diff --git a/src/lib.rs b/src/lib.rs
index 0beb0aa..7376d38 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -346,16 +346,13 @@ impl Core {
 				hits1 = hits2;
 			}
 		}
-		let mut camera_ray_display: Vec<Vertex> = Vec::with_capacity(camera_rays.len());
-		if args.show_light {
+		let light_at = {
 			let sigma2 = args.accum_sigma.powi(2);
 			let accum_normalizator = (2. * PI * sigma2).sqrt().recip();
-			for ray in camera_rays {
-				let Some(hit) = scene.trace_ray(ray) else {
-					continue;
-				};
+			let hits = &hits;
+			move |hit: Hit| -> f32 {
 				let mut total_cd = 0.0f32;
-				for light_hit in &hits {
+				for light_hit in hits {
 					let d2 = hit.incident.base.distance_squared(light_hit.incident.base);
 					if d2 > 9. * sigma2 {
 						continue;
@@ -368,11 +365,22 @@ impl Core {
 					assert!(hit.incident.dir.is_normalized());
 					let reflector = Lambertian;
 					let in_lm = 1.0;
-					let out_cd = in_lm * reflector.brdf(normal, light_hit.incident.dir, -ray.dir);
+					let out_cd =
+						in_lm * reflector.brdf(normal, light_hit.incident.dir, -hit.incident.dir);
 					let weight = accum_normalizator * (-0.5 * d2 / sigma2).exp();
 					total_cd += weight * out_cd;
 				}
-				let brightness = 3. * (1. - (1. + total_cd * args.accum_scale).recip());
+				total_cd * args.accum_scale
+			}
+		};
+		let mut camera_ray_display: Vec<Vertex> = Vec::with_capacity(camera_rays.len());
+		if args.show_light {
+			for ray in camera_rays {
+				let Some(hit) = scene.trace_ray(ray) else {
+					continue;
+				};
+				let light = light_at(hit);
+				let brightness = 3. * (1. - (1. + light).recip());
 				let r = args.accum_sigma;
 				let color = vec3(brightness, brightness - 1., brightness - 2.)
 					.clamp(Vec3::splat(0.), Vec3::splat(1.));