Add Scene Author + AuthorTool

Add XFileExporter
Add Collada Triangle+Line export
Fix Obj Comment

code/AssimpPCH.cpp

@@ -88,6 +88,8 @@ ASSIMP_API aiScene::aiScene()
 	, mNumCameras(0)
 	, mCameras(NULL)
 	, mPrivate(new Assimp::ScenePrivateData())
+	, author("Assimp")
+	, authoringTool("Assimp Importer/Exporter")
 	{
 	}
 

code/CMakeLists.txt

@@ -543,6 +543,8 @@ SET( XFile_SRCS
 	XFileImporter.h
 	XFileParser.cpp
 	XFileParser.h
+	XFileExporter.h
+	XFileExporter.cpp
 )
 SOURCE_GROUP( XFile FILES ${XFile_SRCS})
 

code/ColladaExporter.cpp

@@ -151,7 +151,7 @@ void ColladaExporter::WriteFile()
 // Writes the asset header
 void ColladaExporter::WriteHeader()
 {
-	static const float epsilon = 0.000001f;
+	static const float epsilon = 0.00001f;
 	static const aiQuaternion x_rot(aiMatrix3x3( 
 		0, -1,  0,
 		1,  0,  0,
@@ -176,6 +176,7 @@ void ColladaExporter::WriteHeader()
 	aiQuaternion rotation;
 	aiVector3D position;
 	mScene->mRootNode->mTransformation.Decompose(scaling, rotation, position);
+	rotation.Normalize();
 
 	bool add_root_node = false;
 
@@ -229,8 +230,8 @@ void ColladaExporter::WriteHeader()
 	PushTag();
 	mOutput << startstr << "<contributor>" << endstr;
 	PushTag();
-	mOutput << startstr << "<author>Assimp</author>" << endstr;
+	mOutput << startstr << "<author>" << mScene->author.C_Str() << "</author>" << endstr;
-	mOutput << startstr << "<authoring_tool>Assimp Collada Exporter</authoring_tool>" << endstr;
+	mOutput << startstr << "<authoring_tool>" << mScene->authoringTool.C_Str() << "</authoring_tool>" << endstr;
 	PopTag();
 	mOutput << startstr << "</contributor>" << endstr;
 	mOutput << startstr << "<created>" << date_str << "</created>" << endstr;

code/Exporter.cpp

@@ -72,6 +72,7 @@ void GetPostProcessingStepInstanceList(std::vector< BaseProcess* >& out);
 // ------------------------------------------------------------------------------------------------
 // Exporter worker function prototypes. Should not be necessary to #ifndef them, it's just a prototype
 void ExportSceneCollada(const char*,IOSystem*, const aiScene*);
+void ExportSceneXFile(const char*,IOSystem*, const aiScene*);
 void ExportSceneObj(const char*,IOSystem*, const aiScene*);
 void ExportSceneSTL(const char*,IOSystem*, const aiScene*);
 void ExportSceneSTLBinary(const char*,IOSystem*, const aiScene*);
@@ -86,6 +87,10 @@ Exporter::ExportFormatEntry gExporters[] =
 	Exporter::ExportFormatEntry( "collada", "COLLADA - Digital Asset Exchange Schema", "dae", &ExportSceneCollada),
 #endif
 
+#ifndef ASSIMP_BUILD_NO_OBJ_EXPORTER
+	Exporter::ExportFormatEntry( "x", "X Files", "x", &ExportSceneXFile),
+#endif
+
 #ifndef ASSIMP_BUILD_NO_OBJ_EXPORTER
 	Exporter::ExportFormatEntry( "obj", "Wavefront OBJ format", "obj", &ExportSceneObj, 
 		aiProcess_GenSmoothNormals /*| aiProcess_PreTransformVertices */),

code/ObjExporter.h

@@ -38,7 +38,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 ----------------------------------------------------------------------
 */
 
