demo.coffee

THREE.Mesh.prototype.rotateAboutObjectAxis = (axis, radians) ->
  rotationMatrix = new THREE.Matrix4()
  rotationMatrix.makeRotationAxis axis.normalize(), radians
  @matrix.multiplySelf rotationMatrix
  @rotation.getRotationFromMatrix @matrix

THREE.Mesh.prototype.rotateAboutWorldAxis = (axis, radians) ->
  rotationMatrix = new THREE.Matrix4()
  rotationMatrix.makeRotationAxis axis.normalize(), radians
  rotationMatrix.multiplySelf @matrix
  @matrix = rotationMatrix
  @rotation.getRotationFromMatrix @matrix

THREE.AxisX = new THREE.Vector3(1, 0, 0)
THREE.AxisY = new THREE.Vector3(0, 1, 0)
THREE.AxisZ = new THREE.Vector3(0, 0, 1)

class Controller
  VIEW_ANGLE = 45
  NEAR = 1
  FAR = 1000
  CAMERA_Z = 1000

  models: [
    'turret.js'
    'turret_base.js',
  ]

  constructor: ->
    @setupRenderer()
    @setupScene()
    @load()

  width: ->
    window.innerWidth

  height: ->
    window.innerHeight

  setupRenderer: ->
    @renderer = new THREE.WebGLRenderer {
      antialias: true # smoother output
    }

    # clear to black background
    @renderer.setClearColorHex 0x080808, 1
    @renderer.setSize @width(), @height()

    @container = document.createElement 'div'
    document.body.appendChild @container
    @container.appendChild @renderer.domElement

    if window.Stats
      @stats = new Stats()
      @stats.domElement.style.position = 'absolute'
      @stats.domElement.style.top = '0px'
      @container.appendChild @stats.domElement

  setupScene: ->
    @scene = new THREE.Scene()

    # add a camera
    @camera = new THREE.PerspectiveCamera VIEW_ANGLE, @width() / @height(), NEAR, FAR
    @camera.position.set 0, 0, CAMERA_Z
    @scene.add @camera

    # add light sources
    @scene.add new THREE.AmbientLight 0x999999
    @light = new THREE.PointLight 0xffffff
    @scene.add @light

  screen_range: (depth) ->
    range_x = Math.tan(@camera.fov * Math.PI / 180) * (@camera.position.z - depth) * 2
    range_y = range_x / @camera.aspect
    [range_x, range_y]

  camera_x_min: (range_x) ->
    @camera.position.x - (range_x) / 2

  camera_x_max: (range_x) ->
    @camera.position.x + (range_x) / 2

  camera_y_min: (range_y) ->
    @camera.position.y - (range_y) / 2

  camera_y_max: (range_y) ->
    @camera.position.y + (range_y) / 2

  load: ->
    @geometries = {}
    loader = new THREE.JSONLoader()
    for model in @models
      @loadModel loader, model

  loadModel: (loader, model) ->
    loader.load model, (geometry) =>
      geometry.computeVertexNormals()
      @geometries[model] = geometry
      if _.size(@geometries) == _.size(@models)
        @continueLoad()

  continueLoad: ->
    @objects = for i in [0..100]
      new Turret {
        controller: this
      }
    @render()

  render: =>
    requestAnimationFrame (=> @render())

    for object in @objects
      object.step()

    @light.position.set @camera.position.x, @camera.position.y, CAMERA_Z * 10
    @renderer.render @scene, @camera

    @stats.update() if @stats

class TurretBase
  constructor: (options) ->
    @controller = options.controller

    @mesh = @buildMesh()
    @mesh.position = new THREE.Vector3 options.position.x, options.position.y, 500
    @controller.scene.add @mesh

  buildMesh: ->
    material = new THREE.MeshFaceMaterial
    geometry = @controller.geometries['turret_base.js']
    for material in geometry.materials
      material.shading = THREE.FlatShading
    new THREE.Mesh geometry, material

class Turret
  rotationalVelocity: Math.PI / 64

  constructor: (options) ->
    @controller = options.controller

    @mesh = @buildMesh()
    @mesh.rotateAboutWorldAxis THREE.AxisZ, 0.001 # hack to fix a bug in ThreeJS?
    @controller.scene.add @mesh

    @position = @mesh.position = new THREE.Vector3 0, 0, 500
    @rotation = 0

    @position.x = (Math.random() * 500) - 250
    @position.y = (Math.random() * 500) - 250

    @base = new TurretBase {
      controller: options.controller,
      position: @position
    }

  buildMesh: ->
    material = new THREE.MeshFaceMaterial
    geometry = @controller.geometries['turret.js']
    for material in geometry.materials
      material.shading = THREE.FlatShading
    new THREE.Mesh geometry, material

  step: ->
    if Math.abs(@rotationalVelocity) > 0
      @mesh.rotateAboutWorldAxis(THREE.AxisZ, @rotationalVelocity)
      @rotation = (@rotation + @rotationalVelocity) % (Math.PI * 2)

