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Diffstat (limited to 'src/3rdparty/assimp/code/IFCBoolean.cpp')
| -rw-r--r-- | src/3rdparty/assimp/code/IFCBoolean.cpp | 1347 |
1 files changed, 725 insertions, 622 deletions
diff --git a/src/3rdparty/assimp/code/IFCBoolean.cpp b/src/3rdparty/assimp/code/IFCBoolean.cpp index 3581d2a9e..042515311 100644 --- a/src/3rdparty/assimp/code/IFCBoolean.cpp +++ b/src/3rdparty/assimp/code/IFCBoolean.cpp @@ -5,8 +5,8 @@ Open Asset Import Library (assimp) Copyright (c) 2006-2010, assimp team All rights reserved. -Redistribution and use of this software in source and binary forms, -with or without modification, are permitted provided that the +Redistribution and use of this software in source and binary forms, +with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above @@ -23,16 +23,16 @@ following conditions are met: derived from this software without specific prior written permission of the assimp team. -THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR -A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, -SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, -DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY -THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. ---------------------------------------------------------------------- @@ -42,219 +42,314 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * @brief Implements a subset of Ifc boolean operations */ -#include "AssimpPCH.h" #ifndef ASSIMP_BUILD_NO_IFC_IMPORTER #include "IFCUtil.h" #include "PolyTools.h" #include "ProcessHelper.h" +#include "Defines.h" #include <iterator> +#include <tuple> + namespace Assimp { - namespace IFC { - -// ------------------------------------------------------------------------------------------------ -enum Intersect { - Intersect_No, - Intersect_LiesOnPlane, - Intersect_Yes -}; + namespace IFC { // ------------------------------------------------------------------------------------------------ -Intersect IntersectSegmentPlane(const IfcVector3& p,const IfcVector3& n, const IfcVector3& e0, - const IfcVector3& e1, - IfcVector3& out) +// Calculates intersection between line segment and plane. To catch corner cases, specify which side you prefer. +// The function then generates a hit only if the end is beyond a certain margin in that direction, filtering out +// "very close to plane" ghost hits as long as start and end stay directly on or within the given plane side. +bool IntersectSegmentPlane(const IfcVector3& p,const IfcVector3& n, const IfcVector3& e0, + const IfcVector3& e1, bool assumeStartOnWhiteSide, IfcVector3& out) { - const IfcVector3 pdelta = e0 - p, seg = e1-e0; - const IfcFloat dotOne = n*seg, dotTwo = -(n*pdelta); - - if (std::fabs(dotOne) < 1e-6) { - return std::fabs(dotTwo) < 1e-6f ? Intersect_LiesOnPlane : Intersect_No; - } - - const IfcFloat t = dotTwo/dotOne; - // t must be in [0..1] if the intersection point is within the given segment - if (t > 1.f || t < 0.f) { - return Intersect_No; - } - out = e0+t*seg; - return Intersect_Yes; + const IfcVector3 pdelta = e0 - p, seg = e1 - e0; + const IfcFloat dotOne = n*seg, dotTwo = -(n*pdelta); + + // if segment ends on plane, do not report a hit. We stay on that side until a following segment starting at this + // point leaves the plane through the other side + if( std::abs(dotOne + dotTwo) < 1e-6 ) + return false; + + // if segment starts on the plane, report a hit only if the end lies on the *other* side + if( std::abs(dotTwo) < 1e-6 ) + { + if( (assumeStartOnWhiteSide && dotOne + dotTwo < 1e-6) || (!assumeStartOnWhiteSide && dotOne + dotTwo > -1e-6) ) + { + out = e0; + return true; + } + else + { + return false; + } + } + + // ignore if segment is parallel to plane and far away from it on either side + // Warning: if there's a few thousand of such segments which slowly accumulate beyond the epsilon, no hit would be registered + if( std::abs(dotOne) < 1e-6 ) + return false; + + // t must be in [0..1] if the intersection point is within the given segment + const IfcFloat t = dotTwo / dotOne; + if( t > 1.0 || t < 0.0 ) + return false; + + out = e0 + t*seg; + return true; } // ------------------------------------------------------------------------------------------------ -void ProcessBooleanHalfSpaceDifference(const IfcHalfSpaceSolid* hs, TempMesh& result, - const TempMesh& first_operand, - ConversionData& conv) +void FilterPolygon(std::vector<IfcVector3>& resultpoly) { - ai_assert(hs != NULL); - - const IfcPlane* const plane = hs->BaseSurface->ToPtr<IfcPlane>(); - if(!plane) { - IFCImporter::LogError("expected IfcPlane as base surface for the IfcHalfSpaceSolid"); - return; - } - - // extract plane base position vector and normal vector - IfcVector3 p,n(0.f,0.f,1.f); - if (plane->Position->Axis) { - ConvertDirection(n,plane->Position->Axis.Get()); - } - ConvertCartesianPoint(p,plane->Position->Location); - - if(!IsTrue(hs->AgreementFlag)) { - n *= -1.f; - } - - // clip the current contents of `meshout` against the plane we obtained from the second operand - const std::vector<IfcVector3>& in = first_operand.verts; - std::vector<IfcVector3>& outvert = result.verts; - - std::vector<unsigned int>::const_iterator begin = first_operand.vertcnt.begin(), - end = first_operand.vertcnt.end(), iit; - - outvert.reserve(in.size()); - result.vertcnt.reserve(first_operand.vertcnt.size()); - - unsigned int vidx = 0; - for(iit = begin; iit != end; vidx += *iit++) { - - unsigned int newcount = 0; - for(unsigned int i = 0; i < *iit; ++i) { - const IfcVector3& e0 = in[vidx+i], e1 = in[vidx+(i+1)%*iit]; - - // does the next segment intersect the plane? - IfcVector3 isectpos; - const Intersect isect = IntersectSegmentPlane(p,n,e0,e1,isectpos); - if (isect == Intersect_No || isect == Intersect_LiesOnPlane) { - if ( (e0-p).Normalize()*n > 0 ) { - outvert.push_back(e0); - ++newcount; - } - } - else if (isect == Intersect_Yes) { - if ( (e0-p).Normalize()*n > 0 ) { - // e0 is on the right side, so keep it - outvert.push_back(e0); - outvert.push_back(isectpos); - newcount += 2; - } - else { - // e0 is on the wrong side, so drop it and keep e1 instead - outvert.push_back(isectpos); - ++newcount; - } - } - } - - if (!newcount) { - continue; - } - - IfcVector3 vmin,vmax; - ArrayBounds(&*(outvert.end()-newcount),newcount,vmin,vmax); - - // filter our IfcFloat points - those may happen if a point lies - // directly on the intersection line. However, due to IfcFloat - // precision a bitwise comparison is not feasible to detect - // this case. - const IfcFloat epsilon = (vmax-vmin).SquareLength() / 1e6f; - FuzzyVectorCompare fz(epsilon); - - std::vector<IfcVector3>::iterator e = std::unique( outvert.end()-newcount, outvert.end(), fz ); - - if (e != outvert.end()) { - newcount -= static_cast<unsigned int>(std::distance(e,outvert.end())); - outvert.erase(e,outvert.end()); - } - if (fz(*( outvert.end()-newcount),outvert.back())) { - outvert.pop_back(); - --newcount; - } - if(newcount > 2) { - result.vertcnt.push_back(newcount); - } - else while(newcount-->0) { - result.verts.pop_back(); - } - - } - IFCImporter::LogDebug("generating CSG geometry by plane clipping (IfcBooleanClippingResult)"); + if( resultpoly.size() < 3 ) + { + resultpoly.clear(); + return; + } + + IfcVector3 vmin, vmax; + ArrayBounds(resultpoly.data(), resultpoly.size(), vmin, vmax); + + // filter our IfcFloat points - those may happen if a point lies + // directly on the intersection line or directly on the clipping plane + const IfcFloat epsilon = (vmax - vmin).SquareLength() / 1e6f; + FuzzyVectorCompare fz(epsilon); + std::vector<IfcVector3>::iterator e = std::unique(resultpoly.begin(), resultpoly.end(), fz); + + if( e != resultpoly.end() ) + resultpoly.erase(e, resultpoly.end()); + + if( !resultpoly.empty() && fz(resultpoly.front(), resultpoly.back()) ) + resultpoly.pop_back(); } // ------------------------------------------------------------------------------------------------ -// Check if e0-e1 intersects a sub-segment of the given boundary line. -// note: this functions works on 3D vectors, but performs its intersection checks solely in xy. -bool IntersectsBoundaryProfile( const IfcVector3& e0, const IfcVector3& e1, const std::vector<IfcVector3>& boundary, - std::vector<size_t>& intersected_boundary_segments, - std::vector<IfcVector3>& intersected_boundary_points, - bool half_open = false, - bool* e0_hits_border = NULL) +void WritePolygon(std::vector<IfcVector3>& resultpoly, TempMesh& result) { - ai_assert(intersected_boundary_segments.empty()); - ai_assert(intersected_boundary_points.empty()); - - if(e0_hits_border) { - *e0_hits_border = false; - } - - const IfcVector3& e = e1 - e0; - - for (size_t i = 0, bcount = boundary.size(); i < bcount; ++i) { - // boundary segment i: b0-b1 - const IfcVector3& b0 = boundary[i]; - const IfcVector3& b1 = boundary[(i+1) % bcount]; + FilterPolygon(resultpoly); - const IfcVector3& b = b1 - b0; - - // segment-segment intersection - // solve b0 + b*s = e0 + e*t for (s,t) - const IfcFloat det = (-b.x * e.y + e.x * b.y); - if(std::fabs(det) < 1e-6) { - // no solutions (parallel lines) - continue; - } + if( resultpoly.size() > 2 ) + { + result.verts.insert(result.verts.end(), resultpoly.begin(), resultpoly.end()); + result.vertcnt.push_back(resultpoly.size()); + } +} - const IfcFloat x = b0.x - e0.x; - const IfcFloat y = b0.y - e0.y; - const IfcFloat s = (x*e.y - e.x*y)/det; - const IfcFloat t = (x*b.y - b.x*y)/det; +// ------------------------------------------------------------------------------------------------ +void ProcessBooleanHalfSpaceDifference(const IfcHalfSpaceSolid* hs, TempMesh& result, + const TempMesh& first_operand, + ConversionData& /*conv*/) +{ + ai_assert(hs != NULL); + + const IfcPlane* const plane = hs->BaseSurface->ToPtr<IfcPlane>(); + if(!plane) { + IFCImporter::LogError("expected IfcPlane as base surface for the IfcHalfSpaceSolid"); + return; + } + + // extract plane base position vector and normal vector + IfcVector3 p,n(0.f,0.f,1.f); + if (plane->Position->Axis) { + ConvertDirection(n,plane->Position->Axis.Get()); + } + ConvertCartesianPoint(p,plane->Position->Location); + + if(!IsTrue(hs->AgreementFlag)) { + n *= -1.f; + } + + // clip the current contents of `meshout` against the plane we obtained from the second operand + const std::vector<IfcVector3>& in = first_operand.verts; + std::vector<IfcVector3>& outvert = result.verts; + + std::vector<unsigned int>::const_iterator begin = first_operand.vertcnt.begin(), + end = first_operand.vertcnt.end(), iit; + + outvert.reserve(in.size()); + result.vertcnt.reserve(first_operand.vertcnt.size()); + + unsigned int vidx = 0; + for(iit = begin; iit != end; vidx += *iit++) { + + unsigned int newcount = 0; + bool isAtWhiteSide = (in[vidx] - p) * n > -1e-6; + for( unsigned int i = 0; i < *iit; ++i ) { + const IfcVector3& e0 = in[vidx + i], e1 = in[vidx + (i + 1) % *iit]; + + // does the next segment intersect the plane? + IfcVector3 isectpos; + if( IntersectSegmentPlane(p, n, e0, e1, isAtWhiteSide, isectpos) ) { + if( isAtWhiteSide ) { + // e0 is on the right side, so keep it + outvert.push_back(e0); + outvert.push_back(isectpos); + newcount += 2; + } + else { + // e0 is on the wrong side, so drop it and keep e1 instead + outvert.push_back(isectpos); + ++newcount; + } + isAtWhiteSide = !isAtWhiteSide; + } + else + { + if( isAtWhiteSide ) { + outvert.push_back(e0); + ++newcount; + } + } + } + + if (!newcount) { + continue; + } + + IfcVector3 vmin,vmax; + ArrayBounds(&*(outvert.end()-newcount),newcount,vmin,vmax); + + // filter our IfcFloat points - those may happen if a point lies + // directly on the intersection line. However, due to IfcFloat + // precision a bitwise comparison is not feasible to detect + // this case. + const IfcFloat epsilon = (vmax-vmin).SquareLength() / 1e6f; + FuzzyVectorCompare fz(epsilon); + + std::vector<IfcVector3>::iterator e = std::unique( outvert.end()-newcount, outvert.end(), fz ); + + if (e != outvert.end()) { + newcount -= static_cast<unsigned int>(std::distance(e,outvert.end())); + outvert.erase(e,outvert.end()); + } + if (fz(*( outvert.end()-newcount),outvert.back())) { + outvert.pop_back(); + --newcount; + } + if(newcount > 2) { + result.vertcnt.push_back(newcount); + } + else while(newcount-->0) { + result.verts.pop_back(); + } + + } + IFCImporter::LogDebug("generating CSG geometry by plane clipping (IfcBooleanClippingResult)"); +} +// ------------------------------------------------------------------------------------------------ +// Check if e0-e1 intersects a sub-segment of the given boundary line. +// note: this functions works on 3D vectors, but performs its intersection checks solely in xy. +// New version takes the supposed inside/outside state as a parameter and treats corner cases as if +// the line stays on that side. This should make corner cases more stable. +// Two million assumptions! Boundary should have all z at 0.0, will be treated as closed, should not have +// segments with length <1e-6, self-intersecting might break the corner case handling... just don't go there, ok? +bool IntersectsBoundaryProfile(const IfcVector3& e0, const IfcVector3& e1, const std::vector<IfcVector3>& boundary, + const bool isStartAssumedInside, std::vector<std::pair<size_t, IfcVector3> >& intersect_results, + const bool halfOpen = false) +{ + ai_assert(intersect_results.empty()); + + // determine winding order - necessary to detect segments going "inwards" or "outwards" from a point directly on the border + // positive sum of angles means clockwise order when looking down the -Z axis + IfcFloat windingOrder = 0.0; + for( size_t i = 0, bcount = boundary.size(); i < bcount; ++i ) { + IfcVector3 b01 = boundary[(i + 1) % bcount] - boundary[i]; + IfcVector3 b12 = boundary[(i + 2) % bcount] - boundary[(i + 1) % bcount]; + IfcVector3 b1_side = IfcVector3(b01.y, -b01.x, 0.0); // rotated 90° clockwise in Z plane + // Warning: rough estimate only. A concave poly with lots of small segments each featuring a small counter rotation + // could fool the accumulation. Correct implementation would be sum( acos( b01 * b2) * sign( b12 * b1_side)) + windingOrder += (b1_side.x*b12.x + b1_side.y*b12.y); + } + windingOrder = windingOrder > 0.0 ? 