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Implements IfcSegmentReferenceCurve and cant

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This commit is contained in:
Richard Brice
2024-03-27 13:30:53 -07:00
parent 960a59da84
commit 83a127b570
2 changed files with 426 additions and 306 deletions
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src/ifcgeom/mapping/IfcCurveSegment.cpp
+423 -305
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@@ -35,7 +35,6 @@ using namespace ifcopenshell::geometry;
namespace { namespace {
// @todo: rb is there a common math library these functions can be moved to? // @todo: rb is there a common math library these functions can be moved to?
auto sign = [](double v) -> int { return v < 0 ? -1 : 1; }; // returns -1 or 1 auto sign = [](double v) -> int { return v < 0 ? -1 : 1; }; // returns -1 or 1
auto binary_sign = [](double v) -> int { return v < 0 ? -1 : (0 < v ? 1 : 0); }; // returns -1, 0, or 1
// @todo change the calculation at end of this to std::lerp when upgrading to C++ 20 // @todo change the calculation at end of this to std::lerp when upgrading to C++ 20
template <typename T> template <typename T>
@@ -82,7 +81,7 @@ static const double PI = boost::math::constants::pi<double>();
// function to specialize the refinement of the placement at u. // function to specialize the refinement of the placement at u.
class segment_geometry_adjuster { class segment_geometry_adjuster {
public: public:
segment_geometry_adjuster(mapping* mapping, segment_type_t segment_type,const IfcSchema::IfcCurveSegment* inst, const IfcSchema::IfcCurveSegment* next_inst) : segment_geometry_adjuster(mapping* mapping, const IfcSchema::IfcCurveSegment* inst, const IfcSchema::IfcCurveSegment* next_inst) :
end_of_inst_(Eigen::Matrix4d::Identity()), end_of_inst_(Eigen::Matrix4d::Identity()),
start_of_next_inst_(Eigen::Matrix4d::Identity()), start_of_next_inst_(Eigen::Matrix4d::Identity()),
transition_code_(inst->Transition()) transition_code_(inst->Transition())
@@ -140,7 +139,7 @@ class segment_geometry_adjuster {
// Transforms the ParentCurve geometry with the IfcCurveSegment.Placement and // Transforms the ParentCurve geometry with the IfcCurveSegment.Placement and
// applies geometric adjustments to the geometry, if enabled // applies geometric adjustments to the geometry, if enabled
Eigen::Matrix4d transform_and_adjust(double u, const Eigen::Matrix4d& parent_curve_point) const { virtual Eigen::Matrix4d transform_and_adjust(double u, const Eigen::Matrix4d& parent_curve_point) const {
// transform the parent curve's value into the segment curve's coordinate system // transform the parent curve's value into the segment curve's coordinate system
Eigen::Matrix4d segment_curve_point = transformation_matrix_ * parent_curve_point; Eigen::Matrix4d segment_curve_point = transformation_matrix_ * parent_curve_point;
if (adjustments_) { if (adjustments_) {
@@ -149,14 +148,16 @@ class segment_geometry_adjuster {
return segment_curve_point; return segment_curve_point;
} }
const Eigen::Matrix4d& get_placement() const { return transformation_matrix_; }
protected: protected:
// precompute any values that are constant when applying geometry adjustments // precompute any values that are constant when applying geometry adjustments
//( subclasses to override. // (subclasses to override as needed).
virtual void init_adjustments() { /*do nothing*/ virtual void init_adjustments() { /*do nothing*/ }
}
// Applies geometric adjustment to the segment curve point evaluated at u // Applies geometric adjustment to the segment curve point evaluated at u
// This default implementation does nothing // This default implementation does nothing
virtual void apply_adjustments(double u, Eigen::Matrix4d& p) const { /* do nothing - override in subclass if needed */ } virtual void apply_adjustments(double /*u*/, Eigen::Matrix4d& /*p*/) const { /* do nothing - override in subclass if needed */ }
const Eigen::Matrix4d& get_end_of_segment() const { return end_of_inst_; } const Eigen::Matrix4d& get_end_of_segment() const { return end_of_inst_; }
const Eigen::Matrix4d& get_start_of_next_segment() const { return start_of_next_inst_; } const Eigen::Matrix4d& get_start_of_next_segment() const { return start_of_next_inst_; }
@@ -179,13 +180,13 @@ class linear_segment_geometry_adjuster : public segment_geometry_adjuster {
using segment_geometry_adjuster::segment_geometry_adjuster; using segment_geometry_adjuster::segment_geometry_adjuster;
protected: protected:
virtual void init_adjustments() override { void init_adjustments() override {
// @todo: rb - implement to improve efficiency // @todo: rb - implement to improve efficiency
// cache delta = (start_next - end_this)/length // cache delta = (start_next - end_this)/length
// adjustment is then adj = u*delta // adjustment is then adj = u*delta
} }
virtual void apply_adjustments(double u, Eigen::Matrix4d& p) const override { void apply_adjustments(double u, Eigen::Matrix4d& p) const override {
// make the adjustments based on the transition code // make the adjustments based on the transition code
// all segments must connect end to end except for last segment IfcTransitionCode_DISCONTINUOUS for open curve // all segments must connect end to end except for last segment IfcTransitionCode_DISCONTINUOUS for open curve
auto transition_code = get_transition_code(); auto transition_code = get_transition_code();
@@ -224,89 +225,68 @@ class linear_segment_geometry_adjuster : public segment_geometry_adjuster {
}; };
// specializes segment_geometry_adjuster for cant segments. // specializes segment_geometry_adjuster for cant segments.
// The specification for IfcSegmentedReferenceCurve provides the requirements for class cant_adjuster : public GEOMETRY_ADJUSTER {
// how the cant deviates from the base curve and how the cant transitions over
// the length of an IfcCurveSegment. The exact requirements are unclear. For this
// reason, the following implementation may not conform with the IFC specification.
//
// https://standards.buildingsmart.org/IFC/RELEASE/IFC4_3/HTML/lexical/IfcSegmentedReferenceCurve.htm
//
// The treatment of cant geometry is as follows in this class:
// 1) Superelevation (depression or elevation) from the axis of the base curve.
// From 8.9.3.62
// "A deviating explicit position of a curve segment (IfcCurveSegment.Placement) from the axis of the base
// curve produces a superelevation i.e. depression or elevation from the axis of the base curve."
//
// Nothing in the specification indicates that the deviation from the axis of the base curve is to be interpolated.
// However, this would result in the cant elevation deviation being constant along each segment and there would
// potentially be abrupt changes in elevation at segment boundaries.
//
// To address this, the cant at a point along a segment is interpolated between IfcCurveSegment.Placement.Location.Y for placement
// at the start of the current segment and the start of the next segment. If there is not a next segment, the optional
// IfcSegmentedReferenceCurve.EndPoint attribute is used if present.
//
// For simplicity in matrix operations, the Location.Z values are also interpolated. Though, they can reasonably be
// expected to be 0.0 because cant is, in part, a vertical deviation from the IfcGradientCurve basis.
//
// 2) Determination of Axis and RefDirection
// From 8.9.3.62
// "The superelevation rate of change is directly proportionate to the curve segment parent curve curvature gradient
// equation (IfcCurveSegment.ParentCurve) in the linear parameter space of the base curve. If no deviation in the position
// of the curve segment to the base curve axis is specified, the axes (Axis and RefDirection) directions of IfcAxis2Placement
// are interpolated between the initial curve segment placement and the placement of the subsequent curve segment."
//
// This seems to say that the type of the IfcCurveSegment.ParentCurve is related to the rate of change of the Axis and RefDirection
// vectors along the length of the segment. The rate of change is understood to be equal to the derivative of the curvature of
// the IfcCurve subtype.
//
// However, if the IfcCureSegment.Placement does not deviate from the basic curve (which occurs with a deviation of 0.0), ignore
// the IfcCurveSegment.ParentCurve type and linearly interpolate the Axis and RefDirection vectors from the stat of this and
// the next segment.
