diff --git a/src/bin/flat.rs b/src/bin/flat.rs
index cf94272..a28b6a2 100644
--- a/src/bin/flat.rs
+++ b/src/bin/flat.rs
@@ -463,7 +463,6 @@ struct Rect {
 impl Rect {
 	fn γ(&self) -> f32 { self.external_halflength / self.internal_halflength }
 	fn ri(&self) -> f32 { self.internal_halflength }
-	fn re(&self) -> f32 { self.external_halflength }
 	fn a(&self) -> f32 { (1.0 - self.γ()) / self.ri() }
 	fn b(&self) -> f32 { 2.0 * self.γ() - 1.0 }
 
@@ -679,14 +678,3 @@ mod riemann {
 		assert_eq!(t[1].col(1)[1], 7.0);
 	}
 }
-
-fn smoothstep(x: f32) -> f32 {
-	return 3.0 * x * x - 2.0 * x * x * x;
-}
-
-fn smoothbox(val: f32, range: Vec2, pad: f32) -> f32 {
-	let slope1 = 1.0 + (val - range.x) / pad;
-	let slope2 = 1.0 - (val - range.y) / pad;
-	let lin = slope1.min(slope2);
-	smoothstep(lin.clamp(0.0, 1.0))
-}