1 files changed, 13 insertions, 1 deletions
diff --git a/src/core/vector3.rs b/src/core/vector3.rs
index 6f4d6ab..10de647 100644
--- a/src/core/vector3.rs
+++ b/src/core/vector3.rs
@@ -2,7 +2,7 @@
 //!
 //! Also add more 3d math things needed for shading and 3d calculations.
 use crate::{Float, Number};
-use std::ops::{Mul, Sub, Add, DivAssign};
+use std::ops::{Mul, Sub, Add, DivAssign, Neg};
 use std::fmt;
 
 #[derive(Clone, Copy)]
@@ -61,6 +61,18 @@ impl<T: Number> Mul<T> for Vector3<T> {
     }
 }
 
+impl<T: Number> Neg for Vector3<T> {
+    type Output = Self;
+
+    fn neg(self) -> Self::Output {
+        Self::Output::new_xyz(
+            -self.x,
+            -self.y,
+            -self.z,
+            )
+    }
+}
+
 impl<T: Number> DivAssign<T> for Vector3<T> {
     fn div_assign(&mut self, op: T) {
         self.x /= op;