//
// For now, the derivative of the curvature of the IfcCurve subtype is difficult to implement and example models from the IFC spec
// always use IfcAxis2Placement3D with Axis and RefDirection specified, the basic interpolation is used, ignoring the IfcCurve type.
//
// This implementation will be revised as the understanding of IfcSegmentedReferenceCurve improves.
class cant_adjuster : public segment_geometry_adjuster {
public: public:
using segment_geometry_adjuster::segment_geometry_adjuster; using GEOMETRY_ADJUSTER::GEOMETRY_ADJUSTER;
virtual void transform_and_adjust(double u, Eigen::Matrix4d& p) const { Eigen::Matrix4d transform_and_adjust(double u, const Eigen::Matrix4d& parent_curve_point) const override {
// don't call parent class version // Consider a line connection two rails. The upwards vector normal to that line is used to define
// the cant tilt. For no tilt, the vector is upwards so the tilt angle is PI/2.
// If the left rail is higher than the right angle, the tilt is clockwise and the tilt angle is less than PI/2
// The cant (D) and half the railhead distance is needed to compute the tilt angle.
// tan(tilt_angle) = 2*D/rail_head_distance
//
// However, the rail head distance is not known from the geometric definition. It is only known in the
// business logic definition.
//
// From the geometric definition, the cant and tilt angle are known at both ends of the segment.
// From this, the rail head distance can be computed as follows:
//
// Get the placement at the start of this segment and the start of the next segment
auto& start_this = get_start_of_segment(); auto& start_this = get_start_of_segment();
auto& start_next = get_start_of_next_segment(); auto& start_next = get_start_of_next_segment();
auto l = get_length();
// tilt angle of vector normal to cant at start of this and start of next segment // Get the cant at the start of this and the next segment
auto start_cant = start_this.col(3)(1);
auto next_cant = start_next.col(3)(1);
// Compute the tilt angle at start of this and start of next segment
// This is the angle of the normal vector to the line connecting the rail heads
auto tilt_start_this = atan2(start_this.col(2)(2), start_this.col(2)(1)); auto tilt_start_this = atan2(start_this.col(2)(2), start_this.col(2)(1));
auto tilt_start_next = atan2(start_next.col(2)(2), start_next.col(2)(1)); auto tilt_start_next = atan2(start_next.col(2)(2), start_next.col(2)(1));
// tilt angle of vector normal to cant at u assuming linear interpolation // Compute half the rail head distance
// @todo: rb - rate of change of slope is related to curve type (such as clothoid or line) // Cant is measured half way between rails, so it is easier to work with half the rail head distance
// need to somehow account for that - it is important when tilt at start of next isn't provided // Need to do this calculation with a non-zero cant value. The tilt angle is PI/2 for zero cant
// because it defines how much tilt_start_this varies along the length // and the tangent of PI/2 is infinity - not helpful
auto tilt = tilt_start_this + (tilt_start_next - tilt_start_this) * u / l; double h;
if (start_cant) {
h = start_cant * tan(tilt_start_this);
} else {
h = next_cant * tan(tilt_start_next);
}
// use linear interpolation to compute elevation change due to cant // Get the cant from the parent curve point
auto st = start_this.col(3)(1); // Using the cant and half the rail head distance, compute the tilt angle
auto sn = start_next.col(3)(1); // For cant tilt toward the left (CCW rotation), the tilt angle used to
auto slope = (sn - st) / l; // compute h is greater than PI/2 and the tangent of that angle is negative.
// For this reason, use fabs(h) so tilt is between 0 and PI
double cant = parent_curve_point.col(3)(1);
auto tilt = atan2(fabs(h), cant);
// RefDirection.z is due to cant elevation change slope // Create a transformation matrix
p.col(0)(2) = slope; Eigen::Matrix4d m = Eigen::Matrix4d::Identity();
p.col(0).normalize(); m.col(2)(1) = cos(tilt);
m.col(2)(2) = sin(tilt);
// populate Axis vector // apply cant tilt to the parent curve point
p.col(2)(0) = -slope; Eigen::Matrix4d p = m * parent_curve_point;
p.col(2)(1) = cos(tilt);
p.col(2)(2) = sin(tilt);
p.col(2).normalize();
// Axis X RefDirection = Y return p;
p.col(1).head<3>() = p.col(2).head<3>().cross(p.col(0).head<3>());
auto result = st + u * slope; // apply the base class transformation, which is just applying the IfcCurveSegment placement
p.col(3)(1) = result; //return GEOMETRY_ADJUSTER::transform_and_adjust(u, p);
} }
protected: protected:
@@ -342,30 +322,29 @@ typedef boost::mpl::vector<
class curve_segment_evaluator { class curve_segment_evaluator {
private: private:
mapping* mapping_; mapping* mapping_ = nullptr;
const IfcSchema::IfcCurveSegment* inst_; const IfcSchema::IfcCurveSegment* inst_ = nullptr; // this curve segment instance
const IfcSchema::IfcCurveSegment* next_inst_; const IfcSchema::IfcCurveSegment* next_inst_ = nullptr; // next curve segment instance, if it exists
double length_unit_; double length_unit_;
double start_; double start_;
double length_; double length_; // length along the curve, as provided from the IfcCurveSegment
segment_type_t segment_type_; segment_type_t segment_type_;
const IfcSchema::IfcCurve* curve_; const IfcSchema::IfcCurve* parent_curve_ = nullptr;
double projected_length_; double projected_length_; // for vertical segments, this is the length of curve projected onto the "Distance Along" axis
std::shared_ptr<segment_geometry_adjuster> geometry_adjuster; std::shared_ptr<segment_geometry_adjuster> geometry_adjuster_; // object that positions the segment using the IfcCurveSegment.Placement and makes geometry adjustments
std::optional<std::function<Eigen::Matrix4d(double)>> eval_; std::optional<std::function<Eigen::Matrix4d(double)>> eval_; // function for the curve. Function takes distances along, u, and returns the 4x4 position matrix
public: public:
// First constructor, takes parameters from IfcCurveSegment
curve_segment_evaluator(mapping* mapping, const IfcSchema::IfcCurveSegment* inst, const IfcSchema::IfcCurveSegment* next_inst, double length_unit, segment_type_t segment_type) curve_segment_evaluator(mapping* mapping, const IfcSchema::IfcCurveSegment* inst, const IfcSchema::IfcCurveSegment* next_inst, double length_unit, segment_type_t segment_type)
: mapping_(mapping), : mapping_(mapping),
inst_(inst), inst_(inst),
next_inst_(next_inst), next_inst_(next_inst),
length_unit_(length_unit), length_unit_(length_unit),
segment_type_(segment_type), segment_type_(segment_type),
curve_(inst->ParentCurve()) { parent_curve_(inst->ParentCurve()) {
if (!inst->SegmentStart()->as<IfcSchema::IfcLengthMeasure>() || !inst->SegmentLength()->as<IfcSchema::IfcLengthMeasure>()) { if (!inst->SegmentStart()->as<IfcSchema::IfcLengthMeasure>() || !inst->SegmentLength()->as<IfcSchema::IfcLengthMeasure>()) {
// @nb Parameter values are forbidden in the specification until parametrization is provided for all spirals // @nb Parameter values are forbidden in the specification until parametrization is provided for all spirals
@@ -394,25 +373,25 @@ class curve_segment_evaluator {
// of geometry_adjuster are disabled, eval_ is called to get the unadjusted end point // of geometry_adjuster are disabled, eval_ is called to get the unadjusted end point
// of this segment, the geometry_adjuster is updated with the end point so it can // of this segment, the geometry_adjuster is updated with the end point so it can
// compute and apply geometry adjustments. // compute and apply geometry adjustments.
