https://github.com/mrdoob/three.js/pull/689

More moving ifs out of inner loops.

Also here moved ifs out of the inner loop.

Starts to get hard to measure performance impact - baseline JavaScript stuff just to produce some change gets very costly. Simply calling Math.random() hundreds thousands times causes massive garbage collection :S.

No need for copy of attributes map here, attributes list has the same function.

More moving ifs out of inner loops: gained 25% performance for dynamic meshes with custom attributes.

Hope I didn't break something.

Finally I realized how useful it is and why we kept it around ;).

Moved most of ifs out of inner loops for ~25% performance gain with dynamic meshes. Custom attributes setting for meshes can still be improved more.

This gave us ~13% performance gain for dynamic meshes.

Interestingly, this was breaking OpenGL but not ANGLE.

Actually, this would break cameras added as childs of objects, reverting.
So there is no clear and simple way to handling multiple scenes unfortunatelly.
Encouraging `scene.add( camera )` seems like the right thing to do then, less problems.

Actually, I think this can be handled magically instead of requiring understanding of the concept that the camera is part of the scenegraph.
While I was at it, I fixed it so you can use a camera for rendering different scenes (the renderer will add it and remove from each scene graph)	.

Removed LOD text example. I think LOD example is good enough.
Ubiquity test working again.
Tweaked README to show the new pattern (Scene first thing created).

Fix was trivial, I guess for the moment they can stay.

Hope so ... looks kinda ok, don't have red-blue glasses.

This doesn't handle properly order of updates of LOD vs camera.

Code is a horrible mess but at least it works. Anyways, some day we should revisit GPU accelerated skinning with a proper pipeline.

It's going to be handy for the WebGLRenderer (__webglObjects)

I had to resurrect parts of old code (keeping track of scene graph changes).

Good news: performance is great, new scene graph gains compound with buffers optimizations and non-array materials refactoring. Together we gained about 15% for rotating cubes performance test (pushing max to 2650 cubes at 60 fps).

Still broken with new scene graph: lod, skinning, collisions, AnaglyphWebGLRenderer, ParallaxBarrierWebGLRenderer, multi-canvas circle example.

Also moved `.overdraw` to Material.
Code is much simpler now :)