Geometry Nodes: Curve Trim Node

This node implements shortening each spline in the curve based on
either a length from the start of each spline, or a factor of the
total length of each spline, similar to the "Start & End Mapping"
panel of curve properties.

For Bezier curves, the first and last control points are adjusted
to maintain the shape of the curve, but NURB splines are currently
implicitly converted to poly splines.

The node is implemented to avoid copying where possible, so it outputs
a changed version of the input curve rather than a new one.

Differential Revision: https://developer.blender.org/D11901

2 files changed, 2 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_node.h b/source/blender/blenkernel/BKE_node.h
index 63b11a194ff..9b8eca77e6b 100644
--- a/source/blender/blenkernel/BKE_node.h
+++ b/source/blender/blenkernel/BKE_node.h
@@ -1464,6 +1464,7 @@ int ntreeTexExecTree(struct bNodeTree *ntree,
 #define GEO_NODE_CURVE_PRIMITIVE_LINE 1068
 #define GEO_NODE_CURVE_ENDPOINTS 1069
 #define GEO_NODE_CURVE_PRIMITIVE_QUADRILATERAL 1070
+#define GEO_NODE_CURVE_TRIM 1071
 
 /** \} */
 
diff --git a/source/blender/blenkernel/intern/node.cc b/source/blender/blenkernel/intern/node.cc
index 85d30fc8c8b..3d5973b1d5e 100644
--- a/source/blender/blenkernel/intern/node.cc
+++ b/source/blender/blenkernel/intern/node.cc
@@ -5120,6 +5120,7 @@ static void registerGeometryNodes()
   register_node_type_geo_curve_subdivide();
   register_node_type_geo_curve_to_mesh();
   register_node_type_geo_curve_to_points();
+  register_node_type_geo_curve_trim();
   register_node_type_geo_delete_geometry();
   register_node_type_geo_edge_split();
   register_node_type_geo_input_material();