From 3f7de64e2e8acb6328925c7270391b90ec800208 Mon Sep 17 00:00:00 2001
From: Kai Stevenson <kai@kaistevenson.com>
Date: Thu, 27 Aug 2026 21:17:18 -0700
Subject: naive splashing

---
 src/sim/sim_manager/utils.rs | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

(limited to 'src/sim/sim_manager')

diff --git a/src/sim/sim_manager/utils.rs b/src/sim/sim_manager/utils.rs
index d744ec0..0270cce 100644
--- a/src/sim/sim_manager/utils.rs
+++ b/src/sim/sim_manager/utils.rs
@@ -1,9 +1,10 @@
 use glam::{IVec2, Vec2};
+use rand::random_range;
 use rapier2d::dynamics::RigidBodyBuilder;
 
 use crate::{
     config::MIN_ENTITY_CELLS,
-    content::materials::MaterialId,
+    content::materials::{MaterialForm, MaterialId},
     sim::{
         cell::Cell,
         entity::{EntityCells, EntityDef, EntityId, EntityUpdateResult},
@@ -18,6 +19,7 @@ fn write_entity_to_world(sim: &mut SimManager, entity_id: EntityId) -> Vec<(u8,
     if let Some(entity) = sim.entities.get(&entity_id)
         && let Some(cells) = &entity.data.cells
         && let Some((pos, (cos, sin))) = entity.data._transform(&sim.rb_manager)
+        && let Some(linvel) = entity.data._linvel(&sim.rb_manager)
     {
         let (half_size_x, half_size_y) = ((cells.size.x / 2) as f32, (cells.size.y / 2) as f32);
         // half-extent of the rotated grid's axis-aligned bounding box, plus a cell of margin
@@ -36,7 +38,6 @@ fn write_entity_to_world(sim: &mut SimManager, entity_id: EntityId) -> Vec<(u8,
                 if let Some(cur_world_cell) = sim
                     .cell_manager
                     .get_cell_from_game_position(world_x, world_y)
-                    && cur_world_cell.material == MaterialId::Void
                 {
                     // same as shader
                     let d = (world_x as f32 + 0.5 - pos.x, world_y as f32 + 0.5 - pos.y);
@@ -55,6 +56,19 @@ fn write_entity_to_world(sim: &mut SimManager, entity_id: EntityId) -> Vec<(u8,
                         continue;
                     }
 
+                    if cur_world_cell.material.def().form == MaterialForm::Liquid {
+                        sim.particle_manager.particles.push(Particle::new(
+                            Vec2::new(world_x as f32, world_y as f32),
+                            (-linvel / 2.0)
+                                + Vec2::new(random_range(-25.5..25.5), random_range(3.5..12.5)),
+                            cur_world_cell.material,
+                            3.5,
+                            0.06,
+                        ))
+                    } else if cur_world_cell.material != MaterialId::Void {
+                        continue;
+                    }
+
                     cell.match_parity(sim.cell_manager.seqno);
 
                     // TODO: OPTIMIZE!!
-- 
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