generate method
Implementation
@override
Widget generate(Context context) {
var builds = <Widget>[];
if (left) builds.add(build(Location.rel(x: rel, y: 0, z: 0)));
if (right) builds.add(build(Location.rel(x: -rel, y: 0, z: 0)));
if (top) builds.add(build(Location.rel(x: 0, y: rel, z: 0)));
if (bottom) builds.add(build(Location.rel(x: 0, y: -rel, z: 0)));
if (front) builds.add(build(Location.rel(x: 0, y: 0, z: rel)));
if (back) builds.add(build(Location.rel(x: 0, y: 0, z: -rel)));
return For.of(builds);
}