56 lines
2.0 KiB
C#
56 lines
2.0 KiB
C#
using Sandbox;
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using System;
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using System.Collections.Generic;
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namespace VeloX;
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public partial class VeloXCar
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{
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private class DownforcePoint
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{
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[KeyProperty] public float MaxForce { get; set; }
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[KeyProperty] public Vector3 Position { get; set; }
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}
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public const float RHO = 10.225f;
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[Property, Feature( "Aerodinamics" )] public Vector3 Dimensions = new( 2f, 4.5f, 1.5f );
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[Property, Feature( "Aerodinamics" )] public float FrontalCd { get; set; } = 0.35f;
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[Property, Feature( "Aerodinamics" )] public float SideCd { get; set; } = 1.05f;
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[Property, Feature( "Aerodinamics" )] public float MaxDownforceSpeed { get; set; } = 80f;
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[Property, Feature( "Aerodinamics" )] private List<DownforcePoint> DownforcePoints { get; set; } = [];
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private float _forwardSpeed;
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private float _frontalArea;
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private float _sideArea;
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private float _sideSpeed;
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private float lateralDragForce;
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private float longitudinalDragForce;
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private void SimulateAerodinamics( float dt )
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{
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if ( TotalSpeed < 1f )
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{
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longitudinalDragForce = 0;
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lateralDragForce = 0;
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return;
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}
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_frontalArea = Dimensions.x * Dimensions.z * 0.85f;
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_sideArea = Dimensions.y * Dimensions.z * 0.8f;
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_forwardSpeed = LocalVelocity.x.InchToMeter();
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_sideSpeed = LocalVelocity.y.InchToMeter();
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longitudinalDragForce = 0.5f * RHO * _frontalArea * FrontalCd * (_forwardSpeed * _forwardSpeed) * (_forwardSpeed > 0 ? -1f : 1f);
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lateralDragForce = 0.5f * RHO * _sideArea * SideCd * (_sideSpeed * _sideSpeed) * (_sideSpeed > 0 ? -1f : 1f);
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var force = new Vector3( longitudinalDragForce.MeterToInch(), lateralDragForce.MeterToInch(), 0 ).RotateAround( Vector3.Zero, WorldRotation );
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Body.ApplyForce( force );
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//DebugOverlay.Normal( WorldPosition, force );
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float speedPercent = TotalSpeed / MaxDownforceSpeed;
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float forceCoeff = 1f - (1f - MathF.Pow( speedPercent, 2f ));
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foreach ( DownforcePoint dp in DownforcePoints )
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Body.ApplyForceAt( Transform.World.PointToWorld( dp.Position ), forceCoeff.MeterToInch() * dp.MaxForce.MeterToInch() * -WorldRotation.Up );
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}
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}
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