if ( myScalarBarActor->GetLookupTable() ) {
float *range = myScalarBarActor->GetLookupTable()->GetRange();
myMinEdit->setText( QString::number( range[0] ) );
if ( myScalarBarActor->GetLookupTable() ) {
float *range = myScalarBarActor->GetLookupTable()->GetRange();
myMinEdit->setText( QString::number( range[0] ) );