1.0 : -1.0; + + const IfcVector3 e = e1 - e0; + + for( size_t i = 0, bcount = boundary.size(); i < bcount; ++i ) { + // boundary segment i: b0-b1 + const IfcVector3& b0 = boundary[i]; + const IfcVector3& b1 = boundary[(i + 1) % bcount]; + IfcVector3 b = b1 - b0; + IfcFloat b_sqlen_inv = 1.0 / b.SquareLength(); + + // segment-segment intersection + // solve b0 + b*s = e0 + e*t for (s,t) + const IfcFloat det = (-b.x * e.y + e.x * b.y); + if( std::abs(det) < 1e-6 ) { + // no solutions (parallel lines) + continue; + } + + const IfcFloat x = b0.x - e0.x; + const IfcFloat y = b0.y - e0.y; + const IfcFloat s = (x*e.y - e.x*y) / det; // scale along boundary edge + const IfcFloat t = (x*b.y - b.x*y) / det; // scale along given segment + const IfcVector3 p = e0 + e*t; #ifdef ASSIMP_BUILD_DEBUG - const IfcVector3 check = b0 + b*s - (e0 + e*t); - ai_assert((IfcVector2(check.x,check.y)).SquareLength() < 1e-5); + const IfcVector3 check = b0 + b*s - p; + ai_assert((IfcVector2(check.x, check.y)).SquareLength() < 1e-5); #endif - // for a valid intersection, s-t should be in range [0,1]. - // note that for t (i.e. the segment point) we only use a - // half-sided epsilon because the next segment should catch - // this case. - const IfcFloat epsilon = 1e-6; - if (t >= -epsilon && (t <= 1.0+epsilon || half_open) && s >= -epsilon && s <= 1.0) { - - if (e0_hits_border && !*e0_hits_border) { - *e0_hits_border = std::fabs(t) < 1e-5f; - } - - const IfcVector3& p = e0 + e*t; - - // only insert the point into the list if it is sufficiently - // far away from the previous intersection point. This way, - // we avoid duplicate detection if the intersection is - // directly on the vertex between two segments. - if (!intersected_boundary_points.empty() && intersected_boundary_segments.back()==i-1 ) { - const IfcVector3 diff = intersected_boundary_points.back() - p; - if(IfcVector2(diff.x, diff.y).SquareLength() < 1e-7) { - continue; - } - } - intersected_boundary_segments.push_back(i); - intersected_boundary_points.push_back(p); - } - } - - return !intersected_boundary_segments.empty(); + // also calculate the distance of e0 and e1 to the segment. We need to detect the "starts directly on segment" + // and "ends directly at segment" cases + bool startsAtSegment, endsAtSegment; + { + // calculate closest point to each end on the segment, clamp that point to the segment's length, then check + // distance to that point. This approach is like testing if e0 is inside a capped cylinder. + IfcFloat et0 = (b.x*(e0.x - b0.x) + b.y*(e0.y - b0.y)) * b_sqlen_inv; + IfcVector3 closestPosToE0OnBoundary = b0 + std::max(IfcFloat(0.0), std::min(IfcFloat(1.0), et0)) * b; + startsAtSegment = (closestPosToE0OnBoundary - IfcVector3(e0.x, e0.y, 0.0)).SquareLength() < 1e-12; + IfcFloat et1 = (b.x*(e1.x - b0.x) + b.y*(e1.y - b0.y)) * b_sqlen_inv; + IfcVector3 closestPosToE1OnBoundary = b0 + std::max(IfcFloat(0.0), std::min(IfcFloat(1.0), et1)) * b; + endsAtSegment = (closestPosToE1OnBoundary - IfcVector3(e1.x, e1.y, 0.0)).SquareLength() < 1e-12; + } + + // Line segment ends at boundary -> ignore any hit, it will be handled by possibly following segments + if( endsAtSegment && !halfOpen ) + continue; + + // Line segment starts at boundary -> generate a hit only if following that line would change the INSIDE/OUTSIDE + // state. This should catch the case where a connected set of segments has a point directly on the boundary, + // one segment not hitting it because it ends there and the next segment not hitting it because it starts there + // Should NOT generate a hit if the segment only touches the boundary but turns around and stays inside. + if( startsAtSegment ) + { + IfcVector3 inside_dir = IfcVector3(b.y, -b.x, 0.0) * windingOrder; + bool isGoingInside = (inside_dir * e) > 0.0; + if( isGoingInside == isStartAssumedInside ) + continue; + + // only insert the point into the list if it is sufficiently far away from the previous intersection point. + // This way, we avoid duplicate detection if the intersection is directly on the vertex between two segments. + if( !intersect_results.empty() && intersect_results.back().first == i - 1 ) + { + const IfcVector3 diff = intersect_results.back().second - e0; + if( IfcVector2(diff.x, diff.y).SquareLength() < 1e-10 ) + continue; + } + intersect_results.push_back(std::make_pair(i, e0)); + continue; + } + + // for a valid intersection, s and t should be in range [0,1]. Including a bit of epsilon on s, potential double + // hits on two consecutive boundary segments are filtered + if( s >= -1e-6 * b_sqlen_inv && s <= 1.0 + 1e-6*b_sqlen_inv && t >= 0.0 && (t <= 1.0 || halfOpen) ) + { + // only insert the point into the list if it is sufficiently far away from the previous intersection point. + // This way, we avoid duplicate detection if the intersection is directly on the vertex between two segments. + if( !intersect_results.empty() && intersect_results.back().first == i - 1 ) + { + const IfcVector3 diff = intersect_results.back().second - p; + if( IfcVector2(diff.x, diff.y).SquareLength() < 1e-10 ) + continue; + } + intersect_results.push_back(std::make_pair(i, p)); + } + } + + return !intersect_results.empty(); } @@ -262,468 +357,476 @@ bool IntersectsBoundaryProfile( const IfcVector3& e0, const IfcVector3& e1, cons // note: this functions works on 3D vectors, but performs its intersection checks solely in xy. bool PointInPoly(const IfcVector3& p, const std::vector<IfcVector3>& boundary) { - // even-odd algorithm: take a random vector that extends from p to infinite - // and counts how many times it intersects edges of the boundary. - // because checking for segment intersections is prone to numeric inaccuracies - // or double detections (i.e. when hitting multiple adjacent segments at their - // shared vertices) we do it thrice with different rays and vote on it. - - // the even-odd algorithm doesn't work for points which lie directly on - // the border of the