assimp/code/Importer/IFC/IFCGeometry.cpp

889 lines
32 KiB
C++

/*
Open Asset Import Library (assimp)
----------------------------------------------------------------------
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All rights reserved.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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*/
/** @file IFCGeometry.cpp
* @brief Geometry conversion and synthesis for IFC
*/
#ifndef ASSIMP_BUILD_NO_IFC_IMPORTER
#include "IFCUtil.h"
#include "Common/PolyTools.h"
#include "PostProcessing/ProcessHelper.h"
#ifdef ASSIMP_USE_HUNTER
# include <poly2tri/poly2tri.h>
# include <polyclipping/clipper.hpp>
#else
# include "../contrib/poly2tri/poly2tri/poly2tri.h"
# include "../contrib/clipper/clipper.hpp"
#endif
#include <memory>
#include <iterator>
namespace Assimp {
namespace IFC {
// ------------------------------------------------------------------------------------------------
bool ProcessPolyloop(const Schema_2x3::IfcPolyLoop& loop, TempMesh& meshout, ConversionData& /*conv*/)
{
size_t cnt = 0;
for(const Schema_2x3::IfcCartesianPoint& c : loop.Polygon) {
IfcVector3 tmp;
ConvertCartesianPoint(tmp,c);
meshout.mVerts.push_back(tmp);
++cnt;
}
meshout.mVertcnt.push_back(static_cast<unsigned int>(cnt));
// zero- or one- vertex polyloops simply ignored
if (meshout.mVertcnt.back() > 1) {
return true;
}
if (meshout.mVertcnt.back()==1) {
meshout.mVertcnt.pop_back();
meshout.mVerts.pop_back();
}
return false;
}
// ------------------------------------------------------------------------------------------------
void ProcessPolygonBoundaries(TempMesh& result, const TempMesh& inmesh, size_t master_bounds = (size_t)-1)
{
// handle all trivial cases
if(inmesh.mVertcnt.empty()) {
return;
}
if(inmesh.mVertcnt.size() == 1) {
result.Append(inmesh);
return;
}
ai_assert(std::count(inmesh.mVertcnt.begin(), inmesh.mVertcnt.end(), 0) == 0);
typedef std::vector<unsigned int>::const_iterator face_iter;
face_iter begin = inmesh.mVertcnt.begin(), end = inmesh.mVertcnt.end(), iit;
std::vector<unsigned int>::const_iterator outer_polygon_it = end;
// major task here: given a list of nested polygon boundaries (one of which
// is the outer contour), reduce the triangulation task arising here to
// one that can be solved using the "quadrulation" algorithm which we use
// for pouring windows out of walls. The algorithm does not handle all
// cases but at least it is numerically stable and gives "nice" triangles.
// first compute normals for all polygons using Newell's algorithm
// do not normalize 'normals', we need the original length for computing the polygon area
std::vector<IfcVector3> normals;
inmesh.ComputePolygonNormals(normals,false);
// One of the polygons might be a IfcFaceOuterBound (in which case `master_bounds`
// is its index). Sadly we can't rely on it, the docs say 'At most one of the bounds
// shall be of the type IfcFaceOuterBound'
IfcFloat area_outer_polygon = 1e-10f;
if (master_bounds != (size_t)-1) {
ai_assert(master_bounds < inmesh.mVertcnt.size());
outer_polygon_it = begin + master_bounds;
}
else {
for(iit = begin; iit != end; ++iit) {
// find the polygon with the largest area and take it as the outer bound.
IfcVector3& n = normals[std::distance(begin,iit)];
const IfcFloat area = n.SquareLength();
if (area > area_outer_polygon) {
area_outer_polygon = area;
outer_polygon_it = iit;
}
}
}
ai_assert(outer_polygon_it != end);
const size_t outer_polygon_size = *outer_polygon_it;
const IfcVector3& master_normal = normals[std::distance(begin, outer_polygon_it)];
// Generate fake openings to meet the interface for the quadrulate
// algorithm. It boils down to generating small boxes given the
// inner polygon and the surface normal of the outer contour.
