steel and collider mass

1 files changed, 16 insertions, 8 deletions

diff --git a/src/sim/entity/mod.rs b/src/sim/entity/mod.rs
index 555d2c6..0f4ae3c 100644
--- a/src/sim/entity/mod.rs
+++ b/src/sim/entity/mod.rs
@@ -5,7 +5,7 @@ use rapier2d::{
 };
 
 use crate::{
-    config::CELLS_TO_METRES,
+    config::{CELLS_TO_METRES, MASS_SCALING},
     sim::{
         cell::{cell::Cell, materials::MaterialId},
         lib::marching_squares::Marchable,
@@ -48,16 +48,16 @@ impl Marchable for EntityCells {
 pub trait EntityBehaviour {
     fn update(
         &mut self,
-        update_ctx: &mut EntityUpdateCtx,
-        ctx: &mut SimCtx,
-        delta_time: f32,
+        _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,
+        _update_ctx: &mut EntityUpdateCtx,
+        _ctx: &mut SimCtx,
+        _delta_time: f32,
     ) -> () {
     }
 }
@@ -79,7 +79,15 @@ impl EntityDef {
             .translation(position / CELLS_TO_METRES)
             .build();
 
-        let collider = RbManager::convex_hull_collider_from_marchable(&cells, None).build();
+        let mass = cells
+            .cells
+            .iter()
+            .fold(0, |acc, cur| acc + cur.material.def().density) as f32
+            * MASS_SCALING;
+
+        let collider = RbManager::convex_hull_collider_from_marchable(&cells, None)
+            .mass(mass)
+            .build();
 
         EntityDef {
             rb: Some(rb),