if (eval_ && geometry_adjuster) { if (eval_ && geometry_adjuster_) {
geometry_adjuster->enable_adjustments(false); // disable adjustments geometry_adjuster_->enable_adjustments(false); // disable adjustments
auto end_point = (*eval_)(fabs(length_)); // compute the end point without correction auto end_point = (*eval_)(fabs(length_)); // compute the end point without correction
geometry_adjuster->set_segment_end_point(end_point); // save the unadjusted end point it can be used to compute adjustments geometry_adjuster_->set_segment_end_point(end_point); // save the unadjusted end point it can be used to compute adjustments
geometry_adjuster->enable_adjustments(true); // enable adjustments geometry_adjuster_->enable_adjustments(true); // enable adjustments
} }
} }
void set_spiral_function(mapping* mapping_, const IfcSchema::IfcSpiral* c, double s, std::function<double(double)> fnX, std::function<double(double)> fnY) { void set_spiral_function(mapping* mapping_, double s, std::function<double(double)> fnX, std::function<double(double)> fnY) {
if (segment_type_ == ST_HORIZONTAL) { if (segment_type_ == ST_HORIZONTAL) {
auto start = start_; auto start = start_;
projected_length_ = length_; projected_length_ = length_;
auto segment_type = segment_type_; auto segment_type = segment_type_;
geometry_adjuster = std::make_shared<GEOMETRY_ADJUSTER>(mapping_, segment_type_, inst_, next_inst_); geometry_adjuster_ = std::make_shared<GEOMETRY_ADJUSTER>(mapping_, inst_, next_inst_);
auto start_x = s ? boost::math::quadrature::trapezoidal(fnX, 0.0, start / s) : 0.0; auto start_x = s ? boost::math::quadrature::trapezoidal(fnX, 0.0, start / s) : 0.0;
auto start_y = s ? boost::math::quadrature::trapezoidal(fnY, 0.0, start / s) : 0.0; auto start_y = s ? boost::math::quadrature::trapezoidal(fnY, 0.0, start / s) : 0.0;
auto start_dx = s ? fnX(start / s)/s : 0.0; auto start_dx = s ? fnX(start / s)/s : 0.0;
auto start_dy = s ? fnY(start / s)/s : 0.0; auto start_dy = s ? fnY(start / s)/s : 0.0;
eval_ = [start, s, start_x, start_y, start_dx,start_dy,fnX, fnY, segment_type, geometry_adjuster = this->geometry_adjuster](double u) { eval_ = [start, s, start_x, start_y, start_dx,start_dy,fnX, fnY, segment_type, geometry_adjuster = geometry_adjuster_](double u) {
u += start; u += start;
@@ -461,7 +440,7 @@ class curve_segment_evaluator {
eval_ = [s,fnX,fnY,fc](double u) -> Eigen::Matrix4d { eval_ = [s,fnX,fnY,fc](double u) -> Eigen::Matrix4d {
// find x when u - s = 0 // find x when u - s = 0
std::uintmax_t max_iter = 5000; std::uintmax_t max_iter = 5000;
auto max_iter_ = max_iter; //auto max_iter_ = max_iter;
auto tol = [](double a, double b) { return fabs(b - a) < 1.0E-09; }; auto tol = [](double a, double b) { return fabs(b - a) < 1.0E-09; };
auto ux = u; auto ux = u;
try { try {
@@ -488,92 +467,216 @@ class curve_segment_evaluator {
return m; return m;
}; };
} else if (segment_type_ == ST_CANT) {
Logger::Error(std::runtime_error("Unexpected segment type encountered - cant is handled in set_cant_spiral_function - should never get here"));
eval_ = [](double /*u*/) -> Eigen::Matrix4d { return Eigen::Matrix4d::Identity(); };
} }
else if (segment_type_ == ST_CANT) { else {
auto cant_adjuster_ = std::make_shared<cant_adjuster>(mapping_, segment_type_, inst_, next_inst_);
eval_ = [cant_adjuster_](double u) {
Eigen::Matrix4d result = Eigen::Matrix4d::Identity();
cant_adjuster_->transform_and_adjust(u, result);
return result;
};
}
else {
Logger::Error(std::runtime_error("Unexpected segment type encountered")); Logger::Error(std::runtime_error("Unexpected segment type encountered"));
eval_ = [](double /*u*/) -> Eigen::Matrix4d { return Eigen::Matrix4d::Identity(); };
}
} }
}
// defines the eval_ functor for cant segments.
// Cant returns D at a distance along the curve, u.
// CantSlope returns the slope of the Cant function at u. CantSlope(u) is the derivative of Cant(u)
void set_cant_spiral_function(mapping* mapping_, std::function<double(double)> Cant, std::function<double(double)> CantSlope) {
geometry_adjuster_ = std::make_shared<cant_adjuster>(mapping_, inst_, next_inst_);
eval_ = [geometry_adjuster = geometry_adjuster_, Cant, CantSlope](double u) -> Eigen::Matrix4d {
auto cant = Cant(u);
auto slope = CantSlope(u);
auto angle = atan(slope);
auto dx = cos(angle);
auto dy = sin(angle);
Eigen::Matrix4d m;
m.col(0) = Eigen::Vector4d(dx, dy, 0, 0);
m.col(1) = Eigen::Vector4d(-dy, dx, 0, 0);
m.col(2) = Eigen::Vector4d(0, 0, 1.0, 0);
m.col(3) = Eigen::Vector4d(0.0, cant, 0.0, 1.0);
return geometry_adjuster->transform_and_adjust(u, m);
};
}
// defines the eval_ functor for constant cant segments.
// the parent curve is IfcClothoid
// For all the other cant types with spiral parent curves, just applying the cant_adjuster works
// when compared to the results published at https://github.com/bSI-RailwayRoom/IFC-Rail-Unit-Test-Reference-Code/
// However, for IfcClothoid, the cant needs to be adjusted by the IfcCurveSegment.Placement.Y value to make the results
// match those from the bSI Railway Room unit tests
void set_clothoid_cant_spiral_function(mapping* mapping_, std::function<double(double)> Cant, std::function<double(double)> CantSlope) {
geometry_adjuster_ = std::make_shared<GEOMETRY_ADJUSTER>(mapping_, inst_, next_inst_);
auto cant_adjuster_ = std::make_shared<cant_adjuster>(mapping_, inst_, next_inst_);
eval_ = [geometry_adjuster = geometry_adjuster_,cant_adjuster=cant_adjuster_, Cant, CantSlope](double u) -> Eigen::Matrix4d {
auto cant = Cant(u);
auto slope = CantSlope(u);
// this is the hack that makes this function different from set_cant_spiral_function
cant += geometry_adjuster->get_placement().col(3)(1);
auto angle = atan(slope);
auto dx = cos(angle);
auto dy = sin(angle);
Eigen::Matrix4d m;
m.col(0) = Eigen::Vector4d(dx, dy, 0, 0);
m.col(1) = Eigen::Vector4d(-dy, dx, 0, 0);
m.col(2) = Eigen::Vector4d(0, 0, 1.0, 0);
m.col(3) = Eigen::Vector4d(0.0, cant, 0.0, 1.0);
return cant_adjuster->transform_and_adjust(u, m);
};
}
// Clothoid using numerical integration
#ifdef SCHEMA_HAS_IfcClothoid #ifdef SCHEMA_HAS_IfcClothoid
// Then initialize Function(double) -> Vector3, by means of IfcCurve subtypes
void operator()(const IfcSchema::IfcClothoid* c) { void operator()(const IfcSchema::IfcClothoid* c) {
