Add StepExporter.cpp(stp) Export

Fix XFile

CREDITS

@@ -153,6 +153,8 @@ Ogre Binary format support
 Android JNI asset extraction support
 
 - Richard Steffen
-Contributed X File exporter
 Contributed ExportProperties interface
+Contributed X File exporter
+Contributed Step (stp) exporter
+
 

code/CMakeLists.txt

@@ -579,6 +579,12 @@ SET( XFile_SRCS
 )
 SOURCE_GROUP( XFile FILES ${XFile_SRCS})
 
+SET( Step_SRCS
+	StepExporter.h
+	StepExporter.cpp
+)
+SOURCE_GROUP( Step FILES ${Step_SRCS})
+
 SET( Exporter_SRCS
 	Exporter.cpp
 	AssimpCExport.cpp
@@ -716,6 +722,7 @@ SET( assimp_src
 	${Terragen_SRCS}
 	${Unreal_SRCS}
 	${XFile_SRCS}
+	${Step_SRCS}
 	${Extra_SRCS}
 	${MS3D_SRCS}
 	${COB_SRCS}

code/Exporter.cpp

@@ -73,7 +73,8 @@ void GetPostProcessingStepInstanceList(std::vector< BaseProcess* >& out);
 // Exporter worker function prototypes. Should not be necessary to #ifndef them, it's just a prototype
 // do not use const, because some exporter need to convert the scene temporary
 void ExportSceneCollada(const char*,IOSystem*, const aiScene*, const ExportProperties*);
-void ExportSceneXFile(const char*,IOSystem*, const aiScene*, const ExportProperties*); 
+void ExportSceneXFile(const char*,IOSystem*, const aiScene*, const ExportProperties*);
+void ExportSceneStep(const char*,IOSystem*, const aiScene*, const ExportProperties*);
 void ExportSceneObj(const char*,IOSystem*, const aiScene*, const ExportProperties*);
 void ExportSceneSTL(const char*,IOSystem*, const aiScene*, const ExportProperties*);
 void ExportSceneSTLBinary(const char*,IOSystem*, const aiScene*, const ExportProperties*);
@@ -96,6 +97,10 @@ Exporter::ExportFormatEntry gExporters[] =
 		aiProcess_MakeLeftHanded | aiProcess_FlipWindingOrder | aiProcess_FlipUVs),
 #endif
 
+#ifndef ASSIMP_BUILD_NO_STEP_EXPORTER
+	Exporter::ExportFormatEntry( "stp", "Step Files", "stp", &ExportSceneStep, 0),
+#endif
+
 #ifndef ASSIMP_BUILD_NO_OBJ_EXPORTER
 	Exporter::ExportFormatEntry( "obj", "Wavefront OBJ format", "obj", &ExportSceneObj, 
 		aiProcess_GenSmoothNormals /*| aiProcess_PreTransformVertices */),

code/ProcessHelper.cpp

@@ -94,6 +94,26 @@ void FindMeshCenter (aiMesh* mesh, aiVector3D& out, aiVector3D& min, aiVector3D&
 	out = min + (max-min)*0.5f;
 }
 
+// -------------------------------------------------------------------------------
+void FindSceneCenter (aiScene* scene, aiVector3D& out, aiVector3D& min, aiVector3D& max)
+{
+	if (scene->mNumMeshes == 0) return;
+	FindMeshCenter(scene->mMeshes[0], out, min, max);
+	for (int i = 1; i < scene->mNumMeshes; ++i)
+	{
+		aiVector3D tout, tmin, tmax;
+		FindMeshCenter(scene->mMeshes[i], tout, tmin, tmax);
+		if (min[0] > tmin[0]) min[0] = tmin[0];
+		if (min[1] > tmin[1]) min[1] = tmin[1];
+		if (min[2] > tmin[2]) min[2] = tmin[2];
+		if (max[0] < tmax[0]) max[0] = tmax[0];
+		if (max[1] < tmax[1]) max[1] = tmax[1];
+		if (max[2] < tmax[2]) max[2] = tmax[2];
+	}
+	out = min + (max-min)*0.5f;
+}
+
+
 // -------------------------------------------------------------------------------
 void FindMeshCenterTransformed (aiMesh* mesh, aiVector3D& out, aiVector3D& min,
 	aiVector3D& max, const aiMatrix4x4& m)