-/** @file ColladaExporter.h
+/** @file ObjExporter.h
  * Declares the exporter class to write a scene to a Collada file
  */
 #ifndef AI_OBJEXPORTER_H_INC

code/XFileExporter.cpp

@@ -0,0 +1,454 @@
+/*
+Open Asset Import Library (assimp)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2012, assimp team
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms, 
+with or without modification, are permitted provided that the 
+following conditions are met:
+
+* Redistributions of source code must retain the above
+  copyright notice, this list of conditions and the
+  following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+  copyright notice, this list of conditions and the
+  following disclaimer in the documentation and/or other
+  materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+  contributors may be used to endorse or promote products
+  derived from this software without specific prior
+  written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+@author: Richard Steffen, 2014
+----------------------------------------------------------------------
+*/
+
+#include "AssimpPCH.h"
+
+#ifndef ASSIMP_BUILD_NO_EXPORT
+#ifndef ASSIMP_BUILD_NO_XFILE_EXPORTER
+#include "XFileExporter.h"
+
+#include "Bitmap.h"
+#include "fast_atof.h"
+#include "SceneCombiner.h" 
+
+#include <ctime>
+#include <set>
+
+using namespace Assimp;
+
+namespace Assimp
+{
+
+// ------------------------------------------------------------------------------------------------
+// Worker function for exporting a scene to Collada. Prototyped and registered in Exporter.cpp
+void ExportSceneXFile(const char* pFile,IOSystem* pIOSystem, const aiScene* pScene)
+{
+	std::string path = "";
+	std::string file = pFile;
+
+	// We need to test both types of folder separators because pIOSystem->getOsSeparator() is not reliable.
+	// Moreover, the path given by some applications is not even consistent with the OS specific type of separator.
+	const char* end_path = std::max(strrchr(pFile, '\\'), strrchr(pFile, '/'));
+
+	if(end_path != NULL) {
+		path = std::string(pFile, end_path + 1 - pFile);
+		file = file.substr(end_path + 1 - pFile, file.npos);
+
+		std::size_t pos = file.find_last_of('.');
+		if(pos != file.npos) {
+			file = file.substr(0, pos);
+		}
+	}
+
+	// invoke the exporter 
+	XFileExporter iDoTheExportThing( pScene, pIOSystem, path, file);
+
+	// we're still here - export successfully completed. Write result to the given IOSYstem
+	boost::scoped_ptr<IOStream> outfile (pIOSystem->Open(pFile,"wt"));
+	if(outfile == NULL) {
+		throw DeadlyExportError("could not open output .dae file: " + std::string(pFile));
+	}
+
+	// XXX maybe use a small wrapper around IOStream that behaves like std::stringstream in order to avoid the extra copy.
+	outfile->Write( iDoTheExportThing.mOutput.str().c_str(), static_cast<size_t>(iDoTheExportThing.mOutput.tellp()),1);
+}
+
+} // end of namespace Assimp
+
+
+// ------------------------------------------------------------------------------------------------
+// Constructor for a specific scene to export
+XFileExporter::XFileExporter( const aiScene* pScene, IOSystem* pIOSystem, const std::string& path, const std::string& file) : mIOSystem(pIOSystem), mPath(path), mFile(file)
+{
+	// make sure that all formatting happens using the standard, C locale and not the user's current locale
+	mOutput.imbue( std::locale("C") );
+
+	mScene = pScene;
+	mSceneOwned = false;
+
+	// set up strings
+	endstr = "\n"; 
+
+	// start writing
+	WriteFile();
+}
+
+// ------------------------------------------------------------------------------------------------
+// Destructor
+XFileExporter::~XFileExporter()
+{
+	if(mSceneOwned) {
+		delete mScene;
+	}
+}
+
