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Implement LimExp

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This commit is contained in:
Kevin Zheng
2025-12-31 19:00:11 -06:00
parent cc8859b863
commit 30739d076a
1 changed files with 13 additions and 1 deletions
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14
Content.Server/Atmos/EntitySystems/GenericGasReactionSystem.cs
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@@ -17,6 +17,18 @@ public sealed class GenericGasReactionSystem : EntitySystem
[Dependency] private readonly AtmosphereSystem _atmosphere = default!;
private float LimExp(float x)
{
const float LimX = 26.7f; // ln(LimY) where LimY=3e11 (1/KneeRate + 3 orders of magnitude)
if (x < LimX)
return MathF.Exp(x);
// Linearize beyond LimX
float dxLim = 1/LimX; // derivative of ln(x) at x=LimX
float argLim = MathF.Exp(LimX);
return dxLim*(x - LimX) + argLim;
}
/// <summary>
/// Return a reaction rate (in units reactants per second) for a given reaction. Based on the
/// Arrhenius equation (https://en.wikipedia.org/wiki/Arrhenius_equation).
@@ -45,7 +57,7 @@ public sealed class GenericGasReactionSystem : EntitySystem
if (temp < Atmospherics.TCMB)
return 0;
return A * MathF.Exp(-Ea / (Atmospherics.R * Math.Min(temp, MaxTemperature)));
return A * LimExp(-Ea / (Atmospherics.R * Math.Min(temp, MaxTemperature)));
}
/// <summary>