diff --git a/src/trap/filters.rs b/src/trap/filters.rs
index f2c780a..313f3d5 100644
--- a/src/trap/filters.rs
+++ b/src/trap/filters.rs
@@ -313,6 +313,14 @@ impl Filter for PincushionFilter {
 
         let projected_positions: Vec<laser::Point> = points.points.iter().map(|point| {
             let p = point.position;
+
+
+            // formula by Ilya Sinenko: https://hackernoon.com/galvo-scanner-pillow-and-barrel-distortions-correction
+            // x_angle = atan(x_cord / (sqrt(pow(d,2)+pow(y_cord,2))+e))
+
+            let x = (p[0] / (p[1].abs() + self.k_x )).atan();
+            return [x, p[1]];
+
             let mut radius = (p[0].powi(2) + p[1].powi(2)).sqrt();
             let new_position = if radius > 0. {
                 let theta = p[1].atan2(p[0]);