Hi SUIYAN, try setting this up on a shortcut key:

script:var curves = moi.geometryDatabase.getSelectedObjects().getCurves(); if ( curves.length == 1 ) { var crv = curves.item(0); var len = crv.getLength(); moi.ui.alert( moi.ui.formatNumber( len ) ); }

That should pop up a message with the length of the selected curve and it should work on V3.

- Michael