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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "BKE_mesh.h"
#include "node_geometry_util.hh"
namespace blender::nodes::node_geo_mesh_face_set_boundaries_cc {
static void node_declare(NodeDeclarationBuilder &b)
{
b.add_input<decl::Int>(N_("Face Set"))
.default_value(0)
.hide_value()
.supports_field()
.description(N_("An identifier for the group of each face. All contiguous faces with the "
"same value are in the same region"));
b.add_output<decl::Bool>(N_("Boundary Edges"))
.field_source()
.description(N_("The edges that lie on the boundaries between the different face sets"));
}
class BoundaryFieldInput final : public bke::MeshFieldInput {
private:
const Field<int> face_set;
public:
BoundaryFieldInput(const Field<int> face_set)
: bke::MeshFieldInput(CPPType::get<bool>(), "Boundary Field"), face_set(face_set)
{
category_ = Category::Generated;
}
GVArray get_varray_for_context(const Mesh &mesh,
const eAttrDomain domain,
const IndexMask /*mask*/) const final
{
const bke::MeshFieldContext face_context{mesh, ATTR_DOMAIN_FACE};
FieldEvaluator face_evaluator{face_context, mesh.totpoly};
face_evaluator.add(face_set);
face_evaluator.evaluate();
const VArray<int> face_set = face_evaluator.get_evaluated<int>(0);
Array<bool> boundary(mesh.totedge, false);
Array<bool> edge_visited(mesh.totedge, false);
Array<int> edge_face_set(mesh.totedge, 0);
const Span<MPoly> polys = mesh.polys();
const Span<MLoop> loops = mesh.loops();
for (const int i : polys.index_range()) {
const MPoly &poly = polys[i];
for (const MLoop &loop : loops.slice(poly.loopstart, poly.totloop)) {
const int edge = loop.e;
if (edge_visited[edge]) {
if (edge_face_set[edge] != face_set[i]) {
/* This edge is connected to two faces on different face sets. */
boundary[edge] = true;
}
}
edge_visited[edge] = true;
edge_face_set[edge] = face_set[i];
}
}
return mesh.attributes().adapt_domain<bool>(
VArray<bool>::ForContainer(std::move(boundary)), ATTR_DOMAIN_EDGE, domain);
}
};
static void node_geo_exec(GeoNodeExecParams params)
{
const Field<int> face_set_field = params.extract_input<Field<int>>("Face Set");
Field<bool> face_set_boundaries{std::make_shared<BoundaryFieldInput>(face_set_field)};
params.set_output("Boundary Edges", std::move(face_set_boundaries));
}
} // namespace blender::nodes::node_geo_mesh_face_set_boundaries_cc
void register_node_type_geo_mesh_face_set_boundaries()
{
namespace file_ns = blender::nodes::node_geo_mesh_face_set_boundaries_cc;
static bNodeType ntype;
geo_node_type_base(
&ntype, GEO_NODE_MESH_FACE_SET_BOUNDARIES, "Face Set Boundaries", NODE_CLASS_INPUT);
ntype.declare = file_ns::node_declare;
ntype.geometry_node_execute = file_ns::node_geo_exec;
nodeRegisterType(&ntype);
}
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