mirror of
https://git.salome-platform.org/gitpub/modules/smesh.git
synced 2024-12-26 17:30:35 +05:00
enable ComputeParameters() to find a better solution in hard cases
(concave faces) + void refineParametersOnFace( const gp_Pnt& thePoint, gp_XYZ& theParams, int theFaceID );
This commit is contained in:
eap
parent
ab9af27445
commit
24a2dcb5a8
@ -35,7 +35,9 @@
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#include <BRep_Tool.hxx>
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#include <Bnd_Box.hxx>
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#include <Extrema_ExtPC.hxx>
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#include <Extrema_ExtPS.hxx>
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#include <Extrema_POnCurv.hxx>
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#include <Extrema_POnSurf.hxx>
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#include <Geom2d_Curve.hxx>
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#include <ShapeAnalysis.hxx>
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#include <TopExp_Explorer.hxx>
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@ -59,6 +61,7 @@
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#include "utilities.h"
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#include <list>
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#include <limits>
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using namespace std;
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@ -302,6 +305,47 @@ gp_XYZ SMESH_Block::TFace::Point( const gp_XYZ& theParams ) const
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return p;
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}
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namespace
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{
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bool isPntInTria( const gp_XY& p, const gp_XY& t0, const gp_XY& t1, const gp_XY& t2 )
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{
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const double // matrix 2x2
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T11 = t0.X()-t2.X(), T12 = t1.X()-t2.X(),
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T21 = t0.Y()-t2.Y(), T22 = t1.Y()-t2.Y();
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const double Tdet = T11*T22 - T12*T21; // matrix determinant
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if ( Abs( Tdet ) < std::numeric_limits<double>::min() )
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return false;
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// matrix inverse
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const double t11 = T22, t12 = -T12, t21 = -T21, t22 = T11;
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// vector
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const double r11 = p.X()-t2.X(), r12 = p.Y()-t2.Y();
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// barycentric coordinates: mutiply matrix by vector
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const double bc0 = (t11 * r11 + t12 * r12)/Tdet;
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const double bc1 = (t21 * r11 + t22 * r12)/Tdet;
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return ( bc0 >= 0. && bc1 >= 0. && bc0 + bc1 <= 1. );
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}
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bool isPntInQuad( const gp_XY& p,
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const gp_XY& q0, const gp_XY& q1, const gp_XY& q2, const gp_XY& q3 )
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{
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const int in1 = isPntInTria( p, q0, q1, q2 );
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const int in2 = isPntInTria( p, q0, q2, q3 );
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return in1 + in2 == 1;
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}
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}
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bool SMESH_Block::TFace::IsUVInQuad( const gp_XY& uv,
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const gp_XYZ& param0, const gp_XYZ& param1,
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const gp_XYZ& param2, const gp_XYZ& param3 ) const
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{
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gp_XY q0 = GetUV( param0 );
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gp_XY q1 = GetUV( param1 );
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gp_XY q2 = GetUV( param2 );
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gp_XY q3 = GetUV( param3 );
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return isPntInQuad( uv, q0,q1,q2,q3);
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}
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//=======================================================================
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//function : GetShapeCoef
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//purpose :
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@ -580,7 +624,8 @@ Standard_Boolean SMESH_Block::Values(const math_Vector& theXYZ,
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bool SMESH_Block::computeParameters(const gp_Pnt& thePoint,
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gp_XYZ& theParams,
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const gp_XYZ& theParamsHint)
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const gp_XYZ& theParamsHint,
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int theShapeID)
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{
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myPoint = thePoint.XYZ();
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@ -622,8 +667,11 @@ bool SMESH_Block::computeParameters(const gp_Pnt& thePoint,
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theParams = myParam;
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if ( myFaceIndex > 0 )
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{
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theParams.SetCoord( myFaceIndex, myFaceParam );
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if ( distance() > loopTol )
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refineParametersOnFace( thePoint, theParams, theShapeID );
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}
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return true;
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}
