Geometry Nodes: Add "Fill Caps" option to curve to mesh node

This adds an option to fill the ends of the generated mesh for
each spline combination with an N-gon. The resulting mesh is
manifold, so it can be used for operations like Boolean.

Differential Revision: https://developer.blender.org/D12982

1 files changed, 11 insertions, 4 deletions

diff --git a/source/blender/nodes/geometry/nodes/node_geo_curve_to_mesh.cc b/source/blender/nodes/geometry/nodes/node_geo_curve_to_mesh.cc
index 00451946af9..be755c7269e 100644
--- a/source/blender/nodes/geometry/nodes/node_geo_curve_to_mesh.cc
+++ b/source/blender/nodes/geometry/nodes/node_geo_curve_to_mesh.cc
@@ -29,19 +29,25 @@ static void geo_node_curve_to_mesh_declare(NodeDeclarationBuilder &b)
 {
   b.add_input<decl::Geometry>("Curve");
   b.add_input<decl::Geometry>("Profile Curve");
+  b.add_input<decl::Bool>("Fill Caps")
+      .description(
+          "If the profile spline is cyclic, fill the ends of the generated mesh with N-gons");
   b.add_output<decl::Geometry>("Mesh");
 }
 
-static void geometry_set_curve_to_mesh(GeometrySet &geometry_set, const GeometrySet &profile_set)
+static void geometry_set_curve_to_mesh(GeometrySet &geometry_set,
+                                       const GeometrySet &profile_set,
+                                       const bool fill_caps)
 {
+  const CurveEval *curve = geometry_set.get_curve_for_read();
   const CurveEval *profile_curve = profile_set.get_curve_for_read();
 
   if (profile_curve == nullptr) {
-    Mesh *mesh = bke::curve_to_wire_mesh(*geometry_set.get_curve_for_read());
+    Mesh *mesh = bke::curve_to_wire_mesh(*curve);
     geometry_set.replace_mesh(mesh);
   }
   else {
-    Mesh *mesh = bke::curve_to_mesh_sweep(*geometry_set.get_curve_for_read(), *profile_curve);
+    Mesh *mesh = bke::curve_to_mesh_sweep(*curve, *profile_curve, fill_caps);
     geometry_set.replace_mesh(mesh);
   }
 }
@@ -50,6 +56,7 @@ static void geo_node_curve_to_mesh_exec(GeoNodeExecParams params)
 {
   GeometrySet curve_set = params.extract_input<GeometrySet>("Curve");
   GeometrySet profile_set = params.extract_input<GeometrySet>("Profile Curve");
+  const bool fill_caps = params.extract_input<bool>("Fill Caps");
 
   if (profile_set.has_instances()) {
     params.error_message_add(NodeWarningType::Error,
@@ -67,7 +74,7 @@ static void geo_node_curve_to_mesh_exec(GeoNodeExecParams params)
   curve_set.modify_geometry_sets([&](GeometrySet &geometry_set) {
     if (geometry_set.has_curve()) {
       has_curve = true;
-      geometry_set_curve_to_mesh(geometry_set, profile_set);
+      geometry_set_curve_to_mesh(geometry_set, profile_set, fill_caps);
     }
     geometry_set.keep_only({GEO_COMPONENT_TYPE_MESH, GEO_COMPONENT_TYPE_INSTANCES});
   });