polygon. If any of our attempts produces this result, - // we return false immediately. - - std::vector<size_t> intersected_boundary_segments; - std::vector<IfcVector3> intersected_boundary_points; - size_t votes = 0; - - bool is_border; - IntersectsBoundaryProfile(p, p + IfcVector3(1.0,0,0), boundary, - intersected_boundary_segments, - intersected_boundary_points, true, &is_border); - - if(is_border) { - return false; - } - - votes += intersected_boundary_segments.size() % 2; + // even-odd algorithm: take a random vector that extends from p to infinite + // and counts how many times it intersects edges of the boundary. + // because checking for segment intersections is prone to numeric inaccuracies + // or double detections (i.e. when hitting multiple adjacent segments at their + // shared vertices) we do it thrice with different rays and vote on it. - intersected_boundary_segments.clear(); - intersected_boundary_points.clear(); + // the even-odd algorithm doesn't work for points which lie directly on + // the border of the polygon. If any of our attempts produces this result, + // we return false immediately. - IntersectsBoundaryProfile(p, p + IfcVector3(0,1.0,0), boundary, - intersected_boundary_segments, - intersected_boundary_points, true, &is_border); + std::vector<std::pair<size_t, IfcVector3> > intersected_boundary; + size_t votes = 0; - if(is_border) { - return false; - } + IntersectsBoundaryProfile(p, p + IfcVector3(1.0, 0, 0), boundary, true, intersected_boundary, true); + votes += intersected_boundary.size() % 2; - votes += intersected_boundary_segments.size() % 2; + intersected_boundary.clear(); + IntersectsBoundaryProfile(p, p + IfcVector3(0, 1.0, 0), boundary, true, intersected_boundary, true); + votes += intersected_boundary.size() % 2; - intersected_boundary_segments.clear(); - intersected_boundary_points.clear(); + intersected_boundary.clear(); + IntersectsBoundaryProfile(p, p + IfcVector3(0.6, -0.6, 0.0), boundary, true, intersected_boundary, true); + votes += intersected_boundary.size() % 2; - IntersectsBoundaryProfile(p, p + IfcVector3(0.6,-0.6,0.0), boundary, - intersected_boundary_segments, - intersected_boundary_points, true, &is_border); - - if(is_border) { - return false; - } - - votes += intersected_boundary_segments.size() % 2; - //ai_assert(votes == 3 || votes == 0); - return votes > 1; +// ai_assert(votes == 3 || votes == 0); + return votes > 1; } // ------------------------------------------------------------------------------------------------ -void ProcessPolygonalBoundedBooleanHalfSpaceDifference(const IfcPolygonalBoundedHalfSpace* hs, TempMesh& result, - const TempMesh& first_operand, - ConversionData& conv) +void ProcessPolygonalBoundedBooleanHalfSpaceDifference(const IfcPolygonalBoundedHalfSpace* hs, TempMesh& result, + const TempMesh& first_operand, + ConversionData& conv) { - ai_assert(hs != NULL); - - const IfcPlane* const plane = hs->BaseSurface->ToPtr<IfcPlane>(); - if(!plane) { - IFCImporter::LogError("expected IfcPlane as base surface for the IfcHalfSpaceSolid"); - return; - } - - // extract plane base position vector and normal vector - IfcVector3 p,n(0.f,0.f,1.f); - if (plane->Position->Axis) { - ConvertDirection(n,plane->Position->Axis.Get()); - } - ConvertCartesianPoint(p,plane->Position->Location); - - if(!IsTrue(hs->AgreementFlag)) { - n *= -1.f; - } - - n.Normalize(); - - // obtain the polygonal bounding volume - boost::shared_ptr<TempMesh> profile = boost::shared_ptr<TempMesh>(new TempMesh()); - if(!ProcessCurve(hs->PolygonalBoundary, *profile.get(), conv)) { - IFCImporter::LogError("expected valid polyline for boundary of boolean halfspace"); - return; - } - - IfcMatrix4 proj_inv; - ConvertAxisPlacement(proj_inv,hs->Position); - - // and map everything into a plane coordinate space so all intersection - // tests can be done in 2D space. - IfcMatrix4 proj = proj_inv; - proj.Inverse(); - - // clip the current contents of `meshout` against the plane we obtained from the second operand - const std::vector<IfcVector3>& in = first_operand.verts; - std::vector<IfcVector3>& outvert = result.verts; - - std::vector<unsigned int>::const_iterator begin = first_operand.vertcnt.begin(), - end = first_operand.vertcnt.end(), iit; - - outvert.reserve(in.size()); - result.vertcnt.reserve(first_operand.vertcnt.size()); - - std::vector<size_t> intersected_boundary_segments; - std::vector<IfcVector3> intersected_boundary_points; - - // TODO: the following algorithm doesn't handle all cases. - unsigned int vidx = 0; - for(iit = begin; iit != end; vidx += *iit++) { - if (!*iit) { - continue; - } - - unsigned int newcount = 0; - bool was_outside_boundary = !PointInPoly(proj * in[vidx], profile->verts); - - // used any more? - //size_t last_intersected_boundary_segment; - IfcVector3 last_intersected_boundary_point; - - bool extra_point_flag = false; - IfcVector3 extra_point; - - IfcVector3 enter_volume; - bool entered_volume_flag = false; - - for(unsigned int i = 0; i < *iit; ++i) { - // current segment: [i,i+1 mod size] or [*extra_point,i] if extra_point_flag is set - const IfcVector3& e0 = extra_point_flag ? extra_point : in[vidx+i]; - const IfcVector3& e1 = extra_point_flag ? in[vidx+i] : in[vidx+(i+1)%*iit]; - - // does the current segment intersect the polygonal boundary? - const IfcVector3& e0_plane = proj * e0; - const IfcVector3& e1_plane = proj * e1; - - intersected_boundary_segments.clear(); - intersected_boundary_points.clear(); - - const bool is_outside_boundary = !PointInPoly(e1_plane, profile->verts); - const bool is_boundary_intersection = is_outside_boundary != was_outside_boundary; - - IntersectsBoundaryProfile(e0_plane, e1_plane, profile->verts, - intersected_boundary_segments, - intersected_boundary_points); - - ai_assert(!is_boundary_intersection || !intersected_boundary_segments.empty()); - - // does the current segment intersect the plane? - // (no extra check if this is an extra point) - IfcVector3 isectpos; - const Intersect isect = extra_point_flag ? Intersect_No : IntersectSegmentPlane(p,n,e0,e1,isectpos); - -#ifdef ASSIMP_BUILD_DEBUG - if (isect == Intersect_Yes) { - const IfcFloat f = std::fabs((isectpos - p)*n); - ai_assert(f < 1e-5); - } -#endif - - const bool is_white_side = (e0-p)*n >= -1e-6; - - // e0 on good side of plane? (i.e. we should keep all geometry on this side) - if (is_white_side) { - // but is there an intersection in e0-e1 and is e1 in the clipping - // boundary? In this case, generate a line that only goes to the - // intersection point. - if (isect == Intersect_Yes && !is_outside_boundary) { - outvert.push_back(e0); - ++newcount; - - outvert.push_back(isectpos); - ++newcount; - - /* - // this is, however, only a line that goes to the