Fix (or a workaround) to characters teleporting inside/through colliders when leaving a sub (see #552). Gaps do a raycast out from the sub to see if there are obstacles outside, and if so, ragdolls place a collider at the corresponding position inside the sub. The collider is simply a straight axis-aligned line atm, so it doesn't work accurately with sloped ice/submarine walls, but does prevent the ragdoll from ending up inside the obstacles. TODO: use a few edges to approximate the shape of the obstacles more closely?

Barotrauma/BarotraumaShared/Source/Map/Submarine.cs

@@ -75,6 +75,7 @@ namespace Barotrauma
 
         private static Vector2 lastPickedPosition;
         private static float lastPickedFraction;
+        private static Vector2 lastPickedNormal;
 
         private Md5Hash hash;
         
@@ -120,6 +121,11 @@ namespace Barotrauma
             get { return lastPickedFraction; }
         }
 
+        public static Vector2 LastPickedNormal
+        {
+            get { return lastPickedNormal; }
+        }
+
         public bool Loading
         {
             get;
@@ -593,6 +599,7 @@ namespace Barotrauma
             }
 
             float closestFraction = 1.0f;
+            Vector2 closestNormal = Vector2.Zero;
             Body closestBody = null;
             GameMain.World.RayCast((fixture, point, normal, fraction) =>
             {
@@ -616,6 +623,7 @@ namespace Barotrauma
                 if (fraction < closestFraction)
                 {
                     closestFraction = fraction;
+                    closestNormal = normal;
                     if (fixture.Body != null) closestBody = fixture.Body;
                 }
                 return fraction;
@@ -624,6 +632,7 @@ namespace Barotrauma
 
             lastPickedPosition = rayStart + (rayEnd - rayStart) * closestFraction;
             lastPickedFraction = closestFraction;
+            lastPickedNormal = closestNormal;
             
             return closestBody;
         }
@@ -636,6 +645,7 @@ namespace Barotrauma
         {
             Body closestBody = null;
             float closestFraction = 1.0f;
+            Vector2 closestNormal = Vector2.Zero;
 
             if (Vector2.Distance(rayStart, rayEnd) < 0.01f)
             {
@@ -664,6 +674,7 @@ namespace Barotrauma
                 {
                     closestBody = fixture.Body;
                     closestFraction = fraction;
+                    closestNormal = normal;
                 }
                 return closestFraction;
             }
@@ -672,6 +683,7 @@ namespace Barotrauma
 
             lastPickedPosition = rayStart + (rayEnd - rayStart) * closestFraction;
             lastPickedFraction = closestFraction;
+            lastPickedNormal = closestNormal;
             return closestBody;
         }