code/ProcessHelper.h

@@ -258,6 +258,16 @@ void FindAABBTransformed (const aiMesh* mesh, aiVector3D& min, aiVector3D& max,
  *  @param[out] out Center point */
 void FindMeshCenter (aiMesh* mesh, aiVector3D& out, aiVector3D& min, aiVector3D& max);
 
+// -------------------------------------------------------------------------------
+/** @brief Helper function to determine the 'real' center of a scene
+ *
+ *  That is the center of its axis-aligned bounding box.
+ *  @param scene Input scene
+ *  @param[out] min Minimum vertex of the scene
+ *  @param[out] max maximum vertex of the scene
+ *  @param[out] out Center point */
+void FindSceneCenter (aiScene* scene, aiVector3D& out, aiVector3D& min, aiVector3D& max);
+
 
 // -------------------------------------------------------------------------------
 // Helper function to determine the 'real' center of a mesh after applying a given transform

code/StepExporter.cpp

@@ -0,0 +1,374 @@
+/*
+Open Asset Import Library (assimp)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2015, 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, 2015
+----------------------------------------------------------------------
+*/
+
+#include "AssimpPCH.h"
+
+#ifndef ASSIMP_BUILD_NO_EXPORT
+#ifndef ASSIMP_BUILD_NO_STEP_EXPORTER
+#include "StepExporter.h"
+#include "ConvertToLHProcess.h"
+#include "Bitmap.h"
+#include "fast_atof.h"
+#include "SceneCombiner.h" 
+
+#include <ctime>
+#include <set>
+#include <map>
+#include <list>
+
+/* Tested with Step viewer v4 from www.ida-step.net */
+
+using namespace Assimp;
+
+namespace Assimp
+{
+
+// ------------------------------------------------------------------------------------------------
+// Worker function for exporting a scene to Collada. Prototyped and registered in Exporter.cpp
+void ExportSceneStep(const char* pFile,IOSystem* pIOSystem, const aiScene* pScene, const ExportProperties* pProperties)
+{
+	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);
+		}
+	}
+
+	// create/copy Properties
+	ExportProperties props(*pProperties);
+
+	// set standard properties if not set
+	//if (!props.HasPropertyBool(AI_CONFIG_EXPORT_XFILE_64BIT)) props.SetPropertyBool(AI_CONFIG_EXPORT_XFILE_64BIT, false);
+
+	// invoke the exporter 
+	StepExporter iDoTheExportThing( pScene, pIOSystem, path, file, &props);
+
+	// 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 .stp 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
+
+
+namespace {
+inline uint64_t toIndexHash(int32_t id1, int32_t id2)
+{
+	// dont wonder that -1/-1 -> hash=-1
+    uint64_t hash = (uint32_t) id1;
+    hash = (hash << 32);
+    hash += (uint32_t) id2;
+    return hash;
+}
+
+inline void fromIndexHash(uint64_t hash, int32_t &id1, int32_t &id2)
+{
+    id1 = (hash & 0xFFFFFFFF00000000) >> 32;
+    id2 = (hash & 0xFFFFFFFF);
+}
+