// It is important that we use the outer contour's normal because
// this is the plane onto which the quadrulate algorithm will
// project the entire mesh.
std::vector<TempOpening> fake_openings;
fake_openings.reserve(inmesh.mVertcnt.size()-1);
std::vector<IfcVector3>::const_iterator vit = inmesh.mVerts.begin(), outer_vit;
for(iit = begin; iit != end; vit += *iit++) {
if (iit == outer_polygon_it) {
outer_vit = vit;
continue;
}
// Filter degenerate polygons to keep them from causing trouble later on
IfcVector3& n = normals[std::distance(begin,iit)];
const IfcFloat area = n.SquareLength();
if (area < 1e-5f) {
IFCImporter::LogWarn("skipping degenerate polygon (ProcessPolygonBoundaries)");
continue;
}
fake_openings.push_back(TempOpening());
TempOpening& opening = fake_openings.back();
opening.extrusionDir = master_normal;
opening.solid = NULL;
opening.profileMesh = std::make_shared<TempMesh>();
opening.profileMesh->mVerts.reserve(*iit);
opening.profileMesh->mVertcnt.push_back(*iit);
std::copy(vit, vit + *iit, std::back_inserter(opening.profileMesh->mVerts));
}
// fill a mesh with ONLY the main polygon
TempMesh temp;
temp.mVerts.reserve(outer_polygon_size);
temp.mVertcnt.push_back(static_cast<unsigned int>(outer_polygon_size));
std::copy(outer_vit, outer_vit+outer_polygon_size,
std::back_inserter(temp.mVerts));
GenerateOpenings(fake_openings, normals, temp, false, false);
result.Append(temp);
}
// ------------------------------------------------------------------------------------------------
void ProcessConnectedFaceSet(const Schema_2x3::IfcConnectedFaceSet& fset, TempMesh& result, ConversionData& conv)
{
for(const Schema_2x3::IfcFace& face : fset.CfsFaces) {
// size_t ob = -1, cnt = 0;
TempMesh meshout;
for(const Schema_2x3::IfcFaceBound& bound : face.Bounds) {
if(const Schema_2x3::IfcPolyLoop* const polyloop = bound.Bound->ToPtr<Schema_2x3::IfcPolyLoop>()) {
if(ProcessPolyloop(*polyloop, meshout,conv)) {
// The outer boundary is better determined by checking which
// polygon covers the largest area.
//if(bound.ToPtr<IfcFaceOuterBound>()) {
// ob = cnt;
//}
//++cnt;
}
}
else {
IFCImporter::LogWarn("skipping unknown IfcFaceBound entity, type is " + bound.Bound->GetClassName());
continue;
}
// And this, even though it is sometimes TRUE and sometimes FALSE,
// does not really improve results.
