USD Exporter: removed from experimental features

There were two reasons the USD Exporter was listed as experimental:

- Originally there was no deduplication of mesh normals & UV coordinates
 (resolved in rBf5e00f735106b5ec635806a4c795a2bc46ae8369), and
- the way materials were exported was incompatible with instancing with
  USD 19.07. This seems to be resolved with the current version of USD
  (19.11).

Blender (more specifically, `makesdna`) doesn't seem to like empty DNA
structs, so I couldn't remove all properties from
`UserDef_Experimental`. Instead I have just kept `char _pad0[8]`.

Reviewed by: campbellbarton

Differential Revision: https://developer.blender.org/D6519

2 files changed, 1 insertions, 27 deletions

diff --git a/release/scripts/startup/bl_ui/space_topbar.py b/release/scripts/startup/bl_ui/space_topbar.py
index 7dbf49d01e3..fd46bd53cd2 100644
--- a/release/scripts/startup/bl_ui/space_topbar.py
+++ b/release/scripts/startup/bl_ui/space_topbar.py
@@ -471,7 +471,7 @@ class TOPBAR_MT_file_export(Menu):
                                  text="Collada (Default) (.dae)")
         if bpy.app.build_options.alembic:
             self.layout.operator("wm.alembic_export", text="Alembic (.abc)")
-        if bpy.app.build_options.usd and context.preferences.experimental.use_usd_exporter:
+        if bpy.app.build_options.usd:
             self.layout.operator(
                 "wm.usd_export", text="Universal Scene Description (.usd, .usdc, .usda)")
 
diff --git a/release/scripts/startup/bl_ui/space_userpref.py b/release/scripts/startup/bl_ui/space_userpref.py
index b497d688339..4f35bcc29df 100644
--- a/release/scripts/startup/bl_ui/space_userpref.py
+++ b/release/scripts/startup/bl_ui/space_userpref.py
@@ -2118,30 +2118,6 @@ class USERPREF_PT_experimental_virtual_reality(ExperimentalPanel, Panel):
 """
 
 
-class USERPREF_PT_experimental_usd(ExperimentalPanel, Panel):
-    bl_label = "Universal Scene Description"
-
-    @classmethod
-    def poll(cls, context):
-        # Only show the panel if Blender was actually built with USD support.
-        return getattr(bpy.app.build_options, "usd", False)
-
-    def draw(self, context):
-        prefs = context.preferences
-        experimental = prefs.experimental
-
-        layout = self.layout
-        layout.use_property_split = True
-        layout.use_property_decorate = False
-
-        split = layout.split(factor=0.66)
-        col = split.split()
-        col.prop(experimental, "use_usd_exporter", text="USD Exporter")
-        col = split.split()
-        url = "https://devtalk.blender.org/t/universal-scene-description-usd-exporter-feedback/10920"
-        col.operator("wm.url_open", text='Give Feedback', icon='URL').url = url
-
-
 # -----------------------------------------------------------------------------
 # Class Registration
 
@@ -2226,8 +2202,6 @@ classes = (
     USERPREF_PT_studiolight_matcaps,
     USERPREF_PT_studiolight_world,
 
-    USERPREF_PT_experimental_usd,
-
     # Popovers.
     USERPREF_PT_ndof_settings,