3D collision DETECTION concepts:

old school:

    brute-force  ---> O(n^2) complexity!
    Raycasting (used in DOOM)
      introduction: http://permadi.com/1996/05/ray-casting-tutorial-1/
      http://threejs.org/docs/#Reference/Core/Raycaster
      http://spirare.js.org/app/examples/basic-collision-detection/index.html
        code: http://spirare.js.org/app/examples/basic-collision-detection/js/main.js
	    http://webmaestro.fr/collisions-detection-three-js-raycasting/
	    http://oos.moxiecode.com/js_webgl/ray_collision/index.html

modern:

  1) broadphase methods:

    sweep and prune
      naive (brute-force)
      incremental

    octree (3D)
      https://www.youtube.com/watch?v=S-SnhregzOI
      https://en.wikipedia.org/wiki/Octree
        http://www.gamedev.net/page/resources/_/technical/game-programming/introduction-to-octrees-r3529
      https://en.wikipedia.org/wiki/Quadtree (2D)

    uniform grid
      http://gamedev.stackexchange.com/questions/72030/using-uniform-grids-for-collision-detection-efficient-way-to-keep-track-of-wha

    k-d-tree
      https://www.youtube.com/watch?v=HCdHG_J477A
      https://www.youtube.com/watch?v=T9h2KKJ_Pl8
      https://en.wikipedia.org/wiki/K-d_tree

    sphere-tree
      https://www.cs.tcd.ie/publications/tech-reports/reports.99/TCD-CS-1999-10.pdf
      https://www.youtube.com/watch?v=UNdHaahy8P0
    ...

  2) midphase (more precise form of broadphase)
    ...

  3) narrowphase

    3a) AABB (axis-aligned bounding boxes)

      https://developer.mozilla.org/en-US/docs/Games/Techniques/2D_collision_detection
      https://hacks.mozilla.org/2015/10/html-5-games-3d-collision-detection/
      https://developer.mozilla.org/en-US/docs/Games/Techniques/3D_collision_detection
      https://developer.mozilla.org/en-US/docs/Games/Techniques/3D_collision_detection/Bounding_volume_collision_detection_with_THREE.js

      http://threejs.org/docs/#Reference/Math/Box3
        http://threejs.org/docs/#Reference/Extras.Helpers/BoundingBoxHelper
          https://www.script-tutorials.com/webgl-with-three-js-lesson-3/
          https://github.com/jwill/net-magazine-three-js

      https://www.youtube.com/watch?v=8b_reDI7iPM
      https://www.youtube.com/watch?v=Iu6nAXFm2Wo
      https://www.youtube.com/watch?v=NUJeuNwbqs8 (AABB and Bounding-Sphere)

    3b) OBB (oriented bounding box):
      https://en.wikipedia.org/wiki/Minimum_bounding_box
      SAT (Separating Axis Theorem) "used to check for collisions between two simple polygons,
        http://www.jkh.me/files/tutorials/Separating%20Axis%20Theorem%20for%20Oriented%20Bounding%20Boxes.pdf
        http://gamedev.stackexchange.com/questions/25397/obb-vs-obb-collision-detection
        https://github.com/Mugen87/yume/blob/master/src/javascript/engine/etc/OBB.js
        or between a polygon and a circle":
          http://www.wildbunny.co.uk/blog/2011/04/20/collision-detection-for-dummies/

    3c) Bounding Spheres

  --------------------------------

challenges:
  1) mini game based on AABB collision detection
  2) mini game based on Sweep and Prune with AABB collision detection

  --------------------------------

  various info:
    broadphase method selection: http://stackoverflow.com/questions/1616448/broad-phase-collision-detection-methods
    http://www.gamasutra.com/view/feature/131598/advanced_collision_detection_.php?print=1

modern collision RESPONSE:
  [todo]

  --------------------------------

    http://www.bulletphysics.org/mediawiki-1.5.8/index.php?title=Broadphase
    http://buildnewgames.com/broad-phase-collision-detection/
    https://www.youtube.com/watch?v=0ZiFzkp8ZNM

    template: http://jsfiddle.net/95t964o0/

    platform game:
      http://www.webspaceinvader.com/platform/
      http://www.webdesignermag.co.uk/build-a-3d-platform-game-with-three-js-pt-2/

    data visualization:
       http://makc.github.io/three.js/map2globe/demo.html

Physics engine:

  WebGL based physics engines:
  Bullet -> Ammo.js -> Ammo.lab
	  https://github.com/kripken/ammo.js/
    https://github.com/lo-th/Ammo.lab
    demo: http://lo-th.github.io/Ammo.lab/#basic
    https://gildas-lormeau.github.io/zip.js/
  Cannon.js
  GooJS
  Oimo
  PhysicsJS
  ...