// ------------------------------------------------------------------------------------------------
void DXFImporter::ParseEntities(DXF::LineReader& reader, DXF::FileData& output)
{
// push a new block onto the stack.
output.blocks.push_back( DXF::Block() );
DXF::Block& block = output.blocks.back();
block.name = AI_DXF_ENTITIES_MAGIC_BLOCK;
while( !reader.End() && !reader.Is(0,"ENDSEC")) {
if (reader.Is(0,"POLYLINE")) {
ParsePolyLine(++reader,output);
continue;
}
else if (reader.Is(0,"INSERT")) {
ParseInsertion(++reader,output);
continue;
}
else if (reader.Is(0,"3DFACE") || reader.Is(0,"LINE") || reader.Is(0,"3DLINE")) {
//http://sourceforge.net/tracker/index.php?func=detail&aid=2970566&group_id=226462&atid=1067632
Parse3DFace(++reader, output);
continue;
}
++reader;
}
DefaultLogger::get()->debug((Formatter::format("DXF: got "),
block.lines.size()," polylines and ", block.insertions.size() ," inserted blocks in ENTITIES"
));
}
// ------------------------------------------------------------------------------------------------
void DXFImporter::ParseBlock(DXF::LineReader& reader, DXF::FileData& output)
{
// push a new block onto the stack.
output.blocks.push_back( DXF::Block() );
DXF::Block& block = output.blocks.back();
while( !reader.End() && !reader.Is(0,"ENDBLK")) {
switch(reader.GroupCode()) {
case 2:
block.name = reader.Value();
break;
case 10:
block.base.x = reader.ValueAsFloat();
break;
case 20:
block.base.y = reader.ValueAsFloat();
break;
case 30:
block.base.z = reader.ValueAsFloat();
break;
}
if (reader.Is(0,"POLYLINE")) {
ParsePolyLine(++reader,output);
continue;
}
// XXX is this a valid case?
if (reader.Is(0,"INSERT")) {
DefaultLogger::get()->warn("DXF: INSERT within a BLOCK not currently supported; skipping");
for( ;!reader.End() && !reader.Is(0,"ENDBLK"); ++reader);
break;
}
else if (reader.Is(0,"3DFACE") || reader.Is(0,"LINE") || reader.Is(0,"3DLINE")) {
//http://sourceforge.net/tracker/index.php?func=detail&aid=2970566&group_id=226462&atid=1067632
Parse3DFace(++reader, output);
continue;
}
++reader;
}
}
// ------------------------------------------------------------------------------------------------
void DXFImporter::ParseBlocks(DXF::LineReader& reader, DXF::FileData& output) {
while( !reader.End() && !reader.Is(0,"ENDSEC")) {
if (reader.Is(0,"BLOCK")) {
ParseBlock(++reader,output);
continue;
}
++reader;
}
ASSIMP_LOG_DEBUG_F("DXF: got ", output.blocks.size()," entries in BLOCKS" );
}
// ------------------------------------------------------------------------------------------------
void DXFImporter::ParseBlocks(DXF::LineReader& reader, DXF::FileData& output)
{
while( !reader.End() && !reader.Is(0,"ENDSEC")) {
if (reader.Is(0,"BLOCK")) {
ParseBlock(++reader,output);
continue;
}
++reader;
}
DefaultLogger::get()->debug((Formatter::format("DXF: got "),
output.blocks.size()," entries in BLOCKS"
));
}
void DXFImporter::ParseInsertion(DXF::LineReader& reader, DXF::FileData& output)
{
output.blocks.back().insertions.push_back( DXF::InsertBlock() );
DXF::InsertBlock& bl = output.blocks.back().insertions.back();
while( !reader.End() && !reader.Is(0)) {
switch(reader.GroupCode())
{
// name of referenced block
case 2:
bl.name = reader.Value();
break;
// translation
case 10:
bl.pos.x = reader.ValueAsFloat();
break;
case 20:
bl.pos.y = reader.ValueAsFloat();
break;
case 30:
bl.pos.z = reader.ValueAsFloat();
break;
// scaling
case 41:
bl.scale.x = reader.ValueAsFloat();
break;
case 42:
bl.scale.y = reader.ValueAsFloat();
break;
case 43:
bl.scale.z = reader.ValueAsFloat();
break;
// rotation angle
case 50:
bl.angle = reader.ValueAsFloat();
break;
}
reader++;
}
}
// ------------------------------------------------------------------------------------------------
void DXFImporter::Parse3DFace(DXF::LineReader& reader, DXF::FileData& output)
{
// (note) this is also used for for parsing line entities, so we
// must handle the vertex_count == 2 case as well.