/*if(!IsTrue(bound.Orientation)) {
size_t c = 0;
for(unsigned int& c : meshout.vertcnt) {
std::reverse(result.verts.begin() + cnt,result.verts.begin() + cnt + c);
cnt += c;
}
}*/
}
ProcessPolygonBoundaries(result, meshout);
}
}
// ------------------------------------------------------------------------------------------------
void ProcessRevolvedAreaSolid(const Schema_2x3::IfcRevolvedAreaSolid& solid, TempMesh& result, ConversionData& conv)
{
TempMesh meshout;
// first read the profile description
if(!ProcessProfile(*solid.SweptArea,meshout,conv) || meshout.mVerts.size()<=1) {
return;
}
IfcVector3 axis, pos;
ConvertAxisPlacement(axis,pos,solid.Axis);
IfcMatrix4 tb0,tb1;
IfcMatrix4::Translation(pos,tb0);
IfcMatrix4::Translation(-pos,tb1);
const std::vector<IfcVector3>& in = meshout.mVerts;
const size_t size=in.size();
bool has_area = solid.SweptArea->ProfileType == "AREA" && size>2;
const IfcFloat max_angle = solid.Angle*conv.angle_scale;
if(std::fabs(max_angle) < 1e-3) {
if(has_area) {
result = meshout;
}
return;
}
const unsigned int cnt_segments = std::max(2u,static_cast<unsigned int>(conv.settings.cylindricalTessellation * std::fabs(max_angle)/AI_MATH_HALF_PI_F));
const IfcFloat delta = max_angle/cnt_segments;
has_area = has_area && std::fabs(max_angle) < AI_MATH_TWO_PI_F*0.99;
result.mVerts.reserve(size*((cnt_segments+1)*4+(has_area?2:0)));
result.mVertcnt.reserve(size*cnt_segments+2);
IfcMatrix4 rot;
rot = tb0 * IfcMatrix4::Rotation(delta,axis,rot) * tb1;
size_t base = 0;
std::vector<IfcVector3>& out = result.mVerts;
// dummy data to simplify later processing
for(size_t i = 0; i < size; ++i) {
out.insert(out.end(),4,in[i]);
}
for(unsigned int seg = 0; seg < cnt_segments; ++seg) {
for(size_t i = 0; i < size; ++i) {
const size_t next = (i+1)%size;
result.mVertcnt.push_back(4);
const IfcVector3 base_0 = out[base+i*4+3],base_1 = out[base+next*4+3];
out.push_back(base_0);
out.push_back(base_1);
out.push_back(rot*base_1);
out.push_back(rot*base_0);
}
base += size*4;
}
out.erase(out.begin(),out.begin()+size*4);
if(has_area) {
// leave the triangulation of the profile area to the ear cutting
// implementation in aiProcess_Triangulate - for now we just
// feed in two huge polygons.
base -= size*8;
for(size_t i = size; i--; ) {
out.push_back(out[base+i*4+3]);
}
for(size_t i = 0; i < size; ++i ) {
out.push_back(out[i*4]);
}
result.mVertcnt.push_back(static_cast<unsigned int>(size));
result.mVertcnt.push_back(static_cast<unsigned int>(size));
}
IfcMatrix4 trafo;
ConvertAxisPlacement(trafo, solid.Position);
result.Transform(trafo);
IFCImporter::LogDebug("generate mesh procedurally by radial extrusion (IfcRevolvedAreaSolid)");
}
// ------------------------------------------------------------------------------------------------
void ProcessSweptDiskSolid(const Schema_2x3::IfcSweptDiskSolid &solid, TempMesh& result, ConversionData& conv)
{
const Curve* const curve = Curve::Convert(*solid.Directrix, conv);
if(!curve) {
IFCImporter::LogError("failed to convert Directrix curve (IfcSweptDiskSolid)");
return;
}
const unsigned int cnt_segments = conv.settings.cylindricalTessellation;
const IfcFloat deltaAngle = AI_MATH_TWO_PI/cnt_segments;
TempMesh temp;
curve->SampleDiscrete(temp, solid.StartParam, solid.EndParam);
const std::vector<IfcVector3>& curve_points = temp.mVerts;
const size_t samples = curve_points.size();
result.mVerts.reserve(cnt_segments * samples * 4);
result.mVertcnt.reserve((cnt_segments - 1) * samples);
std::vector<IfcVector3> points;
points.reserve(cnt_segments * samples);
if(curve_points.empty()) {
IFCImporter::LogWarn("curve evaluation yielded no points (IfcSweptDiskSolid)");