+// ------------------------------------------------------------------------------------------------
+// Starts writing the contents
+void XFileExporter::WriteFile()
+{
+	// note, that all realnumber values must be comma separated in x files
+	mOutput.setf(_IOSfixed);
+	mOutput.precision(6); // precission for float
+
+	// entry of writing the file
+	WriteHeader();
+
+	mOutput << startstr << "Frame DXCC_ROOT {" << endstr;
+	PushTag();
+
+	aiMatrix4x4 I; // identity
+	WriteFrameTransform(I);
+
+	WriteNode(mScene->mRootNode);
+	PopTag();
+
+	mOutput << startstr << "}" << endstr;
+}
+
+// ------------------------------------------------------------------------------------------------
+// Writes the asset header
+void XFileExporter::WriteHeader()
+{
+	mOutput << startstr << "xof 0303txt 0032" << endstr;
+	mOutput << endstr;
+	mOutput << startstr << "template Frame {" << endstr;
+	PushTag();
+	mOutput << startstr << "<3d82ab46-62da-11cf-ab39-0020af71e433>" << endstr;
+	mOutput << startstr << "[...]" << endstr;
+	PopTag();
+	mOutput << startstr << "}" << endstr;
+	mOutput << endstr;
+	mOutput << startstr << "template Matrix4x4 {" << endstr;
+	PushTag();
+	mOutput << startstr << "<f6f23f45-7686-11cf-8f52-0040333594a3>" << endstr;
+	mOutput << startstr << "array FLOAT matrix[16];" << endstr;
+	PopTag();
+	mOutput << startstr << "}" << endstr;
+	mOutput << endstr;
+	mOutput << startstr << "template FrameTransformMatrix {" << endstr;
+	PushTag();
+	mOutput << startstr << "<f6f23f41-7686-11cf-8f52-0040333594a3>" << endstr;
+	mOutput << startstr << "Matrix4x4 frameMatrix;" << endstr;
+	PopTag();
+	mOutput << startstr << "}" << endstr;
+	mOutput << endstr;
+	mOutput << startstr << "template Vector {" << endstr;
+	PushTag();
+	mOutput << startstr << "<3d82ab5e-62da-11cf-ab39-0020af71e433>" << endstr;
+	mOutput << startstr << "FLOAT x;" << endstr;
+	mOutput << startstr << "FLOAT y;" << endstr;
+	mOutput << startstr << "FLOAT z;" << endstr;
+	PopTag();
+	mOutput << startstr << "}" << endstr;
+	mOutput << endstr;
+	mOutput << startstr << "template MeshFace {" << endstr;
+	PushTag();
+	mOutput << startstr << "<3d82ab5f-62da-11cf-ab39-0020af71e433>" << endstr;
+	mOutput << startstr << "DWORD nFaceVertexIndices;" << endstr;
+	mOutput << startstr << "array DWORD faceVertexIndices[nFaceVertexIndices];" << endstr;
+	PopTag();
+	mOutput << startstr << "}" << endstr;
+	mOutput << endstr;
+	mOutput << startstr << "template Mesh {" << endstr;
+	PushTag();
+	mOutput << startstr << "<3d82ab44-62da-11cf-ab39-0020af71e433>" << endstr;
+	mOutput << startstr << "DWORD nVertices;" << endstr;
+	mOutput << startstr << "array Vector vertices[nVertices];" << endstr;
+	mOutput << startstr << "DWORD nFaces;" << endstr;
+	mOutput << startstr << "array MeshFace faces[nFaces];" << endstr;
+	mOutput << startstr << "[...]" << endstr;
+	PopTag();
+	mOutput << startstr << "}" << endstr;
+	mOutput << endstr;
+	mOutput << startstr << "template MeshNormals {" << endstr;
+	PushTag();
+	mOutput << startstr << "<f6f23f43-7686-11cf-8f52-0040333594a3>" << endstr;
+	mOutput << startstr << "DWORD nNormals;" << endstr;
+	mOutput << startstr << "array Vector normals[nNormals];" << endstr;
+	mOutput << startstr << "DWORD nFaceNormals;" << endstr;
+	mOutput << startstr << "array MeshFace faceNormals[nFaceNormals];" << endstr;
+	PopTag();
+	mOutput << startstr << "}" << endstr;
+	mOutput << endstr;
+	mOutput << startstr << "template Coords2d {" << endstr;
+	PushTag();
+	mOutput << startstr << "<f6f23f44-7686-11cf-8f52-0040333594a3>" << endstr;
+	mOutput << startstr << "FLOAT u;" << endstr;
+	mOutput << startstr << "FLOAT v;" << endstr;
+	PopTag();
+	mOutput << startstr << "}" << endstr;
+	mOutput << endstr;
+	mOutput << startstr << "template MeshTextureCoords {" << endstr;
+	PushTag();
