assimp/code/AssetLib/IFC/IFCOpenings.cpp

1957 lines
70 KiB
C++

/*
Open Asset Import Library (assimp)
----------------------------------------------------------------------
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All rights reserved.
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* Redistributions in binary form must reproduce the above
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contributors may be used to endorse or promote products
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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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 IFCOpenings.cpp
* @brief Implements a subset of Ifc CSG operations for pouring
* holes for windows and doors into walls.
*/
#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 <deque>
#include <forward_list>
#include <iterator>
#include <utility>
namespace Assimp {
namespace IFC {
using ClipperLib::ulong64;
// XXX use full -+ range ...
const ClipperLib::long64 max_ulong64 = 1518500249; // clipper.cpp / hiRange var
//#define to_int64(p) (static_cast<ulong64>( std::max( 0., std::min( static_cast<IfcFloat>((p)), 1.) ) * max_ulong64 ))
#define to_int64(p) (static_cast<ulong64>(static_cast<IfcFloat>((p) ) * max_ulong64 ))
#define from_int64(p) (static_cast<IfcFloat>((p)) / max_ulong64)
#define one_vec (IfcVector2(static_cast<IfcFloat>(1.0),static_cast<IfcFloat>(1.0)))
// fallback method to generate wall openings
bool TryAddOpenings_Poly2Tri(const std::vector<TempOpening>& openings,
TempMesh& curmesh);
typedef std::pair< IfcVector2, IfcVector2 > BoundingBox;
typedef std::map<IfcVector2,size_t,XYSorter> XYSortedField;
// ------------------------------------------------------------------------------------------------
void QuadrifyPart(const IfcVector2& pmin, const IfcVector2& pmax, XYSortedField& field,
const std::vector< BoundingBox >& bbs,
std::vector<IfcVector2>& out)
{
if (!(pmin.x-pmax.x) || !(pmin.y-pmax.y)) {
return;
}
IfcFloat xs = 1e10, xe = 1e10;
bool found = false;
// Search along the x-axis until we find an opening
XYSortedField::iterator start = field.begin();
for(; start != field.end(); ++start) {
const BoundingBox& bb = bbs[(*start).second];
if(bb.first.x >= pmax.x) {
break;
}
if (bb.second.x > pmin.x && bb.second.y > pmin.y && bb.first.y < pmax.y) {
xs = bb.first.x;
xe = bb.second.x;
found = true;
break;
}
}
if (!found) {
// the rectangle [pmin,pend] is opaque, fill it
out.push_back(pmin);
out.emplace_back(pmin.x,pmax.y);
out.push_back(pmax);
out.emplace_back(pmax.x,pmin.y);
return;
}
xs = std::max(pmin.x,xs);
xe = std::min(pmax.x,xe);
// see if there's an offset to fill at the top of our quad
if (xs - pmin.x) {
out.push_back(pmin);
out.emplace_back(pmin.x,pmax.y);
out.emplace_back(xs,pmax.y);
out.emplace_back(xs,pmin.y);
}
// search along the y-axis for all openings that overlap xs and our quad
IfcFloat ylast = pmin.y;
found = false;
for(; start != field.end(); ++start) {
const BoundingBox& bb = bbs[(*start).second];
if (bb.first.x > xs || bb.first.y >= pmax.y) {
break;
}
if (bb.second.y > ylast) {
found = true;
const IfcFloat ys = std::max(bb.first.y,pmin.y), ye = std::min(bb.second.y,pmax.y);
if (ys - ylast > 0.0f) {
QuadrifyPart( IfcVector2(xs,ylast), IfcVector2(xe,ys) ,field,bbs,out);
}
// the following are the window vertices
/*wnd.push_back(IfcVector2(xs,ys));
wnd.push_back(IfcVector2(xs,ye));
wnd.push_back(IfcVector2(xe,ye));
wnd.push_back(IfcVector2(xe,ys));*/
ylast = ye;
}
}
if (!found) {
// the rectangle [pmin,pend] is opaque, fill it
out.emplace_back(xs,pmin.y);
out.emplace_back(xs,pmax.y);
out.emplace_back(xe,pmax.y);
out.emplace_back(xe,pmin.y);
return;
}
if (ylast < pmax.y) {
QuadrifyPart( IfcVector2(xs,ylast), IfcVector2(xe,pmax.y) ,field,bbs,out);
}
// now for the whole rest
if (pmax.x-xe) {
QuadrifyPart(IfcVector2(xe,pmin.y), pmax ,field,bbs,out);
}
}
typedef std::vector<IfcVector2> Contour;
typedef std::vector<bool> SkipList; // should probably use int for performance reasons
struct ProjectedWindowContour
{
Contour contour;
BoundingBox bb;
SkipList skiplist;
bool is_rectangular;
ProjectedWindowContour(const Contour& contour, const BoundingBox& bb, bool is_rectangular)
: contour(contour)
, bb(bb)
, is_rectangular(is_rectangular)
{}
bool IsInvalid() const {
return contour.empty();
}
void FlagInvalid() {
contour.clear();
}
void PrepareSkiplist() {
skiplist.resize(contour.size(),false);
}
};
typedef std::vector< ProjectedWindowContour > ContourVector;
// ------------------------------------------------------------------------------------------------
bool BoundingBoxesOverlapping( const BoundingBox &ibb, const BoundingBox &bb )
{
// count the '=' case as non-overlapping but as adjacent to each other
return ibb.first.x < bb.second.x && ibb.second.x > bb.first.x &&
ibb.first.y < bb.second.y && ibb.second.y > bb.first.y;
}
// ------------------------------------------------------------------------------------------------
bool IsDuplicateVertex(const IfcVector2& vv, const std::vector<IfcVector2>& temp_contour)
{
// sanity check for duplicate vertices
for(const IfcVector2& cp : temp_contour) {
if ((cp-vv).SquareLength() < 1e-5f) {
return true;
}
}
return false;
}
// ------------------------------------------------------------------------------------------------
void ExtractVerticesFromClipper(const ClipperLib::Polygon& poly, std::vector<IfcVector2>& temp_contour,
bool filter_duplicates = false)
{
temp_contour.clear();
for(const ClipperLib::IntPoint& point : poly) {
IfcVector2 vv = IfcVector2( from_int64(point.X), from_int64(point.Y));
vv = std::max(vv,IfcVector2());
vv = std::min(vv,one_vec);
if (!filter_duplicates || !IsDuplicateVertex(vv, temp_contour)) {
temp_contour.push_back(vv);
}
}
}
// ------------------------------------------------------------------------------------------------
BoundingBox GetBoundingBox(const ClipperLib::Polygon& poly)
{
IfcVector2 newbb_min, newbb_max;
MinMaxChooser<IfcVector2>()(newbb_min, newbb_max);
for(const ClipperLib::IntPoint& point : poly) {
IfcVector2 vv = IfcVector2( from_int64(point.X), from_int64(point.Y));
// sanity rounding
vv = std::max(vv,IfcVector2());
vv = std::min(vv,one_vec);
newbb_min = std::min(newbb_min,vv);
newbb_max = std::max(newbb_max,vv);
}
return BoundingBox(newbb_min, newbb_max);
}
// ------------------------------------------------------------------------------------------------
void InsertWindowContours(const ContourVector& contours,
const std::vector<TempOpening>& /*openings*/,
TempMesh& curmesh)
{
// fix windows - we need to insert the real, polygonal shapes into the quadratic holes that we have now
for(size_t i = 0; i < contours.size();++i) {
const BoundingBox& bb = contours[i].bb;
const std::vector<IfcVector2>& contour = contours[i].contour;
if(contour.empty()) {
continue;
}
// check if we need to do it at all - many windows just fit perfectly into their quadratic holes,
// i.e. their contours *are* already their bounding boxes.
