Automatic merge of T1.5.1-922-g0a17d985e and 16 pull requests

- Pull request #570 at 3539862: Experimental glTF 2.0 support with PBR lighting
- Pull request #839 at d00beb9: First phase of https://blueprints.launchpad.net/or/+spec/additional-cruise-control-parameters
- Pull request #876 at f92de76: docs: add source for documents previously on website to source Documentation folder
- Pull request #882 at 3ca0eb1: Blueprint/train car operations UI window
- Pull request #885 at 42092cb: feat: Add notifications to Menu
- Pull request #886 at 6c0785b: Scene viewer extension to TrackViewer
- Pull request #892 at 1f5ba4c: Signal Function OPP_SIG_ID_TRAINPATH
- Pull request #896 at 5866028: First implementation of https://blueprints.launchpad.net/or/+spec/specific-sounds-for-ai-trains
- Pull request #903 at 29f3d1a: Downloading route content (Github, zip)
- Pull request #912 at f7b85e4: New Triple Valve Features Vol. 2
- Pull request #919 at 26cc6a8: Added mouse wheel support for controls which can be moved by pressing t…
- Pull request #923 at 5489025: Add curve squeal to route
- Pull request #924 at 6c2c3cd: Default Asset Improvements
- Pull request #925 at e3b1688: Fix brakeshoe force bug
- Pull request #927 at cf687d4: AI Train Power Supply/Lights Fix
- Pull request #928 at 1f23512: Fix Missing Initializations From Copy in MSTSLocomotive

Author: openrails-bot

Source/Orts.Simulation/Simulation/RollingStocks/TrainCar.cs

@@ -583,6 +583,9 @@ public Direction Direction
         protected SmoothedData CurveForceFilter = new SmoothedData(0.75f);
         public float CurveForceNFiltered;
 
+        protected SmoothedData CurveSquealAoAmRadFilter = new SmoothedData(0.75f);
+        public float CurveSquealAoAmRadFiltered;
+
         public float TunnelForceN;  // Resistive force due to tunnel, in Newtons
         public float FrictionForceN; // in Newtons ( kg.m/s^2 ) unsigned, includes effects of curvature
         public float BrakeForceN;    // current braking force applied to slow train (Newtons) - will be impacted by wheel/rail friction
@@ -982,6 +985,9 @@ public virtual void Update(float elapsedClockSeconds)
 
             AngleOfAttackmRad = GetAngleofAttackmRad();
 
+            CurveSquealAoAmRadFilter.Update(elapsedClockSeconds, AngleOfAttackmRad);
+            CurveSquealAoAmRadFiltered = CurveSquealAoAmRadFilter.SmoothedValue;
+
             UpdateCurveSpeedLimit(); // call this first as it will provide inputs for the curve force.
             UpdateCurveForce(elapsedClockSeconds);
             UpdateTunnelForce();
@@ -2277,6 +2283,7 @@ public virtual void Save(BinaryWriter outf)
             outf.Write(CarHeatCurrentCompartmentHeatJ);
             outf.Write(CarSteamHeatMainPipeSteamPressurePSI);
             outf.Write(CarHeatCompartmentHeaterOn);
+            outf.Write(CurveSquealAoAmRadFiltered);
         }
 
         // Game restore
@@ -2301,6 +2308,8 @@ public virtual void Restore(BinaryReader inf)
             CarSteamHeatMainPipeSteamPressurePSI = inf.ReadSingle();
             CarHeatCompartmentHeaterOn = inf.ReadBoolean();
             FreightAnimations?.LoadDataList?.Clear();
+            CurveSquealAoAmRadFiltered = inf.ReadSingle();
+            CurveSquealAoAmRadFilter.ForceSmoothValue(CurveSquealAoAmRadFiltered);
         }
 
         //================================================================================================//

Source/RunActivity/Viewer3D/Sound.cs

@@ -1515,7 +1515,7 @@ private float ReadValue(Orts.Formats.Msts.VolumeCurve.Controls control, MSTSWago
                 case Orts.Formats.Msts.VolumeCurve.Controls.Variable3Controlled: return car.Variable3;
                 case Orts.Formats.Msts.VolumeCurve.Controls.BrakeCylControlled: return car.BrakeSystem.GetCylPressurePSI();
                 case Orts.Formats.Msts.VolumeCurve.Controls.CurveForceControlled: return car.CurveForceNFiltered;
-                case Orts.Formats.Msts.VolumeCurve.Controls.AngleofAttackControlled: return car.AngleOfAttackmRad;
+                case Orts.Formats.Msts.VolumeCurve.Controls.AngleofAttackControlled: return car.CurveSquealAoAmRadFiltered;
                 case Orts.Formats.Msts.VolumeCurve.Controls.CarFrictionControlled: return car.Train.WagonCoefficientFriction;
                 default: return 0;
             }