diff --git a/polymer/eduke32/build/src/engine.c b/polymer/eduke32/build/src/engine.c
index 445cd6746..58d61d5ec 100644
--- a/polymer/eduke32/build/src/engine.c
+++ b/polymer/eduke32/build/src/engine.c
@@ -8505,9 +8505,11 @@ int32_t drawrooms(int32_t daposx, int32_t daposy, int32_t daposz,
         break;
 #ifdef USE_OPENGL
     case 3:
-        // I have no idea what the significance of this constant is,
-        // it was found out experimentally.             v  v
-        globalvisibility = scale(g_visibility<<2, xdimen, 1100);
+        // NOTE: In Polymost, the fragment depth depends on the x screen size!
+        if (r_usenewshading==2)
+            globalvisibility = scale(g_visibility<<2, xdimen, 1680);
+        else
+            globalvisibility = scale(g_visibility<<2, xdimen, 1100);
         break;
 # ifdef POLYMER
     case 4:
diff --git a/polymer/eduke32/build/src/polymer.c b/polymer/eduke32/build/src/polymer.c
index 95d706bee..7d6fc8f84 100644
--- a/polymer/eduke32/build/src/polymer.c
+++ b/polymer/eduke32/build/src/polymer.c
@@ -411,7 +411,7 @@ _prprogrambit   prprogrambits[PR_BIT_COUNT] = {
         "    fogFactor = exp2(-gl_Fog.density * gl_Fog.density * fragDepth * 1.442695);\n"
 #ifdef PR_LINEAR_FOG
         /* 0.65127==150/230, another constant found out by experiment. :/
-         * (150 is Polymost's FOGDISTCONST.) */
+         * (150 is Polymost's old FOGDISTCONST.) */
         "  } else {\n"
         "    fogFactor = gl_Fog.scale * (gl_Fog.end - fragDepth*0.65217);\n"
         "    fogFactor = clamp(fogFactor, 0.0, 1.0);"
diff --git a/polymer/eduke32/build/src/polymost.c b/polymer/eduke32/build/src/polymost.c
index 473ba2837..d1737cc46 100644
--- a/polymer/eduke32/build/src/polymost.c
+++ b/polymer/eduke32/build/src/polymost.c
@@ -839,7 +839,7 @@ void polymost_glinit()
 extern char nofog;  // in windows/SDL layers
 
 // For GL_LINEAR fog:
-#define FOGDISTCONST 150
+#define FOGDISTCONST 600
 #define FULLVIS_BEGIN 2.9e38
 #define FULLVIS_END 3.0e38
 
@@ -849,7 +849,7 @@ static inline void fogcalc(int32_t shade, int32_t vis, int32_t pal)
 
     if (r_usenewshading==2)
     {
-        float combvis = (float)(g_visibility * (uint8_t)(vis+16));
+        float combvis = (float)globalvisibility * (uint8_t)(vis+16);
 
         bglFogi(GL_FOG_MODE, GL_LINEAR);