Add(scene.AddVertex(Vector3.TransformPosition(new Vector3(1, 0, 1), m)));
lower.Add(scene.AddVertex(Vector3.TransformPosition(new Vector3(0, 0, 1), m)));
// Lower face
scene.AddTriangle(lower[0], lower[1], lower[2]);
scene.AddTriangle(lower[2], lower[3], lower[0]);
// Upper face
scene.AddTriangle(upper[2], upper[1], upper[0]);
scene.AddTriangle(upper[0], upper[3], upper[2]);
// Side faces
for (int i = 0; i < upper.Count; i++)
{
int j = i < (upper.Count - 1) ? i + 1 : 0;
scene.AddTriangle(upper[i], upper[j], lower[i]);
scene.AddTriangle(lower[i], upper[j], lower[j]);
}
// !!!}}
}
/// <summary>
/// Reads one 3D scene from a given stream (containing text variant of Wavefront OBJ format).
/// </summary>
/// <param name="reader">Already open text reader</param>
/// <param name="scene">Scene to be modified</param>
/// <param name="scene">Matrix for instancing</param>
/// <returns>Number of faces read</returns>
public int ReadBrep( StreamReader reader, SceneBrep scene, Matrix4 m )
{
if ( reader == null ) return SceneBrep.NULL;
Debug.Assert( scene != null );
int v0 = scene.Vertices;
int faces = 0;
List<Vector3> normals = new List<Vector3>( 256 );
int[] f = new int[ 3 ];
do
{
string line = reader.ReadLine();
if ( line == null ) break;
int commentPos = line.IndexOf( COMMENT );
if ( commentPos >= 0 )
line = line.Substring( 0, commentPos );
string[] tokens = line.Split( ' ' );
switch ( tokens[ 0 ] )
{
case VERTEX:
if ( tokens.Length < 4 ) continue;
Vector3 coord;
if ( !float.TryParse( tokens[ 1 ], NumberStyles.Float, CultureInfo.InvariantCulture, out coord.X ) ||
!float.TryParse( tokens[ 2 ], NumberStyles.Float, CultureInfo.InvariantCulture, out coord.Y ) ||
!float.TryParse( tokens[ 3 ], NumberStyles.Float, CultureInfo.InvariantCulture, out coord.Z ) )
continue;
if ( MirrorConversion )
coord.Z = -coord.Z;
scene.AddVertex( Vector3.Transform( coord, m ) );
break;
case VERTEX_NORMAL:
if ( tokens.Length < 4 ) continue;
Vector3 norm;
if ( !float.TryParse( tokens[ 1 ], NumberStyles.Float, CultureInfo.InvariantCulture, out norm.X ) ||
!float.TryParse( tokens[ 2 ], NumberStyles.Float, CultureInfo.InvariantCulture, out norm.Y ) ||
!float.TryParse( tokens[ 3 ], NumberStyles.Float, CultureInfo.InvariantCulture, out norm.Z ) )
continue;
if ( MirrorConversion )
norm.Z = -norm.Z;
normals.Add( Vector3.TransformNormal( norm, m ) );
break;
case FACE:
if ( tokens.Length < 4 ) continue;
int i;
for ( i = 0; i < 3; i++ )
{
string[] vt = tokens[ i + 1 ].Split( '/' );
int ti, ni;
ti = ni = SceneBrep.NULL;
// 0 .. vertex coord index
if ( !int.TryParse( vt[ 0 ], out f[ i ] ) ) break;
f[ i ] = v0 + f[ i ] - 1;
if ( vt.Length >= 2 )
{
// 1 .. texture coord index (not yet)
int.TryParse( vt[ 1 ], out ti );
ti--;
if ( vt.Length >= 3 )
{
// 2 .. normal vector index
int.TryParse( vt[ 2 ], out ni );
ni--;
}
}
if ( ni >= 0 && ni < normals.Count )
scene.SetNormal( f[ i ], normals[ ni ] );
}
if ( i >= 3 )
{
scene.AddTriangle( f[ 0 ], f[ 1 ], f[ 2 ] );
faces++;
}
break;
}
}
while ( !reader.EndOfStream );
return faces;
}
private int createBentPipe(SceneBrep scene, Matrix4 m, Vector3 v1, Vector3 v2, Vector3 v3)
{
Vector3[] centers = new Vector3[bdetail];
Vector3 oned = (v1 - v2) * size;
Vector3 twod = (v3 - v2) * size;
Vector3 rtwod = (v3 - v2) * (1 - size);
Vector3 rot_point = v2 + oned + twod;
Vector3 test_point = oned + twod;
test_point.X = Math.Abs(test_point.X);
test_point.Y = Math.Abs(test_point.Y);
test_point.Z = Math.Abs(test_point.Z);
double angle = -(Math.PI / 2) / (bdetail - 1);
char axis;
if (test_point.Y < test_point.X)
{
axis = (test_point.Z < test_point.Y) ? 'z' : 'y';
}
else
{
axis = (test_point.Z < test_point.X) ? 'z' : 'x';
}
MyMatrix4 mat = MyMatrix4.getSingleRotationMatrix(angle, axis);
