To avoid passing of object through ground

HI
var dragControls = new THREE.DragControls( objects, camera,renderer.domElement,groundRaycastObj,interactiveObj);
dragControls.addEventListener( ‘drag’, function ( event )
{

 if(objects[0].position.y <= 50)
 {
 dragControls = false;	
 }
else
 {
  	dragControls.addEventListener( 'dragstart', function ( event ) 
  	{
     controls.enabled=false;
  		
  	});
    dragControls.addEventListener( 'dragend', function ( event )
    {
    controls.enabled=true;
    });
  }

});

please find new code