shape.render(mc);
mc.assertCountsEqual(2, 4, seeThru);
shape.render(mc);
shape.render(mc);
shape.render(mc);
mc.assertCountsEqual(8, 16, seeThru);
// Eleven points make ten lines
arr.add(new Vector3(7.0, 15.5, -6.5));
arr.add(new Vector3(7.0, 12.5, -3.5));
arr.add(new Vector3(17.0, 12.5, -3.5));