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@ -706,7 +754,8 @@ bool SMESH_Block::ComputeParameters(const gp_Pnt& thePoint,
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box.Add( gp_Pnt( prmPtn.second ));
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}
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myGridComputed = true;
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myTolerance = sqrt( box.SquareExtent() ) * 1e-5;
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if ( myTolerance < 0 )
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myTolerance = sqrt( box.SquareExtent() ) * 1e-5;
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}
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}
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@ -764,7 +813,7 @@ bool SMESH_Block::ComputeParameters(const gp_Pnt& thePoint,
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if ( sqDist > sqDistance ) { // solution get worse
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if ( ++nbGetWorst > 2 )
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return computeParameters( thePoint, theParams, solution );
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return computeParameters( thePoint, theParams, solution, theShapeID );
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}
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#ifdef DEBUG_PARAM_COMPUTE
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MESSAGE ( "PARAMS: ( " << params.X() <<" "<< params.Y() <<" "<< params.Z() <<" )" );
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@ -819,20 +868,382 @@ bool SMESH_Block::ComputeParameters(const gp_Pnt& thePoint,
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<< " ------ NB IT: " << myNbIterations << ", SUM DIST: " << mySumDist );
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#endif
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if ( myFaceIndex > 0 )
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theParams.SetCoord( myFaceIndex, myFaceParam );
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const double reachedDist = sqrt( sqDistance );
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if ( reachedDist > 1000 * myTolerance &&
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computeParameters( thePoint, theParams, solution ) &&
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// if ( reachedDist > 1000 * myTolerance &&
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// computeParameters( thePoint, theParams, solution ) &&
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// reachedDist > distance() )
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// return true;
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if ( reachedDist > 10 * myTolerance &&
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computeParameters( thePoint, theParams, solution, theShapeID ) &&
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reachedDist > distance() )
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return true;
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theParams = solution;
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myValues[ SQUARE_DIST ] = sqDistance;
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if ( myFaceIndex > 0 )
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theParams.SetCoord( myFaceIndex, myFaceParam );
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if ( reachedDist > 10 * myTolerance && myFaceIndex > 0 )
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refineParametersOnFace( thePoint, theParams, theShapeID );
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return true;
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}
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//================================================================================
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/*!
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* \brief Find more precise solution
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* \param [in] thePoint - the point
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* \param [in,out] theParams - solution to precise
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* \param [in] theFaceID - FACE ID
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*/
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//================================================================================
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void SMESH_Block::refineParametersOnFace( const gp_Pnt& thePoint,
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gp_XYZ& theParams,
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int theFaceID )
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{
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// find UV of thePoint on the FACE
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Standard_Real U,V;
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const TFace& tface = myFace[ theFaceID - ID_FirstF ];
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if ( !tface.Surface() ) return;
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Extrema_ExtPS extPS( thePoint, *tface.Surface(),
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tface.Surface()->UResolution( myTolerance ),
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tface.Surface()->VResolution( myTolerance ));
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if ( !extPS.IsDone() || extPS.NbExt() < 1 )
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return;
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double minDist = 1e100;
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for ( int i = 1; i <= extPS.NbExt(); ++i )
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if ( extPS.SquareDistance( i ) < minDist )
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{
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minDist = extPS.SquareDistance( i );
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extPS.Point( i ).Parameter( U,V );
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}
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if ( minDist > 100 * myTolerance * myTolerance )
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return;
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int nbGetUV = 0; // just for statistics
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// find a range of parameters including the UV
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double xMin, xMax, yMin, yMax;
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gp_XY uv(U,V);
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//#define _DEBUG_REFINE_
