618 lines
22 KiB
C++
618 lines
22 KiB
C++
/*
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Open Asset Import Library (assimp)
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----------------------------------------------------------------------
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Copyright (c) 2006-2017, assimp team
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All rights reserved.
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Redistribution and use of this software in source and binary forms,
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with or without modification, are permitted provided that the
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following conditions are met:
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* Redistributions of source code must retain the above
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copyright notice, this list of conditions and the
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following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the
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following disclaimer in the documentation and/or other
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materials provided with the distribution.
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* Neither the name of the assimp team, nor the names of its
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contributors may be used to endorse or promote products
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derived from this software without specific prior
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written permission of the assimp team.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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----------------------------------------------------------------------
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*/
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/** @file IFCProfile.cpp
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* @brief Read profile and curves entities from IFC files
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*/
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#ifndef ASSIMP_BUILD_NO_IFC_IMPORTER
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#include "IFCUtil.h"
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namespace Assimp {
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namespace IFC {
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namespace {
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// --------------------------------------------------------------------------------
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// Conic is the base class for Circle and Ellipse
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// --------------------------------------------------------------------------------
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class Conic : public Curve {
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public:
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// --------------------------------------------------
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Conic(const IfcConic& entity, ConversionData& conv)
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: Curve(entity,conv) {
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IfcMatrix4 trafo;
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ConvertAxisPlacement(trafo,*entity.Position,conv);
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// for convenience, extract the matrix rows
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location = IfcVector3(trafo.a4,trafo.b4,trafo.c4);
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p[0] = IfcVector3(trafo.a1,trafo.b1,trafo.c1);
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p[1] = IfcVector3(trafo.a2,trafo.b2,trafo.c2);
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p[2] = IfcVector3(trafo.a3,trafo.b3,trafo.c3);
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}
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// --------------------------------------------------
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bool IsClosed() const {
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return true;
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}
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// --------------------------------------------------
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size_t EstimateSampleCount(IfcFloat a, IfcFloat b) const {
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ai_assert( InRange( a ) );
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ai_assert( InRange( b ) );
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a *= conv.angle_scale;
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b *= conv.angle_scale;
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a = std::fmod(a,static_cast<IfcFloat>( AI_MATH_TWO_PI ));
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b = std::fmod(b,static_cast<IfcFloat>( AI_MATH_TWO_PI ));
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const IfcFloat setting = static_cast<IfcFloat>( AI_MATH_PI * conv.settings.conicSamplingAngle / 180.0 );
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return static_cast<size_t>( std::ceil(std::abs( b-a)) / setting);
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}
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// --------------------------------------------------
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ParamRange GetParametricRange() const {
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return std::make_pair(static_cast<IfcFloat>( 0. ), static_cast<IfcFloat>( AI_MATH_TWO_PI / conv.angle_scale ));
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}
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protected:
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IfcVector3 location, p[3];
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};
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// --------------------------------------------------------------------------------
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// Circle
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// --------------------------------------------------------------------------------
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class Circle : public Conic {
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public:
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// --------------------------------------------------
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Circle(const IfcCircle& entity, ConversionData& conv)
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: Conic(entity,conv)
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, entity(entity)
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{
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}
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// --------------------------------------------------
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IfcVector3 Eval(IfcFloat u) const {
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u = -conv.angle_scale * u;
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return location + static_cast<IfcFloat>(entity.Radius)*(static_cast<IfcFloat>(std::cos(u))*p[0] +
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static_cast<IfcFloat>(std::sin(u))*p[1]);
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}
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private:
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const IfcCircle& entity;
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};
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// --------------------------------------------------------------------------------
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// Ellipse
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// --------------------------------------------------------------------------------
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class Ellipse : public Conic {
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public:
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// --------------------------------------------------
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Ellipse(const IfcEllipse& entity, ConversionData& conv)
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: Conic(entity,conv)
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, entity(entity) {
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// empty
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}
