s = new Ammo.btVector3( 0, 1, 0 );
				hinge = new Ammo.btHingeConstraint( pylon.userData.physicsBody, arm.userData.physicsBody, pivotA, pivotB, axis, axis, true );
				physicsWorld.addConstraint( hinge, true );

			}

			function createParalellepiped( sx, sy, sz, mass, pos, quat, material ) {

				const threeObject = new THREE.Mesh( new THREE.BoxGeometry( sx, sy, sz, 1, 1, 1 ), material );
				const shape = new Ammo.btBoxShape( new Ammo.btVector3( sx * 0.5, sy * 0.5, sz * 0.5 ) );
				shape.setMargin( marg