[Bf-docboard-svn] bf-manual: [9652] trunk/blender_docs/manual: Update subdivision surface behavior of Non-Contiguous Normals

[Aaron Carlisle]

Revision: 9652
          https://developer.blender.org/rBM9652
Author:   Blendify
Date:     2022-10-23 23:00:24 +0200 (Sun, 23 Oct 2022)
Log Message:
-----------
Update subdivision surface behavior of Non-Contiguous Normals

Blender now only uses a simple subdivision rather than creating shading artifacts.

Fixes T101900

Modified Paths:
--------------
    trunk/blender_docs/manual/images/modeling_modifiers_generate_subdivision-surface_normal-orientation-1.png
    trunk/blender_docs/manual/modeling/modifiers/generate/subdivision_surface.rst

Modified: trunk/blender_docs/manual/images/modeling_modifiers_generate_subdivision-surface_normal-orientation-1.png
===================================================================
(Binary files differ)

Modified: trunk/blender_docs/manual/modeling/modifiers/generate/subdivision_surface.rst
===================================================================
--- trunk/blender_docs/manual/modeling/modifiers/generate/subdivision_surface.rst	2022-10-23 19:42:46 UTC (rev 9651)
+++ trunk/blender_docs/manual/modeling/modifiers/generate/subdivision_surface.rst	2022-10-23 21:00:24 UTC (rev 9652)
@@ -123,6 +123,7 @@
 
 Use Custom Normals
    Interpolates existing :ref:`modeling_meshes_normals_custom` of the resulting mesh.
+   Otherwise, new faces will have the overall normal orientation of that original face.
 
 
 Keyboard Shortcuts
@@ -184,9 +185,8 @@
 Non-Contiguous Normals
 ----------------------
 
-Blender's subdivision system produces nice smooth subdivided meshes, but any subdivided face
-(that is, any small face created by the algorithm from a single face of the original mesh),
-shares the overall normal orientation of that original face.
+Abrupt normal changes will prevent portions of the mesh from producing a smooth subdivision.
+Instead, these portions with non-contiguous normals will be subdivided using the "Simple" subdivision method.
 
 .. list-table::
 
@@ -200,11 +200,5 @@
 
           Side view of image on the left.
 
-Abrupt normal changes can produce ugly black gouges even though
-these flipped normals are not an issue for the shape itself.
-
-A quick way to fix this is to use Blender's
-:doc:`Recalculate Normals </modeling/meshes/editing/mesh/normals>` operation in Edit Mode.
-
-If you still have some ugly black gouges you will have to
-:doc:`manually flip the normals </modeling/meshes/editing/mesh/normals>`.
+A quick way to fix this is to :doc:`Recalculate Normals </modeling/meshes/editing/mesh/normals>`.
+If this does not work you may have to :doc:`manually flip the normals </modeling/meshes/editing/mesh/normals>`.