1 files changed, 25 insertions, 0 deletions
diff --git a/src/sim/rb_sim/mod.rs b/src/sim/rb_sim/mod.rs
index 48e4282..0192555 100644
--- a/src/sim/rb_sim/mod.rs
+++ b/src/sim/rb_sim/mod.rs
@@ -2,6 +2,7 @@ pub mod debug_render;
 pub mod rb_entity;
 
 use fxhash::FxHashMap;
+use glam::Vec2;
 use rapier2d::{
     dynamics::{self},
     geometry,
@@ -13,6 +14,8 @@ use crate::{
     config::{CELLS_IN_CHUNK, CHUNK_SIZE, PHYSICS_DELTA_TIME, PIXELS_TO_METRES},
     sim::{
         cell::{cell::Cell, materials::MaterialId},
+        cell_sim::chunk::Chunk,
+        lib::marching_squares::marching_squares_vertex_trace,
         rb_sim::{
             debug_render::{DebugLineBuffer, DebugVertex},
             rb_entity::RbEntity,
@@ -161,6 +164,28 @@ impl RbSimManager {
         }
     }
 
+    fn collider_from_chunk(&self, position: Vec2, chunk: &Chunk) -> geometry::Collider {
+        let mut paths = marching_squares_vertex_trace(chunk, CHUNK_SIZE, CHUNK_SIZE);
+        let mut path: Vec<Vec2> = paths
+            // NAIVE, using the second and assuming it's the outer path
+            .swap_remove(0)
+            .iter()
+            .map(|v| v / PIXELS_TO_METRES)
+            .collect();
+        // close the loop
+        let first = (*path.first().unwrap()).clone();
+        path.push(first);
+
+        geometry::ColliderBuilder::polyline(path, None)
+            .translation(position / PIXELS_TO_METRES)
+            .build()
+    }
+
+    pub fn test_add_collider_from_chunk(&mut self, position: Vec2, chunk: &Chunk) {
+        let collider = self.collider_from_chunk(position, chunk);
+        self.physics_manager.collider_set.insert(collider);
+    }
+
     pub fn test(&mut self) {
         /* Create the ground. */
         let collider =