private IXbimShapeGeometryData MeshPolyhedronText(IEnumerable<IEnumerable<IfcFace>> facesList, int entityLabel,float precision)
{
IXbimShapeGeometryData shapeGeometry = new XbimShapeGeometry();
shapeGeometry.Format = (byte)XbimGeometryType.Polyhedron;
using (var ms = new MemoryStream(0x4000))
using (TextWriter textWriter = new StreamWriter(ms))
{
var faceLists = facesList as IList<IEnumerable<IfcFace>> ?? facesList.ToList();
var triangulations = new List<XbimTriangulatedMesh>(faceLists.Count);
foreach (var faceList in faceLists)
triangulations.Add(TriangulateFaces(faceList, entityLabel, precision));
// Write out header
uint verticesCount = 0;
uint triangleCount = 0;
uint facesCount = 0;
var boundingBox = XbimRect3D.Empty;
foreach (var triangulatedMesh in triangulations)
{
verticesCount += triangulatedMesh.VertexCount;
triangleCount += triangulatedMesh.TriangleCount;
facesCount += (uint)triangulatedMesh.Faces.Count;
if (boundingBox.IsEmpty) boundingBox = triangulatedMesh.BoundingBox;
else boundingBox.Union(triangulatedMesh.BoundingBox);
}
textWriter.WriteLine("P {0} {1} {2} {3} {4}", 2, verticesCount, facesCount, triangleCount, 0);
//write out vertices and normals
textWriter.Write("V");
foreach (var p in triangulations.SelectMany(t => t.Vertices))
textWriter.Write(" {0},{1},{2}", p.X, p.Y, p.Z);
textWriter.WriteLine();
//now write out the faces
uint verticesOffset = 0;
foreach (var triangulatedMesh in triangulations)
{
foreach (var faceGroup in triangulatedMesh.Faces)
{
textWriter.Write("T");
int currentNormal = -1;
foreach (var triangle in faceGroup.Value)
{
var pn1 = triangle[0].PackedNormal.ToUnit16();
var pn2 = triangle[0].NextEdge.PackedNormal.ToUnit16();
var pn3 = triangle[0].NextEdge.NextEdge.PackedNormal.ToUnit16();
if (pn1 != currentNormal)
{
textWriter.Write(" {0}/{1},", triangle[0].StartVertexIndex + verticesOffset, pn1);
currentNormal = pn1;
}
else
textWriter.Write(" {0},", triangle[0].StartVertexIndex + verticesOffset);
if (pn1 != pn2)
{
textWriter.Write("{0}/{1},", triangle[0].NextEdge.StartVertexIndex + verticesOffset, pn2);
currentNormal = pn2;
}
else
textWriter.Write("{0},", triangle[0].NextEdge.StartVertexIndex + verticesOffset);
if (pn2 != pn3)
{
textWriter.Write("{0}/{1}", triangle[0].NextEdge.NextEdge.StartVertexIndex + verticesOffset, pn3);
currentNormal = pn3;
}
else
textWriter.Write("{0}", triangle[0].NextEdge.NextEdge.StartVertexIndex + verticesOffset);
}
textWriter.WriteLine();
}
verticesOffset += triangulatedMesh.VertexCount;
}
textWriter.Flush();
shapeGeometry.BoundingBox = boundingBox.ToFloatArray();
shapeGeometry.ShapeData = ms.ToArray();
}
return shapeGeometry;
}
private void WriteShapeGeometry(JsonWriter writer, XbimShapeGeometry geom, XbimMatrix3D? transform = null)
{
XbimMeshGeometry3D mesh = new XbimMeshGeometry3D();
mesh.Read(geom.ShapeData, transform);
writer.WritePropertyName("positions");
writer.WriteStartArray();
foreach (var point in mesh.Positions)
{
writer.WriteValue(Math.Round(point.X,4)); //we are converting to metres so this is effectively .1mm
writer.WriteValue(Math.Round(point.Y,4));
writer.WriteValue(Math.Round(point.Z,4));
}
writer.WriteEndArray();
