Geometry Nodes: Copy parameters when copying a curves data-block

Previously, things like materials, symmetry, and selection options
stored on `Curves` weren't copied to the result in nodes like the
subdivide and resample nodes. Now they are, which fixes some
unexpected behavior and allows visualization of the sculpt mode
selection.

In the realize instances and join nodes the behavior is the same as
for meshes, the parameters are taken from the first (top) input.

I also refactored some functions to return a `CurvesGeometry` by-value,
which makes it the responsibility of the node to copy the parameters.
That should make the algorithms more reusable in other situations.

Differential Revision: https://developer.blender.org/D15408

1 files changed, 6 insertions, 6 deletions

diff --git a/source/blender/geometry/GEO_mesh_to_curve.hh b/source/blender/geometry/GEO_mesh_to_curve.hh
index c480e4178cf..f619aaff217 100644
--- a/source/blender/geometry/GEO_mesh_to_curve.hh
+++ b/source/blender/geometry/GEO_mesh_to_curve.hh
@@ -1,12 +1,12 @@
 /* SPDX-License-Identifier: GPL-2.0-or-later */
 
+#pragma once
+
 #include "BLI_index_mask.hh"
 
-#pragma once
+#include "BKE_curves.hh"
 
 struct Mesh;
-struct Curves;
-class MeshComponent;
 
 /** \file
  * \ingroup geo
@@ -15,10 +15,10 @@ class MeshComponent;
 namespace blender::geometry {
 
 /**
- * Convert the mesh into one or many poly splines. Since splines cannot have branches,
- * intersections of more than three edges will become breaks in splines. Attributes that
+ * Convert the mesh into one or many poly curves. Since curves cannot have branches,
+ * intersections of more than three edges will become breaks in curves. Attributes that
  * are not built-in on meshes and not curves are transferred to the result curve.
  */
-Curves *mesh_to_curve_convert(const MeshComponent &mesh_component, const IndexMask selection);
+bke::CurvesGeometry mesh_to_curve_convert(const Mesh &mesh, const IndexMask selection);
 
 }  // namespace blender::geometry