return;
}
IfcVector3 current = curve_points[0];
IfcVector3 previous = current;
IfcVector3 next;
IfcVector3 startvec;
startvec.x = 1.0f;
startvec.y = 1.0f;
startvec.z = 1.0f;
unsigned int last_dir = 0;
// generate circles at the sweep positions
for(size_t i = 0; i < samples; ++i) {
if(i != samples - 1) {
next = curve_points[i + 1];
}
// get a direction vector reflecting the approximate curvature (i.e. tangent)
IfcVector3 d = (current-previous) + (next-previous);
d.Normalize();
// figure out an arbitrary point q so that (p-q) * d = 0,
// try to maximize ||(p-q)|| * ||(p_last-q_last)||
IfcVector3 q;
bool take_any = false;
for (unsigned int i = 0; i < 2; ++i, take_any = true) {
if ((last_dir == 0 || take_any) && std::abs(d.x) > 1e-6) {
q.y = startvec.y;
q.z = startvec.z;
q.x = -(d.y * q.y + d.z * q.z) / d.x;
last_dir = 0;
break;
}
else if ((last_dir == 1 || take_any) && std::abs(d.y) > 1e-6) {
q.x = startvec.x;
q.z = startvec.z;
q.y = -(d.x * q.x + d.z * q.z) / d.y;
last_dir = 1;
break;
}
else if ((last_dir == 2 && std::abs(d.z) > 1e-6) || take_any) {
q.y = startvec.y;
q.x = startvec.x;
q.z = -(d.y * q.y + d.x * q.x) / d.z;
last_dir = 2;
break;
}
}
q *= solid.Radius / q.Length();
startvec = q;
// generate a rotation matrix to rotate q around d
IfcMatrix4 rot;
IfcMatrix4::Rotation(deltaAngle,d,rot);
for (unsigned int seg = 0; seg < cnt_segments; ++seg, q *= rot ) {
points.push_back(q + current);
}
previous = current;
current = next;
}
// make quads
for(size_t i = 0; i < samples - 1; ++i) {
const aiVector3D& this_start = points[ i * cnt_segments ];
// locate corresponding point on next sample ring
unsigned int best_pair_offset = 0;
float best_distance_squared = 1e10f;
for (unsigned int seg = 0; seg < cnt_segments; ++seg) {
const aiVector3D& p = points[ (i+1) * cnt_segments + seg];
const float l = (p-this_start).SquareLength();
if(l < best_distance_squared) {
best_pair_offset = seg;
best_distance_squared = l;
}
}
for (unsigned int seg = 0; seg < cnt_segments; ++seg) {
result.mVerts.push_back(points[ i * cnt_segments + (seg % cnt_segments)]);
result.mVerts.push_back(points[ i * cnt_segments + (seg + 1) % cnt_segments]);
result.mVerts.push_back(points[ (i+1) * cnt_segments + ((seg + 1 + best_pair_offset) % cnt_segments)]);
result.mVerts.push_back(points[ (i+1) * cnt_segments + ((seg + best_pair_offset) % cnt_segments)]);
IfcVector3& v1 = *(result.mVerts.end()-1);
IfcVector3& v2 = *(result.mVerts.end()-2);
IfcVector3& v3 = *(result.mVerts.end()-3);
IfcVector3& v4 = *(result.mVerts.end()-4);
if (((v4-v3) ^ (v4-v1)) * (v4 - curve_points[i]) < 0.0f) {
std::swap(v4, v1);
std::swap(v3, v2);
}
result.mVertcnt.push_back(4);
}
}
IFCImporter::LogDebug("generate mesh procedurally by sweeping a disk along a curve (IfcSweptDiskSolid)");
}
// ------------------------------------------------------------------------------------------------
IfcMatrix3 DerivePlaneCoordinateSpace(const TempMesh& curmesh, bool& ok, IfcVector3& norOut)
{
const std::vector<IfcVector3>& out = curmesh.mVerts;
IfcMatrix3 m;
ok = true;
// The input "mesh" must be a single polygon
const size_t s = out.size();
ai_assert( curmesh.mVertcnt.size() == 1 );
ai_assert( curmesh.mVertcnt.back() == s);
const IfcVector3 any_point = out[s-1];
IfcVector3 nor;
// The input polygon is arbitrarily shaped, therefore we might need some tries
// until we find a suitable normal. Note that Newell's algorithm would give
// a more robust result, but this variant also gives us a suitable first
// axis for the 2D coordinate space on the polygon plane, exploiting the
// fact that the input polygon is nearly always a quad.