+	mOutput << startstr << "<f6f23f40-7686-11cf-8f52-0040333594a3>" << endstr;
+	mOutput << startstr << "DWORD nTextureCoords;" << endstr;
+	mOutput << startstr << "array Coords2d textureCoords[nTextureCoords];" << endstr;
+	PopTag();
+	mOutput << startstr << "}" << endstr;
+	mOutput << endstr;
+	mOutput << startstr << "template ColorRGBA {" << endstr;
+	PushTag();
+	mOutput << startstr << "<35ff44e0-6c7c-11cf-8f52-0040333594a3>" << endstr;
+	mOutput << startstr << "FLOAT red;" << endstr;
+	mOutput << startstr << "FLOAT green;" << endstr;
+	mOutput << startstr << "FLOAT blue;" << endstr;
+	mOutput << startstr << "FLOAT alpha;" << endstr;
+	PopTag();
+	mOutput << startstr << "}" << endstr;
+	mOutput << endstr;
+	mOutput << startstr << "template IndexedColor {" << endstr;
+	PushTag();
+	mOutput << startstr << "<1630b820-7842-11cf-8f52-0040333594a3>" << endstr;
+	mOutput << startstr << "DWORD index;" << endstr;
+	mOutput << startstr << "ColorRGBA indexColor;" << endstr;
+	PopTag();
+	mOutput << startstr << "}" << endstr;
+	mOutput << endstr;
+	mOutput << startstr << "template MeshVertexColors {" << endstr;
+	PushTag();
+	mOutput << startstr << "<1630b821-7842-11cf-8f52-0040333594a3>" << endstr;
+	mOutput << startstr << "DWORD nVertexColors;" << endstr;
+	mOutput << startstr << "array IndexedColor vertexColors[nVertexColors];" << endstr;
+	PopTag();
+	mOutput << startstr << "}" << endstr;
+	mOutput << endstr;
+	mOutput << startstr << "template VertexElement {" << endstr;
+	PushTag();
+	mOutput << startstr << "<f752461c-1e23-48f6-b9f8-8350850f336f>" << endstr;
+	mOutput << startstr << "DWORD Type;" << endstr;
+	mOutput << startstr << "DWORD Method;" << endstr;
+	mOutput << startstr << "DWORD Usage;" << endstr;
+	mOutput << startstr << "DWORD UsageIndex;" << endstr;
+	PopTag();
+	mOutput << startstr << "}" << endstr;
+	mOutput << endstr;
+	mOutput << startstr << "template DeclData {" << endstr;
+	PushTag();
+	mOutput << startstr << "<bf22e553-292c-4781-9fea-62bd554bdd93>" << endstr;
+	mOutput << startstr << "DWORD nElements;" << endstr;
+	mOutput << startstr << "array VertexElement Elements[nElements];" << endstr;
+	mOutput << startstr << "DWORD nDWords;" << endstr;
+	mOutput << startstr << "array DWORD data[nDWords];" << endstr;
+	PopTag();
+	mOutput << startstr << "}" << endstr;
+	mOutput << endstr;
+}
+
+
+// Writes the material setup
+void XFileExporter::WriteFrameTransform(aiMatrix4x4& m)
+{
+	mOutput << startstr << "FrameTransformMatrix {" << endstr << " ";
+	PushTag();	
+	mOutput << startstr << m.a1 << "," << m.a2 << "," << m.a3 << "," << m.a4 << ","
+		<< m.b1 << "," << m.b2 << "," << m.b3 << "," << m.b4 << ","
+		<< m.c1 << "," << m.c2 << "," << m.c3 << "," << m.c4 << ","
+		<< m.d1 << "," << m.d2 << "," << m.d3 << "," << m.d4 << ";;" << endstr;	
+	PopTag();
+	mOutput << startstr << "}" << endstr << endstr;
+}
+
+
+// ------------------------------------------------------------------------------------------------
+// Recursively writes the given node
+void XFileExporter::WriteNode( const aiNode* pNode)
+{	
+	mOutput << startstr << "Frame " << pNode->mName.C_Str() << " {" << endstr;
+
+	PushTag();
+
+	aiMatrix4x4 m;// = pNode->mTransformation;
+
+	WriteFrameTransform(m);
+
+	for (size_t i = 0; i < pNode->mNumMeshes; i++)
+		WriteMesh(mScene->mMeshes[pNode->mMeshes[i]]);
+
+	// recursive call the Nodes
+	for (size_t a = 0; a < pNode->mNumChildren; a++)
+		WriteNode( mScene->mRootNode->mChildren[a]);
+
+	PopTag();
+
+	mOutput << startstr << "}" << endstr << endstr;
+}
+
+void XFileExporter::WriteMesh(const aiMesh* mesh)
+{
+	mOutput << startstr << "Mesh " << mesh->mName.C_Str() << "_mShape" << " {" << endstr;
+
+	PushTag();
+
+	// write all the vertices
+	mOutput << startstr << mesh->mNumVertices << ";" << endstr;
