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IfcOpenShell/src/ifcgeom_schema_agnostic/IfcGeomRepresentation.cpp
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Thomas Krijnen b611151039 #3536 fix edge segments in world coords
2023-08-09 14:55:23 +08:00

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/********************************************************************************
* *
* This file is part of IfcOpenShell. *
* *
* IfcOpenShell is free software: you can redistribute it and/or modify *
* it under the terms of the Lesser GNU General Public License as published by *
* the Free Software Foundation, either version 3.0 of the License, or *
* (at your option) any later version. *
* *
* IfcOpenShell is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* Lesser GNU General Public License for more details. *
* *
* You should have received a copy of the Lesser GNU General Public License *
* along with this program. If not, see <http://www.gnu.org/licenses/>. *
* *
********************************************************************************/
#include "IfcGeomRepresentation.h"
#include <BRep_Tool.hxx>
#include <BRepTools.hxx>
#include <BRep_Builder.hxx>
#include <Geom_Plane.hxx>
#include <TopoDS_Compound.hxx>
#include <BRepGProp.hxx>
#include <GProp_GProps.hxx>
#include "../ifcparse/IfcLogger.h"
#include "../ifcgeom_schema_agnostic/Kernel.h"
#include "../ifcgeom_schema_agnostic/base_utils.h"
IfcGeom::Representation::Serialization::Serialization(const BRep& brep)
: Representation(brep.settings())
, id_(brep.id())
{
TopoDS_Compound compound = brep.as_compound();
for (IfcGeom::IfcRepresentationShapeItems::const_iterator it = brep.begin(); it != brep.end(); ++ it) {
int sid = -1;
if (it->hasStyle() && it->Style().Diffuse()) {
const IfcGeom::SurfaceStyle::ColorComponent& clr = *it->Style().Diffuse();
surface_styles_.push_back(clr.R());
surface_styles_.push_back(clr.G());
surface_styles_.push_back(clr.B());
sid = it->Style().Id().get_value_or(-1);
} else {
surface_styles_.push_back(-1.);
surface_styles_.push_back(-1.);
surface_styles_.push_back(-1.);
}
if (it->hasStyle() && it->Style().Transparency()) {
surface_styles_.push_back(1. - *it->Style().Transparency());
} else {
surface_styles_.push_back(1.);
}
surface_style_ids_.push_back(sid);
}
std::stringstream sstream;
BRepTools::Write(compound,sstream);
brep_data_ = sstream.str();
}
// todo copied from kernel
#include <BRepBuilderAPI_Transform.hxx>
#include <BRepBuilderAPI_GTransform.hxx>
TopoDS_Shape apply_transformation(const TopoDS_Shape& s, const gp_Trsf& t) {
if (t.Form() == gp_Identity) {
return s;
} else {
/// @todo set to 1. and exactly 1. or use epsilon?
if (t.ScaleFactor() != 1.) {
return BRepBuilderAPI_Transform(s, t, true);
} else {
return s.Moved(t);
}
}
}
TopoDS_Shape apply_transformation(const TopoDS_Shape& s, const gp_GTrsf& t) {
if (t.Form() == gp_Other) {
return BRepBuilderAPI_GTransform(s, t, true);
} else {
return apply_transformation(s, t.Trsf());
}
}
TopoDS_Compound IfcGeom::Representation::BRep::as_compound(bool force_meters) const {
TopoDS_Compound compound;
BRep_Builder builder;
builder.MakeCompound(compound);
for (IfcGeom::IfcRepresentationShapeItems::const_iterator it = begin(); it != end(); ++it) {
const TopoDS_Shape& s = it->Shape();
gp_GTrsf trsf = it->Placement();
if (!force_meters && settings().get(IteratorSettings::CONVERT_BACK_UNITS)) {
gp_Trsf scale;
scale.SetScaleFactor(1.0 / settings().unit_magnitude());
trsf.PreMultiply(scale);
}
const TopoDS_Shape moved_shape = apply_transformation(s, trsf);
builder.Add(compound, moved_shape);
}
return compound;
}
namespace {
void accumulate(const gp_Ax3& ax, const gp_Dir& normal, double area, double& along_x, double& along_y, double& along_z) {
along_x += area * fabs(ax.XDirection().Dot(normal));
along_y += area * fabs(ax.YDirection().Dot(normal));
along_z += area * fabs(ax.Direction().Dot(normal));
