Camera-Speed adjustment relative to target distance

Space Navigator Unity project/Assets/SpaceNavigator/Editor/ViewportController.cs

@@ -110,6 +110,11 @@ static void Fly(SceneView sceneView) {
 		static void Fly(SceneView sceneView, Vector3 translationInversion, Vector3 rotationInversion) {
 			SyncRigWithScene();
 
+
+			// Apply inversion of axes for fly/grabmove mode.
+			Vector3 translation = Vector3.Scale(SpaceNavigator.Translation, translationInversion) * cameraFlySpeedAdjustment();
+
+
 			// Apply inversion of axes for fly/grabmove mode.
 			Vector3 translation = Vector3.Scale(SpaceNavigator.Translation, translationInversion);
 			Vector3 rotation = Vector3.Scale(SpaceNavigator.Rotation.eulerAngles, rotationInversion);
@@ -142,9 +147,9 @@ static void Orbit(SceneView sceneView) {
 			}
 
 			SyncRigWithScene();
-
+			
 			// Apply inversion of axes for orbit mode.
-			Vector3 translation = Vector3.Scale(SpaceNavigator.Translation, Settings.OrbitInvertTranslation);
+			Vector3 translation = Vector3.Scale(SpaceNavigator.Translation, Settings.OrbitInvertTranslation) * cameraFlySpeedAdjustment();
 			Vector3 rotation = Vector3.Scale(SpaceNavigator.Rotation.eulerAngles, Settings.OrbitInvertRotation);
 
 			_camera.Translate(translation, Space.Self);
@@ -320,5 +325,25 @@ private static Vector3 SnapOnTranslation(Vector3 v, float snap) {
 				Mathf.RoundToInt(v.z / snap) * snap);
 		}
 		#endregion - Snapping -
+
+		private static float cameraFlySpeedAdjustment() {
+
+			if (Settings.Mode == OperationMode.Fly && !Settings.EnableCameraFlyspeedAdjustmentFlymode) return 1f;
+			if (Settings.Mode == OperationMode.Orbit && !Settings.EnableCameraFlyspeedAdjustmentOrbitmode) return 1f;
+
+			//calculate distance to selected object or world center, to adjust fly speed
+			Vector3 targetPosition = (Selection.activeTransform != null) ? Selection.activeTransform.position : new Vector3();
+			float distanceToTarget = (_camera.position - targetPosition).magnitude;
+			float flySpeedAdjustment = 1f;
+
+			if (distanceToTarget <= Settings.FlyspeedSlowdownDistance) {
+				//this is the practical maximum camera distance in Unity 2019.2, as with bigger distances the gizmos disappear
+				flySpeedAdjustment = Mathf.Pow(distanceToTarget * Settings.FlyspeedConstant, Settings.FlyspeedExponent);
+			} else {
+				flySpeedAdjustment = Mathf.Pow(Settings.FlyspeedSlowdownDistance * Settings.FlyspeedConstant, Settings.FlyspeedExponent) + (distanceToTarget - Settings.FlyspeedSlowdownDistance) * (Settings.FlyspeedSlowdownDistance / distanceToTarget);
+			}
+
+			return flySpeedAdjustment;
+		}
 	}
 }

Space Navigator Unity project/Assets/SpaceNavigator/Plugins/Settings/Settings.cs

@@ -53,6 +53,12 @@ public static class Settings {
 		public static float RotSens = RotSensDefault;
 		public static float RotSensMin = RotSensMinDefault;
 		public static float RotSensMax = RotSensMaxDefault;
+
+		public static bool EnableCameraFlyspeedAdjustmentFlymode = true;
+		public static bool EnableCameraFlyspeedAdjustmentOrbitmode = true;
+		public static int FlyspeedSlowdownDistance = 100000;
+		public static float FlyspeedExponent = 1.05f;
+		public static float FlyspeedConstant = 0.1f;
 
 #if UNITY_EDITOR_OSX || UNITY_STANDALONE_OSX
 	public const float RotDeadDefault = 30, RotDeadMinDefault = 0, RotDeadMaxDefault = 100f;