update
This commit is contained in:
Valera
@@ -1,303 +1,43 @@
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using Sandbox;
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using Sandbox.Services;
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using System;
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using System.Threading;
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namespace VeloX;
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public class Pacejka
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{
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public struct LateralForce()
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public class PacejkaPreset
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{
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[Description( "Shape factor" )]
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[Range( 1, 3 )] public float a0 { get; set; } = 1.4f; // 0
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[KeyProperty] public float B { get; set; } = 10.86f;
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[KeyProperty] public float C { get; set; } = 2.15f;
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[KeyProperty] public float D { get; set; } = 0.933f;
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[KeyProperty] public float E { get; set; } = 0.992f;
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[Description( "Load infl on lat friction coeff (*1000) (1/kN)" )]
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[Range( -100, 100 )] public float a1 { get; set; } = -0f; // 1
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public float Evaluate( float slip ) => D * MathF.Sin( C * MathF.Atan( B * slip - E * (B * slip - MathF.Atan( B * slip )) ) );
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[Description( "Lateral friction coefficient at load = 0 (*1000)" )]
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[Range( 1, 2500 )] public float a2 { get; set; } = 1688f; // 2
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[Description( "Maximum stiffness (N/deg)" )]
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[Range( 1, 5000 )] public float a3 { get; set; } = 2400f; // 3
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[Description( "Load at maximum stiffness (kN)" )]
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[Range( -100, 100 )] public float a4 { get; set; } = 6.026f; // 4
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[Description( "Camber infiuence on stiffness (%/deg/100)" )]
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[Range( -10, 10 )] public float a5 { get; set; } = 0f; // 5
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[Description( "Curvature change with load" )]
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[Range( -10, 10 )] public float a6 { get; set; } = -0.359f; // 6
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[Description( "Curvature at load = 0" )]
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[Range( -10, 10 )] public float a7 { get; set; } = 1.0f; // 7
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[Description( "Horizontal shift because of camber (deg/deg)" )]
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[Range( -10, 10 )] public float a8 { get; set; } = 0f; // 8
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[Description( "Load influence on horizontal shift (deg/kN)" )]
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[Range( -10, 10 )] public float a9 { get; set; } = 0;// 9
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[Description( "Horizontal shift at load = 0 (deg)" )]
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[Range( -10, 10 )] public float a10 { get; set; } = 0;// 10
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[Description( "Camber influence on vertical shift (N/deg/kN)" )]
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[Range( -10, 100 )] public float a111 { get; set; } = 0f; // 11
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[Description( "Camber influence on vertical shift (N/deg/kN**2" )]
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[Range( -10, 10 )] public float a112 { get; set; } = 0f; // 12
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[Description( "Load influence on vertical shift (N/kN)" )]
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[Range( -100, 100 )] public float a12 { get; set; } = 0f; // 13
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[Description( "Vertical shift at load = 0 (N)" )]
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[Range( -10, 10 )] public float a13 { get; set; } = 0f; // 14
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}
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public struct LongitudinalForce()
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{
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[Description( "Shape factor" )]
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[Range( 1, 3 )] public float b0 { get; set; } = 1.65f; // 0
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[Description( "Load infl on long friction coeff (*1000) (1/kN)" )]
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[Range( -300, 300 )] public float b1 { get; set; } = 0f; // 1
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[Description( "Longitudinal friction coefficient at load = 0 (*1000)" )]
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[Range( 0, 10000 )] public float b2 { get; set; } = 1690f; // 2