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#ifdef _DEBUG_REFINE_
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cout << "SMESH_Block::refineParametersOnFace(): dividing Starts at dist " << distance()<< endl;
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#endif
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double dx = 0.1, xSol = theParams.Coord( tface.GetUInd() );
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double dy = 0.1, ySol = theParams.Coord( tface.GetVInd() );
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gp_XYZ xXYZ( 0,0,0 ); xXYZ.SetCoord( tface.GetUInd(), 1 );
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gp_XYZ yXYZ( 0,0,0 ); yXYZ.SetCoord( tface.GetVInd(), 1 );
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gp_XYZ xy0,xy1,xy2,xy3;
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bool isInQuad = false;
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while ( !isInQuad )
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{
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xMin = Max( 0., xSol - 0.5*dx ); xMax = Min( 1.0, xSol + 0.5*dx );
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yMin = Max( 0., ySol - 0.5*dy ); yMax = Min( 1.0, ySol + 0.5*dy );
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xy0.SetLinearForm( xMin, xXYZ, yMin, yXYZ );
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xy1.SetLinearForm( xMax, xXYZ, yMin, yXYZ );
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xy2.SetLinearForm( xMax, xXYZ, yMax, yXYZ );
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xy3.SetLinearForm( xMin, xXYZ, yMax, yXYZ );
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isInQuad = tface.IsUVInQuad( uv, xy0,xy1,xy2,xy3 );
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nbGetUV += 4;
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if ( !isInQuad )
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{
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dx *= 1.2;
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dy *= 1.2;
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xSol = 0.5 * (xMax + xMin) ;
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ySol = 0.5 * (yMax + yMin) ;
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if ( xMin == 0. && yMin == 0. && xMax == 1. && yMax == 1. ) // avoid infinit loop
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{
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#ifdef _DEBUG_REFINE_
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cout << "SMESH_Block::refineParametersOnFace(): tface.IsUVInQuad() fails" << endl;
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cout << " nbGetUV = " << nbGetUV << endl;
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#endif
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break;
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}
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}
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}
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// refine solution using half-division technic
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gp_XYZ sol = theParams;
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const double paramTol = 0.001;
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while ( dx > paramTol || dy > paramTol )
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{
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// divide along X
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bool xDivided = ( dx > paramTol );
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if ( xDivided )
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{
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double xMid = 0.5 * ( xMin + xMax );
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gp_XYZ parMid1 = xMid * xXYZ + yMin * yXYZ;
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gp_XYZ parMid2 = xMid * xXYZ + yMax * yXYZ;
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nbGetUV += 4;
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if ( tface.IsUVInQuad( uv, xy0,parMid1,parMid2,xy3 ))
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{
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xMax = xMid;
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xy1 = parMid1; xy2 = parMid2;
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}
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else if ( tface.IsUVInQuad( uv, parMid1,xy1,xy2,parMid2 ))
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{
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nbGetUV += 4;
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xMin = xMid;
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xy0 = parMid1; xy3 = parMid2;
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}
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else
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{
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nbGetUV += 8;
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xDivided = false;
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}
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dx = xMax - xMin;
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}
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// divide along Y
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bool yDivided = ( dy > paramTol );
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if ( yDivided )
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{
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double yMid = 0.5 * ( yMin + yMax );
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gp_XYZ parMid2 = xMax * xXYZ + yMid * yXYZ;
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gp_XYZ parMid3 = xMin * xXYZ + yMid * yXYZ;
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nbGetUV += 4;
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if ( tface.IsUVInQuad( uv, xy0,xy1,parMid2,parMid3 ))
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{
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yMax = yMid;
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xy2 = parMid2; xy3 = parMid3;
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}
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else if ( tface.IsUVInQuad( uv, parMid3,parMid2,xy2,xy3 ))
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{
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nbGetUV += 4;
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yMin = yMid;
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xy0 = parMid3; xy1 = parMid2;
