diff --git a/experiments/2024-12-09/Cargo.lock b/experiments/2024-12-09/Cargo.lock
index 897d2f3d9..84a59bde2 100644
--- a/experiments/2024-12-09/Cargo.lock
+++ b/experiments/2024-12-09/Cargo.lock
@@ -509,6 +509,7 @@ dependencies = [
  "glyphon",
  "iter_fixed",
  "pollster",
+ "spade",
  "threemf",
  "tuples",
  "wgpu",
@@ -1468,6 +1469,12 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "19b30a45b0cd0bcca8037f3d0dc3421eaf95327a17cad11964fb8179b4fc4832"
 
+[[package]]
+name = "robust"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cbf4a6aa5f6d6888f39e980649f3ad6b666acdce1d78e95b8a2cb076e687ae30"
+
 [[package]]
 name = "roxmltree"
 version = "0.20.0"
@@ -1656,6 +1663,18 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "spade"
+version = "2.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "93f5ef1f863aca7d1d7dda7ccfc36a0a4279bd6d3c375176e5e0712e25cb4889"
+dependencies = [
+ "hashbrown 0.14.5",
+ "num-traits",
+ "robust",
+ "smallvec",
+]
+
 [[package]]
 name = "spirv"
 version = "0.3.0+sdk-1.3.268.0"
diff --git a/experiments/2024-12-09/Cargo.toml b/experiments/2024-12-09/Cargo.toml
index 1132143e3..a8d4ee805 100644
--- a/experiments/2024-12-09/Cargo.toml
+++ b/experiments/2024-12-09/Cargo.toml
@@ -9,6 +9,7 @@ anyhow = "*"
 glyphon = "*"
 iter_fixed = "*"
 pollster = "*"
+spade = "*"
 threemf = "*"
 tuples = "*"
 wgpu = "*"