node_geo_edge_split.cc

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/* SPDX-FileCopyrightText: 2023 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#include "DNA_mesh_types.h"
 
#include "GEO_mesh_split_edges.hh"
 
#include "node_geometry_util.hh"
 
namespace blender::nodes::node_geo_edge_split_cc {
 
static void node_declare(NodeDeclarationBuilder &b)
{
  b.use_custom_socket_order();
  b.allow_any_socket_order();
  b.add_input<decl::Geometry>("Mesh").supported_type(GeometryComponent::Type::Mesh);
  b.add_output<decl::Geometry>("Mesh").propagate_all().align_with_previous();
  b.add_input<decl::Bool>("Selection").default_value(true).hide_value().field_on_all();
}
 
static void node_geo_exec(GeoNodeExecParams params)
{
  GeometrySet geometry_set = params.extract_input<GeometrySet>("Mesh");
 
  const Field<bool> selection_field = params.extract_input<Field<bool>>("Selection");
 
  geometry_set.modify_geometry_sets([&](GeometrySet &geometry_set) {
    if (const Mesh *mesh = geometry_set.get_mesh()) {
      const bke::MeshFieldContext field_context{*mesh, AttrDomain::Edge};
      fn::FieldEvaluator selection_evaluator{field_context, mesh->edges_num};
      selection_evaluator.set_selection(selection_field);
      selection_evaluator.evaluate();
      const IndexMask mask = selection_evaluator.get_evaluated_selection_as_mask();
      if (mask.is_empty()) {
        return;
      }
 
      geometry::split_edges(
          *geometry_set.get_mesh_for_write(), mask, params.get_attribute_filter("Mesh"));
    }
  });
 
  params.set_output("Mesh", std::move(geometry_set));
}
 
static void node_register()
{
  static blender::bke::bNodeType ntype;
 
  geo_node_type_base(&ntype, "GeometryNodeSplitEdges", GEO_NODE_SPLIT_EDGES);
  ntype.ui_name = "Split Edges";
  ntype.ui_description = "Duplicate mesh edges and break connections with the surrounding faces";
  ntype.enum_name_legacy = "SPLIT_EDGES";
  ntype.nclass = NODE_CLASS_GEOMETRY;
  ntype.geometry_node_execute = node_geo_exec;
  ntype.declare = node_declare;
  blender::bke::node_register_type(ntype);
}
NOD_REGISTER_NODE(node_register)
 
}  // namespace blender::nodes::node_geo_edge_split_cc