+// Collect world transformations for each node
+	void CollectTrafos(const aiNode* node, std::map<const aiNode*, aiMatrix4x4>& trafos) {
+		const aiMatrix4x4& parent = node->mParent ? trafos[node->mParent] : aiMatrix4x4();
+		trafos[node] = parent * node->mTransformation;
+		for (unsigned int i = 0; i < node->mNumChildren; ++i) {
+			CollectTrafos(node->mChildren[i], trafos);
+		}
+	}
+
+	// Generate a flat list of the meshes (by index) assigned to each node
+	void CollectMeshes(const aiNode* node, std::multimap<const aiNode*, unsigned int>& meshes) {
+		for (unsigned int i = 0; i < node->mNumMeshes; ++i) {
+			meshes.insert(std::make_pair(node, node->mMeshes[i]));
+		}
+		for (unsigned int i = 0; i < node->mNumChildren; ++i) {
+			CollectMeshes(node->mChildren[i], meshes);
+		}
+	}
+}
+
+// ------------------------------------------------------------------------------------------------
+// Constructor for a specific scene to export
+StepExporter::StepExporter(const aiScene* pScene, IOSystem* pIOSystem, const std::string& path, const std::string& file, const ExportProperties* pProperties) : mIOSystem(pIOSystem), mPath(path), mFile(file), mProperties(pProperties)
+{
+	CollectTrafos(pScene->mRootNode, trafos);
+	CollectMeshes(pScene->mRootNode, meshes);
+
+	// make sure that all formatting happens using the standard, C locale and not the user's current locale
+	mOutput.imbue( std::locale("C") );
+
+	mFile = std::string(file);
+	mPath = std::string(path);
+	mScene = pScene;
+	mSceneOwned = false;
+
+	// set up strings
+	endstr = ";\n"; 
+
+	// start writing
+	WriteFile();
+
+
+
+}
+
+// ------------------------------------------------------------------------------------------------
+// Destructor
+StepExporter::~StepExporter()
+{
+	if(mSceneOwned) {
+		delete mScene;
+	}
+}
+
+// ------------------------------------------------------------------------------------------------
+// Starts writing the contents
+void StepExporter::WriteFile()
+{
+	// see http://shodhganga.inflibnet.ac.in:8080/jspui/bitstream/10603/14116/11/11_chapter%203.pdf
+	// note, that all realnumber values must be comma separated in x files
+	mOutput.setf(std::ios::fixed);
+	mOutput.precision(16); // precission for double
+
+	aiMatrix4x4 baseTransform = mScene->mRootNode->mTransformation;
+
+	int ind = 100; // the start index to be used
+	int faceEntryLen = 30; // number of entries for a triangle/face
+	// prepare unique (count triangles and vertices)
+	std::map<aiVector3D*, int> uniqueVerts; // use a map to reduce find complexity to log(n)
+	std::map<aiVector3D*, int>::iterator it;
+	int countFace = 0;
+
+	for (unsigned int i=0; i<mScene->mNumMeshes; ++i)
+	{
+		aiMesh* mesh = mScene->mMeshes[i];		
+		for (unsigned int j=0; j<mesh->mNumFaces; ++j)
+		{
+			aiFace* face = &(mesh->mFaces[j]);
+
+			if (face->mNumIndices == 3) countFace++;
+		}
