diff --git a/src/materials/rgb_sampled_bsdf_material.rs b/src/materials/rgb_sampled_bsdf_material.rs
index 2d56024..ff37e07 100644
--- a/src/materials/rgb_sampled_bsdf_material.rs
+++ b/src/materials/rgb_sampled_bsdf_material.rs
@@ -83,97 +83,3 @@ impl<'a, T: Real> Material<T> for RgbSampledBsdfMaterial<T> {
         vec![Vector3::new(-w_o.x, -w_o.y, w_o.z)]
     }
 }
-
-fn find_before_and_after<'a, T: Real, C>(
-    value: T,
-    vec: &'a Vec<(T, C)>,
-) -> (&'a (T, C), &'a (T, C)) {
-    let first = vec.first().unwrap();
-    let (lowest, _) = first;
-    if value < *lowest {
-        (first, first)
-    } else {
-        vec.iter()
-            .zip(vec.iter().skip(1))
-            .find(|((value1, _), (value2, _))| value1 <= &value && value2 > &value)
-            .unwrap_or((vec.last().unwrap(), vec.last().unwrap()))
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    mod find_before_and_after {
-        use super::*;
-
-        #[test]
-        fn returns_element_before_value() {
-            let test_data = vec![(10.0, 1), (15.0, 2), (20.0, 3), (25.0, 4), (30.0, 5)];
-            let ((low_first, low_second), (_, _)) = find_before_and_after(23.0, &test_data);
-            assert!(*low_first == 20.0);
-            assert!(*low_second == 3);
-        }
-
-        #[test]
-        fn returns_element_after_value() {
-            let test_data = vec![(10.0, 1), (15.0, 2), (20.0, 3), (25.0, 4), (30.0, 5)];
-            let ((_, _), (high_first, high_second)) = find_before_and_after(23.0, &test_data);
-            assert!(*high_first == 25.0);
-            assert!(*high_second == 4);
-        }
-
-        #[test]
-        fn returns_element_equal_to_value_in_first_position() {
-            let test_data = vec![(10.0, 1), (15.0, 2), (20.0, 3), (25.0, 4), (30.0, 5)];
-            let ((low_first, low_second), (high_first, high_second)) =
-                find_before_and_after(20.0, &test_data);
-            assert!(*low_first == 20.0);
-            assert!(*low_second == 3);
-        }
-
-        #[test]
-        fn returns_first_element_twice_when_value_less_than_first() {
-            let test_data = vec![(10.0, 1), (15.0, 2), (20.0, 3), (25.0, 4), (30.0, 5)];
-            let ((low_first, low_second), (high_first, high_second)) =
-                find_before_and_after(5.0, &test_data);
-            assert!(*low_first == 10.0);
-            assert!(*low_second == 1);
-            assert!(high_first == low_first);
-            assert!(high_second == high_second);
-        }
-
-        #[test]
-        fn returns_last_element_twice_when_value_greater_than_last() {
-            let test_data = vec![(10.0, 1), (15.0, 2), (20.0, 3), (25.0, 4), (30.0, 5)];
-            let ((low_first, low_second), (high_first, high_second)) =
-                find_before_and_after(35.0, &test_data);
-            assert!(*low_first == 30.0);
-            assert!(*low_second == 5);
-            assert!(high_first == low_first);
-            assert!(high_second == high_second);
-        }
-
-        #[test]
-        fn returns_first_two_elements_when_value_is_between_them() {
-            let test_data = vec![(10.0, 1), (15.0, 2), (20.0, 3), (25.0, 4), (30.0, 5)];
-            let ((low_first, low_second), (high_first, high_second)) =
-                find_before_and_after(12.0, &test_data);
-            assert!(*low_first == 10.0);
-            assert!(*low_second == 1);
-            assert!(*high_first == 15.0);
-            assert!(*high_second == 2);
-        }
-
-        #[test]
-        fn returns_last_two_elements_when_value_is_between_them() {
-            let test_data = vec![(10.0, 1), (15.0, 2), (20.0, 3), (25.0, 4), (30.0, 5)];
-            let ((low_first, low_second), (high_first, high_second)) =
-                find_before_and_after(27.0, &test_data);
-            assert!(*low_first == 25.0);
-            assert!(*low_second == 4);
-            assert!(*high_first == 30.0);
-            assert!(*high_second == 5);
-        }
-    }
-}