Differential D12579 Diff 43279 source/blender/nodes/geometry/nodes/node_geo_mesh_to_curve.cc

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source/blender/nodes/geometry/nodes/node_geo_mesh_to_curve.cc

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				/*
				* This program is free software; you can redistribute it and/or
				* modify it under the terms of the GNU General Public License
				* as published by the Free Software Foundation; either version 2
				* of the License, or (at your option) any later version.
				*
				* This program is distributed in the hope that it will be useful,
				* but WITHOUT ANY WARRANTY; without even the implied warranty of
				* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
				* GNU General Public License for more details.
				*
				* You should have received a copy of the GNU General Public License
				* along with this program; if not, write to the Free Software Foundation,
				* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
				*/

				#include "GEO_mesh_to_curve.hh"

				#include "node_geometry_util.hh"

				namespace blender::nodes {

				static void geo_node_legacy_mesh_to_curve_declare(NodeDeclarationBuilder &b)
				{
				b.add_input<decl::Geometry>("Mesh");
				b.add_input<decl::Bool>("Selection").default_value(true).hide_value().supports_field();
				b.add_output<decl::Geometry>("Curve");
				}

				static void geo_node_legacy_mesh_to_curve_exec(GeoNodeExecParams params)
				{
				GeometrySet geometry_set = params.extract_input<GeometrySet>("Mesh");

				geometry_set.modify_geometry_sets([&](GeometrySet &geometry_set) {
				if (!geometry_set.has_mesh()) {
				geometry_set.keep_only({GEO_COMPONENT_TYPE_INSTANCES});
				return;
				}

				const MeshComponent &component = *geometry_set.get_component_for_read<MeshComponent>();
				GeometryComponentFieldContext context{component, ATTR_DOMAIN_EDGE};
				fn::FieldEvaluator evaluator{context, component.attribute_domain_size(ATTR_DOMAIN_EDGE)};
				evaluator.add(params.get_input<Field<bool>>("Selection"));
				evaluator.evaluate();
				const IndexMask selection = evaluator.get_evaluated_as_mask(0);
				if (selection.size() == 0) {
				geometry_set.keep_only({GEO_COMPONENT_TYPE_INSTANCES});
				return;
				}

				std::unique_ptr<CurveEval> curve = geometry::mesh_to_curve_convert(component, selection);
				geometry_set.replace_curve(curve.release());
				geometry_set.keep_only({GEO_COMPONENT_TYPE_CURVE, GEO_COMPONENT_TYPE_INSTANCES});
				});

				params.set_output("Curve", std::move(geometry_set));
				}

				} // namespace blender::nodes

				void register_node_type_geo_mesh_to_curve()
				{
				static bNodeType ntype;

				geo_node_type_base(&ntype, GEO_NODE_MESH_TO_CURVE, "Mesh to Curve", NODE_CLASS_GEOMETRY, 0);
				ntype.declare = blender::nodes::geo_node_legacy_mesh_to_curve_declare;
				ntype.geometry_node_execute = blender::nodes::geo_node_legacy_mesh_to_curve_exec;
				nodeRegisterType(&ntype);
				}