Type Alias PreSolveHook 

pub type PreSolveHook = Box<dyn Fn(usize, usize, &Contact) -> bool + Send + Sync>;

Pre-solve contact hook callback type

Called before each contact is solved. Return false to skip this contact. This allows game logic to filter contacts (e.g., one-way platforms, character controllers that ignore certain collisions).

Aliased Type

pub struct PreSolveHook(/* private fields */);