output.blocks.back().lines.push_back( std::shared_ptr<DXF::PolyLine>( new DXF::PolyLine() ) );
DXF::PolyLine& line = *output.blocks.back().lines.back();
aiVector3D vip[4];
aiColor4D clr = AI_DXF_DEFAULT_COLOR;
bool b[4] = {false,false,false,false};
while( !reader.End() ) {
// next entity with a groupcode == 0 is probably already the next vertex or polymesh entity
if (reader.GroupCode() == 0) {
break;
}
switch (reader.GroupCode())
{
// 8 specifies the layer
case 8:
line.layer = reader.Value();
break;
// x position of the first corner
case 10: vip[0].x = reader.ValueAsFloat();
b[2] = true;
break;
// y position of the first corner
case 20: vip[0].y = reader.ValueAsFloat();
b[2] = true;
break;
// z position of the first corner
case 30: vip[0].z = reader.ValueAsFloat();
b[2] = true;
break;
// x position of the second corner
case 11: vip[1].x = reader.ValueAsFloat();
b[3] = true;
break;
// y position of the second corner
case 21: vip[1].y = reader.ValueAsFloat();
b[3] = true;
break;
// z position of the second corner
case 31: vip[1].z = reader.ValueAsFloat();
b[3] = true;
break;
// x position of the third corner
case 12: vip[2].x = reader.ValueAsFloat();
b[0] = true;
break;
// y position of the third corner
case 22: vip[2].y = reader.ValueAsFloat();
b[0] = true;
break;
// z position of the third corner
case 32: vip[2].z = reader.ValueAsFloat();
b[0] = true;
break;
// x position of the fourth corner
case 13: vip[3].x = reader.ValueAsFloat();
b[1] = true;
break;
// y position of the fourth corner
case 23: vip[3].y = reader.ValueAsFloat();
b[1] = true;
break;
// z position of the fourth corner
case 33: vip[3].z = reader.ValueAsFloat();
b[1] = true;
break;
// color
case 62:
clr = g_aclrDxfIndexColors[reader.ValueAsUnsignedInt() % AI_DXF_NUM_INDEX_COLORS];
break;
};
++reader;
}
// the fourth corner may even be identical to the third,
// in this case we treat it as if it didn't exist.
if (vip[3] == vip[2]) {
b[1] = false;
}
// sanity checks to see if we got something meaningful
if ((b[1] && !b[0]) || !b[2] || !b[3]) {
DefaultLogger::get()->warn("DXF: unexpected vertex setup in 3DFACE/LINE/FACE entity; ignoring");
output.blocks.back().lines.pop_back();
return;
}
const unsigned int cnt = (2+(b[0]?1:0)+(b[1]?1:0));
line.counts.push_back(cnt);
for (unsigned int i = 0; i < cnt; ++i) {
line.indices.push_back(static_cast<unsigned int>(line.positions.size()));
line.positions.push_back(vip[i]);
line.colors.push_back(clr);
}
}
// ------------------------------------------------------------------------------------------------
void DXFImporter::ParsePolyLineVertex(DXF::LineReader& reader, DXF::PolyLine& line)
{
unsigned int cnti = 0, flags = 0;
unsigned int indices[4];
aiVector3D out;
aiColor4D clr = AI_DXF_DEFAULT_COLOR;
while( !reader.End() ) {
if (reader.Is(0)) { // SEQEND or another VERTEX
break;
}
switch (reader.GroupCode())
{
case 8:
// layer to which the vertex belongs to - assume that
// this is always the layer the top-level polyline
// entity resides on as well.
