Some cleanup

lyra-math/src/transform.rs

@@ -93,6 +93,13 @@ impl Transform {
         trans.z += z;
     }
 
+    /// Combines a transform with another one.
+    /// 
+    /// The translations are added while the rotations and scales are multiplied.
+    pub fn combine(self, rhs: Transform) -> Transform {
+        self + rhs
+    }
+    
     /// Performs a linear interpolation between `self` and `rhs` based on the value `alpha`.
     ///
     /// When `alpha` is `0.0`, the result will be equal to `self`.  When `alpha` is `1.0`, the result

lyra-scene/src/lib.rs

@@ -172,7 +172,7 @@ impl<'a> SceneGraph<'a> {
         self.traverse_down_from(self.root_node.clone(), &mut callback);
     }
 
-    /// Traverses down the SceneGraph from a starting node, calling `callback` with each
+    /// Recursively Traverses down the SceneGraph from a starting node, calling `callback` with each
     /// SceneNode and its world transform.
     fn traverse_down_from<F>(&self, start: SceneNode, callback: &mut F)
     where