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Site local placement (#240)

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* ifcgeom: Add placement_rel_to for convert()

Change geometry conversion in `convert()` for `ObjectPlacement` such
that we can stop the `PlacementRelTo()` recursion when we hit an
`ObjectPlacement` that places a certain type, e.g. a `IfcSite'.

Introduce a new IteratorSetting `SITE_LOCAL_PLACEMENT` which will be
exposed in `IfcConvert`.

* IfcConvert: Add --site-local-placement

Some IFC authoring tools may put the global origo at a large distance
away from the actual building geometry. Also, the global X- and Y-axes
may be at arbitrary angles with natural building axes. Using
--center-model or --model-offset may place the converted geometry closer
to origo, but will still use the global IFC definition of axis
directions. Also, in a scenario with multiple IFC files for one
construction site, using --center-model on each of them would not
generate consistent geometry across OBJ or DAE files.

Solve this by introducing --site-local-placement which will disregard
the ObjectPlacement at the IfcSite level.
This commit is contained in:
Anders Granskogen Bjørnstad
2017-08-19 17:21:10 +02:00
committed by Thomas Krijnen
parent 7bea054c1e
commit 475b8554a8
5 changed files with 39 additions and 5 deletions
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src/ifcgeom/IfcGeomIterator.h
+3
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@@ -755,6 +755,9 @@ namespace IfcGeom {
kernel.setValue(IfcGeom::Kernel::GV_MAX_FACES_TO_SEW, settings.get(IteratorSettings::SEW_SHELLS) ? 1000 : -1);
kernel.setValue(IfcGeom::Kernel::GV_DIMENSIONALITY, (settings.get(IteratorSettings::INCLUDE_CURVES)
? (settings.get(IteratorSettings::EXCLUDE_SOLIDS_AND_SURFACES) ? -1. : 0.) : +1.));
if (settings.get(IteratorSettings::SITE_LOCAL_PLACEMENT)) {
kernel.set_conversion_placement_rel_to(IfcSchema::Type::IfcSite);
}
}
bool owns_ifc_file;