bool done = false;
size_t idx( 0 );
for (size_t i = 0; !done && i < s-2; done || ++i) {
idx = i;
for (size_t j = i+1; j < s-1; ++j) {
nor = -((out[i]-any_point)^(out[j]-any_point));
if(std::fabs(nor.Length()) > 1e-8f) {
done = true;
break;
}
}
}
if(!done) {
ok = false;
return m;
}
nor.Normalize();
norOut = nor;
IfcVector3 r = (out[idx]-any_point);
r.Normalize();
//if(d) {
// *d = -any_point * nor;
//}
// Reconstruct orthonormal basis
// XXX use Gram Schmidt for increased robustness
IfcVector3 u = r ^ nor;
u.Normalize();
m.a1 = r.x;
m.a2 = r.y;
m.a3 = r.z;
m.b1 = u.x;
m.b2 = u.y;
m.b3 = u.z;
m.c1 = -nor.x;
m.c2 = -nor.y;
m.c3 = -nor.z;
return m;
}
// Extrudes the given polygon along the direction, converts it into an opening or applies all openings as necessary.
void ProcessExtrudedArea(const Schema_2x3::IfcExtrudedAreaSolid& solid, const TempMesh& curve,
const IfcVector3& extrusionDir, TempMesh& result, ConversionData &conv, bool collect_openings)
{
// Outline: 'curve' is now a list of vertex points forming the underlying profile, extrude along the given axis,
// forming new triangles.
const bool has_area = solid.SweptArea->ProfileType == "AREA" && curve.mVerts.size() > 2;
if( solid.Depth < 1e-6 ) {
if( has_area ) {
result.Append(curve);
}
return;
}
result.mVerts.reserve(curve.mVerts.size()*(has_area ? 4 : 2));
result.mVertcnt.reserve(curve.mVerts.size() + 2);
std::vector<IfcVector3> in = curve.mVerts;
// First step: transform all vertices into the target coordinate space
IfcMatrix4 trafo;
ConvertAxisPlacement(trafo, solid.Position);
IfcVector3 vmin, vmax;
MinMaxChooser<IfcVector3>()(vmin, vmax);
for(IfcVector3& v : in) {
v *= trafo;
vmin = std::min(vmin, v);
vmax = std::max(vmax, v);
}
vmax -= vmin;
const IfcFloat diag = vmax.Length();
IfcVector3 dir = IfcMatrix3(trafo) * extrusionDir;
// reverse profile polygon if it's winded in the wrong direction in relation to the extrusion direction
IfcVector3 profileNormal = TempMesh::ComputePolygonNormal(in.data(), in.size());
if( profileNormal * dir < 0.0 )
std::reverse(in.begin(), in.end());
std::vector<IfcVector3> nors;
const bool openings = !!conv.apply_openings && conv.apply_openings->size();
// Compute the normal vectors for all opening polygons as a prerequisite
// to TryAddOpenings_Poly2Tri()
// XXX this belongs into the aforementioned function
if( openings ) {
if( !conv.settings.useCustomTriangulation ) {
// it is essential to apply the openings in the correct spatial order. The direction
// doesn't matter, but we would screw up if we started with e.g. a door in between
// two windows.
