diff --git a/src/geometry/box-brush-mesh.ts b/src/geometry/box-brush-mesh.ts
index 62e92ba7..b2efc08b 100644
--- a/src/geometry/box-brush-mesh.ts
+++ b/src/geometry/box-brush-mesh.ts
@@ -62,22 +62,6 @@ function cloneVec3(vector: Vec3): Vec3 {
   return { x: vector.x, y: vector.y, z: vector.z };
 }
 
-function subtractVec3(left: Vec3, right: Vec3): Vec3 {
-  return {
-    x: left.x - right.x,
-    y: left.y - right.y,
-    z: left.z - right.z
-  };
-}
-
-function crossVec3(left: Vec3, right: Vec3): Vec3 {
-  return {
-    x: left.y * right.z - left.z * right.y,
-    y: left.z * right.x - left.x * right.z,
-    z: left.x * right.y - left.y * right.x
-  };
-}
-
 function dotVec3(left: Vec3, right: Vec3): number {
   return left.x * right.x + left.y * right.y + left.z * right.z;
 }
diff --git a/src/geometry/box-face-uvs.ts b/src/geometry/box-face-uvs.ts
index 4b467e2e..74955792 100644
--- a/src/geometry/box-face-uvs.ts
+++ b/src/geometry/box-face-uvs.ts
@@ -4,7 +4,12 @@ import type { Vec2, Vec3 } from "../core/vector";
 import { BOX_FACE_IDS, createDefaultFaceUvState, type BoxBrush, type BoxFaceId, type FaceUvState } from "../document/brushes";
 import { getBoxBrushHalfSize } from "./box-brush";
 
-export function getBoxBrushFaceSize(brush: BoxBrush, faceId: BoxFaceId): Vec2 {
+interface BoxBrushUvProjectionSource {
+  size: Vec3;
+  faces: Record<BoxFaceId, { uv: FaceUvState }>;
+}
+
+export function getBoxBrushFaceSize(brush: BoxBrushUvProjectionSource, faceId: BoxFaceId): Vec2 {
   switch (faceId) {
     case "posX":
     case "negX":
@@ -39,7 +44,7 @@ export function createFitToFaceBoxBrushFaceUvState(brush: BoxBrush, faceId: BoxF
   };
 }
 
-export function projectBoxFaceVertexToUv(vertexPosition: Vec3, brush: BoxBrush, faceId: BoxFaceId): Vec2 {
+export function projectBoxFaceVertexToUv(vertexPosition: Vec3, brush: BoxBrushUvProjectionSource, faceId: BoxFaceId): Vec2 {
   const halfSize = getBoxBrushHalfSize(brush);
 
   switch (faceId) {
@@ -113,7 +118,7 @@ export function transformProjectedFaceUv(baseUv: Vec2, faceSize: Vec2, uvState:
   };
 }
 
-export function applyBoxBrushFaceUvsToGeometry(geometry: BoxGeometry, brush: BoxBrush): void {
+export function applyBoxBrushFaceUvsToGeometry(geometry: BoxGeometry, brush: BoxBrushUvProjectionSource): void {
   const positionAttribute = geometry.getAttribute("position");
   const uvAttribute = geometry.getAttribute("uv");
   const indexAttribute = geometry.getIndex();