/// <summary>
/// Reads the model in ASCII format from the specified stream.
/// </summary>
private ImportedModelContainer TryReadAscii(Stream stream, StlImportOptions importOptions)
{
using (var reader = new StreamReader(stream, ENCODING, false, 128, true))
{
VertexStructure newStructure = new VertexStructure();
while (!reader.EndOfStream)
{
var line = reader.ReadLine();
if (line == null)
{
continue;
}
line = line.Trim();
if (line.Length == 0 || line.StartsWith("\0") || line.StartsWith("#") || line.StartsWith("!") ||
line.StartsWith("$"))
{
continue;
}
string id, values;
ParseLine(line, out id, out values);
switch (id)
{
// Header.. not needed here
case "solid":
break;
// Geometry data
case "facet":
this.ReadFacet(reader, values, newStructure, importOptions);
break;
// End of file
case "endsolid":
break;
}
}
// Generate result container
ImportedModelContainer result = new ImportedModelContainer(importOptions);
NamedOrGenericKey geoResourceKey = result.GetResourceKey(
RES_KEY_GEO_CLASS, RES_KEY_GEO_NAME);
result.ImportedResources.Add(new ImportedResourceInfo(
geoResourceKey,
() => new GeometryResource(newStructure)));
GenericObject geoObject = new GenericObject(geoResourceKey);
result.Objects.Add(geoObject);
// Append an object which transform the whole coordinate system
ScenePivotObject rootObject = result.CreateAndAddRootObject();
result.ParentChildRelationships.Add(new Tuple <SceneObject, SceneObject>(rootObject, geoObject));
return(result);
}
}
/// <summary>
/// Reads the model from the specified binary stream.
/// </summary>
private ImportedModelContainer TryReadBinary(Stream stream, StlImportOptions importOptions)
{
// Check length
long length = stream.Length;
if (length < 84)
{
throw new SeeingSharpException("Incomplete file (smaller that 84 bytes)");
}
// Read number of triangles
uint numberTriangles = 0;
using (var reader = new BinaryReader(stream, Encoding.GetEncoding("us-ascii"), true))
{
// Read header (is not needed)
// (solid stands for Ascii format)
string header = ENCODING.GetString(reader.ReadBytes(80), 0, 80).Trim();
if (header.StartsWith("solid", StringComparison.OrdinalIgnoreCase))
{
return(null);
}
// Read and check number of triangles
numberTriangles = ReadUInt32(reader);
if (length - 84 != numberTriangles * 50)
{
throw new SeeingSharpException("Incomplete file (smaller that expected byte count)");
}
// Read geometry data
VertexStructure newStructure = new VertexStructure((int)numberTriangles * 3);
newStructure.CreateSurface((int)numberTriangles);
for (int loop = 0; loop < numberTriangles; loop++)
{
this.ReadTriangle(reader, newStructure, importOptions);
}
// Generate result container
ImportedModelContainer result = new ImportedModelContainer(importOptions);
NamedOrGenericKey geoResourceKey = result.GetResourceKey(
RES_KEY_GEO_CLASS, RES_KEY_GEO_NAME);
result.ImportedResources.Add(new ImportedResourceInfo(
geoResourceKey,
() => new GeometryResource(newStructure)));
GenericObject geoObject = new GenericObject(geoResourceKey);
result.Objects.Add(geoObject);
// Append an object which transform the whole coordinate system
ScenePivotObject rootObject = result.CreateAndAddRootObject();
result.ParentChildRelationships.Add(new Tuple <SceneObject, SceneObject>(rootObject, geoObject));
return(result);
}
}
/// <summary>
/// Imports a model from the given file.
/// </summary>
/// <param name="sourceFile">The source file to be loaded.</param>
/// <param name="importOptions">Some configuration for the importer.</param>
public ImportedModelContainer ImportModel(ResourceLink sourceFile, ImportOptions importOptions)
{
// Get import options
XglImportOptions xglImportOptions = importOptions as XglImportOptions;
if (xglImportOptions == null)
{
throw new SeeingSharpException("Invalid import options for ACImporter!");
}
ImportedModelContainer result = new ImportedModelContainer(importOptions);
// Append an object which transform the whole coordinate system
ScenePivotObject rootObject = result.CreateAndAddRootObject();
// Load current model by walking through xml nodes
using (Stream inStream = sourceFile.OpenInputStream())
{
// Handle compressed xgl files (extension zgl)
Stream nextStream = inStream;
if (sourceFile.FileExtension.Equals("zgl", StringComparison.OrdinalIgnoreCase))
{
// Skip the first bytes in case of compression
// see https://github.com/assimp/assimp/blob/master/code/XGLLoader.cpp
inStream.ReadByte();
inStream.ReadByte();
nextStream = new System.IO.Compression.DeflateStream(inStream, CompressionMode.Decompress);
}
// Read all xml data
try
{
using (XmlReader inStreamXml = XmlReader.Create(nextStream, new XmlReaderSettings()
{
CloseInput = false
}))
{
while (inStreamXml.Read())
{
try
{
if (inStreamXml.NodeType != XmlNodeType.Element)
{
continue;
}
switch (inStreamXml.Name)
{
case NODE_NAME_DATA:
break;
case NODE_NAME_BACKGROUND:
break;
case NODE_NAME_LIGHTING:
break;
case NODE_NAME_TEXTURE:
ImportTexture(inStreamXml, result);
break;
case NODE_NAME_MESH:
ImportMesh(inStreamXml, result, xglImportOptions);
break;
case NODE_NAME_OBJECT:
ImportObject(inStreamXml, result, rootObject, xglImportOptions);
break;
default:
break;
}
}
catch (Exception ex)
{
// Get current line and column
int currentLine = 0;
int currentColumn = 0;
IXmlLineInfo lineInfo = inStreamXml as IXmlLineInfo;
if (lineInfo != null)
{
currentLine = lineInfo.LineNumber;
currentColumn = lineInfo.LinePosition;
}
// Throw an exception with more detail where the error was raised originally
throw new SeeingSharpGraphicsException(string.Format(
"Unable to read file {0} because of an error while reading xml at {1}",
sourceFile,
currentLine + ", " + currentColumn), ex);
}
}
}
}
finally
{
if (inStream != nextStream)
{
nextStream.Dispose();
}
}
}
return(result);
}