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[Description( "Curvature factor of stiffness (N/%/kN**2)" )]
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[Range( -100, 100 )] public float b3 { get; set; } = 0f; // 3
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[Description( "Change of stiffness with load at load = 0 (N/%/kN)" )]
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[Range( -1000, 1000 )] public float b4 { get; set; } = 229f; // 4
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[Description( "Change of progressivity of stiffness/load (1/kN)" )]
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[Range( -10, 10 )] public float b5 { get; set; } = 0f; // 5
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[Description( "Curvature change with load" )]
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[Range( -10, 10 )] public float b6 { get; set; } = 0f; // 6
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[Description( "Curvature change with load" )]
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[Range( -10, 10 )] public float b7 { get; set; } = 0f; // 7
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[Description( "Curvature at load = 0" )]
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[Range( -10, 10 )] public float b8 { get; set; } = -10f; // 7
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[Description( "Load influence on horizontal shift (%/kN)" )]
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[Range( -10, 10 )] public float b9 { get; set; } = 0f; // 9
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[Description( "Horizontal shift at load = 0 (%)" )]
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[Range( -10, 10 )] public float b10 { get; set; } = 0f; // 10
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}
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public struct AligningMoment()
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{
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[Description( "Shape factor" )]
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[Range( 1, 7 )] public float c0 { get; set; } = 2.0f; // 0
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[Description( "Load influence of peak value (Nm/kN**2)" )]
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[Range( -10, 10 )] public float c1 { get; set; } = -3.8f; // 1
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[Description( "Load influence of peak value (Nm/kN)" )]
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[Range( -10, 10 )] public float c2 { get; set; } = -3.14f; // 2
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[Description( "Curvature factor of stiffness (Nm/deg/kN**2" )]
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[Range( -10, 10 )] public float c3 { get; set; } = -1.16f; // 3
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[Description( "Change of stiffness with load at load = 0 (Nm/deg/kN)" )]
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[Range( -100, 100 )] public float c4 { get; set; } = -7.2f; // 4
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[Description( "Change of progressivity of stiffness/load (1/kN)" )]
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[Range( -10, 10 )] public float c5 { get; set; } = 0.0f; // 5
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[Description( "Camber influence on stiffness (%/deg/100)" )]
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[Range( -10, 10 )] public float c6 { get; set; } = 0.0f; // 6
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[Description( "Curvature change with load" )]
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[Range( -10, 10 )] public float c7 { get; set; } = 0.044f; // 7
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[Description( "Curvature change with load" )]
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[Range( -10, 10 )] public float c8 { get; set; } = -0.58f; // 8
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[Description( "Curvature at load = 0" )]
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[Range( -10, 10 )] public float c9 { get; set; } = 0.18f; // 9
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[Description( "Camber influence of stiffness" )]
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[Range( -10, 10 )] public float c10 { get; set; } = 0.0f; // 10
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[Description( "Camber influence on horizontal shift (deg/deg)" )]
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[Range( -10, 10 )] public float c11 { get; set; } = 0.0f; // 11
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[Description( "Load influence on horizontal shift (deg/kN)" )]
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[Range( -10, 10 )] public float c12 { get; set; } = 0.0f; // 12
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[Description( "Horizontal shift at load = 0 (deg)" )]
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[Range( -10, 10 )] public float c13 { get; set; } = 0.0f; // 13
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[Description( "Camber influence on vertical shift (Nm/deg/kN**2" )]
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[Range( -10, 10 )] public float c14 { get; set; } = 0.14f; // 14
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[Description( "Camber influence on vertical shift (Nm/deg/kN)" )]
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[Range( -10, 10 )] public float c15 { get; set; } = -1.029f; // 15
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[Description( "Load influence on vertical shift (Nm/kN)" )]
