private void ExtractSquare(int r, Int16Triple p, MeshBuilder_IntegerVertex mb)
{
int p0x, p0y, p0z, p1x, p1y, p1z, p2x, p2y, p2z;//
Int16Triple deltaA0 = VertexIndexToPositionDelta[AdjIndexToVertexIndices[r][0].X];
Int16Triple deltaA1 = VertexIndexToPositionDelta[AdjIndexToVertexIndices[r][0].Y];
Int16Triple deltaA2 = VertexIndexToPositionDelta[AdjIndexToVertexIndices[r][0].Z];
p0x = p.X + deltaA0.X;
p0y = p.Y + deltaA0.Y;
p0z = p.Z + deltaA0.Z;
p1x = p.X + deltaA1.X;
p1y = p.Y + deltaA1.Y;
p1z = p.Z + deltaA1.Z;
p2x = p.X + deltaA2.X;
p2y = p.Y + deltaA2.Y;
p2z = p.Z + deltaA2.Z;
mb.AddTriangle(new Int16Triple(p0x, p0y, p0z), new Int16Triple(p1x, p1y, p1z), new Int16Triple(p2x, p2y, p2z));
Int16Triple deltaB0 = VertexIndexToPositionDelta[AdjIndexToVertexIndices[r][1].X];
Int16Triple deltaB1 = VertexIndexToPositionDelta[AdjIndexToVertexIndices[r][1].Y];
Int16Triple deltaB2 = VertexIndexToPositionDelta[AdjIndexToVertexIndices[r][1].Z];
p0x = p.X + deltaB0.X;
p0y = p.Y + deltaB0.Y;
p0z = p.Z + deltaB0.Z;
p1x = p.X + deltaB1.X;
p1y = p.Y + deltaB1.Y;
p1z = p.Z + deltaB1.Z;
p2x = p.X + deltaB2.X;
p2y = p.Y + deltaB2.Y;
p2z = p.Z + deltaB2.Z;
mb.AddTriangle(new Int16Triple(p0x, p0y, p0z), new Int16Triple(p1x, p1y, p1z), new Int16Triple(p2x, p2y, p2z));
}
}//judge if a voxel is inside the surface
public static void InitAdj6(Int16Triple[] adjPoints6, Int16Triple p)
{
adjPoints6[0].X = p.X;
adjPoints6[0].Y = p.Y + 1;
adjPoints6[0].Z = p.Z;
adjPoints6[1].X = p.X;
adjPoints6[1].Y = p.Y - 1;
adjPoints6[1].Z = p.Z;
adjPoints6[2].X = p.X + 1;
adjPoints6[2].Y = p.Y;
adjPoints6[2].Z = p.Z;
adjPoints6[3].X = p.X - 1;
adjPoints6[3].Y = p.Y;
adjPoints6[3].Z = p.Z;
adjPoints6[4].X = p.X;
adjPoints6[4].Y = p.Y;
adjPoints6[4].Z = p.Z + 1;
adjPoints6[5].X = p.X;
adjPoints6[5].Y = p.Y;
adjPoints6[5].Z = p.Z - 1;
}//initialize poistions of the 6-adjacency points
public void AddTriangle(Int16Triple p0, Int16Triple p1, Int16Triple p2)
{
int p0i;
int p1i;
int p2i;
int index = 0;
bool hasValue;
hasValue = hashMap.GetHashValue(p0.X, p0.Y, p0.Z, ref index);
if (!hasValue)
{
p0i = mesh.AddVertex(new Point3d(p0.X, p0.Y, p0.Z));
hashMap.SetHashValue(p0.X, p0.Y, p0.Z, p0i);
}
else
{
p0i = index;
}
hasValue = hashMap.GetHashValue(p1.X, p1.Y, p1.Z, ref index);
if (!hasValue)
{
p1i = mesh.AddVertex(new Point3d(p1.X, p1.Y, p1.Z));
hashMap.SetHashValue(p1.X, p1.Y, p1.Z, p1i);
}
else
{
p1i = index;
}
hasValue = hashMap.GetHashValue(p2.X, p2.Y, p2.Z, ref index);
if (!hasValue)
{
p2i = mesh.AddVertex(new Point3d(p2.X, p2.Y, p2.Z));
hashMap.SetHashValue(p2.X, p2.Y, p2.Z, p2i);
}
else
{
p2i = index;
}
Triangle t = new Triangle(p0i, p1i, p2i);
mesh.AddFace(t);
}
public Mesh GeneratorSurface()
{
int Width = bmp.width;
int Height = bmp.height;
int Depth = bmp.depth;
Int16Triple[] adjPoints6 = new Int16Triple[6];
MeshBuilder_IntegerVertex mb = new MeshBuilder_IntegerVertex(bmp.width, bmp.height, bmp.depth);
for (int k = 0; k <= Depth - 1; k++)
{
for (int j = 0; j <= Height - 1; j++)
{
for (int i = 0; i <= Width - 1; i++)
{
if (IsInside(i, j, k))
{
Int16Triple p = new Int16Triple(i, j, k);
InitAdj6(adjPoints6, p);
for (int r = 0; r < adjPoints6.Length; r++)
{
Int16Triple t = adjPoints6[r];
if (!IsInside(t.X, t.Y, t.Z))
{
ExtractSquare(r, p, mb);
}
}
}
}
}
}
Mesh m = mb.GetMesh();
for (int i = 0; i < m.Vertices.Count; i++)
{
Point3d p = m.Vertices[i];
p.X -= 0.5f;
p.Y -= 0.5f;
p.Z -= 0.5f;
}//若需要真实位置，则都得平移回去
return(m);
}