if (contour.size() == 4) {
std::set<IfcVector2,XYSorter> verts;
for(size_t n = 0; n < 4; ++n) {
verts.insert(contour[n]);
}
const std::set<IfcVector2,XYSorter>::const_iterator end = verts.end();
if (verts.find(bb.first)!=end && verts.find(bb.second)!=end
&& verts.find(IfcVector2(bb.first.x,bb.second.y))!=end
&& verts.find(IfcVector2(bb.second.x,bb.first.y))!=end
) {
continue;
}
}
const IfcFloat diag = (bb.first-bb.second).Length();
const IfcFloat epsilon = diag/1000.f;
// walk through all contour points and find those that lie on the BB corner
size_t last_hit = (size_t)-1, very_first_hit = (size_t)-1;
IfcVector2 edge;
for(size_t n = 0, e=0, size = contour.size();; n=(n+1)%size, ++e) {
// sanity checking
if (e == size*2) {
IFCImporter::LogError("encountered unexpected topology while generating window contour");
break;
}
const IfcVector2& v = contour[n];
bool hit = false;
if (std::fabs(v.x-bb.first.x)<epsilon) {
edge.x = bb.first.x;
hit = true;
}
else if (std::fabs(v.x-bb.second.x)<epsilon) {
edge.x = bb.second.x;
hit = true;
}
if (std::fabs(v.y-bb.first.y)<epsilon) {
edge.y = bb.first.y;
hit = true;
}
else if (std::fabs(v.y-bb.second.y)<epsilon) {
edge.y = bb.second.y;
hit = true;
}
if (hit) {
if (last_hit != (size_t)-1) {
const size_t old = curmesh.mVerts.size();
size_t cnt = last_hit > n ? size-(last_hit-n) : n-last_hit;
for(size_t a = last_hit, ee = 0; ee <= cnt; a=(a+1)%size, ++ee) {
// hack: this is to fix cases where opening contours are self-intersecting.
// Clipper doesn't produce such polygons, but as soon as we're back in
// our brave new floating-point world, very small distances are consumed
// by the maximum available precision, leading to self-intersecting
// polygons. This fix makes concave windows fail even worse, but
// anyway, fail is fail.
if ((contour[a] - edge).SquareLength() > diag*diag*0.7) {
continue;
}
curmesh.mVerts.emplace_back(contour[a].x, contour[a].y, 0.0f);
}
if (edge != contour[last_hit]) {
IfcVector2 corner = edge;
if (std::fabs(contour[last_hit].x-bb.first.x)<epsilon) {
corner.x = bb.first.x;
}
else if (std::fabs(contour[last_hit].x-bb.second.x)<epsilon) {
corner.x = bb.second.x;
}
if (std::fabs(contour[last_hit].y-bb.first.y)<epsilon) {
corner.y = bb.first.y;
}
else if (std::fabs(contour[last_hit].y-bb.second.y)<epsilon) {
corner.y = bb.second.y;
}
curmesh.mVerts.emplace_back(corner.x, corner.y, 0.0f);
}
else if (cnt == 1) {
// avoid degenerate polygons (also known as lines or points)
curmesh.mVerts.erase(curmesh.mVerts.begin()+old,curmesh.mVerts.end());
}
if (const size_t d = curmesh.mVerts.size()-old) {
curmesh.mVertcnt.push_back(static_cast<unsigned int>(d));
std::reverse(curmesh.mVerts.rbegin(),curmesh.mVerts.rbegin()+d);
}
if (n == very_first_hit) {
break;
}
}
else {
very_first_hit = n;
}
last_hit = n;
}
}
}
}
// ------------------------------------------------------------------------------------------------
void MergeWindowContours (const std::vector<IfcVector2>& a,
const std::vector<IfcVector2>& b,
ClipperLib::ExPolygons& out)
{
out.clear();
ClipperLib::Clipper clipper;
ClipperLib::Polygon clip;
for(const IfcVector2& pip : a) {
clip.emplace_back(to_int64(pip.x), to_int64(pip.y));
}
if (ClipperLib::Orientation(clip)) {
std::reverse(clip.begin(), clip.end());
}
clipper.AddPolygon(clip, ClipperLib::ptSubject);
clip.clear();
for(const IfcVector2& pip : b) {
clip.emplace_back(to_int64(pip.x), to_int64(pip.y));
}
if (ClipperLib::Orientation(clip)) {
std::reverse(clip.begin(), clip.end());
}
clipper.AddPolygon(clip, ClipperLib::ptSubject);
clipper.Execute(ClipperLib::ctUnion, out,ClipperLib::pftNonZero,ClipperLib::pftNonZero);
}
// ------------------------------------------------------------------------------------------------
// Subtract a from b
void MakeDisjunctWindowContours (const std::vector<IfcVector2>& a,
const std::vector<IfcVector2>& b,
ClipperLib::ExPolygons& out)
{
out.clear();
ClipperLib::Clipper clipper;
ClipperLib::Polygon clip;
for(const IfcVector2& pip : a) {
clip.emplace_back(to_int64(pip.x), to_int64(pip.y));
}
if (ClipperLib::Orientation(clip)) {
std::reverse(clip.begin(), clip.end());
}
clipper.AddPolygon(clip, ClipperLib::ptClip);
clip.clear();
for(const IfcVector2& pip : b) {
clip.emplace_back(to_int64(pip.x), to_int64(pip.y));
}
if (ClipperLib::Orientation(clip)) {
std::reverse(clip.begin(), clip.end());
}
clipper.AddPolygon(clip, ClipperLib::ptSubject);
clipper.Execute(ClipperLib::ctDifference, out,ClipperLib::pftNonZero,ClipperLib::pftNonZero);
}
// ------------------------------------------------------------------------------------------------
void CleanupWindowContour(ProjectedWindowContour& window)
{
std::vector<IfcVector2> scratch;
std::vector<IfcVector2>& contour = window.contour;
ClipperLib::Polygon subject;
ClipperLib::Clipper clipper;
ClipperLib::ExPolygons clipped;
for(const IfcVector2& pip : contour) {
subject.emplace_back(to_int64(pip.x), to_int64(pip.y));
}
clipper.AddPolygon(subject,ClipperLib::ptSubject);
clipper.Execute(ClipperLib::ctUnion,clipped,ClipperLib::pftNonZero,ClipperLib::pftNonZero);
// This should yield only one polygon or something went wrong
if (clipped.size() != 1) {
// Empty polygon? drop the contour altogether
if(clipped.empty()) {
IFCImporter::LogError("error during polygon clipping, window contour is degenerate");
window.FlagInvalid();
return;
}
// Else: take the first only
IFCImporter::LogError("error during polygon clipping, window contour is not convex");
}
ExtractVerticesFromClipper(clipped[0].outer, scratch);
// Assume the bounding box doesn't change during this operation
}
// ------------------------------------------------------------------------------------------------
void CleanupWindowContours(ContourVector& contours)
{
// Use PolyClipper to clean up window contours
try {
for(ProjectedWindowContour& window : contours) {
CleanupWindowContour(window);
}
}
catch (const char* sx) {
IFCImporter::LogError("error during polygon clipping, window shape may be wrong: (Clipper: "
+ std::string(sx) + ")");
}
}
// ------------------------------------------------------------------------------------------------
void CleanupOuterContour(const std::vector<IfcVector2>& contour_flat, TempMesh& curmesh)
{
std::vector<IfcVector3> vold;
std::vector<unsigned int> iold;
vold.reserve(curmesh.mVerts.size());
iold.reserve(curmesh.mVertcnt.size());
// Fix the outer contour using polyclipper
try {
ClipperLib::Polygon subject;
ClipperLib::Clipper clipper;
ClipperLib::ExPolygons clipped;
ClipperLib::Polygon clip;
clip.reserve(contour_flat.size());
for(const IfcVector2& pip : contour_flat) {
clip.emplace_back(to_int64(pip.x), to_int64(pip.y));
}
if (!ClipperLib::Orientation(clip)) {
std::reverse(clip.begin(), clip.end());
}
// We need to run polyclipper on every single polygon -- we can't run it one all
// of them at once or it would merge them all together which would undo all
// previous steps
subject.reserve(4);
size_t index = 0;
size_t countdown = 0;
for(const IfcVector3& pip : curmesh.mVerts) {
if (!countdown) {
countdown = curmesh.mVertcnt[index++];
if (!countdown) {
continue;
}
}
subject.emplace_back(to_int64(pip.x), to_int64(pip.y));
if (--countdown == 0) {
if (!ClipperLib::Orientation(subject)) {