plane, but not - // necessarily to the point where the bounding volume on the - // black side of the plane is hit. So basically, we need another - // check for [isectpos-e1], which should yield an intersection - // point. - extra_point_flag = true; - extra_point = isectpos; - - was_outside_boundary = true; - continue; */ - - // [isectpos, enter_volume] potentially needs extra points. - // For this, we determine the intersection point with the - // bounding volume and project it onto the plane. - /* - const IfcVector3& enter_volume_proj = proj * enter_volume; - const IfcVector3& enter_isectpos = proj * isectpos; - - intersected_boundary_segments.clear(); - intersected_boundary_points.clear(); - - IntersectsBoundaryProfile(enter_volume_proj, enter_isectpos, profile->verts, - intersected_boundary_segments, - intersected_boundary_points); - - if(!intersected_boundary_segments.empty()) { - - vec = vec + ((p - vec) * n) * n; - } - */ - - //entered_volume_flag = true; - } - else { - outvert.push_back(e0); - ++newcount; - } - } - // e0 on bad side of plane, e1 on good (i.e. we should remove geometry on this side, - // but only if it is within the bounding volume). - else if (isect == Intersect_Yes) { - // is e0 within the clipping volume? Insert the intersection point - // of [e0,e1] and the plane instead of e0. - if(was_outside_boundary) { - outvert.push_back(e0); - } - else { - if(entered_volume_flag) { - const IfcVector3& fix_point = enter_volume + ((p - enter_volume) * n) * n; - outvert.push_back(fix_point); - ++newcount; - } - - outvert.push_back(isectpos); - } - entered_volume_flag = false; - ++newcount; - } - else { // no intersection with plane or parallel; e0,e1 are on the bad side - - // did we just pass the boundary line to the poly bounding? - if (is_boundary_intersection) { - - // and are now outside the clipping boundary? - if (is_outside_boundary) { - // in this case, get the point where the clipping boundary - // was entered first. Then, get the point where the clipping - // boundary volume was left! These two points with the plane - // normal form another plane that intersects the clipping - // volume. There are two ways to get from the first to the - // second point along the intersection curve, try to pick the - // one that lies within the current polygon. - - // TODO this approach doesn't handle all cases - - // ... - - IfcFloat d = 1e20; - IfcVector3 vclosest; - BOOST_FOREACH(const IfcVector3& v, intersected_boundary_points) { - const IfcFloat dn = (v-e1_plane).SquareLength(); - if (dn < d) { - d = dn; - vclosest = v; - } - } - - vclosest = proj_inv * vclosest; - if(entered_volume_flag) { - const IfcVector3& fix_point = vclosest + ((p - vclosest) * n) * n; - outvert.push_back(fix_point); - ++newcount; - - entered_volume_flag = false; - } - - outvert.push_back(vclosest); - ++newcount; - - //outvert.push_back(e1); - //++newcount; - } - else { - entered_volume_flag = true; - - // we just entered the clipping boundary. Record the point - // and the segment where we entered and also generate this point. - //last_intersected_boundary_segment = intersected_boundary_segments.front(); - //last_intersected_boundary_point = intersected_boundary_points.front(); - - outvert.push_back(e0); - ++newcount; - - IfcFloat d = 1e20; - IfcVector3 vclosest; - BOOST_FOREACH(const IfcVector3& v, intersected_boundary_points) { - const IfcFloat dn = (v-e0_plane).SquareLength(); - if (dn < d) { - d = dn; - vclosest = v; - } - } - - enter_volume = proj_inv * vclosest; - outvert.push_back(enter_volume); - ++newcount; - } - } - // if not, we just keep the vertex - else if (is_outside_boundary) { - outvert.push_back(e0); - ++newcount; - - entered_volume_flag = false; - } - } - - was_outside_boundary = is_outside_boundary; - extra_point_flag = false; - } - - if (!newcount) { - continue; - } - - IfcVector3 vmin,vmax; - ArrayBounds(&*(outvert.end()-newcount),newcount,vmin,vmax); - - // filter our IfcFloat points - those may happen if a point lies - // directly on the intersection line. However, due to IfcFloat - // precision a bitwise comparison is not feasible to detect - // this case. - const IfcFloat epsilon = (vmax-vmin).SquareLength() / 1e6f; - FuzzyVectorCompare fz(epsilon); - - std::vector<IfcVector3>::iterator e = std::unique( outvert.end()-newcount, outvert.end(), fz ); - - if (e != outvert.end()) { - newcount -= static_cast<unsigned int>(std::distance(e,outvert.end())); - outvert.erase(e,outvert.end()); - } - if (fz(*( outvert.end()-newcount),outvert.back())) { - outvert.pop_back(); - --newcount; - } - if(newcount > 2) { - result.vertcnt.push_back(newcount); - } - else while(newcount-->0) { - result.verts.pop_back(); - } - - } - IFCImporter::LogDebug("generating CSG geometry by plane clipping with polygonal bounding (IfcBooleanClippingResult)"); + ai_assert(hs != NULL); + + const IfcPlane* const plane = hs->BaseSurface->ToPtr<IfcPlane>(); + if(!plane) { + IFCImporter::LogError("expected IfcPlane as base surface for the IfcHalfSpaceSolid"); + return; + } + + // extract plane base position vector and normal vector + IfcVector3 p,n(0.f,0.f,1.f); + if (plane->Position->Axis) { + ConvertDirection(n,plane->Position->Axis.Get()); + } + ConvertCartesianPoint(p,plane->Position->Location); + + if(!IsTrue(hs->AgreementFlag)) { + n *= -1.f; + } + + n.Normalize(); + + // obtain the polygonal bounding volume + std::shared_ptr<TempMesh> profile = std::shared_ptr<TempMesh>(new TempMesh()); + if(!ProcessCurve(hs->PolygonalBoundary, *profile.get(), conv)) { + IFCImporter::LogError("expected valid polyline for boundary of boolean halfspace"); + return; + } + + // determine winding order by calculating the normal. + IfcVector3 profileNormal = TempMesh::ComputePolygonNormal(profile->verts.data(), profile->verts.size()); + + IfcMatrix4 proj_inv; + ConvertAxisPlacement(proj_inv,hs->Position); + + // and map everything into a plane coordinate space so all intersection + // tests can be done in 2D space. + IfcMatrix4 proj = proj_inv; + proj.Inverse(); + + // clip the current contents of `meshout` against the plane we obtained from the second operand + const std::vector<IfcVector3>& in = first_operand.verts; + std::vector<IfcVector3>& outvert = result.verts; + std::vector<unsigned int>& outvertcnt = result.vertcnt; + + outvert.reserve(in.size()); + outvertcnt.reserve(first_operand.vertcnt.size()); + + unsigned int vidx = 0; + std::vector<unsigned int>::const_iterator begin = first_operand.vertcnt.begin(); + std::vector<unsigned int>::const_iterator end = first_operand.vertcnt.end(); + std::vector<unsigned int>::const_iterator iit; + for( iit = begin; iit != end; vidx += *iit++ ) + { + // Our new approach: we cut the poly along the plane, then we intersect