Index: binaries/data/mods/public/shaders/glsl/terrain_common.fs
===================================================================
--- binaries/data/mods/public/shaders/glsl/terrain_common.fs
+++ binaries/data/mods/public/shaders/glsl/terrain_common.fs
@@ -241,7 +241,12 @@
   #endif
 
   float los = texture2D(losTex, v_los).a;
-  los = los < 0.03 ? 0.0 : los;
+  float oloss = los;
+  los += texture2D(losTex, v_los-vec2(0.01, 0.00)).a;
+  los += texture2D(losTex, v_los+vec2(0.01, 0.00)).a;
+  los += texture2D(losTex, v_los-vec2(0.00, 0.01)).a;
+  los += texture2D(losTex, v_los+vec2(0.00, 0.01)).a;
+  los = los < 0.03 ? 0.0 : los/5.0 * oloss;
   color *= los;
 
   #if DECAL
Index: source/graphics/LOSTexture.cpp
===================================================================
--- source/graphics/LOSTexture.cpp
+++ source/graphics/LOSTexture.cpp
@@ -330,7 +330,7 @@
 		recreated = true;
 	}
 
-	PROFILE("recompute LOS texture");
+	PROFILE3("recompute LOS texture");
 
 	std::vector<u8> losData;
 	size_t pitch;
@@ -399,13 +399,12 @@
 			*dataPtr++ = 0;
 
 	// Horizontal blur:
-
 	for (size_t j = g_BlurSize/2; j < h + g_BlurSize/2; ++j)
 	{
 		for (size_t i = 0; i < w; ++i)
 		{
 			u8* d = &losData[i+j*pitch];
-			*d = (
+			*d = d[3] == 0 ? 0 : (
 				1*d[0] +
 				6*d[1] +
 				15*d[2] +
@@ -424,7 +423,7 @@
 		for (size_t i = 0; i < w; ++i)
 		{
 			u8* d = &losData[i+j*pitch];
-			*d = (
+			*d = d[3*pitch] == 0 ? 0 : (
 				1*d[0*pitch] +
 				6*d[1*pitch] +
 				15*d[2*pitch] +
Index: source/simulation2/helpers/Los.h
===================================================================
--- source/simulation2/helpers/Los.h
+++ source/simulation2/helpers/Los.h
@@ -27,7 +27,7 @@
  * This is the size, in meters, of every LOS tile.
  * (Note that this also means it is the minimal meaningful resolution of any vision range change).
  */
-static constexpr i32 LOS_TILE_SIZE = 4;
+static constexpr i32 LOS_TILE_SIZE = 8;
 
 enum class LosState : u8
 {