Normalize quaternions

crates/re_types/definitions/rerun/datatypes/quaternion.fbs

@@ -7,6 +7,9 @@ namespace rerun.datatypes;
 // ---
 
 /// A Quaternion represented by 4 real numbers.
+///
+/// Note: although the x,y,z,w components of the quaternion will be passed through to the
+/// datastore as provided, when used in the viewer Quaternions will always be normalized.
 //
 // Expectations:
 struct Quaternion (

crates/re_types/src/datatypes/quaternion_ext.rs

@@ -28,7 +28,7 @@ impl From<Quaternion> for glam::Quat {
     #[inline]
     fn from(q: Quaternion) -> Self {
         let [x, y, z, w] = q.0;
-        Self::from_xyzw(x, y, z, w)
+        Self::from_xyzw(x, y, z, w).normalize()
     }
 }