From f177cc716c5f2aa5b50b14ccbb421de89e3a7854 Mon Sep 17 00:00:00 2001
From: Kai Stevenson <kai@kaistevenson.com>
Date: Sun, 16 Aug 2026 17:29:42 -0700
Subject: wip

---
 src/sim/cell/materials/sand.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)
 create mode 100644 src/sim/cell/materials/sand.rs

(limited to 'src/sim/cell/materials/sand.rs')

diff --git a/src/sim/cell/materials/sand.rs b/src/sim/cell/materials/sand.rs
new file mode 100644
index 0000000..d2d1265
--- /dev/null
+++ b/src/sim/cell/materials/sand.rs
@@ -0,0 +1,10 @@
+use crate::sim::cell_sim::sim::UpdateCtx;
+
+#[inline]
+pub fn sim_update(ctx: &mut UpdateCtx) {
+    ctx.candidates_swap(&[
+        (0, 1),
+        (-1 + 2 * ctx.seqno_parity as i32, 1),
+        (1 - 2 * ctx.seqno_parity as i32, 1),
+    ]);
+}
-- 
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