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}
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else
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{
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nbGetUV += 8;
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yDivided = false;
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}
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dy = yMax - yMin;
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}
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if ( !xDivided && !yDivided )
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{
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#ifdef _DEBUG_REFINE_
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cout << "SMESH_Block::refineParametersOnFace(): nothing divided" << endl;
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cout << " nbGetUV = " << nbGetUV << endl;
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#endif
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break;
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}
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// evaluate reached distance to thePoint
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sol.SetCoord( tface.GetUInd(), 0.5 * ( xMin + xMax ));
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sol.SetCoord( tface.GetVInd(), 0.5 * ( yMin + yMax ));
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if ( saveBetterSolution( sol, theParams, thePoint.SquareDistance( tface.Point( sol ))))
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{
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#ifdef _DEBUG_REFINE_
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cout << "SMESH_Block::refineParametersOnFace(): dividing suceeded" << endl;
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cout << " nbGetUV = " << nbGetUV << endl;
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#endif
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return;
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}
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}
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#ifdef _DEBUG_REFINE_
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cout << "SMESH_Block::refineParametersOnFace(): dividing Ends at dist " << distance()<< endl;
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cout << " nbGetUV = " << nbGetUV << endl;
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#endif
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//if ( !isInQuad )
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{
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#ifdef _DEBUG_REFINE_
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cout << "SMESH_Block::refineParametersOnFace(): walk around Starts at dist " << distance()<< endl;
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cout << " nbGetUV = " << (nbGetUV=0) << endl;
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#endif
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dx = dy = 0.01;
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xMin = theParams.Coord( tface.GetUInd() );
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yMin = theParams.Coord( tface.GetVInd() );
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yMax = yMin;
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if ( xMin + dx < 1. )
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xMax = xMin + dx;
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else
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xMax = 1, xMin = 1 - dx;
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sol = theParams;
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sol.SetCoord( tface.GetUInd(), xMax );
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sol.SetCoord( tface.GetVInd(), yMax );
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nbGetUV++;
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if ( saveBetterSolution( sol, theParams, thePoint.SquareDistance( tface.Point( sol ))))
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return;
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int nbGetWorstLimit = 20;
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int xMaxNbGetWorst = 0, xMinNbGetWorst = 0, yMaxNbGetWorst = 0, yMinNbGetWorst = 0;
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double xMaxBestDist = 1e100, xMinBestDist = 1e100, yMaxBestDist = 1e100, yMinBestDist = 1e100;
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double x, y, bestDist, dist;
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while ( xMax - xMin < 1 || yMax - yMin < 1 )
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{
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// walk along X
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if ( yMin > 0. )
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{
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bestDist = 1e100;
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for ( x = Max(0.,xMin); x <= xMax+paramTol; x += dx )
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{
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y = Max( 0., yMin - dy );
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sol.SetCoord( tface.GetUInd(), x );
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sol.SetCoord( tface.GetVInd(), y );
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nbGetUV++;
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dist = thePoint.SquareDistance( tface.Point( sol ));
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bestDist = Min( dist, bestDist );
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if ( saveBetterSolution( sol, theParams, dist ))
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return;
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sol.SetCoord( tface.GetUInd(), Min( 1., x + 0.5*dx ));
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sol.SetCoord( tface.GetVInd(), y + 0.5*dy );
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nbGetUV++;
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dist = thePoint.SquareDistance( tface.Point( sol ));
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bestDist = Min( dist, bestDist );
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if ( saveBetterSolution( sol, theParams, dist ))
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return;
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}
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yMin = Max(0., yMin-dy );
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yMinNbGetWorst += ( yMinBestDist < bestDist );
