[ ] Hit Particles (Dust, Sparks... depends on combination of collision)
[ ] Lubricated (Wet / Oiled)
Entity and Element Enhancements
[ ] Multi Material
[ ] Entity (one material per body shape)
[ ] Map Element (multi-shape body #61)
Damage and Breaking
[ ] use poof animation for now
Prop Entities
[ ] Sliding Friction
Physics engine needs a tolerance for Friction - up to a certain force can be tolerated without movement before the objects slides or if goes air-born completely flies.
Set friction on preSolve, or create a Ground Friction Joint for Props with a custom applyImpulse
http://www.roymech.co.uk/Useful_Tables/Tribology/co_of_frict.htm
Materials
Material Properties
Entity and Element Enhancements
Damage and Breaking
Prop Entities