$ ->
  new Controller

index.html

<!DOCTYPE html>
<html>
<head>
  <meta http-equiv="content-type" content="text/html;charset=UTF-8" />
  <title>88etag</title>
  <script src="http://cdnjs.cloudflare.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
  <script src="http://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.3.3/underscore-min.js"></script>
  <script src="http://cdnjs.cloudflare.com/ajax/libs/three.js/r49/Three.js"></script>
  <script src="https://raw.github.com/mrdoob/stats.js/master/src/Stats.js"></script>
  <script src="http://cdnjs.cloudflare.com/ajax/libs/coffee-script/1.3.1/coffee-script.min.js"></script>
  <script src="demo.coffee" type="text/coffeescript">
  <style>
    body {
      margin: 0px;
      overflow: hidden;
    }
  </style>
</head>
<body>
  <div id="container"></div>
</body>
</html>

turret.js

{

    "metadata" :
    {
        "formatVersion" : 3,
        "generatedBy"   : "Blender 2.60 Exporter",
        "vertices"      : 224,
        "faces"         : 200,
        "normals"       : 86,
        "colors"        : 0,
        "uvs"           : 0,
        "materials"     : 1,
        "morphTargets"  : 0
    },

    "scale" : 1.000000,

    "materials": [	{
	"DbgColor" : 15658734,
	"DbgIndex" : 0,
	"DbgName" : "Material.001",
	"colorAmbient" : [0.0, 0.0, 0.0],
	"colorDiffuse" : [0.5300403237342834, 0.6503549814224243, 0.699999988079071],
	"colorSpecular" : [0.6574147765526561, 0.8066423142845807, 0.86821762407574],
	"shading" : "Lambert",
	"specularCoef" : 50,
	"transparency" : 1.0,
	"vertexColors" : false
	},

	{
	"DbgColor" : 15597568,
	"DbgIndex" : 1,
	"DbgName" : "Material.001",
	"colorAmbient" : [0.0, 0.0, 0.0],
	"colorDiffuse" : [0.5300403237342834, 0.6503549814224243, 0.699999988079071],
	"colorSpecular" : [0.6574147765526561, 0.8066423142845807, 0.86821762407574],
	"shading" : "Lambert",
	"specularCoef" : 50,
	"transparency" : 1.0,
	"vertexColors" : false
	},

	{
	"DbgColor" : 15597568,
	"DbgIndex" : 1,
	"DbgName" : "Material.001",
	"colorAmbient" : [0.0, 0.0, 0.0],
	"colorDiffuse" : [0.5300403237342834, 0.6503549814224243, 0.699999988079071],
	"colorSpecular" : [0.6574147765526561, 0.8066423142845807, 0.86821762407574],
	"shading" : "Lambert",
	"specularCoef" : 50,
	"transparency" : 1.0,
	"vertexColors" : false
	},

	{
	"DbgColor" : 15597568,
	"DbgIndex" : 1,
	"DbgName" : "Material.001",
	"colorAmbient" : [0.0, 0.0, 0.0],
	"colorDiffuse" : [0.5300403237342834, 0.6503549814224243, 0.699999988079071],
	"colorSpecular" : [0.6574147765526561, 0.8066423142845807, 0.86821762407574],
	"shading" : "Lambert",
	"specularCoef" : 50,
	"transparency" : 1.0,
	"vertexColors" : false
	},

	{
	"DbgColor" : 15597568,
	"DbgIndex" : 1,
	"DbgName" : "Material.001",
	"colorAmbient" : [0.0, 0.0, 0.0],
	"colorDiffuse" : [0.5300403237342834, 0.6503549814224243, 0.699999988079071],
	"colorSpecular" : [0.6574147765526561, 0.8066423142845807, 0.86821762407574],
	"shading" : "Lambert",
	"specularCoef" : 50,
	"transparency" : 1.0,
	"vertexColors" : false
	},

	{
	"DbgColor" : 15597568,
	"DbgIndex" : 1,
	"DbgName" : "Material.001",
	"colorAmbient" : [0.0, 0.0, 0.0],
	"colorDiffuse" : [0.5300403237342834, 0.6503549814224243, 0.699999988079071],
	"colorSpecular" : [0.6574147765526561, 0.8066423142845807, 0.86821762407574],
	"shading" : "Lambert",
	"specularCoef" : 50,
	"transparency" : 1.0,
	"vertexColors" : false
	},

	{
	"DbgColor" : 15597568,
	"DbgIndex" : 1,
	"DbgName" : "Material.001",
	"colorAmbient" : [0.0, 0.0, 0.0],
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	"colorSpecular" : [0.6574147765526561, 0.8066423142845807, 0.86821762407574],
	"shading" : "Lambert",
	"specularCoef" : 50,
	"transparency" : 1.0,
	"vertexColors" : false
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    "vertices": 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