std::reverse(subject.begin(), subject.end());
}
clipper.AddPolygon(subject,ClipperLib::ptSubject);
clipper.AddPolygon(clip,ClipperLib::ptClip);
clipper.Execute(ClipperLib::ctIntersection,clipped,ClipperLib::pftNonZero,ClipperLib::pftNonZero);
for(const ClipperLib::ExPolygon& ex : clipped) {
iold.push_back(static_cast<unsigned int>(ex.outer.size()));
for(const ClipperLib::IntPoint& point : ex.outer) {
vold.emplace_back(
from_int64(point.X),
from_int64(point.Y),
0.0f);
}
}
subject.clear();
clipped.clear();
clipper.Clear();
}
}
}
catch (const char* sx) {
IFCImporter::LogError("Ifc: error during polygon clipping, wall contour line may be wrong: (Clipper: "
+ std::string(sx) + ")");
return;
}
// swap data arrays
std::swap(vold,curmesh.mVerts);
std::swap(iold,curmesh.mVertcnt);
}
typedef std::vector<TempOpening*> OpeningRefs;
typedef std::vector<OpeningRefs > OpeningRefVector;
typedef std::vector<std::pair<
ContourVector::const_iterator,
Contour::const_iterator>
> ContourRefVector;
// ------------------------------------------------------------------------------------------------
bool BoundingBoxesAdjacent(const BoundingBox& bb, const BoundingBox& ibb)
{
// TODO: I'm pretty sure there is a much more compact way to check this
const IfcFloat epsilon = Math::getEpsilon<float>();
return (std::fabs(bb.second.x - ibb.first.x) < epsilon && bb.first.y <= ibb.second.y && bb.second.y >= ibb.first.y) ||
(std::fabs(bb.first.x - ibb.second.x) < epsilon && ibb.first.y <= bb.second.y && ibb.second.y >= bb.first.y) ||
(std::fabs(bb.second.y - ibb.first.y) < epsilon && bb.first.x <= ibb.second.x && bb.second.x >= ibb.first.x) ||
(std::fabs(bb.first.y - ibb.second.y) < epsilon && ibb.first.x <= bb.second.x && ibb.second.x >= bb.first.x);
}
// ------------------------------------------------------------------------------------------------
// Check if m0,m1 intersects n0,n1 assuming same ordering of the points in the line segments
// output the intersection points on n0,n1
bool IntersectingLineSegments(const IfcVector2& n0, const IfcVector2& n1,
const IfcVector2& m0, const IfcVector2& m1,
IfcVector2& out0, IfcVector2& out1)
{
const IfcVector2 n0_to_n1 = n1 - n0;
const IfcVector2 n0_to_m0 = m0 - n0;
const IfcVector2 n1_to_m1 = m1 - n1;
const IfcVector2 n0_to_m1 = m1 - n0;
const IfcFloat e = 1e-5f;
const IfcFloat smalle = 1e-9f;
static const IfcFloat inf = std::numeric_limits<IfcFloat>::infinity();
if (!(n0_to_m0.SquareLength() < e*e || std::fabs(n0_to_m0 * n0_to_n1) / (n0_to_m0.Length() * n0_to_n1.Length()) > 1-1e-5 )) {
return false;
}
if (!(n1_to_m1.SquareLength() < e*e || std::fabs(n1_to_m1 * n0_to_n1) / (n1_to_m1.Length() * n0_to_n1.Length()) > 1-1e-5 )) {
return false;
}
IfcFloat s0;
IfcFloat s1;
// pick the axis with the higher absolute difference so the result
// is more accurate. Since we cannot guarantee that the axis with
// the higher absolute difference is big enough as to avoid
// divisions by zero, the case 0/0 ~ infinity is detected and
// handled separately.
if(std::fabs(n0_to_n1.x) > std::fabs(n0_to_n1.y)) {
s0 = n0_to_m0.x / n0_to_n1.x;
s1 = n0_to_m1.x / n0_to_n1.x;
if (std::fabs(s0) == inf && std::fabs(n0_to_m0.x) < smalle) {
s0 = 0.;
}
if (std::fabs(s1) == inf && std::fabs(n0_to_m1.x) < smalle) {
s1 = 0.;
}
}
else {
s0 = n0_to_m0.y / n0_to_n1.y;
s1 = n0_to_m1.y / n0_to_n1.y;
if (std::fabs(s0) == inf && std::fabs(n0_to_m0.y) < smalle) {
s0 = 0.;
}
if (std::fabs(s1) == inf && std::fabs(n0_to_m1.y) < smalle) {
s1 = 0.;
}
}
if (s1 < s0) {
std::swap(s1,s0);
}
s0 = std::max(0.0,s0);
s1 = std::max(0.0,s1);
s0 = std::min(1.0,s0);
s1 = std::min(1.0,s1);
if (std::fabs(s1-s0) < e) {
return false;
}
out0 = n0 + s0 * n0_to_n1;
out1 = n0 + s1 * n0_to_n1;
return true;
}
// ------------------------------------------------------------------------------------------------
void FindAdjacentContours(ContourVector::iterator current, const ContourVector& contours)
{
const IfcFloat sqlen_epsilon = static_cast<IfcFloat>(Math::getEpsilon<float>());
const BoundingBox& bb = (*current).bb;
// What is to be done here is to populate the skip lists for the contour
// and to add necessary padding points when needed.
SkipList& skiplist = (*current).skiplist;
// First step to find possible adjacent contours is to check for adjacent bounding
// boxes. If the bounding boxes are not adjacent, the contours lines cannot possibly be.
for (ContourVector::const_iterator it = contours.begin(), end = contours.end(); it != end; ++it) {
if ((*it).IsInvalid()) {
continue;
}
// this left here to make clear we also run on the current contour
// to check for overlapping contour segments (which can happen due
// to projection artifacts).
//if(it == current) {
// continue;
//}
const bool is_me = it == current;
const BoundingBox& ibb = (*it).bb;
// Assumption: the bounding boxes are pairwise disjoint or identical
ai_assert(is_me || !BoundingBoxesOverlapping(bb, ibb));
if (is_me || BoundingBoxesAdjacent(bb, ibb)) {
// Now do a each-against-everyone check for intersecting contour
// lines. This obviously scales terribly, but in typical real
// world Ifc files it will not matter since most windows that
// are adjacent to each others are rectangular anyway.
Contour& ncontour = (*current).contour;
const Contour& mcontour = (*it).contour;
for (size_t n = 0; n < ncontour.size(); ++n) {
const IfcVector2 n0 = ncontour[n];
const IfcVector2 n1 = ncontour[(n+1) % ncontour.size()];
for (size_t m = 0, mend = (is_me ? n : mcontour.size()); m < mend; ++m) {
ai_assert(&mcontour != &ncontour || m < n);
const IfcVector2 m0 = mcontour[m];
const IfcVector2 m1 = mcontour[(m+1) % mcontour.size()];
IfcVector2 isect0, isect1;
if (IntersectingLineSegments(n0,n1, m0, m1, isect0, isect1)) {
if ((isect0 - n0).SquareLength() > sqlen_epsilon) {
++n;
ncontour.insert(ncontour.begin() + n, isect0);
skiplist.insert(skiplist.begin() + n, true);
}
else {
skiplist[n] = true;
}
if ((isect1 - n1).SquareLength() > sqlen_epsilon) {
++n;
ncontour.insert(ncontour.begin() + n, isect1);
skiplist.insert(skiplist.begin() + n, false);
}
}
}
}
}
}
}
// ------------------------------------------------------------------------------------------------
AI_FORCE_INLINE bool LikelyBorder(const IfcVector2& vdelta)
{
const IfcFloat dot_point_epsilon = static_cast<IfcFloat>(Math::getEpsilon<float>());
return std::fabs(vdelta.x * vdelta.y) < dot_point_epsilon;
}
// ------------------------------------------------------------------------------------------------
void FindBorderContours(ContourVector::iterator current)
{
const IfcFloat border_epsilon_upper = static_cast<IfcFloat>(1-1e-4);
const IfcFloat border_epsilon_lower = static_cast<IfcFloat>(1e-4);
bool outer_border = false;
bool start_on_outer_border = false;
SkipList& skiplist = (*current).skiplist;
IfcVector2 last_proj_point;
const Contour::const_iterator cbegin = (*current).contour.begin(), cend = (*current).contour.end();
for (Contour::const_iterator cit = cbegin; cit != cend; ++cit) {
const IfcVector2& proj_point = *cit;
// Check if this connection is along the outer boundary of the projection
// plane. In such a case we better drop it because such 'edges' should
// not have any geometry to close them (think of door openings).
