Add 'small feature culling pixel size' setting specifically for water RTTs, by default set higher than the one in [Camera]

apps/openmw/mwrender/water.cpp

@@ -222,6 +222,7 @@ public:
         setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
         setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT);
         setReferenceFrame(osg::Camera::RELATIVE_RF);
+        setSmallFeatureCullingPixelSize(Settings::Manager::getInt("small feature culling pixel size", "Water"));
 
         setCullMask(Mask_Effect|Mask_Scene|Mask_Terrain|Mask_Actor|Mask_ParticleSystem|Mask_Sky|Mask_Sun|Mask_Player|Mask_Lighting);
         setNodeMask(Mask_RenderToTexture);
@@ -303,6 +304,7 @@ public:
         setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
         setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT);
         setReferenceFrame(osg::Camera::RELATIVE_RF);
+        setSmallFeatureCullingPixelSize(Settings::Manager::getInt("small feature culling pixel size", "Water"));
 
         bool reflectActors = Settings::Manager::getBool("reflect actors", "Water");
 

docs/source/openmw-mods/settings/water.rst

@@ -40,4 +40,19 @@ This boolean setting enables the refraction rendering feature of the water shade
 
 This setting has no effect if the shader setting is false.
 
-The default setting is false. This setting can be toggled with the Refraction button in the Water tab of the Video panel of the Options menu.
+The default setting is false. This setting can be toggled with the Refraction button in the Water tab of the Video panel of the Options menu.
+
+small feature culling pixel size
+--------------------------------
+
+:Type:		floating point
+:Range:		> 0
+:Default:	20.0
+
+Controls the cutoff in pixels for small feature culling - see the 'Camera' section for more details, however this setting in the 'Water' section applies specifically to objects rendered in water reflection and refraction textures.
+
+The setting 'rtt size' interacts with this setting because it controls how large a pixel on the water texture (technically called a texel) is in pixels on the screen.
+
+This setting will have no effect if the shader setting is false, or the 'small feature culling' (in the 'Camera' section) is disabled.
+
+This setting can only be configured by editing the settings configuration file.

files/settings-default.cfg

@@ -340,6 +340,9 @@ refraction = false
 # Draw NPCs and creatures on water reflections.
 reflect actors = false
 
+# Overrides the value in '[Camera] small feature culling pixel size' specifically for water reflection/refraction textures.
+small feature culling pixel size = 20.0
+
 [Windows]
 
 # Location and sizes of windows as a fraction of the OpenMW window or