Geometry Nodes: Curve Set Spline Type

This node sets the selected (or all) splines in curve to a chosen target
spline type. Poly, Bezier, and NURB splines can be converted to any of
the other types. This is meant to be a building block node, useful in
many procedural situations.

In the future the node could be optimized with multi-threading, or by
avoiding copying in many cases, either by retrieving the curve for write
access or by passing the raw vectors to the new splines where possible.

With edits from Hans Goudey (@HooglyBoogly)

Differential Revision: https://developer.blender.org/D12013

1 files changed, 17 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_nodetree.c b/source/blender/makesrna/intern/rna_nodetree.c
index 3d4256db335..cd7cbbf76d3 100644
--- a/source/blender/makesrna/intern/rna_nodetree.c
+++ b/source/blender/makesrna/intern/rna_nodetree.c
@@ -9441,6 +9441,23 @@ static void def_geo_attribute_vector_rotate(StructRNA *srna)
   RNA_def_property_update(prop, NC_NODE | NA_EDITED, "rna_Node_socket_update");
 }
 
+static void def_geo_curve_spline_type(StructRNA *srna)
+{
+  static const EnumPropertyItem type_items[] = {
+      {GEO_NODE_SPLINE_TYPE_BEZIER, "BEZIER", ICON_NONE, "Bezier", "Set the splines to Bezier"},
+      {GEO_NODE_SPLINE_TYPE_NURBS, "NURBS", ICON_NONE, "NURBS", "Set the splines to NURBS"},
+      {GEO_NODE_SPLINE_TYPE_POLY, "POLY", ICON_NONE, "Poly", "Set the splines to Poly"},
+      {0, NULL, 0, NULL, NULL}};
+
+  PropertyRNA *prop;
+  RNA_def_struct_sdna_from(srna, "NodeGeometryCurveSplineType", "storage");
+
+  prop = RNA_def_property(srna, "spline_type", PROP_ENUM, PROP_NONE);
+  RNA_def_property_enum_sdna(prop, NULL, "spline_type");
+  RNA_def_property_enum_items(prop, type_items);
+  RNA_def_property_update(prop, NC_NODE | NA_EDITED, "rna_Node_socket_update");
+}
+
 static void def_geo_curve_set_handles(StructRNA *srna)
 {
   static const EnumPropertyItem type_items[] = {