std::sort(conv.apply_openings->begin(), conv.apply_openings->end(), TempOpening::DistanceSorter(in[0]));
}
nors.reserve(conv.apply_openings->size());
for(TempOpening& t : *conv.apply_openings) {
TempMesh& bounds = *t.profileMesh.get();
if( bounds.mVerts.size() <= 2 ) {
nors.push_back(IfcVector3());
continue;
}
nors.push_back(((bounds.mVerts[2] - bounds.mVerts[0]) ^ (bounds.mVerts[1] - bounds.mVerts[0])).Normalize());
}
}
TempMesh temp;
TempMesh& curmesh = openings ? temp : result;
std::vector<IfcVector3>& out = curmesh.mVerts;
size_t sides_with_openings = 0;
for( size_t i = 0; i < in.size(); ++i ) {
const size_t next = (i + 1) % in.size();
curmesh.mVertcnt.push_back(4);
out.push_back(in[i]);
out.push_back(in[next]);
out.push_back(in[next] + dir);
out.push_back(in[i] + dir);
if( openings ) {
if( (in[i] - in[next]).Length() > diag * 0.1 && GenerateOpenings(*conv.apply_openings, nors, temp, true, true, dir) ) {
++sides_with_openings;
}
result.Append(temp);
temp.Clear();
}
}
if( openings ) {
for(TempOpening& opening : *conv.apply_openings) {
if( !opening.wallPoints.empty() ) {
IFCImporter::LogError("failed to generate all window caps");
}
opening.wallPoints.clear();
}
}
size_t sides_with_v_openings = 0;
if( has_area ) {
for( size_t n = 0; n < 2; ++n ) {
if( n > 0 ) {
for( size_t i = 0; i < in.size(); ++i )
out.push_back(in[i] + dir);
}
else {
for( size_t i = in.size(); i--; )
out.push_back(in[i]);
}
curmesh.mVertcnt.push_back(static_cast<unsigned int>(in.size()));
if( openings && in.size() > 2 ) {
if( GenerateOpenings(*conv.apply_openings, nors, temp, true, true, dir) ) {
++sides_with_v_openings;
}
result.Append(temp);
temp.Clear();
}
}
}
if( openings && ((sides_with_openings == 1 && sides_with_openings) || (sides_with_v_openings == 2 && sides_with_v_openings)) ) {
IFCImporter::LogWarn("failed to resolve all openings, presumably their topology is not supported by Assimp");
}
IFCImporter::LogDebug("generate mesh procedurally by extrusion (IfcExtrudedAreaSolid)");
// If this is an opening element, store both the extruded mesh and the 2D profile mesh
// it was created from. Return an empty mesh to the caller.
if( collect_openings && !result.IsEmpty() ) {
ai_assert(conv.collect_openings);
std::shared_ptr<TempMesh> profile = std::shared_ptr<TempMesh>(new TempMesh());
profile->Swap(result);
std::shared_ptr<TempMesh> profile2D = std::shared_ptr<TempMesh>(new TempMesh());
profile2D->mVerts.insert(profile2D->mVerts.end(), in.begin(), in.end());
profile2D->mVertcnt.push_back(static_cast<unsigned int>(in.size()));
conv.collect_openings->push_back(TempOpening(&solid, dir, profile, profile2D));
ai_assert(result.IsEmpty());
}
}
// ------------------------------------------------------------------------------------------------
void ProcessExtrudedAreaSolid(const Schema_2x3::IfcExtrudedAreaSolid& solid, TempMesh& result,
ConversionData& conv, bool collect_openings)
{
TempMesh meshout;
// First read the profile description.
if(!ProcessProfile(*solid.SweptArea,meshout,conv) || meshout.mVerts.size()<=1) {
return;
}
IfcVector3 dir;
ConvertDirection(dir,solid.ExtrudedDirection);
dir *= solid.Depth;
// Some profiles bring their own holes, for which we need to provide a container. This all is somewhat backwards,
// and there's still so many corner cases uncovered - we really need a generic solution to all of this hole carving.
std::vector<TempOpening> fisherPriceMyFirstOpenings;
std::vector<TempOpening>* oldApplyOpenings = conv.apply_openings;
if( const Schema_2x3::IfcArbitraryProfileDefWithVoids* const cprofile = solid.SweptArea->ToPtr<Schema_2x3::IfcArbitraryProfileDefWithVoids>() ) {
if( !cprofile->InnerCurves.empty() ) {
// read all inner curves and extrude them to form proper openings.