// see https://standards.buildingsmart.org/IFC/RELEASE/IFC4_3/HTML/lexical/IfcClothoid.htm // see https://standards.buildingsmart.org/IFC/RELEASE/IFC4_3/HTML/lexical/IfcClothoid.htm
// also see, https://standards.buildingsmart.org/IFC/RELEASE/IFC4_3/HTML/concepts/Partial_Templates/Geometry/Curve_Segment_Geometry/Clothoid_Transition_Segment/content.html, // also see, https://standards.buildingsmart.org/IFC/RELEASE/IFC4_3/HTML/concepts/Partial_Templates/Geometry/Curve_Segment_Geometry/Clothoid_Transition_Segment/content.html,
// which defines the clothoid constant as sqrt(L*R) and L is the length measured from the inflection point and R is the radius at L
auto A = c->ClothoidConstant(); auto A = c->ClothoidConstant();
auto s = fabs(A * sqrt(PI)); // curve length when u = 1.0
auto fn_x = [A, s](double t) -> double { return A ? s * cos(PI * A * t * t / (2 * fabs(A))) : 0.0; }; if (segment_type_ == ST_CANT) {
auto fn_y = [A, s](double t) -> double { return A ? s * sin(PI * A * t * t / (2 * fabs(A))) : 0.0; }; auto Cant = [A,L=length_*length_unit_](double t) -> double
{ return A ? L*A * t / fabs(pow(A, 3)) : 0.0; };
set_spiral_function(mapping_, c, s, fn_x, fn_y); auto CantSlope = [A, L = length_ * length_unit_](double /*t*/) -> double
{ return A ? L*A / fabs(pow(A, 3)) : 0.0; };
set_clothoid_cant_spiral_function(mapping_, Cant, CantSlope);
} else {
auto s = fabs(A * sqrt(PI)); // curve length when u = 1.0
auto fn_x = [A, s](double t) -> double { return A ? s * cos(PI * A * t * t / (2 * fabs(A))) : 0.0; };
auto fn_y = [A, s](double t) -> double { return A ? s * sin(PI * A * t * t / (2 * fabs(A))) : 0.0; };
set_spiral_function(mapping_, s, fn_x, fn_y);
}
} }
#endif #endif
#if defined SCHEMA_HAS_IfcCosineSpiral #if defined SCHEMA_HAS_IfcCosineSpiral
void operator()(const IfcSchema::IfcCosineSpiral* c) { void operator()(const IfcSchema::IfcCosineSpiral* c) {
auto const_term = c->ConstantTerm(); auto constant_term = c->ConstantTerm();
auto cosine_term = c->CosineTerm(); auto cosine_term = c->CosineTerm();
auto L = length()*length_unit_; auto L = length()*length_unit_;
auto theta = [const_term, cosine_term,L,lu=length_unit_](double t) -> double { if (segment_type_ == ST_HORIZONTAL) {
auto a0 = const_term.has_value() ? t / (const_term.value()*lu) : 0.0;
auto a1 = (L/PI)*(1.0/(cosine_term*lu))*sin((PI/L)*t); auto theta = [constant_term, cosine_term, L, lu = length_unit_](double t) -> double {
return a0 + a1; auto a0 = constant_term.has_value() ? t / (constant_term.value() * lu) : 0.0;
}; auto a1 = (L / PI) * (1.0 / (cosine_term * lu)) * sin((PI / L) * t);
auto fn_x = [theta](double t) -> double { return cos(theta(t)); }; return a0 + a1;
auto fn_y = [theta](double t) -> double { return sin(theta(t)); }; };
double s = 1.0; auto fn_x = [theta](double t) -> double { return cos(theta(t)); };
set_spiral_function(mapping_, c, s, fn_x, fn_y); auto fn_y = [theta](double t) -> double { return sin(theta(t)); };
double s = 1.0;
set_spiral_function(mapping_, s, fn_x, fn_y);
} else if (segment_type_ == ST_CANT) {
auto Cant = [constant_term, cosine_term, L, lu = length_unit_](double t) -> double
{
auto a0 = constant_term.has_value() ? L / (constant_term.value() * lu) : 0.0;
auto a1 = (L / (cosine_term * lu)) * cos(PI * t*lu/L);
return a0 + a1;
};
auto CantSlope = [cosine_term, L, lu = length_unit_](double t) -> double {
auto a1 = -(PI/L)*(L / (cosine_term * lu)) * sin(PI * t * lu / L);
return a1;
};
set_cant_spiral_function(mapping_, Cant, CantSlope);
} else if (segment_type_ == ST_VERTICAL) {
Logger::Error(std::runtime_error("IfcCosineSpiral cannot be used for vertical alignment"));
eval_ = [](double /*u*/) -> Eigen::Matrix4d { return Eigen::Matrix4d::Identity(); };
} else {
Logger::Error(std::runtime_error("Unexpected segment type encountered"));
eval_ = [](double /*u*/) -> Eigen::Matrix4d { return Eigen::Matrix4d::Identity(); };
}
} }
#endif #endif
#if defined SCHEMA_HAS_IfcSineSpiral #if defined SCHEMA_HAS_IfcSineSpiral
void operator()(const IfcSchema::IfcSineSpiral* c) { void operator()(const IfcSchema::IfcSineSpiral* c) {
auto const_term = c->ConstantTerm(); auto constant_term = c->ConstantTerm();
auto linear_term = c->LinearTerm(); auto linear_term = c->LinearTerm();
auto sine_term = c->SineTerm(); auto sine_term = c->SineTerm();
auto L = length() * length_unit_; auto L = length() * length_unit_;
auto theta = [const_term, linear_term, sine_term,L,lu=length_unit_](double t) -> double { if (segment_type_ == ST_HORIZONTAL) {
auto a0 = const_term.has_value() ? t / (const_term.value() * lu) : 0.0; auto theta = [constant_term, linear_term, sine_term, L, lu = length_unit_](double t) -> double {
auto a1 = linear_term.has_value() ? sign(linear_term.value())*pow(t / (linear_term.value()*lu), 2.0) / 2.0 : 0.0; auto a0 = constant_term.has_value() ? t / (constant_term.value() * lu) : 0.0;
auto a2 = -1.0*(L / (2 * PI * sine_term * lu)) * (cos(2 * PI * t / L) - 1.0); auto a1 = linear_term.has_value() ? sign(linear_term.value()) * pow(t / (linear_term.value() * lu), 2.0) / 2.0 : 0.0;
return a0 + a1 + a2; auto a2 = -1.0 * (L / (2 * PI * sine_term * lu)) * (cos(2 * PI * t / L) - 1.0);
}; return a0 + a1 + a2;
auto fn_x = [theta](double t) -> double { return cos(theta(t)); }; };
auto fn_y = [theta](double t) -> double { return sin(theta(t)); }; auto fn_x = [theta](double t) -> double { return cos(theta(t)); };
double s = 1.0; auto fn_y = [theta](double t) -> double { return sin(theta(t)); };
set_spiral_function(mapping_, c, s, fn_x, fn_y); double s = 1.0;
set_spiral_function(mapping_, s, fn_x, fn_y);
} else if (segment_type_ == ST_CANT) {
auto Cant = [constant_term,linear_term,sine_term, L, lu = length_unit_](double t) -> double {
auto a0 = constant_term.has_value() ? L / (constant_term.value() * lu) : 0.0;
auto a1 = linear_term.has_value() ? sign(linear_term.value()) * pow(L / (linear_term.value() * lu), 2.0) * (t/L) : 0.0;
auto a2 = (L / (sine_term * lu)) * sin(2 * PI * t / L);
return a0 + a1 + a2;
};
auto CantSlope = [linear_term, sine_term, L, lu = length_unit_](double t) -> double {
auto a1 = linear_term.has_value() ? sign(linear_term.value()) * pow(L / (linear_term.value() * lu), 2.0) * (1.0 / L) : 0.0;
auto a2 = (2*PI/L)*(L / (sine_term * lu)) * cos(2 * PI * t / L);
return a1 + a2;
};
set_cant_spiral_function(mapping_, Cant, CantSlope);
} else if (segment_type_ == ST_VERTICAL) {
Logger::Error(std::runtime_error("IfcSineSpiral cannot be used for vertical alignment"));
