From d1c86ee235235c1f06147f0137f3feffe70a4d98 Mon Sep 17 00:00:00 2001
From: ArtisticRoomba <145879011+ArtisticRoomba@users.noreply.github.com>
Date: Mon, 16 Mar 2026 18:26:14 -0700
Subject: [PATCH] Fix floating point tilefire nonsense (#43263)

* Change method call and epsilon

* holy guacamole
---
 .../Atmos/EntitySystems/AtmosphereSystem.Hotspot.cs         | 2 +-
 Content.Shared/Atmos/Atmospherics.cs                        | 2 +-
 .../Atmos/EntitySystems/SharedAtmosphereSystem.Gases.cs     | 6 +++---
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/Content.Server/Atmos/EntitySystems/AtmosphereSystem.Hotspot.cs b/Content.Server/Atmos/EntitySystems/AtmosphereSystem.Hotspot.cs
index d667d99435c..5022f3c99a0 100644
--- a/Content.Server/Atmos/EntitySystems/AtmosphereSystem.Hotspot.cs
+++ b/Content.Server/Atmos/EntitySystems/AtmosphereSystem.Hotspot.cs
@@ -204,7 +204,7 @@ public sealed partial class AtmosphereSystem
         if (!IsMixtureOxidizer(tile.Air))
             return;
 
-        var isFlammable = IsMixtureIgnitable(tile.Air);
+        var isFlammable = IsMixtureFuel(tile.Air);
 
         if (tile.Hotspot.Valid)
         {
diff --git a/Content.Shared/Atmos/Atmospherics.cs b/Content.Shared/Atmos/Atmospherics.cs
index e53ce29fd32..10d303cd1d4 100644
--- a/Content.Shared/Atmos/Atmospherics.cs
+++ b/Content.Shared/Atmos/Atmospherics.cs
@@ -22,7 +22,7 @@ namespace Content.Shared.Atmos
         /// <summary>
         /// Global Atmospherics epsilon. Used for all general floating-point comparisons.
         /// </summary>
-        public const float Epsilon = 0.001f;
+        public const float Epsilon = 0.5f;
 
         /// <summary>
         ///     Maximum external pressure (in kPA) a gas miner will, by default, output to.
diff --git a/Content.Shared/Atmos/EntitySystems/SharedAtmosphereSystem.Gases.cs b/Content.Shared/Atmos/EntitySystems/SharedAtmosphereSystem.Gases.cs
index ce50fbb3b0e..c7267393dd5 100644
--- a/Content.Shared/Atmos/EntitySystems/SharedAtmosphereSystem.Gases.cs
+++ b/Content.Shared/Atmos/EntitySystems/SharedAtmosphereSystem.Gases.cs
@@ -115,7 +115,7 @@ public abstract partial class SharedAtmosphereSystem
     /// considered ignitable, for both oxidizer and fuel.</param>
     /// <returns>True if the <see cref="GasMixture"/> is ignitable, otherwise, false.</returns>
     [PublicAPI]
-    public bool IsMixtureIgnitable(GasMixture mixture, float epsilon = 0.001f)
+    public bool IsMixtureIgnitable(GasMixture mixture, float epsilon = Atmospherics.Epsilon)
     {
         return IsMixtureFuel(mixture, epsilon) && IsMixtureOxidizer(mixture, epsilon);
     }
@@ -128,7 +128,7 @@ public abstract partial class SharedAtmosphereSystem
     /// is considered fuel.</param>
     /// <returns>True if the <see cref="GasMixture"/> is fuel, otherwise, false.</returns>
     [PublicAPI]
-    public abstract bool IsMixtureFuel(GasMixture mixture, float epsilon = 0.001f);
+    public abstract bool IsMixtureFuel(GasMixture mixture, float epsilon = Atmospherics.Epsilon);
 
     /// <summary>
     /// Determines if a <see cref="GasMixture"/> has oxidizer gases in it or not.
@@ -138,7 +138,7 @@ public abstract partial class SharedAtmosphereSystem
     /// is considered an oxidizer.</param>
     /// <returns>True if the <see cref="GasMixture"/> is an oxidizer, otherwise, false.</returns>
     [PublicAPI]
-    public abstract bool IsMixtureOxidizer(GasMixture mixture, float epsilon = 0.001f);
+    public abstract bool IsMixtureOxidizer(GasMixture mixture, float epsilon = Atmospherics.Epsilon);
 
     /// <summary>
     /// Calculates the heat capacity for a <see cref="GasMixture"/>.