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[Range( -10, 10 )] public float c16 { get; set; } = 0.0f; // 16
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[Description( "Vertical shift at load = 0 (Nm)" )]
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[Range( -10, 10 )] public float c17 { get; set; } = 0.0f; // 17
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}
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public struct CombiningForce
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{
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public float gy1 = 1; // 0
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public float gy2 = 1; // 1
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public float gx1 = 1; // 2
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public float gx2 = 1f; // 3
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public CombiningForce()
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public float GetPeakSlip()
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{
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float peakSlip = -1;
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float yMax = 0;
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for ( float i = 0; i < 1f; i += 0.01f )
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{
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float y = Evaluate( i );
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if ( y > yMax )
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{
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yMax = y;
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peakSlip = i;
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}
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}
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return peakSlip;
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}
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}
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public PacejkaPreset Lateral { get; set; } = new();
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public PacejkaPreset Longitudinal { get; set; } = new();
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public LateralForce Lateral { get; set; } = new();
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public LongitudinalForce Longitudinal { get; set; } = new();
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public AligningMoment Aligning { get; set; } = new();
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public CombiningForce Combining = new();
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/// pacejka magic formula for longitudinal force
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public float PacejkaFx( float sigma, float Fz, float friction_coeff, out float maxforce_output )
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{
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var b = Longitudinal;
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// shape factor
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float C = b.b0;
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// peak factor
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float D = (b.b1 * Fz + b.b2) * Fz;
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// stiffness at sigma = 0
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float BCD = (b.b3 * Fz + b.b4) * Fz * MathF.Exp( -b.b5 * Fz );
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// stiffness factor
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float B = BCD / (C * D);
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// curvature factor
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float E = (b.b6 * Fz + b.b7) * Fz + b.b8;
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// horizontal shift
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float Sh = b.b9 * Fz + b.b10;
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// composite
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float S = 100 * sigma + Sh;
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// longitudinal force
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float BS = B * S;
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float Fx = D * MathF.Sin( C * MathF.Atan( BS - E * (BS - MathF.Atan( BS )) ) );
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// scale by surface friction
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Fx *= friction_coeff;
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maxforce_output = D;
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return Fx;
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}
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/// pacejka magic formula for lateral force
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public float PacejkaFy( float alpha, float Fz, float gamma, float friction_coeff, out float camber_alpha )
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{
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var a = Lateral;
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// shape factor
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float C = a.a0;
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// peak factor
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float D = (a.a1 * Fz + a.a2) * Fz;
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// stiffness at alpha = 0
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float BCD = a.a3 * MathF.Atan2( Fz, a.a4 ) * (1 - a.a5 * MathF.Abs( gamma ));