the part on the black side of the plane + // against the bounding polygon. All the white parts, and the black part outside the boundary polygon, are kept. + std::vector<IfcVector3> whiteside, blackside; + + { + const IfcVector3* srcVertices = &in[vidx]; + const size_t srcVtxCount = *iit; + if( srcVtxCount == 0 ) + continue; + + IfcVector3 polyNormal = TempMesh::ComputePolygonNormal(srcVertices, srcVtxCount, true); + + // if the poly is parallel to the plane, put it completely on the black or white side + if( std::abs(polyNormal * n) > 0.9999 ) + { + bool isOnWhiteSide = (srcVertices[0] - p) * n > -1e-6; + std::vector<IfcVector3>& targetSide = isOnWhiteSide ? whiteside : blackside; + targetSide.insert(targetSide.end(), srcVertices, srcVertices + srcVtxCount); + } + else + { + // otherwise start building one polygon for each side. Whenever the current line segment intersects the plane + // we put a point there as an end of the current segment. Then we switch to the other side, put a point there, too, + // as a beginning of the current segment, and simply continue accumulating vertices. + bool isCurrentlyOnWhiteSide = ((srcVertices[0]) - p) * n > -1e-6; + for( size_t a = 0; a < srcVtxCount; ++a ) + { + IfcVector3 e0 = srcVertices[a]; + IfcVector3 e1 = srcVertices[(a + 1) % srcVtxCount]; + IfcVector3 ei; + + // put starting point to the current mesh + std::vector<IfcVector3>& trgt = isCurrentlyOnWhiteSide ? whiteside : blackside; + trgt.push_back(srcVertices[a]); + + // if there's an intersection, put an end vertex there, switch to the other side's mesh, + // and add a starting vertex there, too + bool isPlaneHit = IntersectSegmentPlane(p, n, e0, e1, isCurrentlyOnWhiteSide, ei); + if( isPlaneHit ) + { + if( trgt.empty() || (trgt.back() - ei).SquareLength() > 1e-12 ) + trgt.push_back(ei); + isCurrentlyOnWhiteSide = !isCurrentlyOnWhiteSide; + std::vector<IfcVector3>& newtrgt = isCurrentlyOnWhiteSide ? whiteside : blackside; + newtrgt.push_back(ei); + } + } + } + } + + // the part on the white side can be written into the target mesh right away + WritePolygon(whiteside, result); + + // The black part is the piece we need to get rid of, but only the part of it within the boundary polygon. + // So we now need to construct all the polygons that result from BlackSidePoly minus BoundaryPoly. + FilterPolygon(blackside); + + // Complicated, II. We run along the polygon. a) When we're inside the boundary, we run on until we hit an + // intersection, which means we're leaving it. We then start a new out poly there. b) When we're outside the + // boundary, we start collecting vertices until we hit an intersection, then we run along the boundary until we hit + // an intersection, then we switch back to the poly and run on on this one again, and so on until we got a closed + // loop. Then we continue with the path we left to catch potential additional polys on the other side of the + // boundary as described in a) + if( !blackside.empty() ) + { + // poly edge index, intersection point, edge index in boundary poly + std::vector<std::tuple<size_t, IfcVector3, size_t> > intersections; + bool startedInside = PointInPoly(proj * blackside.front(), profile->verts); + bool isCurrentlyInside = startedInside; + + std::vector<std::pair<size_t, IfcVector3> > intersected_boundary; + + for( size_t a = 0; a < blackside.size(); ++a ) + { + const IfcVector3 e0 = proj * blackside[a]; + const IfcVector3 e1 = proj * blackside[(a + 1) % blackside.size()]; + + intersected_boundary.clear(); + IntersectsBoundaryProfile(e0, e1, profile->verts, isCurrentlyInside, intersected_boundary); + // sort the hits by distance from e0 to get the correct in/out/in sequence. Manually :-( I miss you, C++11. + if( intersected_boundary.size() > 1 ) + { + bool keepSorting = true; + while( keepSorting ) + { + keepSorting = false; + for( size_t b = 0; b < intersected_boundary.size() - 1; ++b ) + { + if( (intersected_boundary[b + 1].second - e0).SquareLength() < (intersected_boundary[b].second - e0).SquareLength() ) + { + keepSorting = true; + std::swap(intersected_boundary[b + 1], intersected_boundary[b]); + } + } + } + } + // now add them to the list of intersections + for( size_t b = 0; b < intersected_boundary.size(); ++b ) + intersections.push_back(std::make_tuple(a, proj_inv * intersected_boundary[b].second, intersected_boundary[b].first)); + + // and calculate our new inside/outside state + if( intersected_boundary.size() & 1 ) + isCurrentlyInside = !isCurrentlyInside; + } + + // we got a list of in-out-combinations of intersections. That should be an even number of intersections, or + // we're fucked. + if( (intersections.size() & 1) != 0 ) + { + IFCImporter::LogWarn("Odd number of intersections, can't work with that. Omitting half space boundary check."); + continue; + } + + if( intersections.size() > 1 ) + { + // If we started outside, the first intersection is a out->in intersection. Cycle them so that it + // starts with an intersection leaving the boundary + if( !startedInside ) + for( size_t b = 0; b < intersections.size() - 1; ++b ) + std::swap(intersections[b], intersections[(b + intersections.size() - 1) % intersections.size()]); + + // Filter pairs of out->in->out that lie too close to each other. + for( size_t a = 0; intersections.size() > 0 && a < intersections.size() - 1; /**/ ) + { + if( (std::get<1>(intersections[a]) - std::get<1>(intersections[(a + 1) % intersections.size()])).SquareLength() < 1e-10 ) + intersections.erase(intersections.begin() + a, intersections.begin() + a + 2); + else + a++; + } + if( intersections.size() > 1 && (std::get<1>(intersections.back()) - std::get<1>(intersections.front())).SquareLength() < 1e-10 ) + { + intersections.pop_back(); intersections.erase(intersections.begin()); + } + } + + + // no intersections at all: either completely inside the boundary, so everything gets discarded, or completely outside. + // in the latter case we're implementional lost. I'm simply going to ignore this, so a large poly will not get any + // holes if the boundary is smaller and does not touch it anywhere. + if( intersections.empty() ) + { + // starting point was outside -> everything is outside the boundary -> nothing is clipped -> add black side + // to result mesh unchanged + if( !startedInside ) + { + outvertcnt.push_back(blackside.size()); + outvert.insert(outvert.end(), blackside.begin(), blackside.end()); + continue; + } + else + { + // starting point was inside the boundary -> everything is inside the boundary -> nothing is spared from the + // clipping -> nothing left to add to the result mesh + continue; + } + } + + // determine the direction in which we're marching along the boundary polygon. If the src poly is faced upwards + // and