float l = longestSide(last_circle[0] - v1);
Vector3 sp = rotateAroundPoint(last_circle[0], rot_point, mat);
float l2 = longestSide(sp - v1);
if (l2 < l)
{
mat = MyMatrix4.getSingleRotationMatrix(-angle, axis);
}
Vector3[] field = new Vector3[bdetail * cdetail];
Array.Copy(last_circle, field, cdetail);
centers[0] = getCenter(last_circle);
Vector3[] new_circle = new Vector3[cdetail];
for (int i = 1; i < bdetail; i++)
{
Array.ConstrainedCopy(field, (i - 1) * cdetail, new_circle, 0, cdetail);
new_circle = rotateAroundPoint(new_circle, rot_point, mat);
Array.ConstrainedCopy(new_circle, 0, field, i * cdetail, cdetail);
centers[i] = getCenter(new_circle);
}
Array.ConstrainedCopy(field, (bdetail - 1) * cdetail, last_circle, 0, cdetail);
for (int i = 0; i < cdetail; i++)
{
last_circle[i] += rtwod - twod;
}
int[] v = new int[field.Length];
for (int i = 0; i < field.Length; i++)
{
v[i] = scene.AddVertex(Vector3.TransformPosition(field[i], m));
scene.SetNormal(v[i], Vector3.TransformVector(field[i] - centers[i / cdetail], m).Normalized());
float r = (field[i].X + 1.1f) / 2.5f;
float g = (field[i].Y + 1.1f) / 2.5f;
float b = (field[i].Z + 1.1f) / 2.5f;
scene.SetColor(v[i], new Vector3(r, g, b));
}
for (int i = 0; i < cdetail - 1; i++)
{
scene.AddTriangle(connect_indices[i], v[i], connect_indices[i + 1]);
scene.AddTriangle(connect_indices[i + 1], v[i], v[i + 1]);
}
scene.AddTriangle(connect_indices[cdetail - 1], v[cdetail - 1], connect_indices[0]);
scene.AddTriangle(connect_indices[0], v[cdetail - 1], v[0]);
for (int i = 0; i < (bdetail - 1); i++)
{
for (int j = 0; j < cdetail - 1; j++)
{
int a = i * cdetail + j;
scene.AddTriangle(v[a], v[a + cdetail], v[a + 1]);
scene.AddTriangle(v[a + 1], v[a + cdetail], v[a + cdetail + 1]);
}
int b = i * cdetail + cdetail - 1;
scene.AddTriangle(v[b], v[b + cdetail], v[b - cdetail + 1]);
scene.AddTriangle(v[b - cdetail + 1], v[b + cdetail], v[b + 1]);
}
Array.ConstrainedCopy(v, (bdetail - 1) * cdetail, connect_indices, 0, cdetail);
return(bdetail * cdetail * 2 + cdetail * 2);
}
public int ReadBrep(string fileName, SceneBrep scene)
{
Debug.Assert(scene != null);
this.scene = scene;
scene.Reset();
if (fileName == null || fileName.Length == 0)
{
throw new IOException("Invalid file name");
}
if (fileName.EndsWith(".gz"))
{
headerReader = new StreamReader(new GZipStream(new FileStream(fileName, FileMode.Open), CompressionMode.Decompress));
}
else
{
var fs = new FileStream(fileName, FileMode.Open);
headerReader = new StreamReader(fs);
}
// prepare buffers for data filling
if (!ParseHeader())
{
return(-1);
}
// read vertices
var vertexReader = GetReader("vertex");
var element = vertexReader.ReadElement();
List <Vector2> txtCoords = new List <Vector2>(256);
int[] f = new int[3];
int v0 = scene.Vertices;
int lastVertex = v0 - 1;
while (element != null)
{
lastVertex = scene.AddVertex(Vector3.TransformPosition(element.GetVertex(), matrix));
if (DoNormals)
{
Vector3.TransformNormal(element.GetNormal(), matrix);
scene.SetNormal(lastVertex, element.GetNormal());
}
if (DoTxtCoords)
{
scene.SetTxtCoord(lastVertex, element.GetTextureCoordinate());
}
if (DoColors)
{
scene.SetColor(lastVertex, element.GetVertexColor());
}
element = vertexReader.ReadElement();
}
// read triangles
var faceReader = GetReader("face");
element = faceReader.ReadElement();
while (element != null)
{
int A, B, C;
element.GetTriangleVertices(out A, out B, out C);
scene.AddTriangle(A, B, C);
element = faceReader.ReadElement();
}
headerReader.Close();
vertexReader.Close();
faceReader.Close();
return(scene.Triangles);
}
/// <summary>
/// Reads one 3D scene from a given stream (containing text variant of Wavefront OBJ format).