}
void surface_area_along_direction(double tol, const TopoDS_Shape& s, const gp_Ax3& ax, double& along_x, double& along_y, double& along_z) {
along_x = along_y = along_z = 0.;
bool meshed = false;
TopExp_Explorer exp(s, TopAbs_FACE);
for (; exp.More(); exp.Next()) {
const TopoDS_Face& face = TopoDS::Face(exp.Current());
Handle(Geom_Surface) surf = BRep_Tool::Surface(face);
Handle(Geom_Plane) plane = Handle(Geom_Plane)::DownCast(surf);
if (surf->DynamicType() == STANDARD_TYPE(Geom_Plane)) {
GProp_GProps prop_area;
BRepGProp::SurfaceProperties(face, prop_area);
const double area = prop_area.Mass();
accumulate(ax, plane->Position().Direction(), area, along_x, along_y, along_z);
} else {
if (!meshed) {
try {
BRepMesh_IncrementalMesh(s, tol);
} catch (...) {
Logger::Message(Logger::LOG_ERROR, "Failed to triangulate shape");
return;
}
meshed = true;
}
TopLoc_Location loc;
Handle(Poly_Triangulation) tri = BRep_Tool::Triangulation(face, loc);
if (!tri.IsNull()) {
std::vector<gp_XYZ> coords;
coords.reserve(tri->NbNodes());
for (int i = 1; i <= tri->NbNodes(); ++i) {
coords.push_back(tri->Node(i).Transformed(loc).XYZ());
}
const Poly_Array1OfTriangle& triangles = tri->Triangles();
for (int i = 1; i <= triangles.Length(); ++i) {
int n1, n2, n3;
if (face.Orientation() == TopAbs_REVERSED) {
triangles(i).Get(n3, n2, n1);
} else {
triangles(i).Get(n1, n2, n3);
}
const gp_XYZ& pt1 = coords[n1 - 1];
const gp_XYZ& pt2 = coords[n2 - 1];
const gp_XYZ& pt3 = coords[n3 - 1];
const gp_Vec v1 = pt2 - pt1;
const gp_Vec v2 = pt3 - pt2;
const gp_Vec v3 = pt1 - pt3;
const gp_Vec normal_vector = v1 ^ v2;
if (normal_vector.Magnitude() > ALMOST_ZERO) {
gp_Dir normal = gp_Dir();
double edge_lengths[3] = { v1.Magnitude(), v2.Magnitude(), v3.Magnitude() };
std::sort(&edge_lengths[0], &edge_lengths[2]);
const double& a = edge_lengths[0];
const double& b = edge_lengths[1];
const double& c = edge_lengths[2];
const double area = 0.25 * sqrt((a + (b + c))*(c - (a - b))*(c + (a - b))*(a + (b - c)));
accumulate(ax, normal, area, along_x, along_y, along_z);
}
}
}
}
}
}
}
bool IfcGeom::Representation::BRep::calculate_surface_area(double& area) const {
try {
area = 0.;
for (IfcGeom::IfcRepresentationShapeItems::const_iterator it = begin(); it != end(); ++it) {
GProp_GProps prop;
BRepGProp::SurfaceProperties(it->Shape(), prop);
area += prop.Mass();
}
return true;
} catch (...) {
Logger::Error("Error during calculation of surface area");
return false;
}
}
bool IfcGeom::Representation::BRep::calculate_volume(double& volume) const {
try {
volume = 0.;
for (IfcGeom::IfcRepresentationShapeItems::const_iterator it = begin(); it != end(); ++it) {
if (util::is_manifold(it->Shape())) {
GProp_GProps prop;
BRepGProp::VolumeProperties(it->Shape(), prop);
volume += prop.Mass();
} else {
return false;
}
}
return true;
} catch (...) {
Logger::Error("Error during calculation of volume");
return false;
}
}
bool IfcGeom::Representation::BRep::calculate_projected_surface_area(const gp_Ax3 & ax, double & along_x, double & along_y, double & along_z) const {
try {
along_x = along_y = along_z = 0.;
for (IfcGeom::IfcRepresentationShapeItems::const_iterator it = begin(); it != end(); ++it) {
double x, y, z;
surface_area_along_direction(settings().deflection_tolerance(), it->Shape(), ax, x, y, z);
if (util::is_manifold(it->Shape())) {
x /= 2.;
y /= 2.;
z /= 2.;
}
along_x += x;
along_y += y;
along_z += z;
}
return true;
} catch (...) {
Logger::Error("Error during calculation of projected surface area");
return false;
}
}
IfcGeom::Representation::Triangulation::Triangulation(const BRep& shape_model)
: Representation(shape_model.settings())
, id_(shape_model.id())
, weld_offset_(0)
{
for (IfcGeom::IfcRepresentationShapeItems::const_iterator iit = shape_model.begin(); iit != shape_model.end(); ++iit) {
// Don't weld vertices that belong to different items to prevent non-manifold situations.
