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I notice that this can render ThreeJS objects. Any reason to construct and object with ThreeJS and render it with Two?

No no, you can create shapes and render / extrude them in Three.js. The puzzle piece in this example is a 2D path made in Two.js and then extruded in Three.js: https://jonobr1.github.io/two.js/examples/three-extrusion.ht...