writer.WritePropertyName("indices");
writer.WriteStartArray();
foreach (var idx in mesh.TriangleIndices)
{
writer.WriteValue(idx);
}
writer.WriteEndArray();
writer.WritePropertyName("normals");
writer.WriteStartArray();
foreach (var norm in mesh.Normals)
{
writer.WriteValue(norm.X);
writer.WriteValue(norm.Y);
writer.WriteValue(norm.Z);
}
writer.WriteEndArray();
}
private IXbimShapeGeometryData MeshPolyhedronBinary(IEnumerable<IEnumerable<IfcFace>> facesList, int entityLabel, float precision)
{
IXbimShapeGeometryData shapeGeometry = new XbimShapeGeometry();
shapeGeometry.Format = (byte)XbimGeometryType.PolyhedronBinary;
using (var ms = new MemoryStream(0x4000))
using (var binaryWriter = new BinaryWriter(ms))
{
var faceLists = facesList as IList<IEnumerable<IfcFace>> ?? facesList.ToList();
var triangulations = new List<XbimTriangulatedMesh>(faceLists.Count);
foreach (var faceList in faceLists)
triangulations.Add(TriangulateFaces(faceList, entityLabel, precision));
// Write out header
uint verticesCount = 0;
uint triangleCount = 0;
uint facesCount = 0;
var boundingBox = XbimRect3D.Empty;
foreach (var triangulatedMesh in triangulations)
{
verticesCount += triangulatedMesh.VertexCount;
triangleCount += triangulatedMesh.TriangleCount;
facesCount += (uint)triangulatedMesh.Faces.Count;
if (boundingBox.IsEmpty) boundingBox = triangulatedMesh.BoundingBox;
else boundingBox.Union(triangulatedMesh.BoundingBox);
}
binaryWriter.Write((byte)1); //stream format version
// ReSharper disable once RedundantCast
binaryWriter.Write((UInt32)verticesCount); //number of vertices
binaryWriter.Write(triangleCount); //number of triangles
foreach (var v in triangulations.SelectMany(t=>t.Vertices))
{
binaryWriter.Write(v.X);
binaryWriter.Write(v.Y);
binaryWriter.Write(v.Z);
}
shapeGeometry.BoundingBox = boundingBox.ToFloatArray();
//now write out the faces
binaryWriter.Write(facesCount);
uint verticesOffset = 0;
int invalidNormal = ushort.MaxValue; ;
foreach (var triangulatedMesh in triangulations)
{
foreach (var faceGroup in triangulatedMesh.Faces)
{
var numTrianglesInFace = faceGroup.Value.Count;
//we need to fix this
var planar = invalidNormal != faceGroup.Key; //we have a mesh of faces that all have the same normals at their vertices
if (!planar) numTrianglesInFace *= -1; //set flag to say multiple normals
binaryWriter.Write((Int32)numTrianglesInFace);
bool first = true;
foreach (var triangle in faceGroup.Value)
{
if (planar && first)
{
triangle[0].PackedNormal.Write(binaryWriter);
first = false;
}
WriteIndex(binaryWriter, (uint)triangle[0].StartVertexIndex + verticesOffset, verticesCount);
if (!planar)
triangle[0].PackedNormal.Write(binaryWriter);
WriteIndex(binaryWriter, (uint)triangle[0].NextEdge.StartVertexIndex + verticesOffset, verticesCount);
if (!planar) triangle[0].NextEdge.PackedNormal.Write(binaryWriter);
WriteIndex(binaryWriter, (uint)triangle[0].NextEdge.NextEdge.StartVertexIndex + verticesOffset,
verticesCount);
if (!planar) triangle[0].NextEdge.NextEdge.PackedNormal.Write(binaryWriter);
}
}
verticesOffset += triangulatedMesh.VertexCount;
}
binaryWriter.Flush();
shapeGeometry.ShapeData = ms.ToArray();
}
return shapeGeometry;
}