the boundary is also winded this way, we need to march *backwards* on the boundary. + const IfcVector3 polyNormal = IfcMatrix3(proj) * TempMesh::ComputePolygonNormal(blackside.data(), blackside.size()); + bool marchBackwardsOnBoundary = (profileNormal * polyNormal) >= 0.0; + + // Build closed loops from these intersections. Starting from an intersection leaving the boundary we + // walk along the polygon to the next intersection (which should be an IS entering the boundary poly). + // From there we walk along the boundary until we hit another intersection leaving the boundary, + // walk along the poly to the next IS and so on until we're back at the starting point. + // We remove every intersection we "used up", so any remaining intersection is the start of a new loop. + while( !intersections.empty() ) + { + std::vector<IfcVector3> resultpoly; + size_t currentIntersecIdx = 0; + + while( true ) + { + ai_assert(intersections.size() > currentIntersecIdx + 1); + std::tuple<size_t, IfcVector3, size_t> currintsec = intersections[currentIntersecIdx + 0]; + std::tuple<size_t, IfcVector3, size_t> nextintsec = intersections[currentIntersecIdx + 1]; + intersections.erase(intersections.begin() + currentIntersecIdx, intersections.begin() + currentIntersecIdx + 2); + + // we start with an in->out intersection + resultpoly.push_back(std::get<1>(currintsec)); + // climb along the polygon to the next intersection, which should be an out->in + size_t numPolyPoints = (std::get<0>(currintsec) > std::get<0>(nextintsec) ? blackside.size() : 0) + + std::get<0>(nextintsec) - std::get<0>(currintsec); + for( size_t a = 1; a <= numPolyPoints; ++a ) + resultpoly.push_back(blackside[(std::get<0>(currintsec) + a) % blackside.size()]); + // put the out->in intersection + resultpoly.push_back(std::get<1>(nextintsec)); + + // generate segments along the boundary polygon that lie in the poly's plane until we hit another intersection + IfcVector3 startingPoint = proj * std::get<1>(nextintsec); + size_t currentBoundaryEdgeIdx = (std::get<2>(nextintsec) + (marchBackwardsOnBoundary ? 1 : 0)) % profile->verts.size(); + size_t nextIntsecIdx = SIZE_MAX; + while( nextIntsecIdx == SIZE_MAX ) + { + IfcFloat t = 1e10; + + size_t nextBoundaryEdgeIdx = marchBackwardsOnBoundary ? (currentBoundaryEdgeIdx + profile->verts.size() - 1) : currentBoundaryEdgeIdx + 1; + nextBoundaryEdgeIdx %= profile->verts.size(); + // vertices of the current boundary segments + IfcVector3 currBoundaryPoint = profile->verts[currentBoundaryEdgeIdx]; + IfcVector3 nextBoundaryPoint = profile->verts[nextBoundaryEdgeIdx]; + // project the two onto the polygon + if( std::abs(polyNormal.z) > 1e-5 ) + { + currBoundaryPoint.z = startingPoint.z + (currBoundaryPoint.x - startingPoint.x) * polyNormal.x/polyNormal.z + (currBoundaryPoint.y - startingPoint.y) * polyNormal.y/polyNormal.z; + nextBoundaryPoint.z = startingPoint.z + (nextBoundaryPoint.x - startingPoint.x) * polyNormal.x/polyNormal.z + (nextBoundaryPoint.y - startingPoint.y) * polyNormal.y/polyNormal.z; + } + + // build a direction that goes along the boundary border but lies in the poly plane + IfcVector3 boundaryPlaneNormal = ((nextBoundaryPoint - currBoundaryPoint) ^ profileNormal).Normalize(); + IfcVector3 dirAtPolyPlane = (boundaryPlaneNormal ^ polyNormal).Normalize() * (marchBackwardsOnBoundary ? -1.0 : 1.0); + // if we can project the direction to the plane, we can calculate a maximum marching distance along that dir + // until we finish that boundary segment and continue on the next + if( std::abs(polyNormal.z) > 1e-5 ) + { + t = std::min(t, (nextBoundaryPoint - startingPoint).Length()); + } + + // check if the direction hits the loop start - if yes, we got a poly to output + IfcVector3 dirToThatPoint = proj * resultpoly.front() - startingPoint; + IfcFloat tpt = dirToThatPoint * dirAtPolyPlane; + if( tpt > -1e-6 && tpt <= t && (dirToThatPoint - tpt * dirAtPolyPlane).SquareLength() < 1e-10 ) + { + nextIntsecIdx = intersections.size(); // dirty hack to end marching along the boundary and signal the end of the loop + t = tpt; + } + + // also check if the direction hits any in->out intersections earlier. If we hit one, we can switch back + // to marching along the poly border from that intersection point + for( size_t a = 0; a < intersections.size(); a += 2 ) + { + dirToThatPoint = proj * std::get<1>(intersections[a]) - startingPoint; + tpt = dirToThatPoint * dirAtPolyPlane; + if( tpt > -1e-6 && tpt <= t && (dirToThatPoint - tpt * dirAtPolyPlane).SquareLength() < 1e-10 ) + { + nextIntsecIdx = a; // switch back to poly and march on from this in->out intersection + t = tpt; + } + } + + // if we keep marching on the boundary, put the segment end point to the result poly and well... keep marching + if( nextIntsecIdx == SIZE_MAX ) + { + resultpoly.push_back(proj_inv * nextBoundaryPoint); + currentBoundaryEdgeIdx = nextBoundaryEdgeIdx; + startingPoint = nextBoundaryPoint; + } + + // quick endless loop check + if( resultpoly.size() > blackside.size() + profile->verts.size() ) + { + IFCImporter::LogError("Encountered endless loop while clipping polygon against poly-bounded half space."); + break; + } + } + + // we're back on the poly - if this is the intersection we started from, we got a closed loop. + if( nextIntsecIdx >= intersections.size() ) + { + break; + } + + // otherwise it's another intersection. Continue marching from there. + currentIntersecIdx = nextIntsecIdx; + } + + WritePolygon(resultpoly, result); + } + } + } + IFCImporter::LogDebug("generating CSG geometry by plane clipping with polygonal bounding (IfcBooleanClippingResult)"); } // ------------------------------------------------------------------------------------------------ -void ProcessBooleanExtrudedAreaSolidDifference(const IfcExtrudedAreaSolid* as, TempMesh& result, - const TempMesh& first_operand, - ConversionData& conv) +void ProcessBooleanExtrudedAreaSolidDifference(const IfcExtrudedAreaSolid* as, TempMesh& result, + const TempMesh& first_operand, + ConversionData& conv) { - ai_assert(as != NULL); + ai_assert(as != NULL); - // This case is handled by reduction to an instance of the quadrify() algorithm. - // Obviously, this won't work for arbitrarily complex cases. In fact, the first - // operand should be near-planar. Luckily, this is usually the case in Ifc - // buildings. + // This case is handled by reduction to an instance of the quadrify() algorithm. + // Obviously, this won't work for arbitrarily complex cases. In fact, the first + // operand should be near-planar. Luckily, this is usually the case in Ifc + // buildings. - boost::shared_ptr<TempMesh> meshtmp = boost::shared_ptr<TempMesh>(new TempMesh()); - ProcessExtrudedAreaSolid(*as,*meshtmp,conv,false); + std::shared_ptr<TempMesh> meshtmp = std::shared_ptr<TempMesh>(new TempMesh()); + ProcessExtrudedAreaSolid(*as,*meshtmp,conv,false); - std::vector<TempOpening> openings(1, TempOpening(as,IfcVector3(0,0,0),meshtmp,boost::shared_ptr<TempMesh>())); + std::vector<TempOpening> openings(1, TempOpening(as,IfcVector3(0,0,0),meshtmp,std::shared_ptr<TempMesh>())); - result = first_operand; + result = first_operand; - TempMesh temp; + TempMesh temp; - std::vector<IfcVector3>::const_iterator vit = first_operand.verts.begin(); - BOOST_FOREACH(unsigned int pcount, first_operand.vertcnt) { - temp.Clear(); + std::vector<IfcVector3>::const_iterator vit = first_operand.verts.begin(); + for(unsigned int pcount : first_operand.vertcnt) { + temp.Clear(); - temp.verts.insert(temp.verts.end(), vit, vit + pcount); - temp.vertcnt.push_back(pcount); + temp.verts.insert(temp.verts.end(), vit, vit + pcount); + temp.vertcnt.push_back(pcount); - // The algorithms used to generate mesh geometry sometimes - // spit out lines or other degenerates which must be - // filtered to avoid running into assertions later on. + // The algorithms used to generate mesh geometry sometimes + // spit out lines or other degenerates which must be + // filtered to avoid running into assertions later on. - // ComputePolygonNormal returns the Newell normal, so the - // length of the normal is the area of the polygon. - const IfcVector3& normal = temp.ComputeLastPolygonNormal(false); - if (normal.SquareLength() < static_cast<IfcFloat>(1e-5)) { - IFCImporter::LogWarn("skipping degenerate polygon (ProcessBooleanExtrudedAreaSolidDifference)"); - continue; - } + // ComputePolygonNormal returns the Newell normal, so the + // length of the normal is the area of the polygon. + const IfcVector3& normal = temp.ComputeLastPolygonNormal(false); + if (normal.SquareLength() < static_cast<IfcFloat>(1e-5)) { + IFCImporter::LogWarn("skipping degenerate polygon (ProcessBooleanExtrudedAreaSolidDifference)"); + continue; + } - GenerateOpenings(openings, std::vector<IfcVector3>(1,IfcVector3(1,0,0)), temp, false, true); - result.Append(temp); + GenerateOpenings(openings, std::vector<IfcVector3>(1,IfcVector3(1,0,0)), temp, false, true); + result.Append(temp); - vit += pcount; - } + vit += pcount; + } - IFCImporter::LogDebug("generating CSG geometry by geometric difference to a solid (IfcExtrudedAreaSolid)"); + IFCImporter::LogDebug("generating CSG geometry by geometric difference to a solid (IfcExtrudedAreaSolid)"); } // ------------------------------------------------------------------------------------------------ void ProcessBoolean(const IfcBooleanResult& boolean, TempMesh& result, ConversionData& conv) { - // supported CSG operations: - // DIFFERENCE - if(const IfcBooleanResult* const clip = boolean.ToPtr<IfcBooleanResult>()) { - if(clip->Operator != "DIFFERENCE") { - IFCImporter::LogWarn("encountered unsupported boolean operator: " + (std::string)clip->Operator); - return; - } - - // supported cases (1st operand): - // IfcBooleanResult -- call ProcessBoolean recursively - // IfcSweptAreaSolid -- obtain polygonal geometry first - - // supported cases (2nd operand): - // IfcHalfSpaceSolid -- easy, clip against plane - // IfcExtrudedAreaSolid -- reduce to an instance of the quadrify() algorithm - - - const IfcHalfSpaceSolid* const hs = clip->SecondOperand->ResolveSelectPtr<IfcHalfSpaceSolid>(conv.db); - const IfcExtrudedAreaSolid* const as = clip->SecondOperand->ResolveSelectPtr<IfcExtrudedAreaSolid>(conv.db); - if(!hs && !as) { - IFCImporter::LogError("expected IfcHalfSpaceSolid or IfcExtrudedAreaSolid as second clipping operand"); - return; - } - - TempMesh first_operand; - if(const IfcBooleanResult* const op0 = clip->FirstOperand->ResolveSelectPtr<IfcBooleanResult>(conv.db)) { - ProcessBoolean(*op0,first_operand,conv); - } - else if (const IfcSweptAreaSolid* const swept = clip->FirstOperand->ResolveSelectPtr<IfcSweptAreaSolid>(conv.db)) { - ProcessSweptAreaSolid(*swept,first_operand,conv); - } - else { - IFCImporter::LogError("expected IfcSweptAreaSolid or IfcBooleanResult as first clipping operand"); - return; - } - - if(hs) { - - const IfcPolygonalBoundedHalfSpace* const hs_bounded = clip->SecondOperand->ResolveSelectPtr<IfcPolygonalBoundedHalfSpace>(conv.db); - if (hs_bounded) { - ProcessPolygonalBoundedBooleanHalfSpaceDifference(hs_bounded, result, first_operand, conv); - } - else { - ProcessBooleanHalfSpaceDifference(hs, result, first_operand, conv); - } - } - else { - ProcessBooleanExtrudedAreaSolidDifference(as, result, first_operand, conv); - } - } - else { - IFCImporter::LogWarn("skipping unknown IfcBooleanResult entity, type is " + boolean.GetClassName()); - } + // supported CSG operations: + // DIFFERENCE + if(const IfcBooleanResult* const clip = boolean.ToPtr<IfcBooleanResult>()) { + if(clip->Operator != "DIFFERENCE") { + IFCImporter::LogWarn("encountered unsupported boolean operator: " + (std::string)clip->Operator); + return; + } + + // supported cases (1st operand): + // IfcBooleanResult -- call ProcessBoolean recursively + // IfcSweptAreaSolid -- obtain polygonal geometry first + + // supported cases (2nd operand): + // IfcHalfSpaceSolid -- easy, clip against plane + // IfcExtrudedAreaSolid -- reduce to an instance of the quadrify() algorithm + + + const IfcHalfSpaceSolid* const hs = clip->SecondOperand->ResolveSelectPtr<IfcHalfSpaceSolid>(conv.db); + const IfcExtrudedAreaSolid* const as = clip->SecondOperand->ResolveSelectPtr<IfcExtrudedAreaSolid>(conv.db); + if(!hs && !as) { + IFCImporter::LogError("expected IfcHalfSpaceSolid or IfcExtrudedAreaSolid as second clipping operand"); + return; + } + + TempMesh first_operand; + if(const IfcBooleanResult* const op0 = clip->FirstOperand->ResolveSelectPtr<IfcBooleanResult>(conv.db)) { + ProcessBoolean(*op0,first_operand,conv); + } + else if (const IfcSweptAreaSolid* const swept = clip->FirstOperand->ResolveSelectPtr<IfcSweptAreaSolid>(conv.db)) { + ProcessSweptAreaSolid(*swept,first_operand,conv); + } + else { + IFCImporter::LogError("expected IfcSweptAreaSolid or IfcBooleanResult as first clipping operand"); + return; + } + + if(hs) { + + const IfcPolygonalBoundedHalfSpace* const hs_bounded = clip->SecondOperand->ResolveSelectPtr<IfcPolygonalBoundedHalfSpace>(conv.db); + if (hs_bounded) { + ProcessPolygonalBoundedBooleanHalfSpaceDifference(hs_bounded, result, first_operand, conv); + } + else { + ProcessBooleanHalfSpaceDifference(hs, result, first_operand, conv); + } + } + else { + ProcessBooleanExtrudedAreaSolidDifference(as, result, first_operand, conv); + } + } + else { + IFCImporter::LogWarn("skipping unknown IfcBooleanResult entity, type is " + boolean.GetClassName()); + } } } // ! IFC } // ! Assimp -#endif +#endif |