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// --------------------------------------------------
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IfcVector3 Eval(IfcFloat u) const {
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u = -conv.angle_scale * u;
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return location + static_cast<IfcFloat>(entity.SemiAxis1)*static_cast<IfcFloat>(std::cos(u))*p[0] +
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static_cast<IfcFloat>(entity.SemiAxis2)*static_cast<IfcFloat>(std::sin(u))*p[1];
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}
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private:
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const IfcEllipse& entity;
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};
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// --------------------------------------------------------------------------------
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// Line
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// --------------------------------------------------------------------------------
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class Line : public Curve {
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public:
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// --------------------------------------------------
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Line(const IfcLine& entity, ConversionData& conv)
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: Curve(entity,conv) {
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ConvertCartesianPoint(p,entity.Pnt);
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ConvertVector(v,entity.Dir);
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}
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// --------------------------------------------------
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bool IsClosed() const {
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return false;
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}
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// --------------------------------------------------
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IfcVector3 Eval(IfcFloat u) const {
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return p + u*v;
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}
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// --------------------------------------------------
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size_t EstimateSampleCount(IfcFloat a, IfcFloat b) const {
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ai_assert( InRange( a ) );
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ai_assert( InRange( b ) );
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// two points are always sufficient for a line segment
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return a==b ? 1 : 2;
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}
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// --------------------------------------------------
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void SampleDiscrete(TempMesh& out,IfcFloat a, IfcFloat b) const {
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ai_assert( InRange( a ) );
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ai_assert( InRange( b ) );
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if (a == b) {
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out.verts.push_back(Eval(a));
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return;
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}
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out.verts.reserve(out.verts.size()+2);
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out.verts.push_back(Eval(a));
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out.verts.push_back(Eval(b));
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}
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// --------------------------------------------------
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ParamRange GetParametricRange() const {
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const IfcFloat inf = std::numeric_limits<IfcFloat>::infinity();
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return std::make_pair(-inf,+inf);
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}
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private:
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IfcVector3 p,v;
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};
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// --------------------------------------------------------------------------------
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// CompositeCurve joins multiple smaller, bounded curves
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// --------------------------------------------------------------------------------
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class CompositeCurve : public BoundedCurve {
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typedef std::pair< std::shared_ptr< BoundedCurve >, bool > CurveEntry;
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public:
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// --------------------------------------------------
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CompositeCurve(const IfcCompositeCurve& entity, ConversionData& conv)
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: BoundedCurve(entity,conv)
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, total() {
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curves.reserve(entity.Segments.size());
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for(const IfcCompositeCurveSegment& curveSegment :entity.Segments) {
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// according to the specification, this must be a bounded curve
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std::shared_ptr< Curve > cv(Curve::Convert(curveSegment.ParentCurve,conv));
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std::shared_ptr< BoundedCurve > bc = std::dynamic_pointer_cast<BoundedCurve>(cv);
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if (!bc) {
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IFCImporter::LogError("expected segment of composite curve to be a bounded curve");
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continue;
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}
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if ( (std::string)curveSegment.Transition != "CONTINUOUS" ) {
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IFCImporter::LogDebug("ignoring transition code on composite curve segment, only continuous transitions are supported");
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}
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curves.push_back( CurveEntry(bc,IsTrue(curveSegment.SameSense)) );
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total += bc->GetParametricRangeDelta();
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}
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if (curves.empty()) {
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throw CurveError("empty composite curve");
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}
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}
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// --------------------------------------------------
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IfcVector3 Eval(IfcFloat u) const {
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if (curves.empty()) {
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return IfcVector3();
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}
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IfcFloat acc = 0;
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for(const CurveEntry& entry : curves) {
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const ParamRange& range = entry.first->GetParametricRange();
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const IfcFloat delta = std::abs(range.second-range.first);
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if (u < acc+delta) {
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return entry.first->Eval( entry.second ? (u-acc) + range.first : range.second-(u-acc));
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}
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acc += delta;
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}
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// clamp to end