weld_offset_ += welds.size();
welds.clear();
// When welding vertices, vertex coords will be shared among faces so we need to per-shape set
// to keep track of which edges were already emitted.
std::set<std::pair<int, int>> emitted_edges;
int surface_style_id = -1;
if (iit->hasStyle()) {
Material adapter(iit->StylePtr());
std::vector<Material>::const_iterator jt = std::find(_materials.begin(), _materials.end(), adapter);
if (jt == _materials.end()) {
surface_style_id = (int)_materials.size();
_materials.push_back(adapter);
} else {
surface_style_id = (int)(jt - _materials.begin());
}
}
if (settings().get(IteratorSettings::APPLY_DEFAULT_MATERIALS) && surface_style_id == -1) {
Material material(IfcGeom::get_default_style(settings().element_type()));
std::vector<Material>::const_iterator mit = std::find(_materials.begin(), _materials.end(), material);
if (mit == _materials.end()) {
surface_style_id = (int)_materials.size();
_materials.push_back(material);
} else {
surface_style_id = (int)(mit - _materials.begin());
}
}
const TopoDS_Shape& s = iit->Shape();
const gp_GTrsf& trsf = iit->Placement();
// Triangulate the shape
try {
BRepMesh_IncrementalMesh(s, settings().deflection_tolerance(), false, settings().angular_tolerance());
} catch (...) {
Logger::Message(Logger::LOG_ERROR, "Failed to triangulate shape");
continue;
}
// Iterates over the faces of the shape
int num_faces = 0;
TopExp_Explorer exp;
for (exp.Init(s, TopAbs_FACE); exp.More(); exp.Next(), ++num_faces) {
TopoDS_Face face = TopoDS::Face(exp.Current());
TopLoc_Location loc;
Handle_Poly_Triangulation tri = BRep_Tool::Triangulation(face, loc);
if (tri.IsNull()) {
Logger::Message(Logger::LOG_ERROR, "Triangulation missing for face");
} else {
// A 3x3 matrix to rotate the vertex normals
const gp_Mat rotation_matrix = trsf.VectorialPart();
// Keep track of the number of times an edge is used
// Manifold edges (i.e. edges used twice) are deemed invisible
std::map<std::pair<int, int>, int> edgecount;
std::vector<gp_XYZ> coords;
BRepGProp_Face prop(face);
std::map<int, int> dict;
// Vertex normals are only calculated if vertices are not welded and calculation is not disable explicitly.