+		for (unsigned int j=0; j<mesh->mNumVertices; ++j)
+		{
+			aiVector3D* v = &(mesh->mVertices[j]);
+			it =uniqueVerts.find(v); 
+			if (it == uniqueVerts.end())
+			{
+				uniqueVerts[v] = -1; // first mark the vector as not transformed
+			}
+		}
+	}
+
+	// write the header	
+	mOutput << "ISO-10303-21" << endstr;
+	mOutput << "HEADER" << endstr;
+	mOutput << "FILE_DESCRIPTION(('STEP AP214'),'1')" << endstr;
+	mOutput << "FILE_NAME('" << mFile << ".stp','2015-04-23T09:26:41',(' '),(' '),'Spatial InterOp 3D',' ',' ')" << endstr;
+	mOutput << "FILE_SCHEMA(('automotive_design'))" << endstr;
+	mOutput << "ENDSEC" << endstr;
+
+	// write the top of data
+	mOutput << "DATA" << endstr;
+	mOutput << "#1=MECHANICAL_DESIGN_GEOMETRIC_PRESENTATION_REPRESENTATION(' ',(";
+	for (int i=0; i<countFace; ++i)
+	{
+		mOutput << "#" << i*faceEntryLen + ind + 2*uniqueVerts.size();
+		if (i!=countFace-1) mOutput << ",";
+	}
+	mOutput << "),#6)" << endstr;
+
+	mOutput << "#2=PRODUCT_DEFINITION_CONTEXT('',#7,'design')" << endstr;
+	mOutput << "#3=APPLICATION_PROTOCOL_DEFINITION('INTERNATIONAL STANDARD','automotive_design',1994,#7)" << endstr;
+	mOutput << "#4=PRODUCT_CATEGORY_RELATIONSHIP('NONE','NONE',#8,#9)" << endstr;
+	mOutput << "#5=SHAPE_DEFINITION_REPRESENTATION(#10,#11)" << endstr;
+	mOutput << "#6= (GEOMETRIC_REPRESENTATION_CONTEXT(3)GLOBAL_UNCERTAINTY_ASSIGNED_CONTEXT((#12))GLOBAL_UNIT_ASSIGNED_CONTEXT((#13,#14,#15))REPRESENTATION_CONTEXT('NONE','WORKSPACE'))" << endstr;
+	mOutput << "#7=APPLICATION_CONTEXT(' ')" << endstr;
+	mOutput << "#8=PRODUCT_CATEGORY('part','NONE')" << endstr;
+	mOutput << "#9=PRODUCT_RELATED_PRODUCT_CATEGORY('detail',' ',(#17))" << endstr;
+	mOutput << "#10=PRODUCT_DEFINITION_SHAPE('NONE','NONE',#18)" << endstr;
+	mOutput << "#11=MANIFOLD_SURFACE_SHAPE_REPRESENTATION('Root',(#16,#19),#6)" << endstr;
+	mOutput << "#12=UNCERTAINTY_MEASURE_WITH_UNIT(LENGTH_MEASURE(1.0E-006),#13,'','')" << endstr;
+	mOutput << "#13=(CONVERSION_BASED_UNIT('METRE',#20)LENGTH_UNIT()NAMED_UNIT(#21))" << endstr;
+	mOutput << "#14=(NAMED_UNIT(#22)PLANE_ANGLE_UNIT()SI_UNIT($,.RADIAN.))" << endstr;
+	mOutput << "#15=(NAMED_UNIT(#22)SOLID_ANGLE_UNIT()SI_UNIT($,.STERADIAN.))" << endstr;
+	mOutput << "#16=SHELL_BASED_SURFACE_MODEL('Root',(#29))" << endstr;
+	mOutput << "#17=PRODUCT('Root','Root','Root',(#23))" << endstr;
+	mOutput << "#18=PRODUCT_DEFINITION('NONE','NONE',#24,#2)" << endstr;
+	mOutput << "#19=AXIS2_PLACEMENT_3D('',#25,#26,#27)" << endstr;
+	mOutput << "#20=LENGTH_MEASURE_WITH_UNIT(LENGTH_MEASURE(1.0),#28)" << endstr;
+	mOutput << "#21=DIMENSIONAL_EXPONENTS(1.0,0.0,0.0,0.0,0.0,0.0,0.0)" << endstr;
+	mOutput << "#22=DIMENSIONAL_EXPONENTS(0.0,0.0,0.0,0.0,0.0,0.0,0.0)" << endstr;
+	mOutput << "#23=PRODUCT_CONTEXT('',#7,'mechanical')" << endstr;
+	mOutput << "#24=PRODUCT_DEFINITION_FORMATION_WITH_SPECIFIED_SOURCE(' ','NONE',#17,.NOT_KNOWN.)" << endstr;