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// stiffness factor
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float B = BCD / (C * D);
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// curvature factor
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float E = a.a6 * Fz + a.a7;
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// horizontal shift
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float Sh = a.a8 * gamma + a.a9 * Fz + a.a10;
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// vertical shift
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float Sv = ((a.a111 * Fz + a.a112) * gamma + a.a12) * Fz + a.a13;
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// composite slip angle
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float S = alpha + Sh;
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// lateral force
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float BS = B * S;
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float Fy = D * MathF.Sin( C * MathF.Atan( BS - E * (BS - MathF.Atan( BS )) ) ) + Sv;
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// scale by surface friction
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Fy *= friction_coeff;
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camber_alpha = Sh + Sv / BCD * friction_coeff;
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return Fy;
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}
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/// pacejka magic formula for aligning torque
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public float PacejkaMz( float alpha, float Fz, float gamma, float friction_coeff )
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{
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var c = Aligning;
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// shape factor
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float C = c.c0;
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// peak factor
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float D = (c.c1 * Fz + c.c2) * Fz;
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// stiffness at alpha = 0
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float BCD = (c.c3 * Fz + c.c4) * Fz * (1 - c.c6 * MathF.Abs( gamma )) * MathF.Exp( -c.c5 * Fz );
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// stiffness factor
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float B = BCD / (C * D);
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// curvature factor
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float E = (c.c7 * Fz * Fz + c.c8 * Fz + c.c9) * (1 - c.c10 * MathF.Abs( gamma ));
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// horizontal shift
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float Sh = c.c11 * gamma + c.c12 * Fz + c.c13;
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// composite slip angle
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float S = alpha + Sh;
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// vertical shift
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float Sv = (c.c14 * Fz * Fz + c.c15 * Fz) * gamma + c.c16 * Fz + c.c17;
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// self-aligning torque
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float BS = B * S;
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float Mz = D * MathF.Sin( C * MathF.Atan( BS - E * (BS - MathF.Atan( BS )) ) ) + Sv;
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// scale by surface friction
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Mz *= friction_coeff;
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return Mz;
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}
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/// pacejka magic formula for the longitudinal combining factor
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public float PacejkaGx( float sigma, float alpha )
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{
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var p = Combining;
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float a = p.gx2 * sigma;
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float b = p.gx1 * alpha;
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float c = a * a + 1;
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return MathF.Sqrt( c / (c + b * b) );
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}
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/// pacejka magic formula for the lateral combining factor
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public float PacejkaGy( float sigma, float alpha )
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{
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var p = Combining;
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float a = p.gy2 * alpha;
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float b = p.gy1 * sigma;
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float c = a * a + 1;
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return MathF.Sqrt( c / (c + b * b) );
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}
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public float PacejkaFx( float slip ) => Longitudinal.Evaluate( slip );
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public float PacejkaFy( float slip ) => Lateral.Evaluate( slip );
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}
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@@ -1,8 +1,10 @@
