Add more transform relative vectors (#1300)

* Add more transform relative vectors (#1298)

* Add inverse of relative directions (#1298)

crates/bevy_transform/src/components/global_transform.rs

@@ -74,11 +74,36 @@ impl GlobalTransform {
         Mat4::from_scale_rotation_translation(self.scale, self.rotation, self.translation)
     }
 
+    #[inline]
+    pub fn right(&self) -> Vec3 {
+        self.rotation * Vec3::unit_x()
+    }
+
+    #[inline]
+    pub fn left(&self) -> Vec3 {
+        -self.right()
+    }
+
+    #[inline]
+    pub fn up(&self) -> Vec3 {
+        self.rotation * Vec3::unit_y()
+    }
+
+    #[inline]
+    pub fn down(&self) -> Vec3 {
+        -self.up()
+    }
+
     #[inline]
     pub fn forward(&self) -> Vec3 {
         self.rotation * Vec3::unit_z()
     }
 
+    #[inline]
+    pub fn backward(&self) -> Vec3 {
+        -self.forward()
+    }
+
     #[inline]
     /// Rotate the transform by the given rotation
     pub fn rotate(&mut self, rotation: Quat) {

crates/bevy_transform/src/components/transform.rs

@@ -74,11 +74,36 @@ impl Transform {
         Mat4::from_scale_rotation_translation(self.scale, self.rotation, self.translation)
     }
 
+    #[inline]
+    pub fn right(&self) -> Vec3 {
+        self.rotation * Vec3::unit_x()
+    }
+
+    #[inline]
+    pub fn left(&self) -> Vec3 {
+        -self.right()
+    }
+
+    #[inline]
+    pub fn up(&self) -> Vec3 {
+        self.rotation * Vec3::unit_y()
+    }
+
+    #[inline]
+    pub fn down(&self) -> Vec3 {
+        -self.up()
+    }
+
     #[inline]
     pub fn forward(&self) -> Vec3 {
         self.rotation * Vec3::unit_z()
     }
 
+    #[inline]
+    pub fn backward(&self) -> Vec3 {
+        -self.forward()
+    }
+
     #[inline]
     /// Rotate the transform by the given rotation
     pub fn rotate(&mut self, rotation: Quat) {