Far Cry 2 Physics Bug Causes NPCs to Bounce Like Crazy - Kotaku
the aspect ratio of the posts determines whether the post array behaves like a superhydrophobic surface or a cassie--wenzel surface. for two posts with similar height and a liquid--air contact angle of θ=150, cassie--wenzel sliding is induced for an array of posts of aspect ratio ac/diac/di>1.36, on the other hand, generates a superhydrophobic surface. we have performed numerical simulations of the drop impact process using a finite-element method to study the detachment dynamics and the effect of liquid--air interface tension, and found that a detachment phenomenon occurring through pancake bouncing is in fact an irreversible inelastic deformation with zero energy dissipation. the detachment time for superhydrophobic surfaces increases with the liquid--air surface tension and the surface--liquid interface tension. this behavior is consistent with the wenzel model. the drop impact energy is converted into a potential energy gain as a result of deformation, so it is transferred into the liquid--air interface. thus, the liquid--air contact area diminishes, and at the same time the deformation of the drop decreases. this drop deformation tends to be exactly balanced by the surface tension, which makes the detachment to occur at a certain point of the compressed state of the drop. the resulting pancake bouncing behaviour seems to originate from the interaction of the liquid--air interface and the deformed contact line. the superhydrophobic surface with nanotextures also shows a transition from the conventional complete rebound to pancake bouncing, but the difference between the two is large. this may be because the nanoflowers prevent a dry contact between the drop and the solid surface, and thus lower the surface energy. once the contact line moves into the nanotexture area, the liquid--air contact area begins to rapidly decrease, making the drop leave the surface in a pancake shape.
far cry 2 npc bouncing