From 51ecf9530dae94341e2ba96453a4bf7e376ad33b Mon Sep 17 00:00:00 2001
From: Kai Stevenson <kai@kaistevenson.com>
Date: Wed, 2 Sep 2026 00:05:29 -0700
Subject: character controller

---
 src/sim/entity/mod.rs     | 41 +++++++++++++++++++++++++++++++++++++++++
 src/sim/rb_manager/mod.rs |  4 ++--
 2 files changed, 43 insertions(+), 2 deletions(-)

(limited to 'src/sim')

diff --git a/src/sim/entity/mod.rs b/src/sim/entity/mod.rs
index 9425f9b..4a8eda4 100644
--- a/src/sim/entity/mod.rs
+++ b/src/sim/entity/mod.rs
@@ -2,6 +2,7 @@ use glam::{IVec2, Vec2};
 use rapier2d::{
     dynamics::{RigidBody, RigidBodyBuilder, RigidBodyHandle},
     geometry::{Collider, ColliderHandle},
+    math::Pose2,
 };
 
 use crate::{
@@ -123,6 +124,46 @@ impl EntityDef {
 
         EntityDef::from_cells(position, entity_cells, behaviour)
     }
+
+    pub fn kinematic_from_cells(
+        position: Vec2,
+        cells: EntityCells,
+        behaviour: Option<Box<dyn EntityBehaviour>>,
+    ) -> Self {
+        let rb = RigidBodyBuilder::kinematic_velocity_based()
+            .translation(position)
+            .build();
+
+        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 kinematic_from_sprite(
+        position: Vec2,
+        path: &str,
+        behaviour: Option<Box<dyn EntityBehaviour>>,
+    ) -> Self {
+        let sprite_cells = load_sprite_to_cells(path);
+        let mut entity_cells = EntityCells {
+            cells: sprite_cells.cells,
+            size: IVec2::new(sprite_cells.width as i32, sprite_cells.height as i32),
+        };
+
+        entity_cells
+            .cells
+            .iter_mut()
+            .for_each(|c| c.set_entity_integrated(true));
+
+        EntityDef::kinematic_from_cells(position, entity_cells, behaviour)
+    }
 }
 
 #[derive(Clone, Copy, PartialEq, Eq, Debug, Hash)]
diff --git a/src/sim/rb_manager/mod.rs b/src/sim/rb_manager/mod.rs
index 2b476d5..1be024a 100644
--- a/src/sim/rb_manager/mod.rs
+++ b/src/sim/rb_manager/mod.rs
@@ -11,7 +11,7 @@ use rapier2d::{
 };
 
 use crate::{
-    config::{CELLS_TO_METRES, CHUNK_SIZE, PHYSICS_DELTA_TIME},
+    config::{CELLS_TO_METRES, CHUNK_SIZE, GRAVITY, PHYSICS_DELTA_TIME},
     sim::{
         cell_manager::chunk::Chunk,
         lib::marching_squares::{Marchable, marching_squares_vertex_trace},
@@ -29,7 +29,7 @@ pub struct PhysicsManager {
 impl PhysicsManager {
     pub fn new() -> Self {
         let mut world = PhysicsWorld::new();
-        let gravity = vec2(0.0, 9.81 * CELLS_TO_METRES);
+        let gravity = vec2(0.0, GRAVITY);
         world.gravity = gravity;
         world.integration_parameters = IntegrationParameters {
             // 20 pixels <-> 1 meter
-- 
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