eval_ = [](double /*u*/) -> Eigen::Matrix4d { return Eigen::Matrix4d::Identity(); };
} else {
Logger::Error(std::runtime_error("Unexpected segment type encountered"));
eval_ = [](double /*u*/) -> Eigen::Matrix4d { return Eigen::Matrix4d::Identity(); };
}
} }
#endif #endif
void polynomial_spiral(const IfcSchema::IfcSpiral* c, double lu, boost::optional<double> A0, boost::optional<double> A1, boost::optional<double> A2, boost::optional<double> A3, boost::optional<double> A4, boost::optional<double> A5, boost::optional<double> A6, boost::optional<double> A7) { void polynomial_spiral(boost::optional<double> A0, boost::optional<double> A1, boost::optional<double> A2, boost::optional<double> A3, boost::optional<double> A4, boost::optional<double> A5, boost::optional<double> A6, boost::optional<double> A7) {
auto theta = [A0, A1, A2, A3, A4, A5, A6, A7, lu](double t) { auto theta = [A0, A1, A2, A3, A4, A5, A6, A7, start=start_*length_unit_,lu=length_unit_](double t) {
auto a0 = A0.has_value() ? t / (A0.value() * lu) : 0.0; //t += start;
auto a1 = A1.has_value() ? A1.value() * lu * std::pow(t, 2) / (2 * fabs(std::pow(A1.value() * lu, 3))) : 0.0; auto a0 = A0.has_value() ? t / (A0.value() * lu) : 0.0;
auto a2 = A2.has_value() ? std::pow(t, 3) / (3 * std::pow(A2.value() * lu, 3)) : 0.0; auto a1 = A1.has_value() ? A1.value() * lu * std::pow(t, 2) / (2 * fabs(std::pow(A1.value() * lu, 3))) : 0.0;
auto a3 = A3.has_value() ? A3.value() * lu * std::pow(t, 4) / (4 * fabs(std::pow(A3.value() * lu, 5))) : 0.0; auto a2 = A2.has_value() ? std::pow(t, 3) / (3 * std::pow(A2.value() * lu, 3)) : 0.0;
auto a4 = A4.has_value() ? std::pow(t, 5) / (5 * std::pow(A4.value() * lu, 5)) : 0.0; auto a3 = A3.has_value() ? A3.value() * lu * std::pow(t, 4) / (4 * fabs(std::pow(A3.value() * lu, 5))) : 0.0;
auto a5 = A5.has_value() ? A5.value() * lu * std::pow(t, 6) / (6 * fabs(std::pow(A5.value() * lu, 7))) : 0.0; auto a4 = A4.has_value() ? std::pow(t, 5) / (5 * std::pow(A4.value() * lu, 5)) : 0.0;
auto a6 = A6.has_value() ? std::pow(t, 7) / (7 * std::pow(A6.value() * lu, 7)) : 0.0; auto a5 = A5.has_value() ? A5.value() * lu * std::pow(t, 6) / (6 * fabs(std::pow(A5.value() * lu, 7))) : 0.0;
auto a7 = A7.has_value() ? A7.value() * lu * std::pow(t, 8) / (8 * fabs(std::pow(A7.value() * lu, 9))) : 0.0; auto a6 = A6.has_value() ? std::pow(t, 7) / (7 * std::pow(A6.value() * lu, 7)) : 0.0;
return a0 + a1 + a2 + a3 + a4 + a5 + a6 + a7; auto a7 = A7.has_value() ? A7.value() * lu * std::pow(t, 8) / (8 * fabs(std::pow(A7.value() * lu, 9))) : 0.0;
}; return a0 + a1 + a2 + a3 + a4 + a5 + a6 + a7;
};
auto fn_x = [theta](double t) -> double { return cos(theta(t)); }; auto fn_x = [theta](double t) -> double { return cos(theta(t)); };
auto fn_y = [theta](double t) -> double { return sin(theta(t)); }; auto fn_y = [theta](double t) -> double { return sin(theta(t)); };
double s = 1.0; double s = 1.0;
set_spiral_function(mapping_, c, s, fn_x, fn_y); set_spiral_function(mapping_, s, fn_x, fn_y);
}
void polynomial_cant_spiral(boost::optional<double> A0, boost::optional<double> A1, boost::optional<double> A2, boost::optional<double> A3, boost::optional<double> A4, boost::optional<double> A5, boost::optional<double> A6, boost::optional<double> A7) {
auto Cant = [A0, A1, A2, A3, A4, A5, A6, A7, start=start_*length_unit_,L=length_*length_unit_, lu=length_unit_,length=length_](double t) {
t += start;
auto a0 = A0.has_value() ? 1 / (A0.value() * lu) : 0.0;
auto a1 = A1.has_value() ? A1.value() * lu * t / fabs(std::pow(A1.value() * lu, 3)) : 0.0;
auto a2 = A2.has_value() ? std::pow(t, 2) / std::pow(A2.value() * lu, 3) : 0.0;
auto a3 = A3.has_value() ? A3.value() * lu * std::pow(t, 3) / fabs(std::pow(A3.value() * lu, 5)) : 0.0;
auto a4 = A4.has_value() ? std::pow(t, 4) / std::pow(A4.value() * lu, 5) : 0.0;
auto a5 = A5.has_value() ? A5.value() * lu * std::pow(t, 5) / fabs(std::pow(A5.value() * lu, 7)) : 0.0;
auto a6 = A6.has_value() ? std::pow(t, 6) / std::pow(A6.value() * lu, 7) : 0.0;
auto a7 = A7.has_value() ? A7.value() * lu * std::pow(t, 7) / fabs(std::pow(A7.value() * lu, 9)) : 0.0;
return L*(a0 + a1 + a2 + a3 + a4 + a5 + a6 + a7);
};
auto CantSlope = [A1, A2, A3, A4, A5, A6, A7, start = start_ * length_unit_, L = length_ * length_unit_, lu = length_unit_, length = length_](double t) {
t += start;
auto a1 = A1.has_value() ? A1.value() * lu / fabs(std::pow(A1.value() * lu, 3)) : 0.0;
auto a2 = A2.has_value() ? 2 * t / std::pow(A2.value() * lu, 3) : 0.0;
auto a3 = A3.has_value() ? 3 * A3.value() * lu * std::pow(t, 2) / fabs(std::pow(A3.value() * lu, 5)) : 0.0;
auto a4 = A4.has_value() ? 4 * std::pow(t, 3) / std::pow(A4.value() * lu, 5) : 0.0;
auto a5 = A5.has_value() ? 5 * A5.value() * lu * std::pow(t, 4) / fabs(std::pow(A5.value() * lu, 7)) : 0.0;
auto a6 = A6.has_value() ? 6 * std::pow(t, 5) / std::pow(A6.value() * lu, 7) : 0.0;
auto a7 = A7.has_value() ? 7 * A7.value() * lu * std::pow(t, 6) / fabs(std::pow(A7.value() * lu, 9)) : 0.0;
return L * (a1 + a2 + a3 + a4 + a5 + a6 + a7);
};
set_cant_spiral_function(mapping_, Cant, CantSlope);
} }
#ifdef SCHEMA_HAS_IfcSecondOrderPolynomialSpiral #ifdef SCHEMA_HAS_IfcSecondOrderPolynomialSpiral
@@ -583,8 +686,13 @@ class curve_segment_evaluator {
auto A1 = c->LinearTerm(); auto A1 = c->LinearTerm();
auto A2 = c->QuadraticTerm(); auto A2 = c->QuadraticTerm();
boost::optional<double> A3, A4, A5, A6, A7; boost::optional<double> A3, A4, A5, A6, A7;
polynomial_spiral(c, length_unit_, A0, A1, A2, A3, A4, A5, A6, A7);
} if (segment_type_ == ST_CANT) {
polynomial_cant_spiral(A0, A1, A2, A3, A4, A5, A6, A7);
} else {
polynomial_spiral(A0, A1, A2, A3, A4, A5, A6, A7);
}
}
#endif #endif
#ifdef SCHEMA_HAS_IfcThirdOrderPolynomialSpiral #ifdef SCHEMA_HAS_IfcThirdOrderPolynomialSpiral
@@ -594,7 +702,13 @@ class curve_segment_evaluator {
auto A2 = c->QuadraticTerm(); auto A2 = c->QuadraticTerm();
auto A3 = c->CubicTerm(); auto A3 = c->CubicTerm();
boost::optional<double> A4, A5, A6, A7; boost::optional<double> A4, A5, A6, A7;
polynomial_spiral(c, length_unit_, A0, A1, A2, A3, A4, A5, A6, A7);
if (segment_type_ == ST_CANT) {
polynomial_cant_spiral(A0, A1, A2, A3, A4, A5, A6, A7);
} else {
polynomial_spiral(A0, A1, A2, A3, A4, A5, A6, A7);
}
} }
#endif #endif
@@ -609,7 +723,11 @@ class curve_segment_evaluator {
auto A6 = c->SexticTerm(); auto A6 = c->SexticTerm();