if (proj_point.x <= border_epsilon_lower || proj_point.x >= border_epsilon_upper ||
proj_point.y <= border_epsilon_lower || proj_point.y >= border_epsilon_upper) {
if (outer_border) {
ai_assert(cit != cbegin);
if (LikelyBorder(proj_point - last_proj_point)) {
skiplist[std::distance(cbegin, cit) - 1] = true;
}
}
else if (cit == cbegin) {
start_on_outer_border = true;
}
outer_border = true;
}
else {
outer_border = false;
}
last_proj_point = proj_point;
}
// handle last segment
if (outer_border && start_on_outer_border) {
const IfcVector2& proj_point = *cbegin;
if (LikelyBorder(proj_point - last_proj_point)) {
skiplist[skiplist.size()-1] = true;
}
}
}
// ------------------------------------------------------------------------------------------------
AI_FORCE_INLINE bool LikelyDiagonal(IfcVector2 vdelta)
{
vdelta.x = std::fabs(vdelta.x);
vdelta.y = std::fabs(vdelta.y);
return (std::fabs(vdelta.x-vdelta.y) < 0.8 * std::max(vdelta.x, vdelta.y));
}
// ------------------------------------------------------------------------------------------------
void FindLikelyCrossingLines(ContourVector::iterator current)
{
SkipList& skiplist = (*current).skiplist;
IfcVector2 last_proj_point;
const Contour::const_iterator cbegin = (*current).contour.begin(), cend = (*current).contour.end();
for (Contour::const_iterator cit = cbegin; cit != cend; ++cit) {
const IfcVector2& proj_point = *cit;
if (cit != cbegin) {
IfcVector2 vdelta = proj_point - last_proj_point;
if (LikelyDiagonal(vdelta)) {
skiplist[std::distance(cbegin, cit) - 1] = true;
}
}
last_proj_point = proj_point;
}
// handle last segment
if (LikelyDiagonal(*cbegin - last_proj_point)) {
skiplist[skiplist.size()-1] = true;
}
}
// ------------------------------------------------------------------------------------------------
size_t CloseWindows(ContourVector& contours,
const IfcMatrix4& minv,
OpeningRefVector& contours_to_openings,
TempMesh& curmesh)
{
size_t closed = 0;
// For all contour points, check if one of the assigned openings does
// already have points assigned to it. In this case, assume this is
// the other side of the wall and generate connections between
// the two holes in order to close the window.
// All this gets complicated by the fact that contours may pertain to
// multiple openings(due to merging of adjacent or overlapping openings).
// The code is based on the assumption that this happens symmetrically
// on both sides of the wall. If it doesn't (which would be a bug anyway)
// wrong geometry may be generated.
for (ContourVector::iterator it = contours.begin(), end = contours.end(); it != end; ++it) {
if ((*it).IsInvalid()) {
continue;
}
OpeningRefs& refs = contours_to_openings[std::distance(contours.begin(), it)];
bool has_other_side = false;
for(const TempOpening* opening : refs) {
if(!opening->wallPoints.empty()) {
has_other_side = true;
break;
}
}
if (has_other_side) {
ContourRefVector adjacent_contours;
// prepare a skiplist for this contour. The skiplist is used to
// eliminate unwanted contour lines for adjacent windows and
// those bordering the outer frame.
(*it).PrepareSkiplist();
FindAdjacentContours(it, contours);
FindBorderContours(it);
// if the window is the result of a finite union or intersection of rectangles,
// there shouldn't be any crossing or diagonal lines in it. Such lines would
// be artifacts caused by numerical inaccuracies or other bugs in polyclipper
// and our own code. Since rectangular openings are by far the most frequent
// case, it is worth filtering for this corner case.
if((*it).is_rectangular) {
FindLikelyCrossingLines(it);
}
ai_assert((*it).skiplist.size() == (*it).contour.size());
SkipList::const_iterator skipbegin = (*it).skiplist.begin();
curmesh.mVerts.reserve(curmesh.mVerts.size() + (*it).contour.size() * 4);
curmesh.mVertcnt.reserve(curmesh.mVertcnt.size() + (*it).contour.size());
bool reverseCountourFaces = false;
// compare base poly normal and contour normal to detect if we need to reverse the face winding
if(curmesh.mVertcnt.size() > 0) {
IfcVector3 basePolyNormal = TempMesh::ComputePolygonNormal(curmesh.mVerts.data(), curmesh.mVertcnt.front());
std::vector<IfcVector3> worldSpaceContourVtx(it->contour.size());
for(size_t a = 0; a < it->contour.size(); ++a)
worldSpaceContourVtx[a] = minv * IfcVector3(it->contour[a].x, it->contour[a].y, 0.0);
IfcVector3 contourNormal = TempMesh::ComputePolygonNormal(worldSpaceContourVtx.data(), worldSpaceContourVtx.size());
reverseCountourFaces = (contourNormal * basePolyNormal) > 0.0;
}
// XXX this algorithm is really a bit inefficient - both in terms
// of constant factor and of asymptotic runtime.
std::vector<bool>::const_iterator skipit = skipbegin;
IfcVector3 start0;
IfcVector3 start1;
const Contour::const_iterator cbegin = (*it).contour.begin(), cend = (*it).contour.end();
bool drop_this_edge = false;
for (Contour::const_iterator cit = cbegin; cit != cend; ++cit, drop_this_edge = *skipit++) {
const IfcVector2& proj_point = *cit;
// Locate the closest opposite point. This should be a good heuristic to
// connect only the points that are really intended to be connected.
IfcFloat best = static_cast<IfcFloat>(1e10);
IfcVector3 bestv;
const IfcVector3 world_point = minv * IfcVector3(proj_point.x,proj_point.y,0.0f);
for(const TempOpening* opening : refs) {
for(const IfcVector3& other : opening->wallPoints) {
const IfcFloat sqdist = (world_point - other).SquareLength();
if (sqdist < best) {
// avoid self-connections
if(sqdist < 1e-5) {
continue;
}
bestv = other;
best = sqdist;
}
}
}
if (drop_this_edge) {
curmesh.mVerts.pop_back();
curmesh.mVerts.pop_back();
}
else {
curmesh.mVerts.push_back(((cit == cbegin) != reverseCountourFaces) ? world_point : bestv);
curmesh.mVerts.push_back(((cit == cbegin) != reverseCountourFaces) ? bestv : world_point);
curmesh.mVertcnt.push_back(4);
++closed;
}
if (cit == cbegin) {
start0 = world_point;
start1 = bestv;
continue;
}
curmesh.mVerts.push_back(reverseCountourFaces ? bestv : world_point);
curmesh.mVerts.push_back(reverseCountourFaces ? world_point : bestv);
if (cit == cend - 1) {
drop_this_edge = *skipit;
// Check if the final connection (last to first element) is itself
// a border edge that needs to be dropped.