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yMinBestDist = Min( yMinBestDist, bestDist );
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if ( yMinNbGetWorst > nbGetWorstLimit )
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yMin = 0;
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}
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if ( yMax < 1. )
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{
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bestDist = 1e100;
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for ( x = Max(0.,xMin); x <= xMax+paramTol; x += dx )
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{
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y = Min( 1., yMax + dy );
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sol.SetCoord( tface.GetUInd(), x );
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sol.SetCoord( tface.GetVInd(), y );
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nbGetUV++;
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dist = thePoint.SquareDistance( tface.Point( sol ));
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bestDist = Min( dist, bestDist );
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if ( saveBetterSolution( sol, theParams, dist ))
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return;
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sol.SetCoord( tface.GetUInd(), Min( 1., x + 0.5*dx ));
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sol.SetCoord( tface.GetVInd(), y - 0.5*dy );
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nbGetUV++;
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dist = thePoint.SquareDistance( tface.Point( sol ));
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bestDist = Min( dist, bestDist );
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if ( saveBetterSolution( sol, theParams, dist ))
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return;
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}
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yMax = Min(1., yMax+dy );
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yMaxNbGetWorst += ( yMaxBestDist < bestDist );
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yMaxBestDist = Min( yMaxBestDist, bestDist );
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if ( yMaxNbGetWorst > nbGetWorstLimit )
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yMax = 1;
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}
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// walk along Y
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if ( xMin > 0. )
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{
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bestDist = 1e100;
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for ( y = Max(0.,yMin); y <= yMax+paramTol; y += dy )
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{
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x = Max( 0., xMin - dx );
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sol.SetCoord( tface.GetUInd(), x );
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sol.SetCoord( tface.GetVInd(), y );
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nbGetUV++;
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dist = thePoint.SquareDistance( tface.Point( sol ));
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bestDist = Min( dist, bestDist );
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if ( saveBetterSolution( sol, theParams, dist ))
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return;
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sol.SetCoord( tface.GetUInd(), x + 0.5*dx );
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sol.SetCoord( tface.GetVInd(), Min( 1., y + 0.5*dy ));
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nbGetUV++;
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dist = thePoint.SquareDistance( tface.Point( sol ));
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bestDist = Min( dist, bestDist );
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if ( saveBetterSolution( sol, theParams, dist ))
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return;
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}
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xMin = Max(0., xMin-dx );
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xMinNbGetWorst += ( xMinBestDist < bestDist );
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xMinBestDist = Min( xMinBestDist, bestDist );
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if ( xMinNbGetWorst > nbGetWorstLimit )
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xMin = 0;
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}
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if ( xMax < 1. )
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{
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bestDist = 1e100;
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for ( y = Max(0.,yMin); y <= yMax+paramTol; y += dy )
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{
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x = Min( 1., xMax + dx );
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sol.SetCoord( tface.GetUInd(), x );
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sol.SetCoord( tface.GetVInd(), y );
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nbGetUV++;
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dist = thePoint.SquareDistance( tface.Point( sol ));
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bestDist = Min( dist, bestDist );
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if ( saveBetterSolution( sol, theParams, dist ))
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return;
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sol.SetCoord( tface.GetUInd(), x - 0.5*dx);
|
||||
sol.SetCoord( tface.GetVInd(), Min( 1., y + 0.5*dy ));
|
||||
nbGetUV++;
|
||||
dist = thePoint.SquareDistance( tface.Point( sol ));
|
||||
bestDist = Min( dist, bestDist );
|
||||
if ( saveBetterSolution( sol, theParams, dist ))
|
||||
return;
|
||||
}
|
||||
xMax = Min(1., xMax+dx );
|
||||
xMaxNbGetWorst += ( xMaxBestDist < bestDist );
|
||||
xMaxBestDist = Min( xMaxBestDist, bestDist );
|
||||
if ( xMaxNbGetWorst > nbGetWorstLimit )
|
||||
xMax = 1;
|
||||
}
|
||||
}
|
||||
#ifdef _DEBUG_REFINE_
|
||||
cout << "SMESH_Block::refineParametersOnFace(): walk around failed at dist " << distance()<< endl;
|
||||
cout << " nbGetUV = " << nbGetUV << endl;
|
||||
#endif
|
||||
}
|
||||
}
|
||||
|
||||
//================================================================================
|
||||
/*!