if(reader.Value() != line.layer) {
DefaultLogger::get()->warn("DXF: expected vertex to be part of a polyface but the 0x128 flag isn't set");
}
break;
case 70:
flags = reader.ValueAsUnsignedInt();
break;
// VERTEX COORDINATES
case 10: out.x = reader.ValueAsFloat();break;
case 20: out.y = reader.ValueAsFloat();break;
case 30: out.z = reader.ValueAsFloat();break;
// POLYFACE vertex indices
case 71:
case 72:
case 73:
case 74:
if (cnti == 4) {
DefaultLogger::get()->warn("DXF: more than 4 indices per face not supported; ignoring");
break;
}
indices[cnti++] = reader.ValueAsUnsignedInt();
break;
// color
case 62:
clr = g_aclrDxfIndexColors[reader.ValueAsUnsignedInt() % AI_DXF_NUM_INDEX_COLORS];
break;
};
reader++;
}
if (line.flags & DXF_POLYLINE_FLAG_POLYFACEMESH && !(flags & DXF_VERTEX_FLAG_PART_OF_POLYFACE)) {
DefaultLogger::get()->warn("DXF: expected vertex to be part of a polyface but the 0x128 flag isn't set");
}
if (cnti) {
line.counts.push_back(cnti);
for (unsigned int i = 0; i < cnti; ++i) {
// IMPORTANT NOTE: POLYMESH indices are ONE-BASED
if (indices[i] == 0) {
DefaultLogger::get()->warn("DXF: invalid vertex index, indices are one-based.");
--line.counts.back();
continue;
}
line.indices.push_back(indices[i]-1);
}
}
else {
line.positions.push_back(out);
line.colors.push_back(clr);
}
}
// ------------------------------------------------------------------------------------------------
void DXFImporter::ParsePolyLine(DXF::LineReader& reader, DXF::FileData& output)
{
output.blocks.back().lines.push_back( std::shared_ptr<DXF::PolyLine>( new DXF::PolyLine() ) );
DXF::PolyLine& line = *output.blocks.back().lines.back();
unsigned int iguess = 0, vguess = 0;
while( !reader.End() && !reader.Is(0,"ENDSEC")) {
if (reader.Is(0,"VERTEX")) {
ParsePolyLineVertex(++reader,line);
if (reader.Is(0,"SEQEND")) {
break;
}
continue;
}
switch(reader.GroupCode())
{
// flags --- important that we know whether it is a
// polyface mesh or 'just' a line.
case 70:
if (!line.flags) {
line.flags = reader.ValueAsSignedInt();
}
break;
// optional number of vertices
case 71:
vguess = reader.ValueAsSignedInt();
line.positions.reserve(vguess);
break;
// optional number of faces
case 72:
iguess = reader.ValueAsSignedInt();
line.indices.reserve(iguess);
break;
// 8 specifies the layer on which this line is placed on
case 8:
line.layer = reader.Value();
break;
}
reader++;
}
//if (!(line.flags & DXF_POLYLINE_FLAG_POLYFACEMESH)) {
// DefaultLogger::get()->warn((Formatter::format("DXF: polyline not currently supported: "),line.flags));
// output.blocks.back().lines.pop_back();
// return;
//}
if (vguess && line.positions.size() != vguess) {
DefaultLogger::get()->warn((Formatter::format("DXF: unexpected vertex count in polymesh: "),
line.positions.size(),", expected ", vguess
));
}
if (line.flags & DXF_POLYLINE_FLAG_POLYFACEMESH ) {
if (line.positions.size() < 3 || line.indices.size() < 3) {
DefaultLogger::get()->warn("DXF: not enough vertices for polymesh; ignoring");
output.blocks.back().lines.pop_back();
return;
}
// if these numbers are wrong, parsing might have gone wild.
// however, the docs state that applications are not required
// to set the 71 and 72 fields, respectively, to valid values.
