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Directly re-use IfcMappedItem triangulated elements when not using world coordinates

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This commit is contained in:
Thomas Krijnen
2016-03-18 11:23:25 +01:00
parent 4a3a0bff71
commit 59d2d227d9
7 changed files with 418 additions and 106 deletions
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src/ifcgeom/IfcGeomHelpers.cpp
+84 -7
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@@ -77,6 +77,53 @@
#include "../ifcgeom/IfcGeom.h"
// Helper functions (re)set gp_(G)Trsf(2d) forms explicitly to 'Identity'
// so that it can be easily identified in the IfcMappedItem processing
// For axis placements detect equality early in order for the
// relatively computionaly expensive gp_Trsf calculation to be skipped
template <typename T>
bool axis_equal(const T& a, const T& b, double tolerance);
template <>
bool axis_equal(const gp_Ax3& a, const gp_Ax3& b, double tolerance) {
if (!a.Location().IsEqual(b.Location(), tolerance)) return false;
// Note that the tolerance below is angular, above is linear. Since architectural
// objects are about 1m'ish in scale, it should be somewhat equivalent. Besides,
// this is mostly a filter for NULL or default values in the placements.
if (!a.Direction().IsEqual(b.Direction(), tolerance)) return false;
if (!a.XDirection().IsEqual(b.XDirection(), tolerance)) return false;
if (!a.YDirection().IsEqual(b.YDirection(), tolerance)) return false;
return true;
}
bool axis_equal(const gp_Ax2d& a, const gp_Ax2d& b, double tolerance) {
if (!a.Location().IsEqual(b.Location(), tolerance)) return false;
if (!a.Direction().IsEqual(b.Direction(), tolerance)) return false;
return true;
}
template <typename T> struct dimension_count {};
template <> struct dimension_count <gp_Trsf2d > { static const int n = 2; };
template <> struct dimension_count <gp_GTrsf2d> { static const int n = 2; };
template <> struct dimension_count < gp_Trsf > { static const int n = 3; };
template <> struct dimension_count < gp_GTrsf > { static const int n = 3; };
template <typename T>
bool is_identity(const T& t, double tolerance) {
// Note the {1, n+1} range due to Open Cascade's 1-based indexing
// Note the {1, n+2} range due to the translation part of the matrix
for (int i = 1; i < dimension_count<T>::n + 2; ++i) {
for (int j = 1; j < dimension_count<T>::n + 1; ++j) {
const double iden_value = i == j ? 1. : 0.;
const double trsf_value = t.Value(j, i);
if (fabs(trsf_value - iden_value) > tolerance) {
return false;
}
}
}
return true;
}
bool IfcGeom::Kernel::convert(const IfcSchema::IfcCartesianPoint* l, gp_Pnt& point) {
IN_CACHE(IfcCartesianPoint,l,gp_Pnt,point)
std::vector<double> xyz = l->Coordinates();
@@ -120,7 +167,11 @@ bool IfcGeom::Kernel::convert(const IfcSchema::IfcAxis2Placement3D* l, gp_Trsf&
gp_Ax3 ax3;
if ( hasRef ) ax3 = gp_Ax3(o,axis,refDirection);
else ax3 = gp_Ax3(o,axis);
trsf.SetTransformation(ax3, gp_Ax3(gp_Pnt(),gp_Dir(0,0,1),gp_Dir(1,0,0)));
if (!axis_equal(ax3, (gp_Ax3) gp::XOY(), getValue(GV_PRECISION))) {
trsf.SetTransformation(ax3, gp::XOY());
}
CACHE(IfcAxis2Placement3D,l,trsf)
return true;
}
@@ -147,9 +198,16 @@ bool IfcGeom::Kernel::convert(const IfcSchema::IfcCartesianTransformationOperato
if ( l->hasAxis3() ) IfcGeom::Kernel::convert(l->Axis3(),axis3);
gp_Ax3 ax3 (origin,axis3,axis1);
if ( axis2.Dot(ax3.YDirection()) < 0 ) ax3.YReverse();
trsf.SetTransformation(ax3);
trsf.Invert();
if ( l->hasScale() ) trsf.SetScaleFactor(l->Scale());
if (!axis_equal(ax3, (gp_Ax3) gp::XOY(), getValue(GV_PRECISION))) {
trsf.SetTransformation(ax3);
trsf.Invert();
}
if (l->hasScale() && !ALMOST_THE_SAME(l->Scale(), 1.)) {
trsf.SetScaleFactor(l->Scale());
}
CACHE(IfcCartesianTransformationOperator3D,l,trsf)
return true;
}
@@ -183,7 +241,12 @@ bool IfcGeom::Kernel::convert(const IfcSchema::IfcCartesianTransformationOperato
}
trsf.Invert();
if ( l->hasScale() ) trsf.SetScaleFactor(l->Scale());
if ( l->hasScale() && !ALMOST_THE_SAME(l->Scale(), 1.) ) trsf.SetScaleFactor(l->Scale());
if (is_identity(trsf, getValue(GV_PRECISION))) {
trsf = gp_Trsf2d();
}
CACHE(IfcCartesianTransformationOperator2D,l,trsf)
return true;
}
@@ -211,6 +274,11 @@ bool IfcGeom::Kernel::convert(const IfcSchema::IfcCartesianTransformationOperato
gtrsf.SetValue(2,2,scale2);
gtrsf.SetValue(3,3,scale3);
gtrsf.PreMultiply(trsf);
if (is_identity(gtrsf, getValue(GV_PRECISION))) {
gtrsf = gp_GTrsf();
}
CACHE(IfcCartesianTransformationOperator3DnonUniform,l,gtrsf)
return true;
}
@@ -247,6 +315,11 @@ bool IfcGeom::Kernel::convert(const IfcSchema::IfcCartesianTransformationOperato
gtrsf.SetValue(1,1,scale1);
gtrsf.SetValue(2,2,scale2);
gtrsf.Multiply(trsf);
if (is_identity(gtrsf, getValue(GV_PRECISION))) {
gtrsf = gp_GTrsf2d();
}
CACHE(IfcCartesianTransformationOperator2DnonUniform,l,gtrsf)
return true;
}
@@ -274,8 +347,12 @@ bool IfcGeom::Kernel::convert(const IfcSchema::IfcAxis2Placement2D* l, gp_Trsf2d
if ( l->hasRefDirection() )
IfcGeom::Kernel::convert(l->RefDirection(),V);
gp_Ax2d axis(gp_Pnt2d(P.X(),P.Y()),gp_Dir2d(V.X(),V.Y()));
trsf.SetTransformation(axis,gp_Ax2d());
gp_Ax2d axis(gp_Pnt2d(P.X(),P.Y()), gp_Dir2d(V.X(),V.Y()));
if (!axis_equal(axis, gp_Ax2d(), getValue(GV_PRECISION))) {
trsf.SetTransformation(axis, gp_Ax2d());
}
CACHE(IfcAxis2Placement2D,l,trsf)
return true;
}