Procedural Lines

Procedural lines work. This can be handy because doing non-mesh lines in Blender is not really possible. Also these lines keep the same thickness no matter how far away they are.

API Link

// add your code here, e.g. console.log('Hello, World!');
    var material = new v3d.LineBasicMaterial({
        color: 0x0000ff
    });

    var geometry = new v3d.Geometry();
    geometry.vertices.push(
        new v3d.Vector3( -10, 0, 0 ),
        new v3d.Vector3( 0, 10, 0 ),
        new v3d.Vector3( 10, 0, 0 )
        );

    var line = new v3d.Line( geometry, material );
    //here I had to add v3dApp. otherwise, scene was undefined
    v3dApp.scene.add( line );