/// </summary>
/// <param name="reader">Already open text reader</param>
/// <param name="scene">Scene to be modified</param>
/// <param name="scene">Matrix for instancing</param>
/// <returns>Number of faces read</returns>
public int ReadBrep(StreamReader reader, SceneBrep scene, Matrix4 m)
{
if (reader == null)
{
return(SceneBrep.NULL);
}
Debug.Assert(scene != null);
int v0 = scene.Vertices;
int lastVertex = v0 - 1;
int faces = 0;
List <Vector2> txtCoords = new List <Vector2>(256);
List <Vector3> normals = new List <Vector3>(256);
int lastTxtCoord = -1;
int lastNormal = -1;
int[] f = new int[3];
do
{
string line = reader.ReadLine();
if (line == null)
{
break;
}
int commentPos = line.IndexOf(COMMENT);
if (commentPos >= 0)
{
line = line.Substring(0, commentPos);
}
string[] tokens = line.Split(DELIMITERS, StringSplitOptions.RemoveEmptyEntries);
if (tokens.Length < 1)
{
continue;
}
switch (tokens[0])
{
case VERTEX:
if (tokens.Length < 4)
{
continue;
}
Vector3 coord;
if (!float.TryParse(tokens[1], NumberStyles.Float, CultureInfo.InvariantCulture, out coord.X) ||
!float.TryParse(tokens[2], NumberStyles.Float, CultureInfo.InvariantCulture, out coord.Y) ||
!float.TryParse(tokens[3], NumberStyles.Float, CultureInfo.InvariantCulture, out coord.Z))
{
continue;
}
if (MirrorConversion)
{
coord.Z = -coord.Z;
}
lastVertex = scene.AddVertex(Vector3.TransformPosition(coord, m));
break;
case VERTEX_TEXTURE:
if (tokens.Length < 3)
{
continue;
}
Vector2 txtCoord;
if (!float.TryParse(tokens[1], NumberStyles.Float, CultureInfo.InvariantCulture, out txtCoord.X) ||
!float.TryParse(tokens[2], NumberStyles.Float, CultureInfo.InvariantCulture, out txtCoord.Y))
{
continue;
}
if (TextureUpsideDown)
{
txtCoord.Y = 1.0f - txtCoord.Y;
}
txtCoords.Add(txtCoord);
lastTxtCoord++;
break;
case VERTEX_NORMAL:
if (tokens.Length < 4)
{
continue;
}
Vector3 norm;
if (!float.TryParse(tokens[1], NumberStyles.Float, CultureInfo.InvariantCulture, out norm.X) ||
!float.TryParse(tokens[2], NumberStyles.Float, CultureInfo.InvariantCulture, out norm.Y) ||
!float.TryParse(tokens[3], NumberStyles.Float, CultureInfo.InvariantCulture, out norm.Z))
{
continue;
}
if (MirrorConversion)
{
norm.Z = -norm.Z;
}
normals.Add(Vector3.TransformNormal(norm, m));
lastNormal++;
break;
case FACE:
if (tokens.Length < 4)
{
continue;
}
int N = tokens.Length - 1;
if (f.Length < N)
{
f = new int[N];
}
int i;
for (i = 0; i < N; i++) // read indices for one vertex
{
string[] vt = tokens[i + 1].Split('/');
int ti, ni;
ti = ni = 0; // 0 => value not present
// 0 .. vertex coord index
if (!int.TryParse(vt[0], out f[i]) ||
f[i] == 0)
{
break;
}
if (f[i] > 0)
{
f[i] = v0 + f[i] - 1;
}
else
{
f[i] = lastVertex + 1 - f[i];
}
if (vt.Length > 1)
{
// 1 .. texture coord index (not yet)
if (!int.TryParse(vt[1], out ti))
{
ti = 0;
}
if (vt.Length > 2)
{
// 2 .. normal vector index
if (!int.TryParse(vt[2], out ni))
{
ni = 0;
}
}
}
// there was a texture coord..
