Venkatesh Rao@vgr·Sep 14, 2016@gravity_levity help?Quote TweetVenkatesh Rao@vgr·Sep 14, 2016Q: If I have a surface with grain (anisotropic) what's functional form of coeff of friction? See sketch. ~=Ellipse?1
Brian Skinner@gravity_levity·Sep 15, 2016Replying to @vgrI can't say I've seen this before (you may be surprised to learn that friction is not really understood theoretically).21
Brian Skinner@gravity_levity·Sep 15, 2016Replying to @gravity_levity and @vgrBut I would guess than an ellipse is as likely a parameterization as anything.11
Venkatesh Rao@vgrReplying to @gravity_levitytrying to model "flow like water" and "fight enemy not terrain" as 2 interacting vec fields: local friction+goal direction12:08 AM · Sep 15, 2016
Brian Skinner@gravity_levity·Sep 15, 2016Replying to @vgrEllipses are probably good. But it depends whether you want force prop. to v (as w/ conductivity) or F prop to accel. (as w/ friction)