Make miasma start being visible later (#10128)

Content.Server/Atmos/EntitySystems/GasTileOverlaySystem.cs

@@ -149,7 +149,7 @@ namespace Content.Server.Atmos.EntitySystems
                     if (moles >= gas.GasMolesVisible)
                     {
                         opacity[i] = (byte) (ContentHelpers.RoundToLevels(
-                            MathHelper.Clamp01(moles / gas.GasMolesVisibleMax) * 255, byte.MaxValue, _thresholds) * 255 / (_thresholds - 1));
+                            MathHelper.Clamp01((moles - gas.GasMolesVisible) / (gas.GasMolesVisibleMax - gas.GasMolesVisible)) * 255, byte.MaxValue, _thresholds) * 255 / (_thresholds - 1));
                     }
                     i++;
                 }

Content.Shared/Atmos/Prototypes/GasPrototype.cs

@@ -44,7 +44,10 @@ namespace Content.Shared.Atmos.Prototypes
         /// <summary>
         ///     Visibility for this gas will be max after this value.
         /// </summary>
-        public float GasMolesVisibleMax => GasMolesVisible * Atmospherics.FactorGasVisibleMax;
+        public float GasMolesVisibleMax => GasMolesVisible * GasVisibilityFactor;
+
+        [DataField("gasVisbilityFactor")]
+        public float GasVisibilityFactor = Atmospherics.FactorGasVisibleMax;
 
         /// <summary>
         ///     If this reagent is in gas form, this is the path to the overlay that will be used to make the gas visible.

Resources/Prototypes/Atmospherics/gases.yml

@@ -66,6 +66,8 @@
   molarMass: 44
   gasOverlaySprite: /Textures/Effects/atmospherics.rsi
   gasOverlayState: miasma
+  gasMolesVisible: 2
+  gasVisbilityFactor: 3.5
   color: 56941E
   reagent: Miasma