diff --git a/engine/physics/src/minimum_difference.rs b/engine/physics/src/minimum_difference.rs
index d0bb56db..7476129d 100644
--- a/engine/physics/src/minimum_difference.rs
+++ b/engine/physics/src/minimum_difference.rs
@@ -107,13 +107,13 @@ const fn choose_any_direction()->Planar64Vec3{
 }
 
 fn reduce1(
-	simplex:Simplex<1>,
+	[v0]:Simplex<1>,
 	mesh:&MinkowskiMesh,
 	point:Planar64Vec3,
 )->(Planar64Vec3,Simplex1_3){
 	// --debug.profilebegin("reduceSimplex0")
 	// local a = a1 - a0
-	let p0=mesh.vert(simplex[0]);
+	let p0=mesh.vert(v0);
 
 	// local p = -a
 	let p=-(p0+point);
@@ -128,7 +128,7 @@ fn reduce1(
 	}
 
 	// return direction, a0, a1
-	(direction,Simplex1_3::Simplex1(simplex))
+	(direction,Simplex1_3::Simplex1([v0]))
 }
 
 enum Reduce{