Geometry Nodes: Flip Faces Node

Currently there is no way to flip normals in geometry nodes. This node
makes that possible by flipping the winding order of selected faces.
The node is purposely not called "Flip Normals", because normals are
derived data, changing them is only a side effect. The real change is
that the vertex and edge indices in the face corners of every selected
polygon are reversed, and face corner attribute data is reversed.

While there are existing utilities to flip a polygon and its custom
data, this node aims to process an attribute's data together instead
of processing all attributes separately for each index.

Differential Revision: https://developer.blender.org/D13809

1 files changed, 1 insertions, 0 deletions

diff --git a/source/blender/nodes/NOD_geometry.h b/source/blender/nodes/NOD_geometry.h
index 1548ba32abc..ff4036308c6 100644
--- a/source/blender/nodes/NOD_geometry.h
+++ b/source/blender/nodes/NOD_geometry.h
@@ -100,6 +100,7 @@ void register_node_type_geo_distribute_points_on_faces(void);
 void register_node_type_geo_dual_mesh(void);
 void register_node_type_geo_edge_split(void);
 void register_node_type_geo_field_at_index(void);
+void register_node_type_geo_flip_faces(void);
 void register_node_type_geo_geometry_to_instance(void);
 void register_node_type_geo_image_texture(void);
 void register_node_type_geo_input_curve_handles(void);