const bool calculate_normals = !settings().get(IteratorSettings::WELD_VERTICES) &&
!settings().get(IteratorSettings::NO_NORMALS);
for (int i = 1; i <= tri->NbNodes(); ++i) {
coords.push_back(tri->Node(i).Transformed(loc).XYZ());
trsf.Transforms(*coords.rbegin());
dict[i] = addVertex(iit->ItemId(), surface_style_id, *coords.rbegin());
if (calculate_normals) {
const gp_Pnt2d& uv = tri->UVNode(i);
gp_Pnt p;
gp_Vec normal_direction;
prop.Normal(uv.X(), uv.Y(), p, normal_direction);
gp_Vec normal(0., 0., 0.);
if (normal_direction.Magnitude() > 1.e-9) {
normal = gp_Dir(normal_direction.XYZ() * rotation_matrix);
} else {
Handle_Geom_Surface surf = BRep_Tool::Surface(face);
// Special case the normal at the poles of a spherical surface
if (surf->DynamicType() == STANDARD_TYPE(Geom_SphericalSurface)) {
if (fabs(fabs(uv.Y()) - M_PI / 2.) < 1.e-9) {
const bool is_top = uv.Y() > 0;
const bool is_forward = face.Orientation() == TopAbs_FORWARD;
const double z = (is_top == is_forward) ? 1. : -1.;
normal = gp_Dir(gp_XYZ(0, 0, z) * rotation_matrix);
}
}
// TODO: Do the same for conical surfaces, but they are rare in IFC.
}
_normals.push_back(normal.X());
_normals.push_back(normal.Y());
_normals.push_back(normal.Z());
}
}
const Poly_Array1OfTriangle& triangles = tri->Triangles();
for (int i = 1; i <= triangles.Length(); ++i) {
int n1, n2, n3;
if (face.Orientation() == TopAbs_REVERSED)
triangles(i).Get(n3, n2, n1);
else triangles(i).Get(n1, n2, n3);
/* An alternative would be to calculate normals based
* on the coordinates of the mesh vertices */
/*
const gp_XYZ pt1 = coords[n1-1];
const gp_XYZ pt2 = coords[n2-1];
const gp_XYZ pt3 = coords[n3-1];
const gp_XYZ v1 = pt2-pt1;
const gp_XYZ v2 = pt3-pt2;
gp_Dir normal = gp_Dir(v1^v2);
_normals.push_back((float)normal.X());
_normals.push_back((float)normal.Y());
_normals.push_back((float)normal.Z());
*/
_faces.push_back(dict[n1]);
_faces.push_back(dict[n2]);
_faces.push_back(dict[n3]);
_material_ids.push_back(surface_style_id);
_item_ids.push_back(iit->ItemId());
addEdge(dict[n1], dict[n2], edgecount);
addEdge(dict[n2], dict[n3], edgecount);
addEdge(dict[n3], dict[n1], edgecount);
}
for (auto& p : edgecount) {
// @todo should be != 2?
if (p.second == 1 && emitted_edges.find(p.first) == emitted_edges.end()) {
// non manifold edge, face boundary
_edges.push_back(p.first.first);
_edges.push_back(p.first.second);
if (settings().get(IteratorSettings::WELD_VERTICES)) {
// only relevant while welding, because otherwise vertices are not shared among distinct faces
emitted_edges.insert(p.first);
}
}
}
}
}
if (!_normals.empty() && settings().get(IfcGeom::IteratorSettings::GENERATE_UVS)) {
uvs_ = box_project_uvs(_verts, _normals);
}
if (num_faces == 0) {
// Edges are only emitted if there are no faces. A mixed representation of faces
// and loose edges is discouraged by the standard. An alternative would be to use
// TopExp_Explorer texp(s, TopAbs_EDGE, TopAbs_FACE) to find edges that do not
// belong to any face.