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using Sandbox;
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using Sandbox.Rendering;
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using Sandbox.Services;
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using Sandbox.UI;
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using System;
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using System.Collections.Specialized;
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using System.Diagnostics.Metrics;
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using System.Numerics;
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using System.Text.RegularExpressions;
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using System.Threading;
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@@ -23,8 +25,8 @@ public partial class VeloXWheel : Component
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[Property] public float SlipCircleShape { get; set; } = 1.05f;
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[Property] public TirePreset TirePreset { get; set; }
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[Property] public float Width { get; set; } = 6;
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public float SideSlip => sideFriction.Slip.MeterToInch();
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public float ForwardSlip => forwardFriction.Slip.MeterToInch();
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public float SideSlip { get; private set; }
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public float ForwardSlip { get; private set; }
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[Sync] public float Torque { get; set; }
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[Sync, Range( 0, 1 )] public float Brake { get; set; }
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[Property] float BrakePowerMax { get; set; } = 3000;
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@@ -64,8 +66,8 @@ public partial class VeloXWheel : Component
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private Vector3 right;
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private Vector3 up;
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private Friction forwardFriction;
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private Friction sideFriction;
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private float forwardFriction;
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private float sideFriction;
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private Vector3 force;
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public float CounterTorque { get; private set; }
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@@ -111,9 +113,101 @@ public partial class VeloXWheel : Component
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private static float GetLongitudinalLoadCoefficient( float load ) => 11000 * (1 - MathF.Exp( -0.00014f * load ));
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private static float GetLateralLoadCoefficient( float load ) => 18000 * (1 - MathF.Exp( -0.0001f * load ));
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float lastload;
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private float inertia;
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private (float, float, float, float) StepLongitudinal( float Tm, float Tb, float Vx, float W, float Lc, float R, float I )
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{
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float wInit = W;
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float vxAbs = Math.Abs( Vx );
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float Sx;
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if ( Lc < 0.01f )
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{
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Sx = 0;
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}
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else if ( vxAbs >= 0.01f )
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{
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Sx = (W * R - Vx) / vxAbs;
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}
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else
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{
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Sx = (W * R - Vx) * 0.6f;
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}
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Sx = Math.Clamp( Sx, -1, 1 );
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W += Tm / I * Time.Delta;
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Tb *= W > 0 ? -1 : 1;
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float tbCap = Math.Abs( W ) * I / Time.Delta;
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float tbr = Math.Abs( Tb ) - Math.Abs( tbCap );
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tbr = Math.Max( tbr, 0 );
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Tb = Math.Clamp( Tb, -tbCap, tbCap );
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W += Tb / I * Time.Delta;
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float maxTorque = TirePreset.Pacejka.PacejkaFx( Math.Abs( Sx ) ) * Lc * R;
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float errorTorque = (W - Vx / R) * I / Time.Delta;
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float surfaceTorque = Math.Clamp( errorTorque, -maxTorque, maxTorque );
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W -= surfaceTorque / I * Time.Delta;