|
||||
* \brief Store a solution if it's better than a previous one
|
||||
* \param [in] theNewParams - a new solution
|
||||
* \param [out] theParams - the parameters to store solution in
|
||||
* \param [in] sqDistance - a square distance reached at theNewParams
|
||||
* \return bool - true if the reached distance is within the tolerance
|
||||
*/
|
||||
//================================================================================
|
||||
|
||||
bool SMESH_Block::saveBetterSolution( const gp_XYZ& theNewParams,
|
||||
gp_XYZ& theParams,
|
||||
double sqDistance )
|
||||
{
|
||||
if ( myValues[ SQUARE_DIST ] > sqDistance )
|
||||
{
|
||||
myValues[ SQUARE_DIST ] = sqDistance;
|
||||
theParams = theNewParams;
|
||||
if ( distance() <= myTolerance )
|
||||
return true;
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
//=======================================================================
|
||||
//function : SetTolerance
|
||||
//purpose : set tolerance for ComputeParameters()
|
||||
//=======================================================================
|
||||
|
||||
void SMESH_Block::SetTolerance(const double tol)
|
||||
{
|
||||
if ( tol > 0 )
|
||||
myTolerance = tol;
|
||||
}
|
||||
|
||||
//=======================================================================
|
||||
//function : IsToleranceReached
|
||||
//purpose : return true if solution found by ComputeParameters() is within the tolerance
|
||||
//=======================================================================
|
||||
|
||||
bool SMESH_Block::IsToleranceReached() const
|
||||
{
|
||||
return distance() < myTolerance;
|
||||
}
|
||||
|
||||
//=======================================================================
|
||||
//function : VertexParameters
|
||||
//purpose : return parameters of a vertex given by TShapeID
|
||||
|
||||
@ -246,6 +246,8 @@ public:
|
||||
const gp_XYZ& theParamsHint = gp_XYZ(-1,-1,-1));
|
||||
// compute point parameters in the block.
|
||||
// Note: for edges, it is better to use EdgeParameters()
|
||||
// Return false only in case of "hard" failure, use IsToleranceReached() etc
|
||||
// to evaluate quality of the found solution
|
||||
|
||||
bool VertexParameters(const int theVertexID, gp_XYZ& theParams);
|
||||
// return parameters of a vertex given by TShapeID
|
||||
@ -253,13 +255,17 @@ public:
|
||||
bool EdgeParameters(const int theEdgeID, const double theU, gp_XYZ& theParams);
|
||||
// return parameters of a point given by theU on edge
|
||||
|
||||
void SetTolerance(const double tol);
|
||||
// set tolerance for ComputeParameters()
|
||||
|
||||
public:
|
||||
// ---------------
|
||||
// Block geometry
|
||||
// ---------------
|
||||
double GetTolerance() const { return myTolerance; }
|
||||
// return current tolerance of ComputeParameters()
|
||||
|
||||
bool IsToleranceReached() const;
|
||||
// return true if solution found by ComputeParameters() is within the tolerance
|
||||
|
||||
double DistanceReached() const { return distance(); }
|
||||
// return distance between solution found by ComputeParameters() and thePoint
|
||||
|
||||
public:
|
||||
// ---------
|
||||
@ -352,6 +358,10 @@ public:
|
||||
int GetUInd() const { return myCoordInd[ 0 ]; }
|
||||
int GetVInd() const { return myCoordInd[ 2 ]; }
|
||||
void GetCoefs( int i, const gp_XYZ& theParams, double& eCoef, double& vCoef ) const;
|
||||
const Adaptor3d_Surface* Surface() const { return myS; }
|
||||
bool IsUVInQuad( const gp_XY& uv,
|
||||
const gp_XYZ& param0, const gp_XYZ& param1,
|
||||
const gp_XYZ& param2, const gp_XYZ& param3 ) const;
|
||||
TFace(): myS(0) { myC2d[0]=myC2d[1]=myC2d[2]=myC2d[3]=0; }
|
||||
~TFace();
|
||||
};
|
||||
@ -369,7 +379,9 @@ public:
|
||||
enum { SQUARE_DIST = 0, DRV_1, DRV_2, DRV_3 };
|
||||
double distance () const { return sqrt( myValues[ SQUARE_DIST ]); }
|
||||
double funcValue(double sqDist) const { return mySquareFunc ? sqDist : sqrt(sqDist); }
|
||||
bool computeParameters(const gp_Pnt& thePoint, gp_XYZ& theParams, const gp_XYZ& theParamsHint);
|
||||
bool computeParameters(const gp_Pnt& thePoint, gp_XYZ& theParams, const gp_XYZ& theParamsHint, int);
|
||||
void refineParametersOnFace( const gp_Pnt& thePoint, gp_XYZ& theParams, int theFaceID );
|
||||
bool saveBetterSolution( const gp_XYZ& theNewParams, gp_XYZ& theParams, double sqDistance );
|
||||
|
||||
int myFaceIndex;
|
||||
double myFaceParam;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user