2 files changed, 19 insertions, 5 deletions
diff --git a/indra/newview/app_settings/settings.xml b/indra/newview/app_settings/settings.xml
index 8b5e92f704..bd49f003c5 100644
--- a/indra/newview/app_settings/settings.xml
+++ b/indra/newview/app_settings/settings.xml
@@ -7227,6 +7227,17 @@
         <key>Value</key>
         <integer>1</integer>
     </map>
+    <key>RenderCanUseTerrainBakeShaders</key>
+    <map>
+        <key>Comment</key>
+        <string>Hardware has support for Terrain Bake shaders</string>
+        <key>Persist</key>
+        <integer>0</integer>
+        <key>Type</key>
+        <string>Boolean</string>
+        <key>Value</key>
+        <integer>1</integer>
+    </map>
   <key>RenderClass1MemoryBandwidth</key>
   <map>
     <key>Comment</key>
@@ -9435,7 +9446,7 @@
       <key>Comment</key>
       <string>EXPERIMENTAL: Enable PBR Terrain texture transforms.</string>
       <key>Persist</key>
-      <integer>1</integer>
+      <integer>0</integer>
       <key>Type</key>
       <string>Boolean</string>
       <key>Value</key>
diff --git a/indra/newview/app_settings/shaders/class1/deferred/deferredUtil.glsl b/indra/newview/app_settings/shaders/class1/deferred/deferredUtil.glsl
index 5193a46ac2..8588a93648 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/deferredUtil.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/deferredUtil.glsl
@@ -99,10 +99,13 @@ void calcHalfVectors(vec3 lv, vec3 n, vec3 v,
 {
     l  = normalize(lv);
     h  = normalize(l + v);
-    nh = clamp(dot(n, h), 0.0, 1.0);
-    nl = clamp(dot(n, l), 0.0, 1.0);
-    nv = clamp(dot(n, v), 0.0, 1.0);
-    vh = clamp(dot(v, h), 0.0, 1.0);
+
+    // lower bound to avoid divide by zero
+    float eps = 0.000001;
+    nh = clamp(dot(n, h), eps, 1.0);
+    nl = clamp(dot(n, l), eps, 1.0);
+    nv = clamp(dot(n, v), eps, 1.0);
+    vh = clamp(dot(v, h), eps, 1.0);
 
     lightDist = length(lv);
 }