shape.setAsBox(0.5f, 3.0f, new Vec2(-8.0f, 0.0f), 0.0f);
ground.createFixture(shape, 0);
shape.setAsBox(2.0f, 0.1f, new Vec2(-6.0f, -2.8f), 0.1f);
ground.createFixture(shape, 0);
CircleShape cd = new CircleShape();
cd.m_radius = 0.5f;
cd.m_p.set(-0.5f, -4.0f);
ground.createFixture(cd, 0);