Merge pull request godotengine#8604 from Calinou/fog-banding

Mention potential banding issues in fog and volumetric fog documentation

Author: mhilbrunner

tutorials/3d/environment_and_post_processing.rst

@@ -301,6 +301,12 @@ In practice, it makes light stand out more across the fog.
 
 .. image:: img/environment_fog_transmission.webp
 
+.. note::
+
+    Fog can cause banding to appear on the viewport, especially at
+    higher density levels. See :ref:`doc_3d_rendering_limitations_color_banding`
+    for guidance on reducing banding.
+
 Volumetric Fog
 ^^^^^^^^^^^^^^
 

tutorials/3d/volumetric_fog.rst

@@ -149,6 +149,12 @@ and quality:
   the fog which reduces fine details but also smooths out harsh edges and
   aliasing artifacts. Disable when more detail is required.
 
+.. note::
+
+    Volumetric fog can cause banding to appear on the viewport, especially at
+    higher density levels. See :ref:`doc_3d_rendering_limitations_color_banding`
+    for guidance on reducing banding.
+
 Using fog volumes for local volumetric fog
 ------------------------------------------