+	mOutput << "#25=CARTESIAN_POINT('',(0.0,0.0,0.0))" << endstr;
+	mOutput << "#26=DIRECTION('',(0.0,0.0,1.0))" << endstr;
+	mOutput << "#27=DIRECTION('',(1.0,0.0,0.0))" << endstr;	
+
+	mOutput << "#28= (NAMED_UNIT(#21)LENGTH_UNIT()SI_UNIT(.MILLI.,.METRE.))" << endstr;
+
+
+	mOutput << "#29=CLOSED_SHELL('',(";
+	for (int i=0; i<countFace; ++i)
+	{
+		mOutput << "#" << i*faceEntryLen + ind + 2*uniqueVerts.size() + 8;
+		if (i!=countFace-1) mOutput << ",";
+	}
+	mOutput << "))" << endstr;
+
+	// write all the unique transformed CARTESIAN and VERTEX
+	for (MeshesByNodeMap::const_iterator it2 = meshes.begin(); it2 != meshes.end(); it2++)
+	{
+		const aiNode& node = *(*it2).first;
+		unsigned int mesh_idx = (*it2).second;
+
+		const aiMesh* mesh = mScene->mMeshes[mesh_idx];
+		aiMatrix4x4& trafo = trafos[&node];
+		for (unsigned int i = 0; i < mesh->mNumVertices; ++i)
+		{
+			aiVector3D* v = &(mesh->mVertices[i]);
+			it = uniqueVerts.find(v);
+			if (it->second >=0 ) continue;
+			it->second = ind; // this one is new, so set the index (ind)
+			aiVector3D vt = trafo * (*v); // transform the coordinate
+			mOutput << "#" << it->second << "=CARTESIAN_POINT('',(" << vt.x << "," << vt.y << "," << vt.z << "))" << endstr;
+			mOutput << "#" << it->second+1 << "=VERTEX_POINT('',#" << it->second << ")" << endstr;
+			ind += 2;
+		}
+	}
+
+	// write the triangles
+	for (unsigned int i=0; i<mScene->mNumMeshes; ++i)
+	{
+		aiMesh* mesh = mScene->mMeshes[i];		
+		for (unsigned int j=0; j<mesh->mNumFaces; ++j)
+		{
+			aiFace* face = &(mesh->mFaces[j]);
+
+			if (face->mNumIndices != 3) continue;
+	
+			aiVector3D* v1 = &(mesh->mVertices[face->mIndices[0]]);
+			aiVector3D* v2 = &(mesh->mVertices[face->mIndices[1]]);
+			aiVector3D* v3 = &(mesh->mVertices[face->mIndices[2]]);
+			aiVector3D dv12 = *v2 - *v1;
+			aiVector3D dv23 = *v3 - *v2;
+			aiVector3D dv31 = *v1 - *v3;
+			aiVector3D dv13 = *v3 - *v1;
+			dv12.Normalize();
+			dv23.Normalize();
+			dv31.Normalize();
+			dv13.Normalize();
+
+			int pid1 = uniqueVerts.find(v1)->second;
+			int pid2 = uniqueVerts.find(v2)->second;
+			int pid3 = uniqueVerts.find(v3)->second;
+
+			int sid = ind; // the sub index		
+			mOutput << "#" << sid << "=STYLED_ITEM('',(#" << sid+1 << "),#" << sid+8 << ")" << endstr; /* the item that must be referenced in #1 */
+			/* This is the color information of the Triangle */
+			mOutput << "#" << sid+1 << "=PRESENTATION_STYLE_ASSIGNMENT((#" << sid+2 << "))" << endstr;
+			mOutput << "#" << sid+2 << "=SURFACE_STYLE_USAGE(.BOTH.,#" << sid+3 << ")" << endstr;
+			mOutput << "#" << sid+3 << "=SURFACE_SIDE_STYLE('',(#" << sid+4 << "))" << endstr;
+			mOutput << "#" << sid+4 << "=SURFACE_STYLE_FILL_AREA(#" << sid+5 << ")" << endstr;
+			mOutput << "#" << sid+5 << "=FILL_AREA_STYLE('',(#" << sid+6 << "))" << endstr;
