Glassvision/IfcOpenShell
1
0
Fork 0
mirror of https://github.com/IfcOpenShell/IfcOpenShell.git synced 2026-08-14 11:24:19 +00:00
Code Issues Packages Projects Releases Wiki Activity

- IfcGeom: Major performance improvement by only sewing faces of IfcConnectedFaceSets when needed for boolean operations

Browse Source 
- Automatic tests for several well known IFC files on the Internet
- IfcBlender: Make visibility in render consistent with 3d view
- Some compatibility for Ifc2x files with IfcShapeRepresentations and RepresentationIdentifier 'IAI'
This commit is contained in:
Thomas Krijnen
2012-03-01 21:17:06 +00:00
parent a9a5f8dc69
commit 2b27b86b34
7 changed files with 395 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/ifcgeom/IfcGeomFunctions.cpp
+46 -6
View File
@@ -82,6 +82,40 @@
#include "../ifcgeom/IfcGeom.h"
bool IfcGeom::create_solid_from_compound(const TopoDS_Shape& compound, TopoDS_Shape& shape) {
BRepOffsetAPI_Sewing builder;
builder.SetTolerance(0.01);
TopExp_Explorer exp(compound,TopAbs_FACE);
if ( ! exp.More() ) return false;
for ( ; exp.More(); exp.Next() ) {
TopoDS_Face face = TopoDS::Face(exp.Current());
builder.Add(face);
}
builder.Perform();
shape = builder.SewedShape();
try {
ShapeFix_Solid sf_solid;
sf_solid.LimitTolerance(0.01);
shape = sf_solid.SolidFromShell(TopoDS::Shell(shape));
} catch(...) {}
return true;
}
bool IfcGeom::is_compound(const TopoDS_Shape& shape) {
bool has_solids = TopExp_Explorer(shape,TopAbs_SHELL).More() != 0;
bool has_shells = TopExp_Explorer(shape,TopAbs_SHELL).More() != 0;
bool has_compounds = TopExp_Explorer(shape,TopAbs_COMPOUND).More() != 0;
bool has_faces = TopExp_Explorer(shape,TopAbs_FACE).More() != 0;
return has_compounds && has_faces && !has_solids && !has_shells;
}
const TopoDS_Shape& IfcGeom::ensure_fit_for_subtraction(const TopoDS_Shape& shape, TopoDS_Shape& solid) {
const bool is_comp = IfcGeom::is_compound(shape);
if ( ! is_comp ) return shape;
IfcGeom::create_solid_from_compound(shape,solid);
return solid;
}
bool IfcGeom::convert_openings(const Ifc2x3::IfcProduct::ptr entity, const Ifc2x3::IfcRelVoidsElement::list& openings,
const ShapeList& entity_shapes, const gp_Trsf& entity_trsf, ShapeList& cut_shapes) {
// Iterate over IfcOpeningElements
@@ -116,7 +150,8 @@ bool IfcGeom::convert_openings(const Ifc2x3::IfcProduct::ptr entity, const Ifc2x
// Iterate over the shapes of the IfcProduct
for ( IfcGeom::ShapeList::const_iterator it3 = entity_shapes.begin(); it3 != entity_shapes.end(); ++ it3 ) {
const TopoDS_Shape& entity_shape_unlocated = *(it3->second);
TopoDS_Shape entity_shape_solid;
const TopoDS_Shape& entity_shape_unlocated = IfcGeom::ensure_fit_for_subtraction(*(it3->second),entity_shape_solid);
const gp_GTrsf& entity_shape_gtrsf = *(it3->first);
TopoDS_Shape entity_shape;
if ( entity_shape_gtrsf.Form() == gp_Other ) {
@@ -128,7 +163,8 @@ bool IfcGeom::convert_openings(const Ifc2x3::IfcProduct::ptr entity, const Ifc2x
// Iterate over the shapes of the IfcOpeningElements
for ( IfcGeom::ShapeList::const_iterator it4 = opening_shapes.begin(); it4 != opening_shapes.end(); ++ it4 ) {
const TopoDS_Shape& opening_shape_unlocated = *(it4->second);
TopoDS_Shape opening_shape_solid;
const TopoDS_Shape& opening_shape_unlocated = IfcGeom::ensure_fit_for_subtraction(*(it4->second),opening_shape_solid);
const gp_GTrsf& opening_shape_gtrsf = *(it4->first);
if ( opening_shape_gtrsf.Form() == gp_Other ) {
Ifc::LogMessage("warning","Applying non uniform transformation to opening of:",entity->entity);
@@ -143,12 +179,16 @@ bool IfcGeom::convert_openings(const Ifc2x3::IfcProduct::ptr entity, const Ifc2x
const float original_shape_volume = shape_volume(entity_shape);
entity_shape = BRepAlgoAPI_Cut(entity_shape,opening_shape);
BRepAlgoAPI_Cut brep_cut(entity_shape,opening_shape);
if ( brep_cut.IsDone() ) {
entity_shape = brep_cut;
const float volume_after_subtraction = shape_volume(entity_shape);
const float volume_after_subtraction = shape_volume(entity_shape);
if ( ALMOST_THE_SAME(original_shape_volume,volume_after_subtraction) )
Ifc::LogMessage("warning","Warning subtraction yields unchanged volume:",entity->entity);
if ( ALMOST_THE_SAME(original_shape_volume,volume_after_subtraction) )
Ifc::LogMessage("warning","Warning subtraction yields unchanged volume:",entity->entity);
}
}
cut_shapes.push_back(IfcGeom::LocationShape(new gp_GTrsf(),new TopoDS_Shape(entity_shape)));
}