From 1e0ad48c47f0c4b3c2eadc19d65e20123b931023 Mon Sep 17 00:00:00 2001
From: Kai Stevenson <kai@kaistevenson.com>
Date: Sun, 23 Aug 2026 16:40:46 -0700
Subject: bullet emitter

---
 src/sim/entity/mod.rs | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

(limited to 'src/sim/entity')

diff --git a/src/sim/entity/mod.rs b/src/sim/entity/mod.rs
index 2a046c5..a86a51f 100644
--- a/src/sim/entity/mod.rs
+++ b/src/sim/entity/mod.rs
@@ -49,6 +49,7 @@ impl Marchable for EntityCells {
 }
 
 pub trait EntityBehaviour {
+    // TODO merge ctxs?
     fn update(&mut self, _update_ctx: &mut EntityUpdateCtx, _ctx: &mut SimCtx, _delta_time: f32) {}
     fn physics_update(
         &mut self,
@@ -67,6 +68,23 @@ pub struct EntityDef {
 }
 
 impl EntityDef {
+    pub fn from_cells_and_rb(
+        cells: EntityCells,
+        rb: RigidBody,
+        behaviour: Option<Box<dyn EntityBehaviour>>,
+    ) -> Self {
+        let collider = RbManager::convex_hull_collider_from_marchable(&cells, Some(10))
+            .mass(mass_from_cells(&cells.cells))
+            .build();
+
+        EntityDef {
+            rb: Some(rb),
+            collider: Some(collider),
+            cells: Some(cells),
+            behaviour,
+        }
+    }
+
     pub fn from_cells(
         position: Vec2,
         cells: EntityCells,
-- 
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