std::vector<TempOpening>* oldCollectOpenings = conv.collect_openings;
conv.collect_openings = &fisherPriceMyFirstOpenings;
for (const Schema_2x3::IfcCurve* curve : cprofile->InnerCurves) {
TempMesh curveMesh, tempMesh;
ProcessCurve(*curve, curveMesh, conv);
ProcessExtrudedArea(solid, curveMesh, dir, tempMesh, conv, true);
}
// and then apply those to the geometry we're about to generate
conv.apply_openings = conv.collect_openings;
conv.collect_openings = oldCollectOpenings;
}
}
ProcessExtrudedArea(solid, meshout, dir, result, conv, collect_openings);
conv.apply_openings = oldApplyOpenings;
}
// ------------------------------------------------------------------------------------------------
void ProcessSweptAreaSolid(const Schema_2x3::IfcSweptAreaSolid& swept, TempMesh& meshout,
ConversionData& conv)
{
if(const Schema_2x3::IfcExtrudedAreaSolid* const solid = swept.ToPtr<Schema_2x3::IfcExtrudedAreaSolid>()) {
ProcessExtrudedAreaSolid(*solid,meshout,conv, !!conv.collect_openings);
}
else if(const Schema_2x3::IfcRevolvedAreaSolid* const rev = swept.ToPtr<Schema_2x3::IfcRevolvedAreaSolid>()) {
ProcessRevolvedAreaSolid(*rev,meshout,conv);
}
else {
IFCImporter::LogWarn("skipping unknown IfcSweptAreaSolid entity, type is " + swept.GetClassName());
}
}
// ------------------------------------------------------------------------------------------------
bool ProcessGeometricItem(const Schema_2x3::IfcRepresentationItem& geo, unsigned int matid, std::set<unsigned int>& mesh_indices,
ConversionData& conv)
{
bool fix_orientation = false;
std::shared_ptr< TempMesh > meshtmp = std::make_shared<TempMesh>();
if(const Schema_2x3::IfcShellBasedSurfaceModel* shellmod = geo.ToPtr<Schema_2x3::IfcShellBasedSurfaceModel>()) {
for(std::shared_ptr<const Schema_2x3::IfcShell> shell :shellmod->SbsmBoundary) {
try {
const ::Assimp::STEP::EXPRESS::ENTITY& e = shell->To<::Assimp::STEP::EXPRESS::ENTITY>();
const Schema_2x3::IfcConnectedFaceSet& fs = conv.db.MustGetObject(e).To<Schema_2x3::IfcConnectedFaceSet>();
ProcessConnectedFaceSet(fs,*meshtmp.get(),conv);
}
catch(std::bad_cast&) {
IFCImporter::LogWarn("unexpected type error, IfcShell ought to inherit from IfcConnectedFaceSet");
}
}
fix_orientation = true;
}
else if(const Schema_2x3::IfcConnectedFaceSet* fset = geo.ToPtr<Schema_2x3::IfcConnectedFaceSet>()) {
ProcessConnectedFaceSet(*fset,*meshtmp.get(),conv);
fix_orientation = true;
}
else if(const Schema_2x3::IfcSweptAreaSolid* swept = geo.ToPtr<Schema_2x3::IfcSweptAreaSolid>()) {
ProcessSweptAreaSolid(*swept,*meshtmp.get(),conv);
}
else if(const Schema_2x3::IfcSweptDiskSolid* disk = geo.ToPtr<Schema_2x3::IfcSweptDiskSolid>()) {
ProcessSweptDiskSolid(*disk,*meshtmp.get(),conv);
}
else if(const Schema_2x3::IfcManifoldSolidBrep* brep = geo.ToPtr<Schema_2x3::IfcManifoldSolidBrep>()) {
ProcessConnectedFaceSet(brep->Outer,*meshtmp.get(),conv);
fix_orientation = true;
}
else if(const Schema_2x3::IfcFaceBasedSurfaceModel* surf = geo.ToPtr<Schema_2x3::IfcFaceBasedSurfaceModel>()) {
for(const Schema_2x3::IfcConnectedFaceSet& fc : surf->FbsmFaces) {
ProcessConnectedFaceSet(fc,*meshtmp.get(),conv);
}
fix_orientation = true;
}
else if(const Schema_2x3::IfcBooleanResult* boolean = geo.ToPtr<Schema_2x3::IfcBooleanResult>()) {
ProcessBoolean(*boolean,*meshtmp.get(),conv);
}
else if(geo.ToPtr<Schema_2x3::IfcBoundingBox>()) {
// silently skip over bounding boxes
return false;
}
else {
IFCImporter::LogWarn("skipping unknown IfcGeometricRepresentationItem entity, type is " + geo.GetClassName());
return false;
}
// Do we just collect openings for a parent element (i.e. a wall)?
