Retain new_observer_frame as a deprecated wrapper function

src/base/cg.rs

@@ -134,6 +134,12 @@ impl<N: Real> Matrix4<N> {
         IsometryMatrix3::face_towards(eye, target, up).to_homogeneous()
     }
 
+    /// Deprecated: Use [Matrix4::face_towards] instead.
+    #[deprecated(note="renamed to `face_towards`")]
+    pub fn new_observer_frame(eye: &Point3<N>, target: &Point3<N>, up: &Vector3<N>) -> Self {
+        Matrix4::face_towards(eye, target, up)
+    }
+
     /// Builds a right-handed look-at view matrix.
     #[inline]
     pub fn look_at_rh(eye: &Point3<N>, target: &Point3<N>, up: &Vector3<N>) -> Self {

src/geometry/isometry_construction.rs

@@ -233,6 +233,15 @@ macro_rules! isometry_construction_impl(
                     $RotId::face_towards(&(target - eye), up))
             }
 
+            /// Deprecated: Use [Isometry::face_towards] instead.
+            #[deprecated(note="renamed to `face_towards`")]
+            pub fn new_observer_frame(eye:    &Point3<N>,
+                                      target: &Point3<N>,
+                                      up:     &Vector3<N>)
+                                      -> Self {
+                Self::face_towards(eye, target, up)
+            }
+
             /// Builds a right-handed look-at view matrix.
             ///
             /// It maps the view direction `target - eye` to the **negative** `z` axis to and the `eye` to the origin.

src/geometry/quaternion_construction.rs

@@ -464,6 +464,16 @@ impl<N: Real> UnitQuaternion<N> {
         Self::from_rotation_matrix(&Rotation::<N, U3>::face_towards(dir, up))
     }
 
+    /// Deprecated: Use [UnitQuaternion::face_towards] instead.
+    #[deprecated(note="renamed to `face_towards`")]
+    pub fn new_observer_frames<SB, SC>(dir: &Vector<N, U3, SB>, up: &Vector<N, U3, SC>) -> Self
+    where
+        SB: Storage<N, U3>,
+        SC: Storage<N, U3>,
+    {
+        Self::face_towards(dir, up)
+    }
+
     /// Builds a right-handed look-at view matrix without translation.
     ///
     /// It maps the view direction `dir` to the **negative** `z` axis.

src/geometry/rotation_specialization.rs

@@ -427,6 +427,16 @@ impl<N: Real> Rotation3<N> {
         ))
     }
 
+    /// Deprecated: Use [Rotation3::face_towards] instead.
+    #[deprecated(note="renamed to `face_towards`")]
+    pub fn new_observer_frames<SB, SC>(dir: &Vector<N, U3, SB>, up: &Vector<N, U3, SC>) -> Self
+    where
+        SB: Storage<N, U3>,
+        SC: Storage<N, U3>,
+    {
+        Self::face_towards(dir, up)
+    }
+
     /// Builds a right-handed look-at view matrix without translation.
     ///
     /// It maps the view direction `dir` to the **negative** `z` axis.

src/geometry/similarity_construction.rs

@@ -253,6 +253,16 @@ macro_rules! similarity_construction_impl(
                 Self::from_isometry(Isometry::<_, U3, $Rot>::face_towards(eye, target, up), scaling)
             }
 
+            /// Deprecated: Use [SimilarityMatrix3::face_towards] instead.
+            #[deprecated(note="renamed to `face_towards`")]
+            pub fn new_observer_frames(eye:    &Point3<N>,
+                                      target: &Point3<N>,
+                                      up:     &Vector3<N>,
+                                      scaling: N)
+                                      -> Self {
+                Self::face_towards(eye, target, up, scaling)
+            }
+
             /// Builds a right-handed look-at view matrix including scaling factor.
             ///
             /// This conforms to the common notion of right handed look-at matrix from the computer