Geometry Nodes: Add Mesh to Curve Node

This node creates poly curve splines from mesh edges. A selection
attribute input allows only using some of the edges from the mesh.
The node builds cyclic splines from branchless groups of edges where
possible, but when there is a three-way intersection, the spline stops.

The node also transfers all attributes from the mesh to the resulting
control points. In the future we could add a way to limit that to a
subset of the attributes to improve performance.

The algorithm is from Animation Nodes, written by @OmarSquircleArt.
I added the ability to use a selection, attribute transferring, and
used different variable names, etc, but other than that the algorithm
is the same.

Differential Revision: https://developer.blender.org/D11265

1 files changed, 1 insertions, 0 deletions

diff --git a/source/blender/nodes/NOD_geometry.h b/source/blender/nodes/NOD_geometry.h
index d2a702c30a6..eadfed26be1 100644
--- a/source/blender/nodes/NOD_geometry.h
+++ b/source/blender/nodes/NOD_geometry.h
@@ -66,6 +66,7 @@ void register_node_type_geo_mesh_primitive_grid(void);
 void register_node_type_geo_mesh_primitive_ico_sphere(void);
 void register_node_type_geo_mesh_primitive_line(void);
 void register_node_type_geo_mesh_primitive_uv_sphere(void);
+void register_node_type_geo_mesh_to_curve(void);
 void register_node_type_geo_object_info(void);
 void register_node_type_geo_point_distribute(void);
 void register_node_type_geo_point_instance(void);