dyna3/src/dyna3.litcoffee

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## 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: 0x0000ff} )
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)
```