question: private double psfunc3 ( double x , double t1 , double t2 , int dim ) { dim = dim + 1 ; double xy = 4 * ( x - 0.5 ) ; if ( lType == 31 ) { double rate = dim / ( double ) numberOfVariables ; return xy - 4 * ( t1 * t1 * rate + t2 * ( 1.0 - rate ) ) + 2 ; } else if ( lType == 32 ) { double theta = 2 * Math . PI * t1 + dim * Math . PI / numberOfVariables ; return xy - 2 * t2 * Math . sin ( theta ) ; } else { throw new IllegalStateException ( ) ; } }
target:  Controls the Pareto set shape for 3D instances.