for ( int i = projector.NbExt(); i > 0; i-- )
if ( projector.SquareDistance( i ) < minVal ) {
minVal = projector.SquareDistance( i );
for ( int i = projector.NbExt(); i > 0; i-- )
if ( projector.SquareDistance( i ) < minVal ) {
minVal = projector.SquareDistance( i );