Salvage expeditions (#12745)

Content.Shared/Parallax/Biomes/Layers/IBiomeLayer.cs

@@ -0,0 +1,22 @@
+using Robust.Shared.Noise;
+
+namespace Content.Shared.Parallax.Biomes.Layers;
+
+[ImplicitDataDefinitionForInheritors]
+public interface IBiomeLayer
+{
+    /// <summary>
+    /// Seed is used an offset from the relevant BiomeComponent's seed.
+    /// </summary>
+    FastNoiseLite Noise { get; }
+
+    /// <summary>
+    /// Threshold for this layer to be present. If set to 0 forces it for every tile.
+    /// </summary>
+    float Threshold { get; }
+
+    /// <summary>
+    /// Is the thresold inverted so we need to be lower than it.
+    /// </summary>
+    public bool Invert { get; }
+}