// So just fire a warning.
if (iguess && line.counts.size() != iguess) {
DefaultLogger::get()->warn((Formatter::format("DXF: unexpected face count in polymesh: "),
line.counts.size(),", expected ", iguess
));
}
}
else if (!line.indices.size() && !line.counts.size()) {
// a polyline - so there are no indices yet.
size_t guess = line.positions.size() + (line.flags & DXF_POLYLINE_FLAG_CLOSED ? 1 : 0);
line.indices.reserve(guess);
line.counts.reserve(guess/2);
for (unsigned int i = 0; i < line.positions.size()/2; ++i) {
line.indices.push_back(i*2);
line.indices.push_back(i*2+1);
line.counts.push_back(2);
}
// closed polyline?
if (line.flags & DXF_POLYLINE_FLAG_CLOSED) {
line.indices.push_back(static_cast<unsigned int>(line.positions.size()-1));
line.indices.push_back(0);
line.counts.push_back(2);
}
}
}
// ------------------------------------------------------------------------------------------------
void DXFImporter::ParseHeader(DXF::LineReader& reader, DXF::FileData& /*output*/)
{
for( ;!reader.End() && !reader.Is(0,"ENDSEC"); reader++);
}
// ------------------------------------------------------------------------------------------------
void DXFImporter::SkipSection(DXF::LineReader& reader)
{
for( ;!reader.End() && !reader.Is(0,"ENDSEC"); reader++);
}
// ------------------------------------------------------------------------------------------------
// Imports the given file into the given scene structure.
void DXFImporter::InternReadFile( const std::string& pFile,
aiScene* pScene,
IOSystem* pIOHandler)
{
std::shared_ptr<IOStream> file = std::shared_ptr<IOStream>( pIOHandler->Open( pFile) );
// Check whether we can read the file
if( file.get() == NULL) {
throw DeadlyImportError( "Failed to open DXF file " + pFile + "");
}
// check whether this is a binaray DXF file - we can't read binary DXF files :-(
char buff[AI_DXF_BINARY_IDENT_LEN+1] = {0};
file->Read(buff,AI_DXF_BINARY_IDENT_LEN,1);
if (!strncmp(AI_DXF_BINARY_IDENT,buff,AI_DXF_BINARY_IDENT_LEN)) {
throw DeadlyImportError("DXF: Binary files are not supported at the moment");
}
// DXF files can grow very large, so read them via the StreamReader,
// which will choose a suitable strategy.
file->Seek(0,aiOrigin_SET);
StreamReaderLE stream( file );
DXF::LineReader reader (stream);
DXF::FileData output;
// now get all lines of the file and process top-level sections
bool eof = false;
while(!reader.End()) {
// blocks table - these 'build blocks' are later (in ENTITIES)
// referenced an included via INSERT statements.
if (reader.Is(2,"BLOCKS")) {
ParseBlocks(reader,output);
continue;
}
// primary entity table
if (reader.Is(2,"ENTITIES")) {
ParseEntities(reader,output);
continue;
}
// skip unneeded sections entirely to avoid any problems with them
// altogether.
else if (reader.Is(2,"CLASSES") || reader.Is(2,"TABLES")) {
SkipSection(reader);
continue;
}
else if (reader.Is(2,"HEADER")) {
ParseHeader(reader,output);
continue;
}
// comments
else if (reader.Is(999)) {
DefaultLogger::get()->info("DXF Comment: " + reader.Value());
}
// don't read past the official EOF sign
else if (reader.Is(0,"EOF")) {
eof = true;
break;
}
++reader;
}
if (!eof) {
DefaultLogger::get()->warn("DXF: EOF reached, but did not encounter DXF EOF marker");
}
ConvertMeshes(pScene,output);
// Now rotate the whole scene by 90 degrees around the x axis to convert from AutoCAD's to Assimp's coordinate system
pScene->mRootNode->mTransformation = aiMatrix4x4(
1.f,0.f,0.f,0.f,
0.f,0.f,1.f,0.f,
0.f,-1.f,0.f,0.f,
0.f,0.f,0.f,1.f) * pScene->mRootNode->mTransformation;
}