Geometry Nodes: Expose "shade smooth" as an attribute

This patch exposes the "Shade Smooth" value as a boolean attribute.
This setting is exposed as a check-box in the mesh data properties,
but the value is actually stored for every face, allowing some faces
to be shaded smooth with a simple per-face control.

One bonus, this allows at least a workaround to the lack of control
of whether meshes created by nodes are shaded smooth or not: just use
an attribute fill node.

Differential Revision: https://developer.blender.org/D10538

1 files changed, 4 insertions, 2 deletions

diff --git a/source/blender/blenkernel/intern/geometry_set_instances.cc b/source/blender/blenkernel/intern/geometry_set_instances.cc
index 6c4c3231667..f3006385da3 100644
--- a/source/blender/blenkernel/intern/geometry_set_instances.cc
+++ b/source/blender/blenkernel/intern/geometry_set_instances.cc
@@ -378,8 +378,10 @@ static void join_instance_groups_mesh(Span<GeometryInstanceGroup> set_groups,
 
   /* Don't copy attributes that are stored directly in the mesh data structs. */
   Map<std::string, AttributeKind> attributes;
-  gather_attribute_info(
-      attributes, component_types, set_groups, {"position", "material_index", "vertex_normal"});
+  gather_attribute_info(attributes,
+                        component_types,
+                        set_groups,
+                        {"position", "material_index", "vertex_normal", "shade_smooth"});
   join_attributes(
       set_groups, component_types, attributes, static_cast<GeometryComponent &>(dst_component));
 }