[v8i ss3 API] GetFitCylinder gives wrong results

Hi,

windows7, vs 2005,

I have been trying API function GetFitCylinder but it return strange results. I have example with scann of 3 inch pipe 18646points (theoretical radius 44.45mm)

Using API GetFitCylinder I get result Radius= 54.5mm.  ( BLUE cylinder in the picture below)

Using another software( RED cylinder in the picture below)) I get this results:

Normal estimation is done with 10 neighboars 

----------------------

********** Normal Estimation started.... :

-input kSearch : 10

-output plane coefficients
0.00457876
-0.186737
-0.982399
-346.195
********** Normal Estimation finished.... :

-input model Sylinder
threshold = 10

-output coeficients : 1087.051636
-output coeficients : -7542.705078
-output coeficients : 1089.206909
-output coeficients : -0.999795
-output coeficients : 0.018364
-output coeficients : -0.008512
-output coeficients : 43.992542                        ->RADIUS
-output nr. points within threshold : 18646

It is obvious tha getFitCylinder  result is wrong.

API code:

Bentley::Ustn::PointCloud::PointCloudDataQueryPtr sel_query = Bentley::Ustn::PointCloud::IPointCloudDataQuery::CreateSelectedPointsQuery (eeh);
sel_query->SetDensity(Bentley::Ustn::PointCloud::IPointCloudDataQuery::QUERY_DENSITY_FULL,(float)1);

double UM = 0; // UORs in Master
mdlCnv_masterToUOR (&UM, 1, MASTERFILE);

double rad;

double rms_=sel_query->GetFitCylinder (axis, basePoint,rad,height, constrainToAxis,constrainToRadius);
rms=rms_;
UM=0;
mdlCnv_UORToMaster (&UM, 1, MASTERFILE);
//axis.x =UM* axis.x;
//axis.y =UM* axis.y;
//axis.z =UM* axis.z;
basePoint=apiDefault::convertPoint_UOR_ToMaster(basePoint);
radius =UM* rad;
height =UM* height;
mdlElmdscr_freeAll (&pElm);

Am I doing something wrong or GetFitCylinder computes bad result?

POD file is attached.

Thanks

Manko