dyna3/src/dyna3.litcoffee

## A Brief Tour of dyna3

When you load dyna3, you should initially see a three-dimensional coordinate system with labeled axes.
```javascript

    import {threeLoaded, three as J3} from './externals.js'

    main = () ->
        renderer = new J3.WebGLRenderer()
        rwd = window.innerWidth
        rht = window.innerHeight
        renderer.setSize(rwd, rht)
        document.body.appendChild renderer.domElement

        scene = new J3.Scene()
        geometry = new J3.SphereBufferGeometry(1, 5, 5)
        material = new J3.MeshBasicMaterial {color: 0xff00ff}
        ball = new J3.Mesh(geometry, material)
        scene.add ball

        camera = new J3.PerspectiveCamera(75, rwd/rht, 0.1, 1000)
        camera.position.z = 5

        renderer.render(scene, camera)

    threeLoaded.then(main)
```