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return curves.back().first->Eval(curves.back().first->GetParametricRange().second);
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}
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// --------------------------------------------------
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size_t EstimateSampleCount(IfcFloat a, IfcFloat b) const {
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ai_assert( InRange( a ) );
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ai_assert( InRange( b ) );
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size_t cnt = 0;
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IfcFloat acc = 0;
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for(const CurveEntry& entry : curves) {
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const ParamRange& range = entry.first->GetParametricRange();
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const IfcFloat delta = std::abs(range.second-range.first);
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if (a <= acc+delta && b >= acc) {
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const IfcFloat at = std::max(static_cast<IfcFloat>( 0. ),a-acc), bt = std::min(delta,b-acc);
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cnt += entry.first->EstimateSampleCount( entry.second ? at + range.first : range.second - bt, entry.second ? bt + range.first : range.second - at );
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}
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acc += delta;
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}
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return cnt;
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}
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// --------------------------------------------------
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void SampleDiscrete(TempMesh& out,IfcFloat a, IfcFloat b) const {
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ai_assert( InRange( a ) );
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ai_assert( InRange( b ) );
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const size_t cnt = EstimateSampleCount(a,b);
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out.verts.reserve(out.verts.size() + cnt);
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for(const CurveEntry& entry : curves) {
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const size_t cnt = out.verts.size();
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entry.first->SampleDiscrete(out);
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if (!entry.second && cnt != out.verts.size()) {
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std::reverse(out.verts.begin()+cnt,out.verts.end());
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}
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}
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}
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// --------------------------------------------------
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ParamRange GetParametricRange() const {
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return std::make_pair(static_cast<IfcFloat>( 0. ),total);
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}
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private:
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std::vector< CurveEntry > curves;
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IfcFloat total;
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};
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// --------------------------------------------------------------------------------
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// TrimmedCurve can be used to trim an unbounded curve to a bounded range
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// --------------------------------------------------------------------------------
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class TrimmedCurve : public BoundedCurve {
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public:
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// --------------------------------------------------
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TrimmedCurve(const IfcTrimmedCurve& entity, ConversionData& conv)
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: BoundedCurve(entity,conv)
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{
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base = std::shared_ptr<const Curve>(Curve::Convert(entity.BasisCurve,conv));
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typedef std::shared_ptr<const STEP::EXPRESS::DataType> Entry;
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// for some reason, trimmed curves can either specify a parametric value
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// or a point on the curve, or both. And they can even specify which of the
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// two representations they prefer, even though an information invariant
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// claims that they must be identical if both are present.
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// oh well.
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bool have_param = false, have_point = false;
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IfcVector3 point;
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for(const Entry sel :entity.Trim1) {
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if (const EXPRESS::REAL* const r = sel->ToPtr<EXPRESS::REAL>()) {
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range.first = *r;
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have_param = true;
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break;
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}
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else if (const IfcCartesianPoint* const r = sel->ResolveSelectPtr<IfcCartesianPoint>(conv.db)) {
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ConvertCartesianPoint(point,*r);
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have_point = true;
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}
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}
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if (!have_param) {
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if (!have_point || !base->ReverseEval(point,range.first)) {
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throw CurveError("IfcTrimmedCurve: failed to read first trim parameter, ignoring curve");
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}
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}
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have_param = false, have_point = false;
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for(const Entry sel :entity.Trim2) {
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if (const EXPRESS::REAL* const r = sel->ToPtr<EXPRESS::REAL>()) {
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range.second = *r;
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have_param = true;
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break;
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}
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else if (const IfcCartesianPoint* const r = sel->ResolveSelectPtr<IfcCartesianPoint>(conv.db)) {
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ConvertCartesianPoint(point,*r);
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have_point = true;
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}
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}
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if (!have_param) {
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if (!have_point || !base->ReverseEval(point,range.second)) {
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throw CurveError("IfcTrimmedCurve: failed to read second trim parameter, ignoring curve");
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}
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}
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agree_sense = IsTrue(entity.SenseAgreement);
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if( !agree_sense ) {
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std::swap(range.first,range.second);
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}
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// "NOTE In case of a closed curve, it may be necessary to increment t1 or t2
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// by the parametric length for consistency with the sense flag."