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float Fx = surfaceTorque / R;
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tbr *= (W > 0 ? -1 : 1);
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float TbCap2 = Math.Abs( W ) * I / Time.Delta;
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float Tb2 = Math.Clamp( tbr, -TbCap2, TbCap2 );
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W += Tb2 / I * Time.Delta;
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float deltaOmegaTorque = (W - wInit) * I / Time.Delta;
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float Tcnt = -surfaceTorque + Tb + Tb2 - deltaOmegaTorque;
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return (W, Sx, Fx, Tcnt);
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}
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private void StepLateral( float Vx, float Vy, float Lc, out float Sy, out float Fy )
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{
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float VxAbs = Math.Abs( Vx );
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if ( Lc < 0.01f )
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{
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Sy = 0;
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}
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else if ( VxAbs > 0.1f )
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{
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Sy = MathX.RadianToDegree( MathF.Atan( Vy / VxAbs ) ) / 50;
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}
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else
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{
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|
||||
Sy = Vy * (0.003f / Time.Delta);
|
||||
}
|
||||
|
||||
Sy = Math.Clamp( Sy, -1, 1 );
|
||||
float slipSign = Sy < 0 ? -1 : 1;
|
||||
Fy = -slipSign * TirePreset.Pacejka.PacejkaFy( Math.Abs( Sy ) ) * Lc;
|
||||
}
|
||||
|
||||
private void SlipCircle( float Sx, float Sy, float Fx, ref float Fy )
|
||||
{
|
||||
float SxAbs = Math.Abs( Sx );
|
||||
if ( SxAbs > 0.01f )
|
||||
{
|
||||
float SxClamped = Math.Clamp( Sx, -1, 1 );
|
||||
float SyClamped = Math.Clamp( Sy, -1, 1 );
|
||||
Vector2 combinedSlip = new( SxClamped * 1.05f, SyClamped );
|
||||
Vector2 slipDir = combinedSlip.Normal;
|
||||
|
||||
float F = MathF.Sqrt( Fx * Fx + Fy * Fy );
|
||||
float absSlipDirY = Math.Abs( slipDir.y );
|
||||
|
||||
Fy = F * absSlipDirY * (Fy < 0 ? -1 : 1);
|
||||
}
|
||||
}
|
||||
|
||||
public void DoPhysics( VeloXBase vehicle )
|
||||
{
|
||||
var pos = vehicle.WorldTransform.PointToWorld( StartPos );
|
||||
@@ -128,163 +222,95 @@ public partial class VeloXWheel : Component
|
||||
.Cylinder( Width, Radius, pos, endPos )
|
||||
.Rotated( vehicle.WorldTransform.Rotation * CylinderOffset )
|
||||
.UseRenderMeshes( false )
|
||||
.UseHitPosition( false )
|
||||
.UseHitPosition( true )
|
||||
.WithoutTags( vehicle.WheelIgnoredTags )
|
||||
.Run();
|
||||
//forward = ang.Forward;
|
||||
//right = ang.Right;
|
||||
up = ang.Up;
|
||||
|
||||
forward = Vector3.VectorPlaneProject( ang.Forward, Trace.Normal ).Normal;
|
||||
right = Vector3.VectorPlaneProject( ang.Right, Trace.Normal ).Normal;
|
||||
forward = Vector3.VectorPlaneProject( ang.Forward, Trace.Normal );
|
||||
right = Vector3.VectorPlaneProject( ang.Right, Trace.Normal );
|
||||
|
||||
var fraction = Trace.Fraction;
|
||||
|
||||
contactPos = pos - maxLen * fraction * up;
|
||||
contactPos = pos - maxLen * fraction * ang.Up;
|
||||
|
||||
LocalPosition = vehicle.WorldTransform.PointToLocal( contactPos );
|
||||
|
||||
DoSuspensionSounds( vehicle, fraction - lastFraction );
|
||||
lastFraction = fraction;
|
||||
|
||||
var normal = Trace.Normal;
|
||||
if ( !IsOnGround )
|
||||
return;
|
||||
|
||||
var vel = vehicle.Body.GetVelocityAtPoint( contactPos );
|
||||
|
||||
var offset = maxLen - (fraction * maxLen);
|
||||
var springForce = (offset * SpringStrength);
|
||||
var springForce = offset * SpringStrength;
|
||||
var damperForce = (lastSpringOffset - offset) * SpringDamper;
|
||||
|
||||
lastSpringOffset = offset;
|
||||
|
||||
// Vector3.CalculateVelocityOffset is broken (need fix)
|
||||
var velU = normal.Dot( vel );
|
||||
|
||||
var velU = Trace.Normal.Dot( vel );
|
||||
|
||||
if ( velU < 0 && offset + Math.Abs( velU * Time.Delta ) > SuspensionLength )
|
||||
{
|
||||
var impulse = (-velU / Time.Delta) * normal;
|
||||
var body = vehicle.Body.PhysicsBody;
|
||||
Vector3 com = body.MassCenter;
|
||||
Rotation bodyRot = body.Rotation;
|
||||
vehicle.Body.CalculateVelocityOffset( -velU / Time.Delta * Trace.Normal, pos, out var linearImp, out var angularImp );
|
||||
|
||||
Vector3 r = pos - com;
|
||||
vehicle.Body.Velocity += linearImp;
|
||||
vehicle.Body.AngularVelocity += angularImp;
|
||||
vehicle.Body.CalculateVelocityOffset( Trace.HitPosition - (contactPos + Trace.Normal * velU * Time.Delta), pos, out var lin, out _ );
|
||||
|
||||
Vector3 torque = Vector3.Cross( r, impulse );
|
||||
|
||||
Vector3 torqueLocal = bodyRot.Inverse * torque;
|
||||
Vector3 angularVelocityLocal = torqueLocal * body.Inertia.Inverse;
|
||||
|
||||
var centerAngularVelocity = bodyRot * angularVelocityLocal;
|
||||
|
||||
var centerVelocity = impulse * (1 / body.Mass);
|
||||
|
||||
vehicle.Body.Velocity += centerVelocity * 10;
|
||||
vehicle.Body.AngularVelocity += centerAngularVelocity;
|
||||
vehicle.WorldPosition += lin / Time.Delta;
|
||||
damperForce = 0;
|
||||
|
||||
}
|
||||
|
||||