if (drop_this_edge) {
--closed;
curmesh.mVertcnt.pop_back();
curmesh.mVerts.pop_back();
curmesh.mVerts.pop_back();
}
else {
curmesh.mVerts.push_back(reverseCountourFaces ? start0 : start1);
curmesh.mVerts.push_back(reverseCountourFaces ? start1 : start0);
}
}
}
}
else {
const Contour::const_iterator cbegin = (*it).contour.begin(), cend = (*it).contour.end();
for(TempOpening* opening : refs) {
ai_assert(opening->wallPoints.empty());
opening->wallPoints.reserve(opening->wallPoints.capacity() + (*it).contour.size());
for (Contour::const_iterator cit = cbegin; cit != cend; ++cit) {
const IfcVector2& proj_point = *cit;
opening->wallPoints.push_back(minv * IfcVector3(proj_point.x,proj_point.y,0.0f));
}
}
}
}
return closed;
}
// ------------------------------------------------------------------------------------------------
void Quadrify(const std::vector< BoundingBox >& bbs, TempMesh& curmesh)
{
ai_assert(curmesh.IsEmpty());
std::vector<IfcVector2> quads;
quads.reserve(bbs.size()*4);
// sort openings by x and y axis as a preliminiary to the QuadrifyPart() algorithm
XYSortedField field;
for (std::vector<BoundingBox>::const_iterator it = bbs.begin(); it != bbs.end(); ++it) {
if (field.find((*it).first) != field.end()) {
IFCImporter::LogWarn("constraint failure during generation of wall openings, results may be faulty");
}
field[(*it).first] = std::distance(bbs.begin(),it);
}
QuadrifyPart(IfcVector2(),one_vec,field,bbs,quads);
ai_assert(!(quads.size() % 4));
curmesh.mVertcnt.resize(quads.size()/4,4);
curmesh.mVerts.reserve(quads.size());
for(const IfcVector2& v2 : quads) {
curmesh.mVerts.emplace_back(v2.x, v2.y, static_cast<IfcFloat>(0.0));
}
}
// ------------------------------------------------------------------------------------------------
void Quadrify(const ContourVector& contours, TempMesh& curmesh)
{
std::vector<BoundingBox> bbs;
bbs.reserve(contours.size());
for(const ContourVector::value_type& val : contours) {
bbs.push_back(val.bb);
}
Quadrify(bbs, curmesh);
}
// ------------------------------------------------------------------------------------------------
IfcMatrix4 ProjectOntoPlane(std::vector<IfcVector2>& out_contour, const TempMesh& in_mesh,
bool &ok, IfcVector3& nor_out)
{
const std::vector<IfcVector3>& in_verts = in_mesh.mVerts;
ok = true;
IfcMatrix4 m = IfcMatrix4(DerivePlaneCoordinateSpace(in_mesh, ok, nor_out));
if(!ok) {
return IfcMatrix4();
}
#ifdef ASSIMP_BUILD_DEBUG
const IfcFloat det = m.Determinant();
ai_assert(std::fabs(det-1) < 1e-5);
#endif
IfcFloat zcoord = 0;
out_contour.reserve(in_verts.size());
IfcVector3 vmin, vmax;
MinMaxChooser<IfcVector3>()(vmin, vmax);
// Project all points into the new coordinate system, collect min/max verts on the way
for(const IfcVector3& x : in_verts) {
const IfcVector3 vv = m * x;
// keep Z offset in the plane coordinate system. Ignoring precision issues
// (which are present, of course), this should be the same value for
// all polygon vertices (assuming the polygon is planar).
// XXX this should be guarded, but we somehow need to pick a suitable
// epsilon
// if(coord != -1.0f) {
// assert(std::fabs(coord - vv.z) < 1e-3f);
// }
zcoord += vv.z;
vmin = std::min(vv, vmin);
vmax = std::max(vv, vmax);
out_contour.emplace_back(vv.x,vv.y);
}
zcoord /= in_verts.size();
// Further improve the projection by mapping the entire working set into
// [0,1] range. This gives us a consistent data range so all epsilons
// used below can be constants.
vmax -= vmin;
for(IfcVector2& vv : out_contour) {
vv.x = (vv.x - vmin.x) / vmax.x;
vv.y = (vv.y - vmin.y) / vmax.y;
// sanity rounding
vv = std::max(vv,IfcVector2());
vv = std::min(vv,one_vec);
}
IfcMatrix4 mult;
mult.a1 = static_cast<IfcFloat>(1.0) / vmax.x;
mult.b2 = static_cast<IfcFloat>(1.0) / vmax.y;
mult.a4 = -vmin.x * mult.a1;
mult.b4 = -vmin.y * mult.b2;
mult.c4 = -zcoord;
m = mult * m;
// debug code to verify correctness
#ifdef ASSIMP_BUILD_DEBUG
std::vector<IfcVector2> out_contour2;
for(const IfcVector3& x : in_verts) {
const IfcVector3& vv = m * x;
out_contour2.emplace_back(vv.x,vv.y);
ai_assert(std::fabs(vv.z) < vmax.z + 1e-8);
}
for(size_t i = 0; i < out_contour.size(); ++i) {
ai_assert((out_contour[i] - out_contour2[i]).SquareLength() < ai_epsilon);
}
#endif
return m;
}
// ------------------------------------------------------------------------------------------------
bool GenerateOpenings(std::vector<TempOpening>& openings,
TempMesh& curmesh,
bool check_intersection,
bool generate_connection_geometry,
const IfcVector3& wall_extrusion_axis)
{
OpeningRefVector contours_to_openings;
// Try to derive a solid base plane within the current surface for use as
// working coordinate system. Map all vertices onto this plane and
// rescale them to [0,1] range. This normalization means all further
// epsilons need not be scaled.
bool ok = true;
std::vector<IfcVector2> contour_flat;
IfcVector3 nor;
const IfcMatrix4 m = ProjectOntoPlane(contour_flat, curmesh, ok, nor);
if(!ok) {
return false;
}
// Obtain inverse transform for getting back to world space later on
const IfcMatrix4 minv = IfcMatrix4(m).Inverse();
// Compute bounding boxes for all 2D openings in projection space
ContourVector contours;
std::vector<IfcVector2> temp_contour;
std::vector<IfcVector2> temp_contour2;
IfcVector3 wall_extrusion_axis_norm = wall_extrusion_axis;
wall_extrusion_axis_norm.Normalize();
for(TempOpening& opening :openings) {
// extrusionDir may be 0,0,0 on case where the opening mesh is not an
// IfcExtrudedAreaSolid but something else (i.e. a brep)
IfcVector3 norm_extrusion_dir = opening.extrusionDir;
if (norm_extrusion_dir.SquareLength() > 1e-10) {
norm_extrusion_dir.Normalize();
}
else {
norm_extrusion_dir = IfcVector3();
}
TempMesh* profile_data = opening.profileMesh.get();
bool is_2d_source = false;
if (opening.profileMesh2D && norm_extrusion_dir.SquareLength() > 0) {
if (std::fabs(norm_extrusion_dir * nor) > 0.9) {
profile_data = opening.profileMesh2D.get();
is_2d_source = true;
}
}
std::vector<IfcVector3> profile_verts = profile_data->mVerts;
std::vector<unsigned int> profile_vertcnts = profile_data->mVertcnt;
if(profile_verts.size() <= 2) {
continue;
}
// The opening meshes are real 3D meshes so skip over all faces
// clearly facing into the wrong direction. Also, we need to check
// whether the meshes do actually intersect the base surface plane.
// This is done by recording minimum and maximum values for the
// d component of the plane equation for all polys and checking
// against surface d.
// Use the sign of the dot product of the face normal to the plane
// normal to determine to which side of the difference mesh a
// triangle belongs. Get independent bounding boxes and vertex
// sets for both sides and take the better one (we can't just
// take both - this would likely cause major screwup of vertex
// winding, producing errors as late as in CloseWindows()).
