diff --git a/apps/openmw/mwgui/map_window.cpp b/apps/openmw/mwgui/map_window.cpp
index bbb2be648..34f246d8b 100644
--- a/apps/openmw/mwgui/map_window.cpp
+++ b/apps/openmw/mwgui/map_window.cpp
@@ -397,7 +397,7 @@ void MapWindow::globalMapUpdatePlayer ()
     Ogre::Vector2 dir (orient.yAxis ().x, -orient.yAxis().z);
 
     float worldX, worldY;
-    mGlobalMapRender->worldPosToImageSpace (pos.x, pos.z, worldX, worldY);
+    mGlobalMapRender->worldPosToImageSpace (pos.x, pos.y, worldX, worldY);
     worldX *= mGlobalMapRender->getWidth();
     worldY *= mGlobalMapRender->getHeight();
 
diff --git a/apps/openmw/mwrender/globalmap.cpp b/apps/openmw/mwrender/globalmap.cpp
index 072015f9a..055faaa1f 100644
--- a/apps/openmw/mwrender/globalmap.cpp
+++ b/apps/openmw/mwrender/globalmap.cpp
@@ -190,7 +190,7 @@ namespace MWRender
     {
         imageX = float(x / 8192.f - mMinX) / (mMaxX - mMinX + 1);
 
-        imageY = 1.f-float(-z / 8192.f - mMinY) / (mMaxY - mMinY + 1);
+        imageY = 1.f-float(z / 8192.f - mMinY) / (mMaxY - mMinY + 1);
     }
 
     void GlobalMap::cellTopLeftCornerToImageSpace(int x, int y, float& imageX, float& imageY)
diff --git a/files/materials/objects.shader b/files/materials/objects.shader
index 6adf7e3fa..0f1b3722f 100644
--- a/files/materials/objects.shader
+++ b/files/materials/objects.shader
@@ -296,7 +296,7 @@
     
     
         float darkness = VISIBILITY*2.0;
-        darkness = clamp((waterEyePos.y - waterLevel + darkness)/darkness,0.2,1.0);
+        darkness = clamp((waterEyePos.z - waterLevel + darkness)/darkness,0.2,1.0);
         watercolour *= darkness;
 
         float isUnderwater = (worldPos.z < waterLevel) ? 1.0 : 0.0;
diff --git a/files/materials/terrain.shader b/files/materials/terrain.shader
index e4f1cf091..d8bc00c18 100644
--- a/files/materials/terrain.shader
+++ b/files/materials/terrain.shader
@@ -369,7 +369,7 @@
     
     
         float darkness = VISIBILITY*2.0;
-        darkness = clamp((waterEyePos.y - waterLevel + darkness)/darkness,0.2,1.0);
+        darkness = clamp((waterEyePos.z - waterLevel + darkness)/darkness,0.2,1.0);
         watercolour *= darkness;
 
         float isUnderwater = (worldPos.z < waterLevel) ? 1.0 : 0.0;
diff --git a/files/materials/underwater.h b/files/materials/underwater.h
index 3b2540408..a760202fa 100644
--- a/files/materials/underwater.h
+++ b/files/materials/underwater.h
@@ -79,7 +79,7 @@ float3 perturb(shTexture2D tex, float2 coords, float bend, float2 windDir, float
 
 float3 getCaustics (shTexture2D causticMap, float3 worldPos, float3 waterEyePos, float3 worldNormal, float3 lightDirectionWS0, float waterLevel, float waterTimer, float3 windDir_windSpeed)
 {
-    float waterDepth = shSaturate((waterEyePos.y - worldPos.z) / 50.0);
+    float waterDepth = shSaturate((waterEyePos.z - worldPos.z) / 50.0);
 
     float3 causticPos = intercept(worldPos.xyz, lightDirectionWS0.xyz, float3(0,0,1), waterLevel);
     
@@ -91,20 +91,21 @@ float3 getCaustics (shTexture2D causticMap, float3 worldPos, float3 waterEyePos,
     // NOTE: the original shader calculated a tangent space basis here, 
     // but using only the world normal is cheaper and i couldn't see a visual difference
     // also, if this effect gets moved to screen-space some day, it's unlikely to have tangent information
-    float3 causticNorm = worldNormal.xyz * perturb(causticMap, causticPos.xz, causticdepth, windDir_windSpeed.xy, windDir_windSpeed.z, waterTimer).xyz * 2 - 1;
+    float3 causticNorm = worldNormal.xyz * perturb(causticMap, causticPos.xy, causticdepth, windDir_windSpeed.xy, windDir_windSpeed.z, waterTimer).xyz * 2 - 1;
+    causticNorm = float3(causticNorm.x, causticNorm.y, -causticNorm.z);
 
     //float fresnel = pow(clamp(dot(LV,causticnorm),0.0,1.0),2.0); 
     
     float NdotL = max(dot(worldNormal.xyz, lightDirectionWS0.xyz),0.0);
 
-    float causticR = 1.0-perturb(causticMap, causticPos.xz, causticdepth, windDir_windSpeed.xy, windDir_windSpeed.z, waterTimer).z;
+    float causticR = 1.0-perturb(causticMap, causticPos.xy, causticdepth, windDir_windSpeed.xy, windDir_windSpeed.z, waterTimer).z;
 
     /// \todo sunFade
     
    // float3 caustics = clamp(pow(float3(causticR)*5.5,float3(5.5*causticdepth)),0.0,1.0)*NdotL*sunFade*causticdepth;
     float3 caustics = clamp(pow(float3(causticR,causticR,causticR)*5.5,float3(5.5*causticdepth,5.5*causticdepth,5.5*causticdepth)),0.0,1.0)*NdotL*causticdepth;
-    float causticG = 1.0-perturb(causticMap,causticPos.xz+(1.0-causticdepth)*ABBERATION, causticdepth, windDir_windSpeed.xy, windDir_windSpeed.z, waterTimer).z;
-    float causticB = 1.0-perturb(causticMap,causticPos.xz+(1.0-causticdepth)*ABBERATION*2.0, causticdepth, windDir_windSpeed.xy, windDir_windSpeed.z, waterTimer).z;
+    float causticG = 1.0-perturb(causticMap,causticPos.xy+(1.0-causticdepth)*ABBERATION, causticdepth, windDir_windSpeed.xy, windDir_windSpeed.z, waterTimer).z;
+    float causticB = 1.0-perturb(causticMap,causticPos.xy+(1.0-causticdepth)*ABBERATION*2.0, causticdepth, windDir_windSpeed.xy, windDir_windSpeed.z, waterTimer).z;
     //caustics = shSaturate(pow(float3(causticR,causticG,causticB)*5.5,float3(5.5*causticdepth)))*NdotL*sunFade*causticdepth;
                 caustics = shSaturate(pow(float3(causticR,causticG,causticB)*5.5,float3(5.5*causticdepth,5.5*causticdepth,5.5*causticdepth)))*NdotL*causticdepth;