force = (springForce - damperForce) * MathF.Max( 0, up.Dot( normal ) ) * normal;
|
||||
force = (springForce - damperForce) * Trace.Normal;
|
||||
|
||||
load = Math.Max( force.z, 0 ).InchToMeter();
|
||||
load = Math.Max( springForce - damperForce, 0 );
|
||||
float R = Radius.InchToMeter();
|
||||
|
||||
float forwardSpeed = vel.Dot( forward ).InchToMeter();
|
||||
float sideSpeed = vel.Dot( right ).InchToMeter();
|
||||
|
||||
float camber_rad = CamberAngle.DegreeToRadian();
|
||||
float R = Radius.InchToMeter();
|
||||
float longitudinalLoadCoefficient = GetLongitudinalLoadCoefficient( load );
|
||||
float lateralLoadCoefficient = GetLateralLoadCoefficient( load );
|
||||
|
||||
float linearSpeed = angularVelocity * Radius.InchToMeter();
|
||||
float F_roll = TirePreset.GetRollingResistance( angularVelocity * R, 1.0f ) * 10000;
|
||||
|
||||
( float W, float Sx, float Fx, float counterTq) = StepLongitudinal(
|
||||
Torque,
|
||||
Brake * BrakePowerMax + F_roll,
|
||||
forwardSpeed,
|
||||
angularVelocity,
|
||||
longitudinalLoadCoefficient,
|
||||
R,
|
||||
Inertia
|
||||
);
|
||||
|
||||
float F_roll = TirePreset.GetRollingResistance( linearSpeed, 1.0f );
|
||||
F_roll *= -Math.Clamp( linearSpeed * 0.25f, -1, 1 );
|
||||
StepLateral( forwardSpeed, sideSpeed, lateralLoadCoefficient, out float Sy, out float Fy );
|
||||
|
||||
float T_brake = Brake * BrakePowerMax;
|
||||
T_brake *= -Math.Clamp( linearSpeed * 0.25f, -1, 1 );
|
||||
|
||||
float Winit = angularVelocity;
|
||||
|
||||
angularVelocity += F_roll * 9.80665f / Inertia * Time.Delta;
|
||||
|
||||
angularVelocity += Torque / Inertia * Time.Delta;
|
||||
|
||||
|
||||
angularVelocity += T_brake / Inertia * Time.Delta;
|
||||
|
||||
if ( IsOnGround )
|
||||
{
|
||||
TirePreset.ComputeSlip( forwardSpeed, sideSpeed, angularVelocity, R, out var slip, out var slip_ang );
|
||||
var fx = TirePreset.Pacejka.PacejkaFx( slip, load, 1, out var maxTorque );
|
||||
var fy = TirePreset.Pacejka.PacejkaFy( slip_ang * load, load, camber_rad, 1, out var _ );
|
||||
|
||||
maxTorque *= R;
|
||||
var errorTorque = (angularVelocity - forwardSpeed / R) * BaseInertia / Time.Delta;
|
||||
|
||||
var surfaceTorque = Math.Clamp( errorTorque, -maxTorque, maxTorque );
|
||||
|
||||
angularVelocity -= surfaceTorque / Inertia * Time.Delta;
|
||||
|
||||
|
||||
float deltaOmegaTorque = (angularVelocity - Winit) * Inertia / Time.Delta;
|
||||
|
||||
CounterTorque = -surfaceTorque - deltaOmegaTorque;
|
||||
forwardFriction.Slip = slip;
|
||||
forwardFriction.Force = -fx;
|
||||
forwardFriction.Speed = forwardSpeed;
|
||||
sideFriction.Slip = slip_ang;
|
||||
sideFriction.Force = fy;
|
||||
sideFriction.Speed = sideSpeed;
|
||||
|
||||
vehicle.Body.ApplyForceAt( pos, force / Time.Delta * ProjectSettings.Physics.SubSteps );
|
||||
|
||||
Vector3 frictionForce = forward * forwardFriction.Force + right * sideFriction.Force;
|
||||
vehicle.Body.ApplyForceAt( pos, frictionForce * ProjectSettings.Physics.SubSteps );
|
||||
}
|
||||
else
|
||||
{
|
||||
forwardFriction = new();
|
||||
sideFriction = new();
|
||||
}
|
||||
SlipCircle( Sx, Sy, Fx, ref Fy );
|
||||
|
||||
CounterTorque = counterTq;
|
||||
angularVelocity = W;
|
||||
|
||||
force += forward * Fx;
|
||||
force += right * Fy * Math.Clamp( vehicle.TotalSpeed * 0.005f, 0, 1 );
|
||||
ForwardSlip = Sx;
|
||||
SideSlip = Sy * Math.Clamp( vehicle.TotalSpeed * 0.005f, 0, 1 );
|
||||
|
||||
vehicle.Body.ApplyForceAt( pos, force / Time.Delta );
|
||||
|
||||
}
|
||||
|
||||
//todo
|
||||
protected (float Mass, float Inertia) CalcMassAndInertia()
|
||||
{
|
||||
// section width in millimeters, measured from sidewall to sidewall
|
||||
// ratio of sidewall height to section width in percent
|
||||
// diameter of the wheel in inches
|
||||
var tire_size = new Vector3( 215, 45, 17 );
|
||||
|
||||
float tire_width = tire_size[0] * 0.001f;
|
||||
float tire_aspect_ratio = tire_size[1] * 0.01f;
|
||||
float tire_radius = tire_size[2] * 0.5f * 0.0254f + tire_width * tire_aspect_ratio;
|
||||
float tire_thickness = 0.02f;
|
||||
float tire_density = 1000; // rubber
|
||||
|
||||
float rim_radius = tire_radius - tire_width * tire_aspect_ratio;
|
||||
float rim_width = tire_width;
|
||||
float rim_thickness = 0.01f;
|
||||
float rim_density = 2700; // aluminium
|
||||
|
||||
float tire_volume = float.Pi * tire_width * tire_thickness * (2 * tire_radius - tire_thickness);
|
||||
float rim_volume = float.Pi * rim_width * rim_thickness * (2 * rim_radius - rim_thickness);
|
||||
float tire_mass = tire_density * tire_volume;
|
||||
float rim_mass = rim_density * rim_volume;
|
||||
float tire_inertia = tire_mass * tire_radius * tire_radius;
|
||||
float rim_inertia = rim_mass * rim_radius * rim_radius;
|
||||
|
||||
float mass = tire_mass + rim_mass;
|
||||
float inertia = tire_inertia + rim_inertia;
|
||||
|
||||
return (mass, inertia);
|
||||
}
|
||||
|
||||
// debug
|
||||
#if DEBUG
|
||||
protected override void OnUpdate()
|
||||
{
|
||||
//DebugOverlay.Normal( contactPos, forward * forwardFriction.Force / 1000f, Color.Red, overlay: true );
|
||||
//DebugOverlay.Normal( contactPos, right * sideFriction.Force / 1000f, Color.Green, overlay: true );
|
||||
//DebugOverlay.Normal( contactPos, up * force / 1000f, Color.Blue, overlay: true );
|
||||
DebugOverlay.Normal( contactPos, forward * forwardFriction, Color.Red, overlay: true );
|
||||
DebugOverlay.Normal( contactPos, right * sideFriction, Color.Green, overlay: true );
|
||||
DebugOverlay.Normal( contactPos, up * force / 1000f, Color.Blue, overlay: true );
|
||||
}
|
||||
#endif
|
||||
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user