// In such a case, we generate the polygonal mesh as usual,
// but attach it to a TempOpening instance which will later be applied
// to the wall it pertains to.
// Note: swep area solids are added in ProcessExtrudedAreaSolid(),
// which returns an empty mesh.
if(conv.collect_openings) {
if (!meshtmp->IsEmpty()) {
conv.collect_openings->push_back(TempOpening(geo.ToPtr<Schema_2x3::IfcSolidModel>(),
IfcVector3(0,0,0),
meshtmp,
std::shared_ptr<TempMesh>()));
}
return true;
}
if (meshtmp->IsEmpty()) {
return false;
}
meshtmp->RemoveAdjacentDuplicates();
meshtmp->RemoveDegenerates();
if(fix_orientation) {
// meshtmp->FixupFaceOrientation();
}
aiMesh* const mesh = meshtmp->ToMesh();
if(mesh) {
mesh->mMaterialIndex = matid;
mesh_indices.insert(static_cast<unsigned int>(conv.meshes.size()));
conv.meshes.push_back(mesh);
return true;
}
return false;
}
// ------------------------------------------------------------------------------------------------
void AssignAddedMeshes(std::set<unsigned int>& mesh_indices,aiNode* nd,
ConversionData& /*conv*/)
{
if (!mesh_indices.empty()) {
std::set<unsigned int>::const_iterator it = mesh_indices.cbegin();
std::set<unsigned int>::const_iterator end = mesh_indices.cend();
nd->mNumMeshes = static_cast<unsigned int>(mesh_indices.size());
nd->mMeshes = new unsigned int[nd->mNumMeshes];
for(unsigned int i = 0; it != end && i < nd->mNumMeshes; ++i, ++it) {
nd->mMeshes[i] = *it;
}
}
}
// ------------------------------------------------------------------------------------------------
bool TryQueryMeshCache(const Schema_2x3::IfcRepresentationItem& item,
std::set<unsigned int>& mesh_indices, unsigned int mat_index,
ConversionData& conv)
{
ConversionData::MeshCacheIndex idx(&item, mat_index);
ConversionData::MeshCache::const_iterator it = conv.cached_meshes.find(idx);
if (it != conv.cached_meshes.end()) {
std::copy((*it).second.begin(),(*it).second.end(),std::inserter(mesh_indices, mesh_indices.end()));
return true;
}
return false;
}
// ------------------------------------------------------------------------------------------------
void PopulateMeshCache(const Schema_2x3::IfcRepresentationItem& item,
const std::set<unsigned int>& mesh_indices, unsigned int mat_index,
ConversionData& conv)
{
ConversionData::MeshCacheIndex idx(&item, mat_index);
conv.cached_meshes[idx] = mesh_indices;
}
// ------------------------------------------------------------------------------------------------
bool ProcessRepresentationItem(const Schema_2x3::IfcRepresentationItem& item, unsigned int matid,
std::set<unsigned int>& mesh_indices,
ConversionData& conv)
{
// determine material
unsigned int localmatid = ProcessMaterials(item.GetID(), matid, conv, true);
if (!TryQueryMeshCache(item,mesh_indices,localmatid,conv)) {
if(ProcessGeometricItem(item,localmatid,mesh_indices,conv)) {
if(mesh_indices.size()) {
PopulateMeshCache(item,mesh_indices,localmatid,conv);
}
}
else return false;
}
return true;
}
} // ! IFC
} // ! Assimp
#endif