An example that we made for a talk at Nordic Game Indie Night: http://www.youtube.com/watch?v=Fy0aCDmgnxg
You can try the game here: http://grapefrukt.com/f/games/juicy-breakout/
A juicy game feels alive and responds to everything you do tons of cascading action and response for minimal user input.
Emily Short - Make it juicy! http://emshort.wordpress.com/2008/05/24/make-it-juicy/
Casey Muratori - Interpolation http://mollyrocket.com/casey/stream_0018.html
12 Principles of Animation http://minyos.its.rmit.edu.au/aim/a_notes/anim_principles.html
The Art of Diablo 3 http://gdcvault.com/play/1015306/The-Art-of-Diablo
Easing related: https://www.evernote.com/shard/s1/note/c1b7f010-4564-46d9-a8c2-083d8e014b93/c... http://blogs.msdn.com/b/shawnhar/archive/2007/05/03/transitions-part-one-the-... http://www.timotheegroleau.com/Flash/experiments/easing_function_generator.htm
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