* 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

== 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