IfcFloat dmin, dmax;
MinMaxChooser<IfcFloat>()(dmin,dmax);
temp_contour.clear();
temp_contour2.clear();
IfcVector2 vpmin,vpmax;
MinMaxChooser<IfcVector2>()(vpmin,vpmax);
IfcVector2 vpmin2,vpmax2;
MinMaxChooser<IfcVector2>()(vpmin2,vpmax2);
for (size_t f = 0, vi_total = 0, fend = profile_vertcnts.size(); f < fend; ++f) {
bool side_flag = true;
if (!is_2d_source) {
const IfcVector3 face_nor = ((profile_verts[vi_total+2] - profile_verts[vi_total]) ^
(profile_verts[vi_total+1] - profile_verts[vi_total])).Normalize();
const IfcFloat abs_dot_face_nor = std::abs(nor * face_nor);
if (abs_dot_face_nor < 0.9) {
vi_total += profile_vertcnts[f];
continue;
}
side_flag = nor * face_nor > 0;
}
for (unsigned int vi = 0, vend = profile_vertcnts[f]; vi < vend; ++vi, ++vi_total) {
const IfcVector3& x = profile_verts[vi_total];
const IfcVector3 v = m * x;
IfcVector2 vv(v.x, v.y);
//if(check_intersection) {
dmin = std::min(dmin, v.z);
dmax = std::max(dmax, v.z);
//}
// sanity rounding
vv = std::max(vv,IfcVector2());
vv = std::min(vv,one_vec);
if(side_flag) {
vpmin = std::min(vpmin,vv);
vpmax = std::max(vpmax,vv);
}
else {
vpmin2 = std::min(vpmin2,vv);
vpmax2 = std::max(vpmax2,vv);
}
std::vector<IfcVector2>& store = side_flag ? temp_contour : temp_contour2;
if (!IsDuplicateVertex(vv, store)) {
store.push_back(vv);
}
}
}
if (temp_contour2.size() > 2) {
ai_assert(!is_2d_source);
const IfcVector2 area = vpmax-vpmin;
const IfcVector2 area2 = vpmax2-vpmin2;
if (temp_contour.size() <= 2 || std::fabs(area2.x * area2.y) > std::fabs(area.x * area.y)) {
temp_contour.swap(temp_contour2);
vpmax = vpmax2;
vpmin = vpmin2;
}
}
if(temp_contour.size() <= 2) {
continue;
}
// TODO: This epsilon may be too large
const IfcFloat epsilon = std::fabs(dmax-dmin) * 0.0001;
if (!is_2d_source && check_intersection && (0 < dmin-epsilon || 0 > dmax+epsilon)) {
continue;
}
BoundingBox bb = BoundingBox(vpmin,vpmax);
// Skip over very small openings - these are likely projection errors
// (i.e. they don't belong to this side of the wall)
if(std::fabs(vpmax.x - vpmin.x) * std::fabs(vpmax.y - vpmin.y) < static_cast<IfcFloat>(1e-10)) {
continue;
}
std::vector<TempOpening*> joined_openings(1, &opening);
bool is_rectangle = temp_contour.size() == 4;
// See if this BB intersects or is in close adjacency to any other BB we have so far.
for (ContourVector::iterator it = contours.begin(); it != contours.end(); ) {
const BoundingBox& ibb = (*it).bb;
if (BoundingBoxesOverlapping(ibb, bb)) {
if (!(*it).is_rectangular) {
is_rectangle = false;
}
const std::vector<IfcVector2>& other = (*it).contour;
ClipperLib::ExPolygons poly;
// First check whether subtracting the old contour (to which ibb belongs)
// from the new contour (to which bb belongs) yields an updated bb which
// no longer overlaps ibb
MakeDisjunctWindowContours(other, temp_contour, poly);
if(poly.size() == 1) {
const BoundingBox newbb = GetBoundingBox(poly[0].outer);
if (!BoundingBoxesOverlapping(ibb, newbb )) {
// Good guy bounding box
bb = newbb ;
ExtractVerticesFromClipper(poly[0].outer, temp_contour, false);
continue;
}
}
// Take these two overlapping contours and try to merge them. If they
// overlap (which should not happen, but in fact happens-in-the-real-
// world [tm] ), resume using a single contour and a single bounding box.
MergeWindowContours(temp_contour, other, poly);
if (poly.size() > 1) {
return TryAddOpenings_Poly2Tri(openings, curmesh);
}
else if (poly.size() == 0) {
IFCImporter::LogWarn("ignoring duplicate opening");
temp_contour.clear();
break;
}
else {
IFCImporter::LogVerboseDebug("merging overlapping openings");
ExtractVerticesFromClipper(poly[0].outer, temp_contour, false);
// Generate the union of the bounding boxes
bb.first = std::min(bb.first, ibb.first);
bb.second = std::max(bb.second, ibb.second);
// Update contour-to-opening tables accordingly
if (generate_connection_geometry) {
std::vector<TempOpening*>& t = contours_to_openings[std::distance(contours.begin(),it)];
joined_openings.insert(joined_openings.end(), t.begin(), t.end());
contours_to_openings.erase(contours_to_openings.begin() + std::distance(contours.begin(),it));
}
contours.erase(it);
// Restart from scratch because the newly formed BB might now
// overlap any other BB which its constituent BBs didn't
// previously overlap.
it = contours.begin();
continue;
}
}
++it;
}
if(!temp_contour.empty()) {
if (generate_connection_geometry) {
contours_to_openings.emplace_back(
joined_openings.begin(),
joined_openings.end());
}
contours.emplace_back(temp_contour, bb, is_rectangle);
}
}
// Check if we still have any openings left - it may well be that this is
// not the cause, for example if all the opening candidates don't intersect
// this surface or point into a direction perpendicular to it.
if (contours.empty()) {
return false;
}
curmesh.Clear();
// Generate a base subdivision into quads to accommodate the given list
// of window bounding boxes.
Quadrify(contours,curmesh);
// Run a sanity cleanup pass on the window contours to avoid generating
// artifacts during the contour generation phase later on.
CleanupWindowContours(contours);
// Previously we reduced all windows to rectangular AABBs in projection
// space, now it is time to fill the gaps between the BBs and the real
// window openings.
InsertWindowContours(contours,openings, curmesh);
// Clip the entire outer contour of our current result against the real
// outer contour of the surface. This is necessary because the result
// of the Quadrify() algorithm is always a square area spanning
// over [0,1]^2 (i.e. entire projection space).
CleanupOuterContour(contour_flat, curmesh);
// Undo the projection and get back to world (or local object) space
for(IfcVector3& v3 : curmesh.mVerts) {
v3 = minv * v3;
}
// Generate window caps to connect the symmetric openings on both sides
// of the wall.
if (generate_connection_geometry) {
CloseWindows(contours, minv, contours_to_openings, curmesh);
}
return true;
}
std::vector<IfcVector2> GetContourInPlane2D(const std::shared_ptr<TempMesh>& mesh,IfcMatrix3 planeSpace,
IfcVector3 planeNor,IfcFloat planeOffset,
IfcVector3 extrusionDir,IfcVector3& wall_extrusion,bool& first,bool& ok) {
std::vector<IfcVector2> contour;
const auto outernor = ((mesh->mVerts[2] - mesh->mVerts[0]) ^ (mesh->mVerts[1] - mesh->mVerts[0])).Normalize();
const IfcFloat dot = planeNor * outernor;
if (std::fabs(dot) < 1.f - ai_epsilon) {
std::stringstream msg;
msg << "Skipping: Unaligned opening (" << planeNor.x << ", " << planeNor.y << ", " << planeNor.z << ")";
msg << " . ( " << outernor.x << ", " << outernor.y << ", " << outernor.z << ") = " << dot;
IFCImporter::LogDebug(msg.str().c_str());
ok = false;
return contour;
}
const std::vector<IfcVector3>& va = mesh->mVerts;
if(va.size() <= 2) {
std::stringstream msg;
msg << "Skipping: Only " << va.size() << " verticies in opening mesh.";
IFCImporter::LogDebug(msg.str().c_str());
ok = false;
return contour;
}
for(const IfcVector3& xx : mesh->mVerts) {
IfcVector3 vv = planeSpace * xx,vv_extr = planeSpace * (xx + extrusionDir);
const bool is_extruded_side = std::fabs(vv.z - planeOffset) > std::fabs(vv_extr.z - planeOffset);
if(first) {
first = false;
if(dot > 0.f) {
wall_extrusion = extrusionDir;
if(is_extruded_side) {
wall_extrusion = -wall_extrusion;
}
}
}
// XXX should not be necessary - but it is. Why? For precision reasons?