if (ti != 0)
{
if (ti > 0)
{
ti--;
}
else
{
ti = lastTxtCoord + 1 - ti;
}
if (ti >= 0 && ti < txtCoords.Count)
{
scene.SetTxtCoord(f[i], txtCoords[ti]);
}
}
// there was a normal..
if (ni != 0)
{
if (ni > 0)
{
ni--;
}
else
{
ni = lastNormal + 1 - ni;
}
if (ni >= 0 && ni < normals.Count)
{
scene.SetNormal(f[i], normals[ni]);
}
}
}
N = i;
for (i = 1; i < N - 1; i++)
{
scene.AddTriangle(f[0], f[i], f[i + 1]);
faces++;
}
break;
}
} while (!reader.EndOfStream);
return(faces);
}
/// <summary>
/// Reads one 3D scene from a given stream (containing text variant of Wavefront OBJ format).
/// </summary>
/// <param name="reader">Already open text reader</param>
/// <param name="scene">Scene to be modified</param>
/// <param name="scene">Matrix for instancing</param>
/// <returns>Number of faces read</returns>
public int ReadBrep( StreamReader reader, SceneBrep scene, Matrix4 m )
{
if ( reader == null ) return SceneBrep.NULL;
Debug.Assert( scene != null );
int v0 = scene.Vertices;
int lastVertex = v0 - 1;
int faces = 0;
List<Vector3> normals = new List<Vector3>( 256 );
int lastNormal = -1;
int[] f = new int[ 3 ];
do
{
string line = reader.ReadLine();
if ( line == null ) break;
int commentPos = line.IndexOf( COMMENT );
if ( commentPos >= 0 )
line = line.Substring( 0, commentPos );
string[] tokens = line.Split( DELIMITERS , StringSplitOptions.RemoveEmptyEntries );
if ( tokens.Length < 1 ) continue;
switch ( tokens[ 0 ] )
{
case VERTEX:
if ( tokens.Length < 4 ) continue;
Vector3 coord;
if ( !float.TryParse( tokens[ 1 ], NumberStyles.Float, CultureInfo.InvariantCulture, out coord.X ) ||
!float.TryParse( tokens[ 2 ], NumberStyles.Float, CultureInfo.InvariantCulture, out coord.Y ) ||
!float.TryParse( tokens[ 3 ], NumberStyles.Float, CultureInfo.InvariantCulture, out coord.Z ) )
continue;
if ( MirrorConversion )
coord.Z = -coord.Z;
lastVertex = scene.AddVertex( Vector3.Transform( coord, m ) );
break;
case VERTEX_NORMAL:
if ( tokens.Length < 4 ) continue;
Vector3 norm;
if ( !float.TryParse( tokens[ 1 ], NumberStyles.Float, CultureInfo.InvariantCulture, out norm.X ) ||
!float.TryParse( tokens[ 2 ], NumberStyles.Float, CultureInfo.InvariantCulture, out norm.Y ) ||
!float.TryParse( tokens[ 3 ], NumberStyles.Float, CultureInfo.InvariantCulture, out norm.Z ) )
continue;
if ( MirrorConversion )
norm.Z = -norm.Z;
normals.Add( Vector3.TransformNormal( norm, m ) );
lastNormal++;
break;
case FACE:
if ( tokens.Length < 4 ) continue;
int N = tokens.Length - 1;
if ( f.Length < N )
f = new int[ N ];
int i;
for ( i = 0; i < N; i++ ) // read indices for one vertex
{
string[] vt = tokens[ i + 1 ].Split( '/' );
int ti, ni;
ti = ni = 0; // 0 => value not present
// 0 .. vertex coord index
if ( !int.TryParse( vt[ 0 ], out f[ i ] ) ||
f[ i ] == 0 )
break;
if ( f[ i ] > 0 )
f[ i ] = v0 + f[ i ] - 1;
else
f[ i ] = lastVertex + 1 - f[ i ];
if ( vt.Length > 1 )
{
// 1 .. texture coord index (not yet)
if ( !int.TryParse( vt[ 1 ], out ti ) ) ti = 0;
if ( vt.Length > 2 )
{
// 2 .. normal vector index
if ( !int.TryParse( vt[ 2 ], out ni ) ) ni = 0;
}
}
// there was a normal..
if ( ni != 0 )
{
if ( ni > 0 )
ni--;
else
ni = lastNormal + 1 - ni;
if ( ni >= 0 && ni < normals.Count )
scene.SetNormal( f[ i ], normals[ ni ] );
}
}
N = i;
for ( i = 1; i < N - 1; i++ )
{
scene.AddTriangle( f[ 0 ], f[ i ], f[ i + 1 ] );
faces++;
}
break;
}
}
while ( !reader.EndOfStream );
return faces;
}