diff --git a/Cargo.toml b/Cargo.toml
index c06c2b1..8de0f57 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,6 +5,9 @@ edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
+[profile.dev]
+opt-level = 3
+
 [dependencies]
 rand = "0.8.5"
 glm = "0.2.3"
diff --git a/src/main.rs b/src/main.rs
index d77e81d..d745198 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -79,8 +79,8 @@ fn main() -> Result<(), Box<dyn Error>> {
 
 			// perspective projection
 			let off = (img_coords - img_size * 0.5) / img_size.y;
-			let base = vec3(0.0, 0.0, -20.0);
-			let ray = vec3(off.x, off.y, 1.0);
+			let base = vec3(0.0, 0.0, -40.0);
+			let ray = vec3(off.x, off.y, 2.0);
 
 			// orthographic projection
 			// let off = (img_coords - img_size * 0.5) / SCALE;
@@ -94,7 +94,7 @@ fn main() -> Result<(), Box<dyn Error>> {
 			for f in &mesh {
 				let color = clamp(to_ivec3(f.normal * 120.0 + 128.0), ivec3(0, 0, 0), ivec3(255, 255, 255));
 				let fs = (0..3).map(|k| edge_dist(f.vertices[k], f.vertices[(k + 1) % 3], base, ray));
-				if fs.into_iter().all(|f| f > 0.0) {
+				if fs.into_iter().all(|f| f >= 0.0) {
 					let m = Mat3 { c0: f.vertices[1] - f.vertices[0], c1: f.vertices[2] - f.vertices[0], c2: -ray };
 					if let Some(m) = m.inverse() {
 						let rel = m * (base - f.vertices[0]);