diff --git a/lib/localisation/preprocessing/src/preprocess_optical.rs b/lib/localisation/preprocessing/src/preprocess_optical.rs
index f7d8f6b..d544508 100644
--- a/lib/localisation/preprocessing/src/preprocess_optical.rs
+++ b/lib/localisation/preprocessing/src/preprocess_optical.rs
@@ -1,5 +1,25 @@
-pub fn process_optical(){
 
-    println!("hello!");
+//TODO: Implement properly!
+fn main() {
+    let raw_optical_data = vec![vec1[1.0, 2.0], vec![3.0, 4.0], vec![5.0, 6.0]];
+    let optical_data = process_optical(&raw_optical_data);
+    println!("{:?}", optical_data);
+}
+
+pub fn process_optical(raw_optical_data: &Vec<f64>) -> Vec<f64> {
+
+    let mut optical_data = Vec::with_capacity(raw_optical_data.len());
+
+    for i in 0..raw_optical_data.len() {
+
+        let mut magnitude = 0.0;
+
+        for j in 0..raw_optical_data[i].len() {
+            magnitude += raw_optical_data[i][j].powi(2);
+        }
+
+    }
+
+    optical_data
 
 }
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