shape.set(new Vec2(-20.0f, -20.0f), new Vec2(-20.0f, 20.0f));
ground.createFixture(sd);
// Right vertical
shape.set(new Vec2(20.0f, -20.0f), new Vec2(20.0f, 20.0f));
ground.createFixture(sd);
// Top horizontal
shape.set(new Vec2(-20.0f, 20.0f), new Vec2(20.0f, 20.0f));
ground.createFixture(sd);