+			mOutput << "#" << sid+6 << "=FILL_AREA_STYLE_COLOUR('',#" << sid+7 << ")" << endstr;
+			mOutput << "#" << sid+7 << "=COLOUR_RGB('',0.0,0.0,1.0)" << endstr;
+
+			/* this is the geometry */
+			mOutput << "#" << sid+8 << "=FACE_SURFACE('',(#" << sid+13 << "),#" << sid+9<< ",.T.)" << endstr; /* the face that must be referenced in 29 */
+
+			/* 2 directions of the plane */
+			mOutput << "#" << sid+9 << "=PLANE('',#" << sid+10 << ")" << endstr;
+			mOutput << "#" << sid+10 << "=AXIS2_PLACEMENT_3D('',#" << pid1 << ", #" << sid+11 << ",#" << sid+12 << ")" << endstr;									
+
+			mOutput << "#" << sid+11 << "=DIRECTION('',(" << dv12.x << "," << dv12.y << "," << dv12.z << "))" << endstr;
+			mOutput << "#" << sid+12 << "=DIRECTION('',(" << dv13.x << "," << dv13.y << "," << dv13.z << "))" << endstr;
+
+			mOutput << "#" << sid+13 << "=FACE_BOUND('',#" << sid+14 << ",.T.)" << endstr;
+			mOutput << "#" << sid+14 << "=EDGE_LOOP('',(#" << sid+15 << ",#" << sid+16 << ",#" << sid+17 << "))" << endstr;
+
+			/* edge loop  */
+			mOutput << "#" << sid+15 << "=ORIENTED_EDGE('',*,*,#" << sid+18 << ",.T.)" << endstr;
+			mOutput << "#" << sid+16 << "=ORIENTED_EDGE('',*,*,#" << sid+19 << ",.T.)" << endstr;
+			mOutput << "#" << sid+17 << "=ORIENTED_EDGE('',*,*,#" << sid+20 << ",.T.)" << endstr;
+
+			/* oriented edges */
+			mOutput << "#" << sid+18 << "=EDGE_CURVE('',#" << pid1+1 << ",#" << pid2+1 << ",#" << sid+21 << ",.F.)" << endstr;
+			mOutput << "#" << sid+19 << "=EDGE_CURVE('',#" << pid2+1 << ",#" << pid3+1 << ",#" << sid+22 << ",.T.)" << endstr;
+			mOutput << "#" << sid+20 << "=EDGE_CURVE('',#" << pid3+1 << ",#" << pid1+1 << ",#" << sid+23 << ",.T.)" << endstr;
+
+			/* 3 lines and 3 vectors for the lines for the 3 edge curves */
+			mOutput << "#" << sid+21 << "=LINE('',#" << pid1 << ",#" << sid+24 << ")" << endstr;
+			mOutput << "#" << sid+22 << "=LINE('',#" << pid2 << ",#" << sid+25 << ")" << endstr;
+			mOutput << "#" << sid+23 << "=LINE('',#" << pid3 << ",#" << sid+26 << ")" << endstr;
+			mOutput << "#" << sid+24 << "=VECTOR('',#" << sid+27 << ",1.0)" << endstr;
+			mOutput << "#" << sid+25 << "=VECTOR('',#" << sid+28 << ",1.0)" << endstr;
+			mOutput << "#" << sid+26 << "=VECTOR('',#" << sid+29 << ",1.0)" << endstr;
+			mOutput << "#" << sid+27 << "=DIRECTION('',(" << dv12.x << "," << dv12.y << "," << dv12.z << "))" << endstr;
+			mOutput << "#" << sid+28 << "=DIRECTION('',(" << dv23.x << "," << dv23.y << "," << dv23.z << "))" << endstr;
+			mOutput << "#" << sid+29 << "=DIRECTION('',(" << dv31.x << "," << dv31.y << "," << dv31.z << "))" << endstr;
+			ind += faceEntryLen; // increase counter
+		}
+	}
+		
+	mOutput << "ENDSEC" << endstr; // end of data section	
+	mOutput << "END-ISO-10303-21" << endstr; // end of file
+}
+
+
+
+#endif
+#endif
+

