Hull-specific ambient lighting: light sources increase the amount of ambient light in rooms and the light can spread to adjacent rooms through gaps. Allows making the default ambient light much darker without making shadows look too dark in fully lit subs.

Subsurface/Source/Map/Gap.cs

@@ -30,8 +30,13 @@ namespace Barotrauma
         private float higherSurface;
         private float lowerSurface;
 
+        private Vector2 lerpedFlowForce;
+
         //if set to true, hull connections of this gap won't be updated when changes are being done to hulls
         public bool DisableHullRechecks;
+        
+        //can ambient light get through the gap even if it's not open
+        public bool PassAmbientLight;
 
         public float Open
         {
@@ -48,8 +53,6 @@ namespace Barotrauma
             get { return lerpedFlowForce; }
         }
 
-        private Vector2 lerpedFlowForce;
-
         public Hull FlowTargetHull
         {
             get { return flowTargetHull; }