vv = is_extruded_side ? vv_extr : vv;
contour.emplace_back(vv.x,vv.y);
}
ok = true;
return contour;
}
const ai_real close{ ai_epsilon };
static bool isClose(IfcVector2 first,IfcVector2 second) {
auto diff = (second - first);
return (std::fabs(diff.x) < close && std::fabs(diff.y) < close);
}
static void logSegment(std::pair<IfcVector2,IfcVector2> segment) {
std::stringstream msg2;
msg2 << " Segment: \n";
msg2 << " " << segment.first.x << " " << segment.first.y << " \n";
msg2 << " " << segment.second.x << " " << segment.second.y << " \n";
IFCImporter::LogInfo(msg2.str().c_str());
}
std::vector<std::vector<IfcVector2>> GetContoursInPlane3D(const std::shared_ptr<TempMesh>& mesh,IfcMatrix3 planeSpace,
IfcFloat planeOffset) {
{
std::stringstream msg;
msg << "GetContoursInPlane3D: planeSpace is \n";
msg << planeSpace.a1 << " " << planeSpace.a2 << " " << planeSpace.a3 << " " << "\n";
msg << planeSpace.b1 << " " << planeSpace.b2 << " " << planeSpace.b3 << " " << "\n";
msg << planeSpace.c1 << " " << planeSpace.c2 << " " << planeSpace.c3 << " " << "\n";
msg << "\n planeOffset is " << planeOffset;
IFCImporter::LogInfo(msg.str().c_str());
}
// we'll put our line segments in here, and then merge them together into contours later
std::deque<std::pair<IfcVector2,IfcVector2>> lineSegments;
// find the lines giving the intersection of the faces with the plane - we'll work in planeSpace throughout.
size_t vI0{ 0 }; // vertex index for first vertex in plane
for(auto nVertices : mesh->mVertcnt) { // iterate over faces
{
std::stringstream msg;
msg << "GetContoursInPlane3D: face (transformed) is \n";
for(auto vI = vI0; vI < vI0 + nVertices; vI++) {
auto v = planeSpace * mesh->mVerts[vI];
msg << " " << v.x << " " << v.y << " " << v.z << " " << "\n";
}
IFCImporter::LogInfo(msg.str().c_str());
}
if(nVertices <= 2) // not a plane, a point or line
{
std::stringstream msg;
msg << "GetContoursInPlane3D: found point or line when expecting plane (only " << nVertices << " vertices)";
IFCImporter::LogWarn(msg.str().c_str());
vI0 += nVertices;
continue;
}
auto v0 = planeSpace * mesh->mVerts[vI0];
// now calculate intersections between face and plane
IfcVector2 firstPoint;
bool gotFirstPoint(false);
if(std::fabs(v0.z - planeOffset) < close) {
// first point is on the plane
firstPoint.x = v0.x;
firstPoint.y = v0.y;
gotFirstPoint = true;
}
auto vn = v0;
for(auto vI = vI0 + 1; vI < vI0 + nVertices; vI++) {
auto vp = vn;
vn = planeSpace * mesh->mVerts[vI];
IfcVector3 intersection;
if(std::fabs(vn.z - planeOffset) < close) {
// on the plane
intersection = vn;
}
else if((vn.z > planeOffset) != (vp.z > planeOffset))
{
// passes through the plane
auto vdir = vn - vp;
auto scale = (planeOffset - vp.z) / vdir.z;
intersection = vp + scale * vdir;
}
else {
// nowhere near - move on
continue;
}
if(!gotFirstPoint) {
if(std::fabs(vp.z - planeOffset) < close) {
// just had a second line along the plane
firstPoint.x = vp.x;
firstPoint.y = vp.y;
IfcVector2 secondPoint(intersection.x,intersection.y);
auto s = std::pair<IfcVector2,IfcVector2>(firstPoint,secondPoint);
logSegment(s);
lineSegments.push_back(s);
// next firstpoint should be this one
}
else {
// store the first intersection point
firstPoint.x = intersection.x;
firstPoint.y = intersection.y;
gotFirstPoint = true;
}
}
else {
// now got the second point, so store the pair
IfcVector2 secondPoint(intersection.x,intersection.y);
auto s = std::pair<IfcVector2,IfcVector2>(firstPoint,secondPoint);
logSegment(s);
lineSegments.push_back(s);
// - note that we don't move onto the next face as a non-convex face can create two or more intersections with a plane
gotFirstPoint = false;
}
}
if(gotFirstPoint) {
IFCImporter::LogWarn("GetContoursInPlane3D: odd number of intersections with plane");
}
vI0 += nVertices;
}
{
std::stringstream msg;
msg << "GetContoursInPlane3D: found " << lineSegments.size() << " line segments:\n";
IFCImporter::LogInfo(msg.str().c_str());
for(auto& s : lineSegments) {
logSegment(s);
}
}
// now merge contours until we have the best-looking polygons we can
std::vector<Contour> contours;
while(!lineSegments.empty()) {
// start with a polygon and make the best closed contour we can
const auto& firstSeg = lineSegments.front();
std::deque<IfcVector2> contour{ firstSeg.first, firstSeg.second };
lineSegments.pop_front();
bool foundNextPoint{ true };
bool closedContour{ false };
while(foundNextPoint) {
foundNextPoint = false;
for(auto nextSeg = lineSegments.begin(); nextSeg != lineSegments.end(); nextSeg++) {
// see if we can match up both ends - in which case we've closed the contour
if((isClose(contour.front(),nextSeg->first) && isClose(contour.back(),nextSeg->second)) ||
(isClose(contour.back(),nextSeg->first) && isClose(contour.front(),nextSeg->second))
) {
lineSegments.erase(nextSeg);
closedContour = true;
break;
}
// otherwise, see if we can match up either end
foundNextPoint = true;
if(isClose(contour.front(),nextSeg->first)) {
contour.push_front(nextSeg->second);
}
else if(isClose(contour.front(),nextSeg->second)) {
contour.push_front(nextSeg->first);
}
else if(isClose(contour.back(),nextSeg->first)) {
contour.push_back(nextSeg->second);
}
else if(isClose(contour.back(),nextSeg->second)) {
contour.push_back(nextSeg->first);
}
else {
foundNextPoint = false;
}
if(foundNextPoint) {
lineSegments.erase(nextSeg);
break;
}
}
}
if(!closedContour) {
IFCImporter::LogWarn("GetContoursInPlane3D: did not close contour");
}
// now add the contour if we can
if(contour.size() <= 2) {
IFCImporter::LogWarn("GetContoursInPlane3D: discarding line/point contour");
continue;
}
Contour c{};
for(auto p : contour)
{
c.push_back(p);
}
contours.push_back(c);
}
{
std::stringstream msg;
msg << "GetContoursInPlane3D: found " << contours.size() << " contours:\n";
for(const auto& c : contours) {
msg << " Contour: \n";
for(auto p : c) {
msg << " " << p.x << " " << p.y << " \n";
}
}
IFCImporter::LogInfo(msg.str().c_str());
}
return contours;
}
std::vector<std::vector<IfcVector2>> GetContoursInPlane(const std::shared_ptr<TempMesh>& mesh,IfcMatrix3 planeSpace,
IfcVector3 planeNor,IfcFloat planeOffset,
IfcVector3 extrusionDir,IfcVector3& wall_extrusion,bool& first) {
if(mesh->mVertcnt.size() == 1)
{
bool ok;
auto contour = GetContourInPlane2D(mesh,planeSpace,planeNor,planeOffset,extrusionDir,wall_extrusion,first,ok);
if(ok)
return std::vector<std::vector<IfcVector2>> {std::move(contour)};
else
return std::vector<std::vector<IfcVector2>> {};
}
else
{
return GetContoursInPlane3D(mesh,planeSpace,planeOffset);
}
}
// ------------------------------------------------------------------------------------------------
bool TryAddOpenings_Poly2Tri(const std::vector<TempOpening>& openings,
TempMesh& curmesh)
{
IFCImporter::LogWarn("forced to use poly2tri fallback method to generate wall openings");
std::vector<IfcVector3>& out = curmesh.mVerts;
bool result = false;
// Try to derive a solid base plane within the current surface for use as
// working coordinate system.
