Geometry Nodes: Add Curve Subdivision Node

This node creates splines with more control points in between the
existing control points. The point is to give the splines more
definition for further tweaking like randomization with white noise,
instead of deforming a resampled poly spline with a noise texture.

For poly splines and NURBS, the node simply interpolates new values
between the existing control points. However, for Bezier splines,
the result follows the existing evaluated shape of the curve, changing
the handle positions and handle types to make that possible.

The number of "cuts" can be controlled by an integer input, or an
attribute can be used. Both spline and point domain attributes are
supported, so the number of cuts can vary using the value from the
point at the start of each segment.

Dynamic curve attributes are interpolated to the result with linear
interpolation.

Differential Revision: https://developer.blender.org/D11421

1 files changed, 12 insertions, 2 deletions

diff --git a/source/blender/makesrna/intern/rna_nodetree.c b/source/blender/makesrna/intern/rna_nodetree.c
index 17ff997e0df..b96400cda91 100644
--- a/source/blender/makesrna/intern/rna_nodetree.c
+++ b/source/blender/makesrna/intern/rna_nodetree.c
@@ -502,13 +502,11 @@ static const EnumPropertyItem rna_node_geometry_attribute_input_type_items_float
     ITEM_FLOAT,
     {0, NULL, 0, NULL, NULL},
 };
-#  if 0 /* UNUSED */
 static const EnumPropertyItem rna_node_geometry_attribute_input_type_items_int[] = {
     ITEM_ATTRIBUTE,
     ITEM_INTEGER,
     {0, NULL, 0, NULL, NULL},
 };
-#  endif
 static const EnumPropertyItem rna_node_geometry_attribute_input_type_items_no_boolean[] = {
     ITEM_ATTRIBUTE,
     ITEM_FLOAT,
@@ -9861,6 +9859,18 @@ static void def_geo_curve_resample(StructRNA *srna)
   RNA_def_property_update(prop, NC_NODE | NA_EDITED, "rna_Node_socket_update");
 }
 
+static void def_geo_curve_subdivide(StructRNA *srna)
+{
+  PropertyRNA *prop;
+
+  RNA_def_struct_sdna_from(srna, "NodeGeometryCurveSubdivide", "storage");
+
+  prop = RNA_def_property(srna, "cuts_type", PROP_ENUM, PROP_NONE);
+  RNA_def_property_enum_items(prop, rna_node_geometry_attribute_input_type_items_int);
+  RNA_def_property_ui_text(prop, "Cuts Type", "");
+  RNA_def_property_update(prop, NC_NODE | NA_EDITED, "rna_Node_socket_update");
+}
+
 static void def_geo_curve_to_points(StructRNA *srna)
 {
   PropertyRNA *prop;