computeLineDistances() {

		const geometry = this.geometry;

		// we assume non-indexed geometry

		if ( geometry.index === null ) {

			const positionAttribute = geometry.attributes.position;
			const lineDistances = [];

			for ( let i = 0, l = positionAttribute.count; i < l; i += 2 ) {

				_start.fromBufferAttribute( positionAttribute, i );
				_end.fromBufferAttribute( positionAttribute, i + 1 );

				lineDistances[ i ] = ( i === 0 ) ? 0 : lineDistances[ i - 1 ];
				lineDistances[ i + 1 ] = lineDistances[ i ] + _start.distanceTo( _end );

			}

			geometry.setAttribute( 'lineDistance', new Float32BufferAttribute( lineDistances, 1 ) );

		} else {

			console.warn( 'THREE.LineSegments.computeLineDistances(): Computation only possible with non-indexed BufferGeometry.' );

		}

		return this;

	}
This flag can be used for type testing.

@type {boolean}
@readonly
@default true