bool ok;
IfcVector3 nor;
const IfcMatrix3 m = DerivePlaneCoordinateSpace(curmesh, ok, nor);
if (!ok) {
return false;
}
const IfcMatrix3 minv = IfcMatrix3(m).Inverse();
IfcFloat coord = -1;
std::vector<IfcVector2> contour_flat;
contour_flat.reserve(out.size());
IfcVector2 vmin, vmax;
MinMaxChooser<IfcVector2>()(vmin, vmax);
// Move all points into the new coordinate system, collecting min/max verts on the way
for(IfcVector3& x : out) {
const IfcVector3 vv = m * x;
// keep Z offset in the plane coordinate system. Ignoring precision issues
// (which are present, of course), this should be the same value for
// all polygon vertices (assuming the polygon is planar).
// XXX this should be guarded, but we somehow need to pick a suitable
// epsilon
// if(coord != -1.0f) {
// assert(std::fabs(coord - vv.z) < 1e-3f);
// }
coord = vv.z;
vmin = std::min(IfcVector2(vv.x, vv.y), vmin);
vmax = std::max(IfcVector2(vv.x, vv.y), vmax);
contour_flat.emplace_back(vv.x,vv.y);
}
// With the current code in DerivePlaneCoordinateSpace,
// vmin,vmax should always be the 0...1 rectangle (+- numeric inaccuracies)
// but here we won't rely on this.
vmax -= vmin;
// If this happens then the projection must have been wrong.
ai_assert(vmax.Length());
ClipperLib::ExPolygons clipped;
ClipperLib::Polygons holes_union;
IfcVector3 wall_extrusion;
bool first = true;
try {
ClipperLib::Clipper clipper_holes;
for(const TempOpening& t : openings) {
auto contours = GetContoursInPlane(t.profileMesh,m,nor,coord,t.extrusionDir,wall_extrusion,first);
for(auto& contour : contours) {
// scale to clipping space
ClipperLib::Polygon hole;
for(IfcVector2& pip : contour) {
pip.x = (pip.x - vmin.x) / vmax.x;
pip.y = (pip.y - vmin.y) / vmax.y;
hole.emplace_back(to_int64(pip.x), to_int64(pip.y));
}
if(!ClipperLib::Orientation(hole)) {
std::reverse(hole.begin(),hole.end());
// assert(ClipperLib::Orientation(hole));
}
/*ClipperLib::Polygons pol_temp(1), pol_temp2(1);
pol_temp[0] = hole;
ClipperLib::OffsetPolygons(pol_temp,pol_temp2,5.0);
hole = pol_temp2[0];*/
clipper_holes.AddPolygon(hole,ClipperLib::ptSubject);
{
std::stringstream msg;
msg << "- added polygon ";
for(auto elem : hole) {
msg << " (" << elem.X << ", " << elem.Y << ")";
}
IFCImporter::LogDebug(msg.str().c_str());
}
}
}
clipper_holes.Execute(ClipperLib::ctUnion,holes_union,
ClipperLib::pftNonZero,
ClipperLib::pftNonZero);
if (holes_union.empty()) {
return false;
}
// Now that we have the big union of all holes, subtract it from the outer contour
// to obtain the final polygon to feed into the triangulator.
{
ClipperLib::Polygon poly;
for(IfcVector2& pip : contour_flat) {
pip.x = (pip.x - vmin.x) / vmax.x;
pip.y = (pip.y - vmin.y) / vmax.y;
poly.emplace_back(to_int64(pip.x), to_int64(pip.y));
}
if (ClipperLib::Orientation(poly)) {
std::reverse(poly.begin(), poly.end());
}
clipper_holes.Clear();
clipper_holes.AddPolygon(poly,ClipperLib::ptSubject);
clipper_holes.AddPolygons(holes_union,ClipperLib::ptClip);
clipper_holes.Execute(ClipperLib::ctDifference,clipped,
ClipperLib::pftNonZero,
ClipperLib::pftNonZero);
}
}
catch (const char* sx) {
IFCImporter::LogError("Ifc: error during polygon clipping, skipping openings for this face: (Clipper: "
+ std::string(sx) + ")");
return false;
}
std::vector<IfcVector3> old_verts;
std::vector<unsigned int> old_vertcnt;
old_verts.swap(curmesh.mVerts);
old_vertcnt.swap(curmesh.mVertcnt);
std::vector< std::vector<p2t::Point*> > contours;
for(ClipperLib::ExPolygon& clip : clipped) {
contours.clear();
// Build the outer polygon contour line for feeding into poly2tri
std::vector<p2t::Point*> contour_points;
for(ClipperLib::IntPoint& point : clip.outer) {
contour_points.push_back( new p2t::Point(from_int64(point.X), from_int64(point.Y)) );
}
p2t::CDT* cdt ;
try {
// Note: this relies on custom modifications in poly2tri to raise runtime_error's
// instead if assertions. These failures are not debug only, they can actually
// happen in production use if the input data is broken. An assertion would be
// inappropriate.
cdt = new p2t::CDT(contour_points);
}
catch(const std::exception& e) {
IFCImporter::LogError("Ifc: error during polygon triangulation, skipping some openings: (poly2tri: "
+ std::string(e.what()) + ")");
continue;
}
// Build the poly2tri inner contours for all holes we got from ClipperLib
for(ClipperLib::Polygon& opening : clip.holes) {
contours.emplace_back();
std::vector<p2t::Point*>& contour = contours.back();
for(ClipperLib::IntPoint& point : opening) {
contour.push_back( new p2t::Point(from_int64(point.X), from_int64(point.Y)) );
}
cdt->AddHole(contour);
}
try {
// Note: See above
cdt->Triangulate();
}
catch(const std::exception& e) {
IFCImporter::LogError("Ifc: error during polygon triangulation, skipping some openings: (poly2tri: "
+ std::string(e.what()) + ")");
continue;
}
const std::vector<p2t::Triangle*> tris = cdt->GetTriangles();
// Collect the triangles we just produced
for(p2t::Triangle* tri : tris) {
for(int i = 0; i < 3; ++i) {
const IfcVector2 v = IfcVector2(
static_cast<IfcFloat>( tri->GetPoint(i)->x ),
static_cast<IfcFloat>( tri->GetPoint(i)->y )
);
ai_assert(v.x <= 1.0 && v.x >= 0.0 && v.y <= 1.0 && v.y >= 0.0);
const IfcVector3 v3 = minv * IfcVector3(vmin.x + v.x * vmax.x, vmin.y + v.y * vmax.y,coord) ;
curmesh.mVerts.push_back(v3);
}
curmesh.mVertcnt.push_back(3);
}
result = true;
}
if (!result) {
// revert -- it's a shame, but better than nothing
curmesh.mVerts.insert(curmesh.mVerts.end(),old_verts.begin(), old_verts.end());
curmesh.mVertcnt.insert(curmesh.mVertcnt.end(),old_vertcnt.begin(), old_vertcnt.end());
IFCImporter::LogError("Ifc: revert, could not generate openings for this wall");
}
return result;
}
} // ! IFC
} // ! Assimp
#undef to_int64
#undef from_int64
#undef one_vec
#endif