diff --git a/src/bin/flat/main.rs b/src/bin/flat/main.rs
index c5f4f56..42ff2dc 100644
--- a/src/bin/flat/main.rs
+++ b/src/bin/flat/main.rs
@@ -4,7 +4,7 @@ use flo_canvas::*;
 use flo_draw::*;
 use glam::*;
 
-use crate::ifaces::DebugTraceable;
+use crate::ifaces::{DebugTraceable, Traceable};
 use crate::types::FlatTraceResult;
 use refraction::mathx::MatExt;
 use riemann::{trace_iter, Metric};
@@ -200,6 +200,12 @@ fn draw_cross(gc: &mut Vec<Draw>, pos: Vec2, r: f32) {
 fn draw_ray_2(gc: &mut Vec<Draw>, space: &Space, camera: Location, dir: Vec2) {
 	let pos = vec2(0., 0.);
 	let (hits, path) = space.trace_dbg(camera, Ray { pos, dir });
+	let hits2 = space.trace(camera, Ray { pos, dir });
+	for (a, b) in hits.into_iter().zip(hits2.into_iter()) {
+		assert_eq!(a.id, b.id);
+		assert_eq!(a.pos, b.pos);
+		assert_eq!(a.rel, b.rel);
+	}
 
 	gc.new_path();
 	gc.move_to(pos.x, pos.y);