auto A7 = c->SepticTerm(); auto A7 = c->SepticTerm();
polynomial_spiral(c, length_unit_, A0, A1, A2, A3, A4, A5, A6, A7); if (segment_type_ == ST_CANT) {
polynomial_cant_spiral(A0, A1, A2, A3, A4, A5, A6, A7);
} else {
polynomial_spiral(A0, A1, A2, A3, A4, A5, A6, A7);
}
} }
#endif #endif
@@ -626,10 +744,10 @@ class curve_segment_evaluator {
auto segment_type = segment_type_; auto segment_type = segment_type_;
geometry_adjuster = std::make_shared<GEOMETRY_ADJUSTER>(mapping_, segment_type_, inst_, next_inst_); geometry_adjuster_ = std::make_shared<GEOMETRY_ADJUSTER>(mapping_, inst_, next_inst_);
projected_length_ = length_; projected_length_ = length_;
eval_ = [R, start_x, start_y, start_angle, sign_l, segment_type, geometry_adjuster = this->geometry_adjuster](double u) eval_ = [R, start_x, start_y, start_angle, sign_l, segment_type, geometry_adjuster = geometry_adjuster_](double u)
{ {
// u is measured along the circle // u is measured along the circle
auto angle = start_angle + sign_l * u / R; auto angle = start_angle + sign_l * u / R;
@@ -663,7 +781,6 @@ class curve_segment_evaluator {
eval_ = [ys,R,u_end,start_angle,end_angle,sign_l](double u) -> Eigen::Matrix4d { eval_ = [ys,R,u_end,start_angle,end_angle,sign_l](double u) -> Eigen::Matrix4d {
// u is measured along the x-axis, not along the circle // u is measured along the x-axis, not along the circle
auto theta = start_angle + u * (end_angle - start_angle) / u_end; auto theta = start_angle + u * (end_angle - start_angle) / u_end;
auto x = u;
//auto y = ys + R * (sin(theta) - sin(start_angle)); //auto y = ys + R * (sin(theta) - sin(start_angle));
auto y = ys - sign_l*(sqrt(R * R - pow(R * cos(start_angle) + u, 2)) - sqrt(R * R - pow(R * cos(start_angle), 2))); auto y = ys - sign_l*(sqrt(R * R - pow(R * cos(start_angle) + u, 2)) - sqrt(R * R - pow(R * cos(start_angle), 2)));
@@ -679,199 +796,200 @@ class curve_segment_evaluator {
}; };
} else if (segment_type_ == ST_CANT) { } else if (segment_type_ == ST_CANT) {
Logger::Warning(std::runtime_error("Use of IfcCircle for cant is not supported")); Logger::Warning(std::runtime_error("Use of IfcCircle for cant is not supported"));
eval_ = [](double u) -> Eigen::Matrix4d { eval_ = [](double /*u*/) -> Eigen::Matrix4d { return Eigen::Matrix4d::Identity(); };
return Eigen::Matrix4d::Identity();
};
} else { } else {
Logger::Error(std::runtime_error("Unexpected segment type encountered")); Logger::Error(std::runtime_error("Unexpected segment type encountered"));
eval_ = [](double u) -> Eigen::Matrix4d { eval_ = [](double /*u*/) -> Eigen::Matrix4d { return Eigen::Matrix4d::Identity(); };
return Eigen::Matrix4d::Identity();
};
} }
} }
void operator()(const IfcSchema::IfcPolyline* pl) void operator()(const IfcSchema::IfcPolyline* pl)
{ {
struct Range if (segment_type_ == ST_HORIZONTAL || segment_type_ == ST_VERTICAL) {
{ struct Range {
double u_start; double u_start;
double u_end; double u_end;
std::function<bool(double, double, double)> compare; std::function<bool(double, double, double)> compare;
bool operator<(const Range& r) const { return u_start < r.u_start; } bool operator<(const Range& r) const { return u_start < r.u_start; }
}; };
using Function = std::function<Eigen::Matrix4d(double u)>; using Function = std::function<Eigen::Matrix4d(double u)>;
std::map<Range, Function> fns; std::map<Range, Function> fns;
auto p = pl->Points(); auto p = pl->Points();
if (p->size() < 2) if (p->size() < 2) {
{ Logger::Error(std::runtime_error("invalid polyline - must have at least 2 points")); // this should never happen, but just in case it does
Logger::Error(std::runtime_error("invalid polyline - must have at least 2 points")); // this should never happen, but just in case it does }
}
auto std_compare = [](double u_start, double u, double u_end) {return u_start <= u && u < u_end; }; auto std_compare = [](double u_start, double u, double u_end) { return u_start <= u && u < u_end; };
auto end_compare = [](double u_start, double u, double u_end) { return u_start <= u && u <= (u_end + 0.001); }; auto end_compare = [](double u_start, double u, double u_end) { return u_start <= u && u <= (u_end + 0.001); };
auto begin = p->begin(); auto begin = p->begin();
auto iter = begin; auto iter = begin;
auto end = p->end(); auto end = p->end();
auto last = std::prev(end); auto last = std::prev(end);
auto p1 = *(iter++); auto p1 = *(iter++);
if (p1->Coordinates().size() != 2) Logger::Warning("Expected IfcPolyline.Points to be 2D",pl);
auto u = 0.0;
for (; iter != end; iter++)
{
auto p2 = *iter;
auto p1x = p1->Coordinates()[0]; if (p1->Coordinates().size() != 2) {
auto p1y = p1->Coordinates()[1]; Logger::Warning("Expected IfcPolyline.Points to be 2D", pl);
}
auto p2x = p2->Coordinates()[0]; auto u = 0.0;
auto p2y = p2->Coordinates()[1]; for (; iter != end; iter++) {
auto p2 = *iter;
auto dx = p2x - p1x; auto p1x = p1->Coordinates()[0];
auto dy = p2y - p1y; auto p1y = p1->Coordinates()[1];
auto l = sqrt(dx * dx + dy * dy);
if (l < mapping_->settings().get<ifcopenshell::geometry::settings::Precision>().get())
{
std::ostringstream os;
os << "Coincident IfcPolyline.Points are not expected. Skipping point " << std::distance(iter, begin) << std::endl;
Logger::Warning(os.str(), pl);
continue; // go to next point
}
dx /= l; auto p2x = p2->Coordinates()[0];
dy /= l; auto p2y = p2->Coordinates()[1];
auto segment_type = segment_type_; auto dx = p2x - p1x;
auto dy = p2y - p1y;
auto l = sqrt(dx * dx + dy * dy);
auto fn = [p1x, p1y, dx, dy, segment_type](double u) { if (l < mapping_->settings().get<ifcopenshell::geometry::settings::Precision>().get()) {
auto x = segment_type == ST_HORIZONTAL ? p1x + u * dx : u; std::ostringstream os;
auto y = p1y + u * dy; os << "Coincident IfcPolyline.Points are not expected. Skipping point " << std::distance(iter, begin) << std::endl;
Logger::Warning(os.str(), pl);
continue; // go to next point
}
Eigen::Matrix4d m; dx /= l;
if (segment_type == ST_HORIZONTAL) { dy /= l;
// rotate about the Z-axis
m.col(0) = Eigen::Vector4d(dx, dy, 0, 0); // vector tangent to the curve, in the direction of the curve
m.col(1) = Eigen::Vector4d(-dy, dx, 0, 0); // vector perpendicular to the curve, towards the left when looking from start to end along the curve (this is used for IfcAxis2PlacementLinear.RefDirection when it is not provided)
