shape.render(mc);
mc.assertCountsEqual(1, 3, seeThru);
shape.render(mc);
shape.render(mc);
shape.render(mc);
mc.assertCountsEqual(4, 12, 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));