make follow-rotation mode an absolute value

instead of proportional to interaction sphere of anchor node.
can be overridden by a node if one so wishes.

src/scene/scenegraphnode.cpp

@@ -217,6 +217,16 @@ namespace {
         openspace::properties::Property::Visibility::AdvancedUser
     };
 
+    constexpr openspace::properties::Property::PropertyInfo FollowRotationDistanceInfo =
+    {
+        "FollowRotationDistance",
+        "Follow Rotation Distance",
+        "Distance within which the orbital navigator will follow along this nodes"
+        "rotation. A value less than zero means that the navigator will never follow"
+        "along with the nodes rotation.",
+        openspace::properties::Property::Visibility::AdvancedUser
+    };
+
     struct [[codegen::Dictionary(SceneGraphNode)]] Parameters {
         // The identifier of this scene graph node. This name must be unique among all
         // scene graph nodes that are loaded in a specific scene. If a duplicate is
@@ -246,6 +256,9 @@ namespace {
         // [[codegen::verbatim(SupportsDirectInteractionInfo.description)]]
         std::optional<bool> supportsDirectInteraction;
 
+        // [[codegen::verbatim(FollowRotationDistanceInfo.description)]]
+        std::optional<double> followRotationDistance;
+
         struct Transform {
             // This node describes a translation that is applied to the scene graph node
             // and all its children. Depending on the 'Type' of the translation, this can
@@ -401,6 +414,8 @@ ghoul::mm_unique_ptr<SceneGraphNode> SceneGraphNode::createFromDictionary(
     result->_approachFactor = p.approachFactor.value_or(result->_approachFactor);
     result->_reachFactor = p.reachFactor.value_or(result->_reachFactor);
 
+    result->_followRotationDistance = p.followRotationDistance.value_or(result->_followRotationDistance);
+
     if (p.transform.has_value()) {
         ZoneScopedN("Transform");
 
@@ -564,6 +579,7 @@ SceneGraphNode::SceneGraphNode()
     , _visibilityDistance(VisibilityDistanceInfo, 6e10f)
     , _supportsDirectInteraction(SupportsDirectInteractionInfo, false)
     , _showDebugSphere(ShowDebugSphereInfo, false)
+    , _followRotationDistance(FollowRotationDistanceInfo, -1.0, -1.0)
 {
     addProperty(_computeScreenSpaceValues);
     addProperty(_screenSpacePosition);
@@ -1293,6 +1309,11 @@ double SceneGraphNode::approachFactor() const {
     return _approachFactor;
 }
 
+double SceneGraphNode::followRotationDistance() const
+{
+    return _followRotationDistance;
+}
+
 bool SceneGraphNode::supportsDirectInteraction() const {
     return _supportsDirectInteraction;
 }