I was trying to search the Internet to look for a simple diagram on the concept of the figure of eight “8” motion for an arm swing in a walk cycle. Surprisingly, I was not able to find any!
So I drew a few images to explain the concept of figure of eight “8” in an arm swing and the pros and cons between using IK or FK to animate an arm swing in 3D. Hope it’s useful to some! :)

Animate Arm Swing in 3D FK IK Figure of Eight

Ronald Fong HASS Dean's List AwardsAdmitted to Dean’s List for Academic Year 2013-14.
NTU College of Humanities, Arts and Social Sciences

ADM at HASS Awards CeremonyThanks for coming down to support us! Haha!
From left: Clara Lim, Yeo Shi Yun, Yang Si Shuo, Danial Chong, Ronald Fong, Jasmine Seo, Victor Gui

Ronald Fong HASS Dean's ListThe letter