for (TopExp_Explorer texp(s, TopAbs_EDGE); texp.More(); texp.Next()) {
BRepAdaptor_Curve crv(TopoDS::Edge(texp.Current()));
GCPnts_QuasiUniformDeflection tessellater(crv, settings().deflection_tolerance());
int n = tessellater.NbPoints();
int previous = -1;
for (int i = 1; i <= n; ++i) {
gp_XYZ p = tessellater.Value(i).XYZ();
auto p_local = p;
trsf.Transforms(p);
int current = addVertex(iit->ItemId(), surface_style_id, p);
std::vector<std::pair<int, int>> segments;
if (i > 1) {
segments.push_back(std::make_pair(previous, current));
}
if (settings().get(IfcGeom::IteratorSettings::EDGE_ARROWS)) {
// In case you want direction arrows on your edges
double u = tessellater.Parameter(i);
gp_XYZ p2, p3;
gp_Pnt tmp;
gp_Vec tmp2;
crv.D1(u, tmp, tmp2);
gp_Dir d1, d2, d3, d4;
d1 = tmp2;
if (texp.Current().Orientation() == TopAbs_REVERSED) {
d1 = -d1;
}
if (fabs(d1.Z()) < 0.5) {
d2 = d1.Crossed(gp::DZ());
} else {
d2 = d1.Crossed(gp::DY());
}
d3 = d1.XYZ() + d2.XYZ();
d4 = d1.XYZ() - d2.XYZ();
p2 = p_local - d3.XYZ() / 10.;
p3 = p_local - d4.XYZ() / 10.;
trsf.Transforms(p2);
trsf.Transforms(p3);
int left = addVertex(iit->ItemId(), surface_style_id, p2);
int right = addVertex(iit->ItemId(), surface_style_id, p3);
segments.push_back(std::make_pair(left, current));
segments.push_back(std::make_pair(right, current));
}
for (auto& sgmt : segments) {
_edges.push_back(sgmt.first);
_edges.push_back(sgmt.second);
_material_ids.push_back(surface_style_id);
_item_ids.push_back(iit->ItemId());
}
previous = current;
}
}
}
BRepTools::Clean(s);
}
}
/// Generates UVs for a single mesh using box projection.
/// @todo Very simple impl. Assumes that input vertices and normals match 1:1.
std::vector<double> IfcGeom::Representation::Triangulation::box_project_uvs(const std::vector<double>& vertices, const std::vector<double>& normals)
{
std::vector<double> uvs;
uvs.resize(vertices.size() / 3 * 2);
for (size_t uv_idx = 0, v_idx = 0;
uv_idx < uvs.size() && v_idx < vertices.size() && v_idx < normals.size();
uv_idx += 2, v_idx += 3) {
double n_x = normals[v_idx], n_y = normals[v_idx + 1], n_z = normals[v_idx + 2];
double v_x = vertices[v_idx], v_y = vertices[v_idx + 1], v_z = vertices[v_idx + 2];
if (std::abs(n_x) > std::abs(n_y) && std::abs(n_x) > std::abs(n_z)) {
uvs[uv_idx] = v_z;
uvs[uv_idx + 1] = v_y;
}
if (std::abs(n_y) > std::abs(n_x) && std::abs(n_y) > std::abs(n_z)) {
uvs[uv_idx] = v_x;
uvs[uv_idx + 1] = v_z;
}
if (std::abs(n_z) > std::abs(n_x) && std::abs(n_z) > std::abs(n_y)) {
uvs[uv_idx] = v_x;
uvs[uv_idx + 1] = v_y;
}
}
return uvs;
}
int IfcGeom::Representation::Triangulation::addVertex(int item_index, int material_index, const gp_XYZ & p) {
const bool convert = settings().get(IteratorSettings::CONVERT_BACK_UNITS);
const double X = convert ? (p.X() / settings().unit_magnitude()) : p.X();
const double Y = convert ? (p.Y() / settings().unit_magnitude()) : p.Y();
const double Z = convert ? (p.Z() / settings().unit_magnitude()) : p.Z();
int i = (int)_verts.size() / 3;
if (settings().get(IteratorSettings::WELD_VERTICES)) {
const VertexKey key = std::make_tuple(item_index, material_index, X, Y, Z);
typename VertexKeyMap::const_iterator it = welds.find(key);
if (it != welds.end()) return it->second;
i = (int)(welds.size() + weld_offset_);
welds[key] = i;
}
_verts.push_back(X);
_verts.push_back(Y);
_verts.push_back(Z);
return i;
}
void IfcGeom::Representation::Triangulation::addEdge(int n1, int n2, std::map<std::pair<int, int>, int>& edgecount) {
const Edge e = Edge((std::min)(n1, n2), (std::max)(n1, n2));
edgecount[e] ++;
}
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