+	for (size_t a = 0; a < mesh->mNumVertices; a++)
+	{
+		aiVector3D &v = mesh->mVertices[a];
+		mOutput << startstr << v[0] << ";"<< v[1] << ";" << v[2] << ";";
+		if (a < mesh->mNumVertices - 1)
+			mOutput << "," << endstr;
+		else
+			mOutput << ";" << endstr;
+	}
+
+	// write all the faces
+	mOutput << startstr << mesh->mNumFaces << ";" << endstr;
+	for( size_t a = 0; a < mesh->mNumFaces; ++a )
+	{
+		const aiFace& face = mesh->mFaces[a];
+		mOutput << startstr << face.mNumIndices << ";";
+		// must be counter clockwise triangle
+		//for(int b = face.mNumIndices - 1; b >= 0 ; --b)
+		for(size_t b = 0; b < face.mNumIndices ; ++b)
+		{
+			mOutput << face.mIndices[b];
+			//if (b > 0)
+			if (b<face.mNumIndices-1)
+				mOutput << ",";
+			else
+				mOutput << ";";
+		}
+
+		if (a < mesh->mNumFaces - 1)
+			mOutput << "," << endstr;
+		else
+			mOutput << ";" << endstr;
+	}
+
+	// write normals (every vertex has one)
+	mOutput << endstr;
+	if (mesh->HasNormals())
+	{
+		mOutput << startstr << "MeshNormals {" << endstr;
+		mOutput << startstr << mesh->mNumVertices << ";" << endstr;
+		for (size_t a = 0; a < mesh->mNumVertices; a++)
+		{		
+			aiVector3D &v = mesh->mNormals[a];
+			mOutput << startstr << v[0] << ";"<< v[1] << ";" << v[2] << ";";
+			if (a < mesh->mNumVertices - 1)
+				mOutput << "," << endstr;
+			else
+				mOutput << ";" << endstr;
+		}
+
+		mOutput << startstr << mesh->mNumFaces << ";" << endstr;
+		for (size_t a = 0; a < mesh->mNumFaces; a++)
+		{		
+			const aiFace& face = mesh->mFaces[a];
+			mOutput << startstr << face.mNumIndices << ";";
+
+			//for(int b = face.mNumIndices-1; b >= 0 ; --b)
+			for(size_t b = 0; b < face.mNumIndices ; ++b)
+			{
+				mOutput << face.mIndices[b];
+				//if (b > 0)
+				if (b<face.mNumIndices-1)
+					mOutput << ",";
+				else
+					mOutput << ";";
+			}
+
+			if (a < mesh->mNumFaces-1)
+				mOutput << "," << endstr;
+			else
+				mOutput << ";" << endstr;
+		}
+		mOutput << startstr << "}" << endstr;
+	}
+	
+	// write texture UVs if available
+	if (mesh->HasTextureCoords(0))
+	{		
+		mOutput << startstr << "MeshTextureCoords {"  << endstr;
+		mOutput << startstr << mesh->mNumVertices << ";" << endstr;
+		for (size_t a = 0; a < mesh->mNumVertices; a++)
+		{
+			aiVector3D& uv = mesh->mTextureCoords[0][a]; // uv of first uv layer for the vertex
+			mOutput << uv.x << ";" << uv.y;
+			if (a < mesh->mNumVertices-1)
+				mOutput << ";," << endstr;
+			else
+				mOutput << ";;" << endstr;
+		}
+		mOutput << startstr << "}" << endstr;
+	}
+
+	// write color channel if available
+	if (mesh->HasVertexColors(0))
+	{		
+		mOutput << startstr << "MeshVertexColors {"  << endstr;
+		mOutput << startstr << mesh->mNumVertices << ";" << endstr;
+		for (size_t a = 0; a < mesh->mNumVertices; a++)
+		{
+			aiColor4D& mColors = mesh->mColors[0][a]; // color of first vertex color set for the vertex
+			mOutput << startstr << a << ";" << mColors.r << ";" << mColors.g << ";" << mColors.b << ";" << mColors.a << ";;";
+			if (a < mesh->mNumVertices-1)
+				mOutput << "," << endstr;
+			else
+				mOutput << ";" << endstr;
+		}
+		mOutput << startstr << "}" << endstr;
+	}
+	// test ...
+	else
+	{
+		mOutput << startstr << "MeshVertexColors {"  << endstr;
+		mOutput << startstr << mesh->mNumVertices << ";" << endstr;
+		for (size_t a = 0; a < mesh->mNumVertices; a++)
+		{
+			aiColor4D* mColors = mesh->mColors[a];
+			mOutput << startstr << a << ";0.500000;0.000000;0.000000;0.000000;;";
+			if (a < mesh->mNumVertices-1)
+				mOutput << "," << endstr;
+			else
+				mOutput << ";" << endstr;
+		}
+		mOutput << startstr << "}" << endstr;
+	}
+
+	PopTag();
+	mOutput << startstr << "}" << endstr << endstr;
+
+}
+
+#endif
+#endif
+