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if (base->IsClosed()) {
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if( range.first > range.second ) {
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range.second += base->GetParametricRangeDelta();
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}
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}
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maxval = range.second-range.first;
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ai_assert(maxval >= 0);
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}
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// --------------------------------------------------
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IfcVector3 Eval(IfcFloat p) const {
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ai_assert(InRange(p));
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return base->Eval( TrimParam(p) );
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}
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// --------------------------------------------------
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size_t EstimateSampleCount(IfcFloat a, IfcFloat b) const {
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ai_assert( InRange( a ) );
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ai_assert( InRange( b ) );
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return base->EstimateSampleCount(TrimParam(a),TrimParam(b));
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}
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// --------------------------------------------------
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void SampleDiscrete(TempMesh& out,IfcFloat a,IfcFloat b) const {
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ai_assert(InRange(a) && InRange(b));
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return base->SampleDiscrete(out,TrimParam(a),TrimParam(b));
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}
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// --------------------------------------------------
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ParamRange GetParametricRange() const {
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return std::make_pair(static_cast<IfcFloat>( 0. ),maxval);
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}
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private:
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// --------------------------------------------------
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IfcFloat TrimParam(IfcFloat f) const {
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return agree_sense ? f + range.first : range.second - f;
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}
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private:
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ParamRange range;
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IfcFloat maxval;
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bool agree_sense;
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std::shared_ptr<const Curve> base;
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};
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// --------------------------------------------------------------------------------
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// PolyLine is a 'curve' defined by linear interpolation over a set of discrete points
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// --------------------------------------------------------------------------------
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class PolyLine : public BoundedCurve {
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public:
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// --------------------------------------------------
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PolyLine(const IfcPolyline& entity, ConversionData& conv)
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: BoundedCurve(entity,conv)
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{
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points.reserve(entity.Points.size());
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IfcVector3 t;
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for(const IfcCartesianPoint& cp : entity.Points) {
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ConvertCartesianPoint(t,cp);
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points.push_back(t);
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}
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}
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// --------------------------------------------------
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IfcVector3 Eval(IfcFloat p) const {
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ai_assert(InRange(p));
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const size_t b = static_cast<size_t>(std::floor(p));
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if (b == points.size()-1) {
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return points.back();
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}
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const IfcFloat d = p-static_cast<IfcFloat>(b);
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return points[b+1] * d + points[b] * (static_cast<IfcFloat>( 1. )-d);
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}
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// --------------------------------------------------
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size_t EstimateSampleCount(IfcFloat a, IfcFloat b) const {
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ai_assert(InRange(a) && InRange(b));
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return static_cast<size_t>( std::ceil(b) - std::floor(a) );
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}
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// --------------------------------------------------
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ParamRange GetParametricRange() const {
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return std::make_pair(static_cast<IfcFloat>( 0. ),static_cast<IfcFloat>(points.size()-1));
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}
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private:
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std::vector<IfcVector3> points;
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};
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} // anon
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// ------------------------------------------------------------------------------------------------
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Curve* Curve::Convert(const IFC::IfcCurve& curve,ConversionData& conv) {
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if(curve.ToPtr<IfcBoundedCurve>()) {
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if(const IfcPolyline* c = curve.ToPtr<IfcPolyline>()) {
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return new PolyLine(*c,conv);
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}
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if(const IfcTrimmedCurve* c = curve.ToPtr<IfcTrimmedCurve>()) {
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return new TrimmedCurve(*c,conv);
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}
