0025376: Inconsistence between function and derivatives evaluation in Extrema_GlobOptFuncCS.

Changed "value" function behavior in Extrema/Extrema_GlobOptFuncCS.cxx. Now it compute square distance between point on curve and point on surface.

Fixed description in Extrema_GlobOptFuncCC.

src/Extrema/Extrema_GlobOptFuncCC.hxx

@@ -24,8 +24,8 @@
 #include <math_MultipleVarFunctionWithGradient.hxx>
 #include <math_MultipleVarFunctionWithHessian.hxx>
 
-//! This class implements function which operates with Eucluidean distance <br>
+//! This class implements function which calculate Eucluidean distance
-//! between 2 curves in case of C1 and C2 continuity is C0.
+//! between point on curve and point on other curve in case of C1 and C2 continuity is C0.
 class Extrema_GlobOptFuncCCC0 : public math_MultipleVarFunction
 {
 public:
@@ -53,8 +53,8 @@ private:
 };
 
 
-//! This class implements function which operates with Eucluidean distance <br>
+//! This class implements function which calculate Eucluidean distance
-//! between 2 curves in case of C1 and C2 continuity is C1.
+//! between point on curve and point on other curve in case of C1 and C2 continuity is C1.
 class Extrema_GlobOptFuncCCC1 : public math_MultipleVarFunctionWithGradient
 {
 public:
@@ -84,8 +84,8 @@ private:
 };
 
 
-//! This class implements function which operates with Eucluidean distance <br>
+//! This class implements function which calculate Eucluidean distance
-//! between 2 curves in case of C1 and C2 continuity is C2 or more.
+//! between point on curve and point on other curve in case of C1 and C2 continuity is C2.
 class Extrema_GlobOptFuncCCC2 : public math_MultipleVarFunctionWithHessian
 {
 public:

src/Extrema/Extrema_GlobOptFuncCS.cxx

@@ -21,9 +21,9 @@
 #include <Standard_Integer.hxx>
 #include <Standard_OutOfRange.hxx>
 
-//! F = Sqrt( (x1(cu) - x2(su,sv))^2
+//!F(cu, su, sv)=(C^{(x)}(cu)-S^{(x)}(su,sv))^{2}+
-//          + (y1(cu) - y2(su,sv))^2
+//               (C^{(y)}(cu)-S^{(y)}(su,sv))^{2}+
-//          + (z1(cu) - z2(su,sv))^2 )
+//               (C^{(z)}(cu)-S^{(z)}(su,sv))^{2}
 
 
 //=======================================================================
@@ -35,7 +35,7 @@ void Extrema_GlobOptFuncCS::value(Standard_Real cu,
                                   Standard_Real sv,
                                   Standard_Real &F)
 {
-  F = myC->Value(cu).Distance(myS->Value(su, sv));
+  F = myC->Value(cu).SquareDistance(myS->Value(su, sv));
 }
 
 //=======================================================================
@@ -85,33 +85,41 @@ void Extrema_GlobOptFuncCS::hessian(Standard_Real cu,
            + (CD0.X() - SD0.X()) * CD2.X()
            + (CD0.Y() - SD0.Y()) * CD2.Y()
            + (CD0.Z() - SD0.Z()) * CD2.Z();
+
   H(1,2) = - CD1.X() * SD1U.X()
            - CD1.Y() * SD1U.Y()
            - CD1.Z() * SD1U.Z();
+
   H(1,3) = - CD1.X() * SD1V.X()
            - CD1.Y() * SD1V.Y()
            - CD1.Z() * SD1V.Z();
+
   H(2,1) = H(1,2);
+
   H(2,2) = + SD1U.X() * SD1U.X()
            + SD1U.Y() * SD1U.Y()
            + SD1U.Z() * SD1U.Z()
            - (CD0.X() - SD0.X()) * SD2UU.X()
-           - (CD0.X() - SD0.X()) * SD2UU.Y()
+           - (CD0.Y() - SD0.Y()) * SD2UU.Y()
-           - (CD0.X() - SD0.X()) * SD2UU.Z();
+           - (CD0.Z() - SD0.Z()) * SD2UU.Z();
+
   H(2,3) = + SD1U.X() * SD1V.X()
            + SD1U.Y() * SD1V.Y()
            + SD1U.Z() * SD1V.Z()
            - (CD0.X() - SD0.X()) * SD2UV.X()
-           - (CD0.X() - SD0.X()) * SD2UV.Y()
+           - (CD0.Y() - SD0.Y()) * SD2UV.Y()
-           - (CD0.X() - SD0.X()) * SD2UV.Z();
+           - (CD0.Z() - SD0.Z()) * SD2UV.Z();
+
   H(3,1) = H(1,3);
+
   H(3,2) = H(2,3);
+
   H(3,3) = + SD1V.X() * SD1V.X()
            + SD1V.Y() * SD1V.Y()
            + SD1V.Z() * SD1V.Z()
            - (CD0.X() - SD0.X()) * SD2VV.X()
-           - (CD0.X() - SD0.X()) * SD2VV.Y()
+           - (CD0.Y() - SD0.Y()) * SD2VV.Y()
-           - (CD0.X() - SD0.X()) * SD2VV.Z();
+           - (CD0.Z() - SD0.Z()) * SD2VV.Z();
 }
 
 //=======================================================================

src/Extrema/Extrema_GlobOptFuncCS.hxx

@@ -23,7 +23,7 @@
 #include <math_Vector.hxx>
 #include <math_MultipleVarFunctionWithHessian.hxx>
 
-//! This class implements function which calculate Eucluidean distance
+//! This class implements function which calculate square Eucluidean distance
 //! between point on curve and point on surface in case of continuity is C2.
 class Extrema_GlobOptFuncCS : public math_MultipleVarFunctionWithHessian
 {

src/math/math_PSO.cxx

@@ -85,7 +85,7 @@ void math_PSO::Perform(const math_Vector& theSteps,
   {
     myFunc->Value(aCurrPoint, aCurrValue);
 
-    if (aCurrValue * aCurrValue < aParticle->Distance)
+    if (aCurrValue < aParticle->Distance)
     {
       Standard_Integer aDimIdx;
       for(aDimIdx = 0; aDimIdx < myN; ++aDimIdx)
@@ -93,8 +93,8 @@ void math_PSO::Perform(const math_Vector& theSteps,
         aParticle->Position[aDimIdx] = aCurrPoint(aDimIdx + 1);
         aParticle->BestPosition[aDimIdx] = aCurrPoint(aDimIdx + 1);
       }
-      aParticle->Distance     = aCurrValue * aCurrValue;
+      aParticle->Distance     = aCurrValue;
-      aParticle->BestDistance = aCurrValue * aCurrValue;
+      aParticle->BestDistance = aCurrValue;
 
       aParticle = aPool.GetWorstParticle();
     }
@@ -199,7 +199,6 @@ void math_PSO::performPSOWithGivenParticles(math_PSOParticlesPool& theParticles,
       }
 
       myFunc->Value(aCurrPoint, aParticle->Distance);
-      aParticle->Distance *= aParticle->Distance;
       if(aParticle->Distance < aParticle->BestDistance)
       {
         aParticle->BestDistance = aParticle->Distance;