/// <summary>
/// Save geometries into xml files
/// </summary>
/// <param name="path">xml file path</param>
/// <param name="geometries">geometries</param>
/// <param name="fileSizeLimit">file size limit for each xml file</param>
/// <param name="threshold">threshold of triangle count for mesh decimation</param>
/// <param name="quality">quality for mesh decimation</param>
public static void SaveGeometries(string path, ref Dictionary <string, GeometryStore> geometries, double fileSizeLimit, int threshold, double quality)
{
string baseName = path.Substring(0, path.Length - 4);
// xml content holder
StringBuilder doc = new StringBuilder();
// name index for each output xml file
int nameIndex = 0;
foreach (string globalId in geometries.Keys)
{
// before processing the next geometry, check whether we should output the current document
// reach file size limit. write to file and start a new document
if (doc.Length >= fileSizeLimit)
{
// add end tag
doc.Append("</IfcModel>");
// write to xml file
using (var writer = new StreamWriter(baseName + "_" + nameIndex + ".xml", false, Encoding.UTF8))
{
writer.Write(doc.ToString());
}
doc.Clear();
nameIndex++;
}
// empty document, add the first two lines
if (doc.Length == 0)
{
doc.Append("<?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"yes\"?>\n")
.Append("<IfcModel>\n");
}
var geometry = geometries[globalId];
// add Element start tag
doc.Append(string.Format("\t<Element ElementId=\"{0}\" LevelName=\"\" Name=\"{1}\">\n", geometry.GlobalId, geometry.Name.Replace('"', '\'')));
// an element node can have multiple mesh nodes
for (int i = 0; i < geometry.Meshes.Count; ++i)
{
var meshStore = geometry.Meshes[i];
// add mesh start tag, lod0 start tag, uvs tag(empty), uvindexes tag(empty)
doc.Append(string.Format("\t\t<Mesh ElementId=\"{0}\" Color=\"{1}\" Material=\"\">\n", geometry.GlobalId, meshStore.Color))
.Append("\t\t\t<Lod0>\n")
.Append("\t\t\t\t<UVs />\n")
.Append("\t\t\t\t<UVIndexes />\n");
// decimate mesh if needed
int originTriangleCount = meshStore.Indexes.Count / 3;
if (originTriangleCount >= threshold)
{
Logger.Info("Origin mesh vertice count: {0}, triangle count: {1}", meshStore.Vertexes.Count / 3, originTriangleCount);
int targetTriangleCount = (int)Math.Ceiling(originTriangleCount * quality);
MeshDecimator.Decimate(ref meshStore, targetTriangleCount);
Logger.Info("Decimated mesh vertice count: {0}, triangle count: {1}", meshStore.Vertexes.Count / 3, meshStore.Indexes.Count / 3);
}
// add vertices tag
doc.Append("\t\t\t\t<Vertices>");
foreach (var vertex in meshStore.Vertexes)
{
doc.Append(vertex).Append(",");
}
doc.Remove(doc.Length - 1, 1) // remove the last ","
.Append("</Vertices>\n");
// add pointindexes tag
if (meshStore.Indexes.Count / 3 > 500)
{
Console.WriteLine("face number:{0}", meshStore.Indexes.Count / 3);
}
doc.Append("\t\t\t\t<PointIndexes>");
foreach (var index in meshStore.Indexes)
{
doc.Append(index).Append(",");
}
doc.Remove(doc.Length - 1, 1)
.Append("</PointIndexes>\n");
// end lod0 tag
doc.Append("\t\t\t</Lod0>\n");
// ... can add lod1 lod2 lod3, but currently they are the same so we ignore them
// end this mesh
doc.Append("\t\t</Mesh>\n");
}
// end this geometry
doc.Append("\t</Element>\n");
}
// the last document may not reach the file size limit
if (doc.Length != 0)
{
// add end tag
doc.Append("</IfcModel>");
// write to xml file
using (var writer = new StreamWriter(baseName + "_" + nameIndex + ".xml", false, Encoding.UTF8))
{
writer.Write(doc.ToString());
}
doc.Clear();
}
}
/// <summary>
/// Output geometries (mesh decimated with quality) to xml file.
/// </summary>
/// <param name="path">xml path</param>
/// <param name="geometries">Geometries to output</param>
/// <param name="threshold">Threshold to decimate mesh</param>
/// <param name="quality">Mesh decimation quality</param>
public static void SaveGeometries(string path, ref List <GeometryStore> geometries, int threshold, double quality)
{
// xml content holder
StringBuilder doc = new StringBuilder();
// add first two line
doc.Append("<?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"yes\"?>\n")
.Append("<IfcModel>\n");
foreach (GeometryStore geometry in geometries)
{
// add Element start tag
doc.Append(string.Format("\t<Element ElementId=\"{0}\" LevelName=\"\" Name=\"{1}\">\n", geometry.GlobalId, geometry.Name == null? "": geometry.Name.Replace('"', '\'')));
// an element node can have multiple mesh nodes
for (int i = 0; i < geometry.Meshes.Count; ++i)
{
var meshStore = geometry.Meshes[i];
// add mesh start tag, lod0 start tag, uvs tag(empty), uvindexes tag(empty)
doc.Append(string.Format("\t\t<Mesh ElementId=\"{0}\" Color=\"{1}\" Material=\"\">\n", geometry.GlobalId, meshStore.Color))
.Append("\t\t\t<Lod0>\n")
.Append("\t\t\t\t<UVs />\n")
.Append("\t\t\t\t<UVIndexes />\n");
// decimate mesh
int originTriangleCount = meshStore.Indexes.Count / 3;
if (originTriangleCount > threshold)
{
Logger.Info("Origin mesh vertice count: {0}, triangle count: {1}", meshStore.Vertexes.Count / 3, originTriangleCount);
int targetTriangleCount = (int)Math.Ceiling(originTriangleCount * quality);
MeshDecimator.Decimate(ref meshStore, targetTriangleCount);
Logger.Info("Decimated mesh vertice count: {0}, triangle count: {1}", meshStore.Vertexes.Count / 3, meshStore.Indexes.Count / 3);
}
// add vertices tag
doc.Append("\t\t\t\t<Vertices>");
foreach (var vertex in meshStore.Vertexes)
{
doc.Append(vertex).Append(",");
}
doc.Remove(doc.Length - 1, 1) // remove the last ","
.Append("</Vertices>\n");
// add pointindexes tag
if (meshStore.Indexes.Count / 3 > 500)
{
Console.WriteLine("face number:{0}", meshStore.Indexes.Count / 3);
}
doc.Append("\t\t\t\t<PointIndexes>");
foreach (var index in meshStore.Indexes)
{
doc.Append(index).Append(",");
}
doc.Remove(doc.Length - 1, 1)
.Append("</PointIndexes>\n");
// end lod0 tag
doc.Append("\t\t\t</Lod0>\n");
// ... can add lod1 lod2 lod3, but currently they are the same so we ignore them
// end this mesh
doc.Append("\t\t</Mesh>\n");
}
// end this geometry
doc.Append("\t</Element>\n");
}
// add end tag
doc.Append("</IfcModel>");
// write to xml file
using (var writer = new StreamWriter(path, false, Encoding.UTF8))
{
writer.Write(doc.ToString());
}
}