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if(const IfcCompositeCurve* c = curve.ToPtr<IfcCompositeCurve>()) {
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return new CompositeCurve(*c,conv);
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}
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}
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if(curve.ToPtr<IfcConic>()) {
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if(const IfcCircle* c = curve.ToPtr<IfcCircle>()) {
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return new Circle(*c,conv);
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}
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if(const IfcEllipse* c = curve.ToPtr<IfcEllipse>()) {
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return new Ellipse(*c,conv);
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}
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}
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if(const IfcLine* c = curve.ToPtr<IfcLine>()) {
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return new Line(*c,conv);
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}
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// XXX OffsetCurve2D, OffsetCurve3D not currently supported
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return NULL;
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}
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#ifdef ASSIMP_BUILD_DEBUG
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// ------------------------------------------------------------------------------------------------
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bool Curve::InRange(IfcFloat u) const {
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const ParamRange range = GetParametricRange();
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if (IsClosed()) {
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return true;
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}
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const IfcFloat epsilon = 1e-5;
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return u - range.first > -epsilon && range.second - u > -epsilon;
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}
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#endif
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// ------------------------------------------------------------------------------------------------
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IfcFloat Curve::GetParametricRangeDelta() const {
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const ParamRange& range = GetParametricRange();
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return std::abs(range.second - range.first);
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}
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// ------------------------------------------------------------------------------------------------
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size_t Curve::EstimateSampleCount(IfcFloat a, IfcFloat b) const {
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(void)(a); (void)(b);
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ai_assert( InRange( a ) );
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ai_assert( InRange( b ) );
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// arbitrary default value, deriving classes should supply better suited values
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return 16;
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}
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// ------------------------------------------------------------------------------------------------
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IfcFloat RecursiveSearch(const Curve* cv, const IfcVector3& val, IfcFloat a, IfcFloat b,
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unsigned int samples, IfcFloat threshold, unsigned int recurse = 0, unsigned int max_recurse = 15) {
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ai_assert(samples>1);
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|
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const IfcFloat delta = (b-a)/samples, inf = std::numeric_limits<IfcFloat>::infinity();
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|
IfcFloat min_point[2] = {a,b}, min_diff[2] = {inf,inf};
|
|
IfcFloat runner = a;
|
|
|
|
for (unsigned int i = 0; i < samples; ++i, runner += delta) {
|
|
const IfcFloat diff = (cv->Eval(runner)-val).SquareLength();
|
|
if (diff < min_diff[0]) {
|
|
min_diff[1] = min_diff[0];
|
|
min_point[1] = min_point[0];
|
|
|
|
min_diff[0] = diff;
|
|
min_point[0] = runner;
|
|
}
|
|
else if (diff < min_diff[1]) {
|
|
min_diff[1] = diff;
|
|
min_point[1] = runner;
|
|
}
|
|
}
|
|
|
|
ai_assert( min_diff[ 0 ] != inf );
|
|
ai_assert( min_diff[ 1 ] != inf );
|
|
if ( std::fabs(a-min_point[0]) < threshold || recurse >= max_recurse) {
|
|
return min_point[0];
|
|
}
|
|
|
|
// fix for closed curves to take their wrap-over into account
|
|
if (cv->IsClosed() && std::fabs(min_point[0]-min_point[1]) > cv->GetParametricRangeDelta()*0.5 ) {
|
|
const Curve::ParamRange& range = cv->GetParametricRange();
|
|
const IfcFloat wrapdiff = (cv->Eval(range.first)-val).SquareLength();
|
|
|
|
if (wrapdiff < min_diff[0]) {
|
|
const IfcFloat t = min_point[0];
|
|
min_point[0] = min_point[1] > min_point[0] ? range.first : range.second;
|
|
min_point[1] = t;
|
|
}
|
|
}
|
|
|
|
return RecursiveSearch(cv,val,min_point[0],min_point[1],samples,threshold,recurse+1,max_recurse);
|
|
}
|
|
|
|
// ------------------------------------------------------------------------------------------------
|
|
bool Curve::ReverseEval(const IfcVector3& val, IfcFloat& paramOut) const
|
|
{
|
|
// note: the following algorithm is not guaranteed to find the 'right' parameter value
|
|
// in all possible cases, but it will always return at least some value so this function
|
|
// will never fail in the default implementation.
|
|
|
|
// XXX derive threshold from curve topology
|
|
static const IfcFloat threshold = 1e-4f;
|
|
static const unsigned int samples = 16;
|
|
|
|
const ParamRange& range = GetParametricRange();
|
|
paramOut = RecursiveSearch(this,val,range.first,range.second,samples,threshold);
|
|
|
|
return true;
|
|
}
|
|
|
|
// ------------------------------------------------------------------------------------------------
|
|
void Curve::SampleDiscrete(TempMesh& out,IfcFloat a, IfcFloat b) const {
|
|
ai_assert( InRange( a ) );
|
|
ai_assert( InRange( b ) );
|
|
|
|
const size_t cnt = std::max(static_cast<size_t>(0),EstimateSampleCount(a,b));
|
|
out.verts.reserve( out.verts.size() + cnt + 1);
|
|
|
|
IfcFloat p = a, delta = (b-a)/cnt;
|
|
for(size_t i = 0; i <= cnt; ++i, p += delta) {
|
|
out.verts.push_back(Eval(p));
|
|
}
|
|
}
|
|
|
|
// ------------------------------------------------------------------------------------------------
|
|
bool BoundedCurve::IsClosed() const {
|
|
return false;
|
|
}
|
|
|
|
// ------------------------------------------------------------------------------------------------
|
|
void BoundedCurve::SampleDiscrete(TempMesh& out) const {
|
|
const ParamRange& range = GetParametricRange();
|
|
ai_assert( range.first != std::numeric_limits<IfcFloat>::infinity() );
|
|
ai_assert( range.second != std::numeric_limits<IfcFloat>::infinity() );
|
|
|
|
return SampleDiscrete(out,range.first,range.second);
|
|
}
|
|
|
|
} // IFC
|
|
} // Assimp
|
|
|
|
#endif // ASSIMP_BUILD_NO_IFC_IMPORTER
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