#731 Fix for divide by zero when haze density set to zero (#1085)

indra/newview/app_settings/shaders/class1/deferred/skyV.glsl

@@ -98,7 +98,7 @@ void main()
     vec3 light_atten = (blue_density + vec3(haze_density * 0.25)) * (density_multiplier * max_y);
 
     // Calculate relative weights
-    vec3 combined_haze = abs(blue_density) + vec3(abs(haze_density));
+    vec3 combined_haze = max(abs(blue_density) + vec3(abs(haze_density)), vec3(1e-6));
     vec3 blue_weight   = blue_density / combined_haze;
     vec3 haze_weight   = haze_density / combined_haze;
 

indra/newview/app_settings/shaders/class1/windlight/atmosphericsFuncs.glsl

@@ -66,7 +66,7 @@ void calcAtmosphericVars(vec3 inPositionEye, vec3 light_dir, float ambFactor, ou
     // I had thought blue_density and haze_density should have equal weighting,
     // but attenuation due to haze_density tends to seem too strong
 
-    vec3 combined_haze = blue_density + vec3(haze_density);
+    vec3 combined_haze = max(blue_density + vec3(haze_density), vec3(1e-6));
     vec3 blue_weight   = blue_density / combined_haze;
     vec3 haze_weight   = vec3(haze_density) / combined_haze;