m.col(2) = Eigen::Vector4d(0, 0, 1.0, 0); // cross product of x and y and will always be up (this is used for IfcAxis2PlacementLinear.Axis when it is not provided)
m.col(3) = Eigen::Vector4d(x, y, 0.0, 1.0);
} else if (segment_type == ST_VERTICAL) {
// rotate about the Y-axis (slope along u is dx, slope vertically is dy, vertical position is y)
m.col(0) = Eigen::Vector4d(dx, 0, dy, 0);
m.col(1) = Eigen::Vector4d(0, 1, 0, 0);
m.col(2) = Eigen::Vector4d(-dy, 0, dx, 0);
m.col(3) = Eigen::Vector4d(0, 0, y, 1.0); // y is an elevation so store it as z
} else if (segment_type == ST_CANT) {
Logger::Warning(std::runtime_error("Use of IfcPolyline for cant is not supported"));
m = Eigen::Matrix4d::Identity();
} else {
Logger::Error(std::runtime_error("Unexpected segment type encountered"));
m = Eigen::Matrix4d::Identity();
}
return m; auto segment_type = segment_type_;
};
fns.insert(std::make_pair(Range{ u, u + l,iter == last ? end_compare : std_compare }, fn)); auto fn = [p1x, p1y, dx, dy, segment_type](double u) {
auto x = segment_type == ST_HORIZONTAL ? p1x + u * dx : u;
auto y = p1y + u * dy;
p1 = p2; Eigen::Matrix4d m;
u = u + l; if (segment_type == ST_HORIZONTAL) {
} // rotate about the Z-axis
m.col(0) = Eigen::Vector4d(dx, dy, 0, 0); // vector tangent to the curve, in the direction of the curve
geometry_adjuster = std::make_shared<GEOMETRY_ADJUSTER>(mapping_, segment_type_, inst_, next_inst_); m.col(1) = Eigen::Vector4d(-dy, dx, 0, 0); // vector perpendicular to the curve, towards the left when looking from start to end along the curve (this is used for IfcAxis2PlacementLinear.RefDirection when it is not provided)
m.col(2) = Eigen::Vector4d(0, 0, 1.0, 0); // cross product of x and y and will always be up (this is used for IfcAxis2PlacementLinear.Axis when it is not provided)
m.col(3) = Eigen::Vector4d(x, y, 0.0, 1.0);
} else if (segment_type == ST_VERTICAL) {
// rotate about the Y-axis (slope along u is dx, slope vertically is dy, vertical position is y)
m.col(0) = Eigen::Vector4d(dx, 0, dy, 0);
m.col(1) = Eigen::Vector4d(0, 1, 0, 0);
m.col(2) = Eigen::Vector4d(-dy, 0, dx, 0);
m.col(3) = Eigen::Vector4d(0, 0, y, 1.0); // y is an elevation so store it as z
} else if (segment_type == ST_CANT) {
Logger::Warning(std::runtime_error("Use of IfcPolyline for cant is not supported"));
m = Eigen::Matrix4d::Identity();
} else {
Logger::Error(std::runtime_error("Unexpected segment type encountered"));
m = Eigen::Matrix4d::Identity();
}
projected_length_ = length_; return m;
};
eval_ = [fns, geometry_adjuster = this->geometry_adjuster](double u) { fns.insert(std::make_pair(Range{u, u + l, iter == last ? end_compare : std_compare}, fn));
auto iter = std::find_if(fns.cbegin(), fns.cend(), [=](const auto& fn)
{
auto [u_start, u_end, compare] = fn.first;
return compare(u_start, u, u_end);
});
if (iter == fns.end()) throw std::runtime_error("invalid distance from start"); // this should never happen, but just in case it does, throw an exception so the problem gets automatically detected p1 = p2;
u = u + l;
}
const auto& [u_start, u_end, compare] = iter->first; geometry_adjuster_ = std::make_shared<GEOMETRY_ADJUSTER>(mapping_, inst_, next_inst_);
const auto& fn = iter->second;
Eigen::Matrix4d m = fn(u - u_start); // (u - u_start) is distance from start of this segment of the polyline projected_length_ = length_;
return geometry_adjuster->transform_and_adjust(u, m);
}; eval_ = [fns, geometry_adjuster = geometry_adjuster_](double u) {
auto iter = std::find_if(fns.cbegin(), fns.cend(), [=](const auto& fn) {
auto [u_start, u_end, compare] = fn.first;
return compare(u_start, u, u_end);
});
if (iter == fns.end()) {
throw std::runtime_error("invalid distance from start"); // this should never happen, but just in case it does, throw an exception so the problem gets automatically detected
}
const auto& [u_start, u_end, compare] = iter->first;
const auto& fn = iter->second;
Eigen::Matrix4d m = fn(u - u_start); // (u - u_start) is distance from start of this segment of the polyline
return geometry_adjuster->transform_and_adjust(u, m);
};
} else if (segment_type_ == ST_CANT) {
Logger::Warning(std::runtime_error("Use of IfcPolyline for cant is not supported"));
eval_ = [](double /*u*/) -> Eigen::Matrix4d { return Eigen::Matrix4d::Identity(); };
} else {
Logger::Warning(std::runtime_error("Unexpected segment type encountered"));
eval_ = [](double /*u*/) -> Eigen::Matrix4d { return Eigen::Matrix4d::Identity(); };
}
} }
void operator()(const IfcSchema::IfcLine* l) { void operator()(const IfcSchema::IfcLine* l) {
auto s = l->Pnt();
auto c = s->Coordinates();
auto v = l->Dir();
// 8.9.3.75 IfcVector https://standards.buildingsmart.org/IFC/RELEASE/IFC4_3/HTML/lexical/IfcVector.htm
// 8.9.3.30 IfcDirection https://standards.buildingsmart.org/IFC/RELEASE/IFC4_3/HTML/lexical/IfcDirection.htm
// "The IfcDirection does not imply a vector length, and the direction ratios does not have to be normalized."
//
// Therefore, the direction ratios need to be normalized to compute points on the line. Magnitude is not used
// because it relates to the parameterization of the line, which isn't currently done for IfcCurveSegment
auto dr = v->Orientation()->DirectionRatios();
// normalize the direction ratios
double m_squared = std::inner_product(dr.begin(), dr.end(), dr.begin(), 0.0);
double m = sqrt(m_squared);
std::for_each(dr.begin(), dr.end(), [m](auto& d) { return d / m; });
auto dx = dr[0];
auto dy = dr[1];
auto px = c[0] * length_unit_;
auto py = c[1] * length_unit_;
projected_length_ = length_; projected_length_ = length_;
geometry_adjuster = std::make_shared<GEOMETRY_ADJUSTER>(mapping_, segment_type_, inst_, next_inst_);
if (segment_type_ == ST_HORIZONTAL || segment_type_ == ST_VERTICAL) { if (segment_type_ == ST_HORIZONTAL || segment_type_ == ST_VERTICAL) {
geometry_adjuster_ = std::make_shared<GEOMETRY_ADJUSTER>(mapping_, inst_, next_inst_);
eval_ = [px, py, dx, dy, geometry_adjuster=this->geometry_adjuster](double u) { auto s = l->Pnt();
auto c = s->Coordinates();
auto v = l->Dir();
// 8.9.3.75 IfcVector https://standards.buildingsmart.org/IFC/RELEASE/IFC4_3/HTML/lexical/IfcVector.htm
// 8.9.3.30 IfcDirection https://standards.buildingsmart.org/IFC/RELEASE/IFC4_3/HTML/lexical/IfcDirection.htm
// "The IfcDirection does not imply a vector length, and the direction ratios does not have to be normalized."