code/StepExporter.h

@@ -0,0 +1,108 @@
+/*
+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 StepExporter.h
+ * Declares the exporter class to write a scene to a Collada file
+ */
+#ifndef AI_STEPEXPORTER_H_INC
+#define AI_STEPEXPORTER_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 StepFile.
+/// Note: an StepFile uses a left hand system. Assimp used a right hand system (OpenGL), therefore we have to transform everything
+class StepExporter
+{
+public:
+	/// Constructor for a specific scene to export
+	StepExporter(const aiScene* pScene, IOSystem* pIOSystem, const std::string& path, const std::string& file, const ExportProperties* pProperties);
+
+	/// Destructor
+	virtual ~StepExporter();
+
+protected:
+	/// Starts writing the contents
+	void WriteFile();	
+
+public:
+
+	/// Stringstream to write all output into
+	std::stringstream mOutput;
+
+protected:
+
+	/// hold the properties pointer
+	const ExportProperties* mProperties;	
+
+	/// The IOSystem for output
+	IOSystem* mIOSystem;
+
+	/// Name of the file (without extension) where the scene will be exported
+	std::string mFile;
+
+	/// Path of the directory where the scene will be exported
+	std::string mPath;	
+
+	/// The scene to be written
+	const aiScene* mScene;
+	bool mSceneOwned;
+
+	/// current line end string for simple stream insertion
+	std::string endstr;
+
+	std::map<const aiNode*, aiMatrix4x4> trafos;
+
+	typedef std::multimap<const aiNode*, unsigned int> MeshesByNodeMap;
+	MeshesByNodeMap meshes;
+
+};
+
+}
+
+#endif // !! AI_STEPEXPORTER_H_INC

code/XFileExporter.cpp

@@ -319,8 +319,8 @@ void XFileExporter::WriteNode( aiNode* pNode)
 		WriteMesh(mScene->mMeshes[pNode->mMeshes[i]]);
 
 	// recursive call the Nodes
-	for (size_t a = 0; a < pNode->mNumChildren; a++)
-		WriteNode( mScene->mRootNode->mChildren[a]);
+	for (size_t i = 0; i < pNode->mNumChildren; ++i)
+		WriteNode( mScene->mRootNode->mChildren[i]);
 
 	PopTag();
 
@@ -507,12 +507,16 @@ void XFileExporter::WriteMesh(aiMesh* mesh)
 
 std::string XFileExporter::toXFileString(aiString &name)
 {
-	std::string str = std::string(name.C_Str());
-	std::replace(str.begin(), str.end(), '<', '_');
-	std::replace(str.begin(), str.end(), '>', '_');
-	std::replace(str.begin(), str.end(), '{', '_');
-	std::replace(str.begin(), str.end(), '}', '_');
-	std::replace(str.begin(), str.end(), '$', '_');
+	std::string pref = "NN_"; // node name prefix to prevent unexpected start of string
+	std::string str = pref + std::string(name.C_Str());	
+	for (int i=0; i<str.length(); ++i)
+	{
+		if ((str[i] >= 48 && str[i] <= 57) || // 0-9
+			(str[i] >= 65 && str[i] <= 90) || // A-Z
+			(str[i] >= 97 && str[i] <= 122)) // a-z
+			continue;
+		str[i] = '_';
+	}
 	return str;
 }
 

code/XFileExporter.h

@@ -122,8 +122,6 @@ protected:
 	/// current line end string for simple stream insertion
 	std::string endstr;
   
-protected:
-
 };
 
 }