* animation blend tree - http://www.chemical-games.com/?page_id=2201
 * blend tree evaluation - http://www.chemical-games.com/wp-content/uploads/2012/05/blend_tree_evaluation.pdf
 * multithreading - https://software.intel.com/en-us/articles/multithreading-the-rendering-pipeline-for-3d-model-animation
 * unreal - https://docs.unrealengine.com/latest/INT/Engine/Animation/AnimationBlending/index.html
 * blending for skinned mesh - http://www.gamedev.net/page/resources/_/technical/graphics-programming-and-theory/a-blending-animation-controller-for-a-skinned-mesh-r3592
 * ozz-animation - https://code.google.com/p/ozz-animation
 * batching - http://www.gamedev.net/topic/663061-is-it-possible-to-do-batch-rendering-with-3d-skeletal-animation-data/

== Stack Exchange ==
 * http://gamedev.stackexchange.com/questions/57645/desire-advice-on-implementing-this-animation-timeline-system\ 
 * data driven animation states - http://gamedev.stackexchange.com/questions/27079/data-driven-animation-states