From 4380928861c2a43f0d0b9793b9e501c720cf5803 Mon Sep 17 00:00:00 2001
From: Kai Stevenson <kai@kaistevenson.com>
Date: Sat, 22 Aug 2026 17:59:19 -0700
Subject: default impl for behaviour trait

---
 src/sim/entity/entities/entity_grenade.rs |  7 -------
 src/sim/entity/mod.rs                     | 12 +++++++++---
 src/sim/lib/force.rs                      | 10 ++++++++--
 3 files changed, 17 insertions(+), 12 deletions(-)

(limited to 'src/sim')

diff --git a/src/sim/entity/entities/entity_grenade.rs b/src/sim/entity/entities/entity_grenade.rs
index eead416..abc57d9 100644
--- a/src/sim/entity/entities/entity_grenade.rs
+++ b/src/sim/entity/entities/entity_grenade.rs
@@ -11,13 +11,6 @@ struct GrenadeEntityBehaviour {
 }
 
 impl EntityBehaviour for GrenadeEntityBehaviour {
-    fn physics_update(
-        &mut self,
-        _update_ctx: &mut EntityUpdateCtx,
-        _ctx: &mut SimCtx,
-        _delta_time: f32,
-    ) -> () {
-    }
     fn update(
         &mut self,
         update_ctx: &mut EntityUpdateCtx,
diff --git a/src/sim/entity/mod.rs b/src/sim/entity/mod.rs
index c6c350e..555d2c6 100644
--- a/src/sim/entity/mod.rs
+++ b/src/sim/entity/mod.rs
@@ -46,14 +46,20 @@ impl Marchable for EntityCells {
 }
 
 pub trait EntityBehaviour {
-    fn update(&mut self, update_ctx: &mut EntityUpdateCtx, ctx: &mut SimCtx, delta_time: f32)
-    -> ();
+    fn update(
+        &mut self,
+        update_ctx: &mut EntityUpdateCtx,
+        ctx: &mut SimCtx,
+        delta_time: f32,
+    ) -> () {
+    }
     fn physics_update(
         &mut self,
         update_ctx: &mut EntityUpdateCtx,
         ctx: &mut SimCtx,
         delta_time: f32,
-    ) -> ();
+    ) -> () {
+    }
 }
 
 pub struct EntityDef {
diff --git a/src/sim/lib/force.rs b/src/sim/lib/force.rs
index 8acfa15..ff65fef 100644
--- a/src/sim/lib/force.rs
+++ b/src/sim/lib/force.rs
@@ -4,7 +4,7 @@ use rand::random_range;
 use crate::sim::{
     cell::{
         cell::Cell,
-        materials::{MaterialId, fire::FireCellView},
+        materials::{MaterialForm, MaterialId, fire::FireCellView},
     },
     particle_manager::particle::Particle,
     sim_manager::SimCtx,
@@ -52,7 +52,13 @@ pub fn apply_explosion(
                                 1.0,
                             ));
                         }
-                    } else {
+                    } else if [
+                        MaterialForm::Solid,
+                        MaterialForm::Liquid,
+                        MaterialForm::Powder,
+                    ]
+                    .contains(&cell.material.def().form)
+                    {
                         ctx.cell_manager
                             .set_cell_from_game_position(ipos.x, ipos.y, fire, false);
                         if random_range(0.0..1.0) > 0.6 {
-- 
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