code/XFileExporter.h

@@ -0,0 +1,120 @@
+/*
+Open Asset Import Library (assimp)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2012, assimp team
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms, 
+with or without modification, are permitted provided that the 
+following conditions are met:
+
+* Redistributions of source code must retain the above
+  copyright notice, this list of conditions and the
+  following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+  copyright notice, this list of conditions and the
+  following disclaimer in the documentation and/or other
+  materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+  contributors may be used to endorse or promote products
+  derived from this software without specific prior
+  written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+@author: Richard Steffen, 2014
+
+----------------------------------------------------------------------
+*/
+
+/** @file XFileExporter.h
+ * Declares the exporter class to write a scene to a Collada file
+ */
+#ifndef AI_XFILEEXPORTER_H_INC
+#define AI_XFILEEXPORTER_H_INC
+
+#include "../include/assimp/ai_assert.h"
+#include <sstream>
+
+struct aiScene;
+struct aiNode;
+
+namespace Assimp	
+{
+
+/// Helper class to export a given scene to a Collada file. Just for my personal
+/// comfort when implementing it.
+class XFileExporter
+{
+public:
+	/// Constructor for a specific scene to export
+	XFileExporter( const aiScene* pScene, IOSystem* pIOSystem, const std::string& path, const std::string& file);
+
+	/// Destructor
+	virtual ~XFileExporter();
+
+protected:
+	/// Starts writing the contents
+	void WriteFile();	
+
+	/// Writes the asset header
+	void WriteHeader();
+
+	/// write a frame transform
+	void WriteFrameTransform(aiMatrix4x4& m);
+
+	/// Recursively writes the given node
+	void WriteNode( const aiNode* pNode);
+
+	/// write a mesh entry of the scene
+	void WriteMesh(const aiMesh* mesh);
+
+	/// Enters a new xml element, which increases the indentation
+	void PushTag() { startstr.append( "  "); }
+
+	/// Leaves an element, decreasing the indentation
+	void PopTag() { ai_assert( startstr.length() > 1); startstr.erase( startstr.length() - 2); }
+
+public:
+	/// Stringstream to write all output into
+	std::stringstream mOutput;
+
+protected:
+	/// The IOSystem for output
+	IOSystem* mIOSystem;
+
+	/// Path of the directory where the scene will be exported
+	const std::string mPath;
+
+	/// Name of the file (without extension) where the scene will be exported
+	const std::string mFile;
+
+	/// The scene to be written
+	const aiScene* mScene;
+	bool mSceneOwned;
+
+	/// current line start string, contains the current indentation for simple stream insertion
+	std::string startstr;
+	/// current line end string for simple stream insertion
+	std::string endstr;
+  
+protected:
+
+};
+
+}
+
+#endif // !! AI_XFILEEXPORTER_H_INC

include/assimp/scene.h

@@ -375,6 +375,15 @@ struct aiScene
 	*/
 	C_STRUCT aiCamera** mCameras;
 
+
+	/** a string representing the author
+	*/
+	aiString author;
+
+	/** a string representing the authoringtool
+	*/
+	aiString authoringTool;
+
 #ifdef __cplusplus
 
 	//! Default constructor - set everything to 0/NULL