//
// Therefore, the direction ratios need to be normalized to compute points on the line. Magnitude is not used
// because it relates to the parameterization of the line, which isn't currently done for IfcCurveSegment
auto dr = v->Orientation()->DirectionRatios();
// normalize the direction ratios
double m_squared = std::inner_product(dr.begin(), dr.end(), dr.begin(), 0.0);
double m = sqrt(m_squared);
std::for_each(dr.begin(), dr.end(), [m](auto& d) { return d / m; });
auto dx = dr[0];
auto dy = dr[1];
auto px = c[0] * length_unit_;
auto py = c[1] * length_unit_;
eval_ = [px, py, dx, dy, geometry_adjuster=geometry_adjuster_](double u) {
auto x = px + u/dx; auto x = px + u/dx;
auto y = py;// + u * dy/dx; auto y = py;
Eigen::Matrix4d m = Eigen::Matrix4d::Identity();; Eigen::Matrix4d m = Eigen::Matrix4d::Identity();
//m.col(0) = Eigen::Vector4d(dx, dy, 0, 0); // vector tangent to the curve, in the direction of the curve
//m.col(1) = Eigen::Vector4d(-dy, dx, 0, 0); // vector perpendicular to the curve, towards the left when looking from start to end along the curve (this is used for IfcAxis2PlacementLinear.RefDirection when it is not provided)
//m.col(2) = Eigen::Vector4d(0, 0, 1.0, 0); // cross product of x and y and will always be up (this is used for IfcAxis2PlacementLinear.Axis when it is not provided)
m.col(3) = Eigen::Vector4d(x, y, 0.0, 1.0); m.col(3) = Eigen::Vector4d(x, y, 0.0, 1.0);
return geometry_adjuster->transform_and_adjust(u, m); return geometry_adjuster->transform_and_adjust(u, m);
}; };
} }
else if (segment_type_ == ST_CANT) { else if (segment_type_ == ST_CANT) {
auto cant_adjuster_ = std::make_shared<cant_adjuster>(mapping_, segment_type_, inst_, next_inst_); geometry_adjuster_ = std::make_shared<GEOMETRY_ADJUSTER>(mapping_, inst_, next_inst_);
eval_ = [cant_adjuster_](double u) { auto cant_adjuster_ = std::make_shared<cant_adjuster>(mapping_, inst_, next_inst_);
Eigen::Matrix4d result = Eigen::Matrix4d::Identity(); eval_ = [geometry_adjuster = geometry_adjuster_,cant_adjuster=cant_adjuster_](double u) {
cant_adjuster_->transform_and_adjust(u, result); Eigen::Matrix4d m = Eigen::Matrix4d::Identity();
return result; return geometry_adjuster->transform_and_adjust(u, cant_adjuster->transform_and_adjust(u,m));
}; };
} }
else { else {
Logger::Error(std::runtime_error("Unexpected segment type encountered"), l); Logger::Warning(std::runtime_error("Unexpected segment type encountered"));
eval_ = [](double /*u*/) -> Eigen::Matrix4d { return Eigen::Matrix4d::Identity(); };
} }
} }
void operator()(const IfcSchema::IfcPolynomialCurve* p) { void operator()(const IfcSchema::IfcPolynomialCurve* pc) {
// see https://forums.buildingsmart.org/t/ifcpolynomialcurve-clarification/4716 for discussion on IfcPolynomialCurve // see https://forums.buildingsmart.org/t/ifcpolynomialcurve-clarification/4716 for discussion on IfcPolynomialCurve
auto coeffX = p->CoefficientsX().get_value_or(std::vector<double>()); auto coeffX = pc->CoefficientsX().get_value_or(std::vector<double>());
auto coeffY = p->CoefficientsY().get_value_or(std::vector<double>()); auto coeffY = pc->CoefficientsY().get_value_or(std::vector<double>());
auto coeffZ = p->CoefficientsZ().get_value_or(std::vector<double>()); auto coeffZ = pc->CoefficientsZ().get_value_or(std::vector<double>());
if (!coeffZ.empty()) if (!coeffZ.empty())
Logger::Warning("Expected IfcPolynomialCurve.CoefficientsZ to be undefined for alignment geometry. Coefficients ignored.", p); Logger::Warning("Expected IfcPolynomialCurve.CoefficientsZ to be undefined for alignment geometry. Coefficients ignored.", pc);
auto length_unit = length_unit_; auto length_unit = length_unit_;
geometry_adjuster = std::make_shared<GEOMETRY_ADJUSTER>(mapping_, segment_type_, inst_, next_inst_); geometry_adjuster_ = std::make_shared<GEOMETRY_ADJUSTER>(mapping_, inst_, next_inst_);
if (segment_type_ == ST_HORIZONTAL) { if (segment_type_ == ST_HORIZONTAL) {
// @rb need to work on this - u is distance along curve, this differs from vertical where u = x // @rb need to work on this - u is distance along curve, this differs from vertical where u = x
projected_length_ = length_; projected_length_ = length_;
// This functor evalutes the derivative of the Y polynomial // This functor evaluates the derivative of the Y polynomial
auto df = [coeffY, length_unit](double x) -> double { auto df = [coeffY, length_unit](double x) -> double {
auto begin = std::next(coeffY.begin()); auto begin = std::next(coeffY.begin());
auto iter = begin; auto iter = begin;
@@ -897,10 +1015,10 @@ class curve_segment_evaluator {
return s; return s;
}; };
eval_ = [start=start_,coeffX,coeffY,length_unit,geometry_adjuster = this->geometry_adjuster, fc](double u) -> Eigen::Matrix4d { eval_ = [start=start_,coeffX,coeffY,length_unit,geometry_adjuster = geometry_adjuster_, fc](double u) -> Eigen::Matrix4d {
// find x when u - s = 0 // find x when u - s = 0
std::uintmax_t max_iter = 5000; std::uintmax_t max_iter = 5000;
auto max_iter_ = max_iter; //auto max_iter_ = max_iter;
auto tol = [](double a, double b) { return fabs(b - a) < 1.0E-09; }; auto tol = [](double a, double b) { return fabs(b - a) < 1.0E-09; };
auto ux = u; auto ux = u;
try { try {
@@ -985,12 +1103,12 @@ class curve_segment_evaluator {
}; };
} else if (segment_type_ == ST_CANT) { } else if (segment_type_ == ST_CANT) {
Logger::Warning(std::runtime_error("Use of IfcPolynomialCurve for cant is not supported")); Logger::Warning(std::runtime_error("Use of IfcPolynomialCurve for cant is not supported"));
eval_ = [](double u) -> Eigen::Matrix4d { eval_ = [](double /*u*/) -> Eigen::Matrix4d {
return Eigen::Matrix4d::Identity(); return Eigen::Matrix4d::Identity();
}; };
} else { } else {
Logger::Error(std::runtime_error("Unexpected segment type encountered")); Logger::Error(std::runtime_error("Unexpected segment type encountered"));
eval_ = [](double u) -> Eigen::Matrix4d { eval_ = [](double /*u*/) -> Eigen::Matrix4d {
return Eigen::Matrix4d::Identity(); return Eigen::Matrix4d::Identity();
}; };
} }
@@ -999,13 +1117,13 @@ class curve_segment_evaluator {
// Take the boost::type value from mpl::for_each and test it against our curve instance // Take the boost::type value from mpl::for_each and test it against our curve instance
template <typename T> template <typename T>
void operator()(boost::type<T>) { void operator()(boost::type<T>) {
if (curve_->as<T>()) { if (parent_curve_->as<T>()) {
(*this)(curve_->as<T>()); (*this)(parent_curve_->as<T>());
} }
} }
double length() const { double length() const {
return segment_type_ == ST_HORIZONTAL ? length_ : projected_length_; return (segment_type_ == ST_HORIZONTAL || segment_type_ == ST_CANT) ? length_ : projected_length_;
} }
const std::optional<std::function<Eigen::Matrix4d(double)>>& evaluation_function() const { const std::optional<std::function<Eigen::Matrix4d(double)>>& evaluation_function() const {
src/ifcgeom/mapping/IfcSegmentedReferenceCurve.cpp
+3 -1
View File
@@ -53,7 +53,9 @@ taxonomy::ptr mapping::map_impl(const IfcSchema::IfcSegmentedReferenceCurve* ins
auto g = gradient->evaluate(u); auto g = gradient->evaluate(u);
auto c = cant->evaluate(u); auto c = cant->evaluate(u);
std::swap(c.col(3)(1), c.col(3)(2)); c.col(3)(0) = 0.0; // x is distance along. zero it out so it doesn't add to the x from gradient curve
c.col(1).swap(c.col(2)); // c is 2D in distance along - y plane, swap y and z so elevations become z
c.row(1).swap(c.row(2));
Eigen::Matrix4d m; Eigen::Matrix4d m;
m = g * c; m = g * c;