From 0771c6d09a5409d9bf5230f57781fee21f06f2af Mon Sep 17 00:00:00 2001
From: Willow Sparks <willow.sparks002@gmail.com>
Date: Tue, 3 Feb 2026 21:03:41 +0000
Subject: [PATCH] Add CollisionEvent and CollisionEventKind types

- CollisionEventKind: BodyVsBody, BodyVsStatic, TriggerEnter,
  TriggerStay, TriggerExit
- CollisionEvent wraps kind + contact info
- Exported from rust4d_physics lib
---
 crates/rust4d_physics/src/collision.rs | 25 +++++++++++++++++++++++++
 crates/rust4d_physics/src/lib.rs       |  2 +-
 2 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/crates/rust4d_physics/src/collision.rs b/crates/rust4d_physics/src/collision.rs
index c40d78c..ac9741a 100644
--- a/crates/rust4d_physics/src/collision.rs
+++ b/crates/rust4d_physics/src/collision.rs
@@ -5,6 +5,7 @@
 
 use bitflags::bitflags;
 
+use crate::body::BodyKey;
 use crate::shapes::{Plane4D, Sphere4D, AABB4D};
 use rust4d_math::Vec4;
 
@@ -133,6 +134,30 @@ impl CollisionFilter {
     }
 }
 
+/// What kind of collision event occurred
+#[derive(Clone, Copy, Debug)]
+pub enum CollisionEventKind {
+    /// Two dynamic/kinematic bodies collided
+    BodyVsBody { body_a: BodyKey, body_b: BodyKey },
+    /// A body collided with a static collider
+    BodyVsStatic { body: BodyKey, static_index: usize },
+    /// A body entered a trigger zone
+    TriggerEnter { body: BodyKey, trigger_index: usize },
+    /// A body is staying inside a trigger zone
+    TriggerStay { body: BodyKey, trigger_index: usize },
+    /// A body exited a trigger zone
+    TriggerExit { body: BodyKey, trigger_index: usize },
+}
+
+/// A collision event generated during physics simulation
+#[derive(Clone, Debug)]
+pub struct CollisionEvent {
+    /// What kind of collision this is
+    pub kind: CollisionEventKind,
+    /// Contact information (point, normal, penetration)
+    pub contact: Contact,
+}
+
 /// Contact information from a collision
 #[derive(Clone, Copy, Debug)]
 pub struct Contact {
diff --git a/crates/rust4d_physics/src/lib.rs b/crates/rust4d_physics/src/lib.rs
index 91f06d4..c2a9e1e 100644
--- a/crates/rust4d_physics/src/lib.rs
+++ b/crates/rust4d_physics/src/lib.rs
@@ -15,7 +15,7 @@ pub mod world;
 
 // Re-export commonly used types
 pub use body::{BodyKey, BodyType, RigidBody4D, StaticCollider};
-pub use collision::{aabb_vs_aabb, aabb_vs_plane, sphere_vs_aabb, sphere_vs_plane, sphere_vs_sphere, CollisionFilter, CollisionLayer, Contact};
+pub use collision::{aabb_vs_aabb, aabb_vs_plane, sphere_vs_aabb, sphere_vs_plane, sphere_vs_sphere, CollisionEvent, CollisionEventKind, CollisionFilter, CollisionLayer, Contact};
 pub use material::PhysicsMaterial;
 pub use shapes::{Collider, Plane4D, Sphere4D, AABB4D};
 pub use raycast::{RayHit, ray_vs_sphere, ray_vs_aabb, ray_vs_plane, ray_vs_collider};
-- 
knotmirror 0.0.1