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Handle missing or invalid unit and precision information more gracefully during IfcGeomObject initialization

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This commit is contained in:
aothms
2014-03-22 12:56:08 +00:00
parent ba0ba1973a
commit ffe1eddb00
1 changed files with 49 additions and 30 deletions
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src/ifcgeom/IfcGeomObjects.cpp
+49 -30
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@@ -598,28 +598,36 @@ double UnitPrefixToValue( IfcSchema::IfcSIPrefix::IfcSIPrefix v ) {
}
void IfcGeomObjects::InitPrecision() {
IfcSchema::IfcGeometricRepresentationContext::list rep_contexts = ifc_file->EntitiesByType<IfcSchema::IfcGeometricRepresentationContext>();
// Currently, IfcGeometricRepresentationContext aren't used as much as they should be
// in the evaluation of shape representations, hence, we try to find the one with the
// lowest precision. Typically, a value of 1e-5 is encountered. This value is applied
// to all TopoDS_Shapes generated by one of the IfcGeom::convert() functions.
// TODO: Many of the empirically found tolerances should probably be substituted by
// one that is defined in the model file.
double lowest_precision_encountered = std::numeric_limits<double>::infinity();
bool any_precision_encountered = false;
for (IfcSchema::IfcGeometricRepresentationContext::it it = rep_contexts->begin(); it != rep_contexts->end(); ++it) {
IfcSchema::IfcGeometricRepresentationContext* rep_context = *it;
if (rep_context->is(IfcSchema::Type::IfcGeometricRepresentationSubContext)) continue;
if (rep_context->hasPrecision()) {
const double precision = rep_context->Precision();
if (precision < lowest_precision_encountered) {
any_precision_encountered = true;
lowest_precision_encountered = precision;
IfcGeom::SetValue(IfcGeom::GV_PRECISION, 0.00001);
try {
IfcSchema::IfcGeometricRepresentationContext::list rep_contexts = ifc_file->EntitiesByType<IfcSchema::IfcGeometricRepresentationContext>();
// Currently, IfcGeometricRepresentationContext aren't used as much as they should be
// in the evaluation of shape representations, hence, we try to find the one with the
// lowest precision. Typically, a value of 1e-5 is encountered. This value is applied
// to all TopoDS_Shapes generated by one of the IfcGeom::convert() functions.
// TODO: Many of the empirically found tolerances should probably be substituted by
// one that is defined in the model file.
double lowest_precision_encountered = std::numeric_limits<double>::infinity();
bool any_precision_encountered = false;
for (IfcSchema::IfcGeometricRepresentationContext::it it = rep_contexts->begin(); it != rep_contexts->end(); ++it) {
IfcSchema::IfcGeometricRepresentationContext* rep_context = *it;
if (rep_context->is(IfcSchema::Type::IfcGeometricRepresentationSubContext)) continue;
if (rep_context->hasPrecision()) {
const double precision = rep_context->Precision();
if (precision < lowest_precision_encountered) {
any_precision_encountered = true;
lowest_precision_encountered = precision;
}
}
}
}
if (any_precision_encountered) {
IfcGeom::SetValue(IfcGeom::GV_PRECISION, lowest_precision_encountered);
if (any_precision_encountered) {
IfcGeom::SetValue(IfcGeom::GV_PRECISION, lowest_precision_encountered);
}
} catch (const IfcParse::IfcException& ex) {
std::stringstream ss;
ss << "Failed to determine precision value '" << ex.what() << "'";
Logger::Message(Logger::LOG_ERROR, ss.str());
}
}
@@ -633,23 +641,32 @@ void IfcGeomObjects::InitUnits() {
IfcSchema::IfcUnitAssignment::list unit_assignments = ifc_file->EntitiesByType<IfcSchema::IfcUnitAssignment>();
IfcUtil::IfcAbstractSelect::list units = IfcUtil::IfcAbstractSelect::list();
if ( unit_assignments->Size() ) {
IfcSchema::IfcUnitAssignment::ptr unit_assignment = *unit_assignments->begin();
units = unit_assignment->Units();
}
if ( ! units ) {
try {
if ( unit_assignments->Size() ) {
IfcSchema::IfcUnitAssignment::ptr unit_assignment = *unit_assignments->begin();
units = unit_assignment->Units();
}
} catch (const IfcParse::IfcException&) {}
if (!units) {
// No units eh... Since tolerances and deflection are specified internally in meters
// we will try to find another indication of the model size.
IfcSchema::IfcExtrudedAreaSolid::list extrusions = ifc_file->EntitiesByType<IfcSchema::IfcExtrudedAreaSolid>();
if ( ! extrusions->Size() ) return;
double max_height = -1.0f;
for ( IfcSchema::IfcExtrudedAreaSolid::it it = extrusions->begin(); it != extrusions->end(); ++ it ) {
const double depth = (*it)->Depth();
if ( depth > max_height ) max_height = depth;
try {
const double depth = (*it)->Depth();
if ( depth > max_height ) max_height = depth;
} catch (const IfcParse::IfcException&) {}
}
if ( max_height > 100.0f ) {
IfcGeom::SetValue(IfcGeom::GV_LENGTH_UNIT,0.001);
Logger::Message(Logger::LOG_NOTICE, "Guessed length unit to be in millimeters based on extrusion depth");
}
if ( max_height > 100.0f ) IfcGeom::SetValue(IfcGeom::GV_LENGTH_UNIT,0.001);
return;
}
try {
for ( IfcUtil::IfcAbstractSelect::it it = units->begin(); it != units->end(); ++ it ) {
std::string current_unit_name = "";
@@ -691,8 +708,10 @@ void IfcGeomObjects::InitUnits() {
}
}
}
} catch ( IfcParse::IfcException ex ) {
Logger::Message(Logger::LOG_ERROR,ex.what());
} catch (const IfcParse::IfcException& ex) {
std::stringstream ss;
ss << "Failed to determine unit information '" << ex.what() << "'";
Logger::Message(Logger::LOG_ERROR, ss.str());
}
}