Differential D12689 Diff 42663 source/blender/nodes/geometry/nodes/node_geo_points_to_vertices.cc

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source/blender/nodes/geometry/nodes/node_geo_points_to_vertices.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 "BLI_task.hh"

				#include "BKE_attribute_math.hh"
				#include "BKE_mesh.h"

				#include "node_geometry_util.hh"

				using blender::Array;

				namespace blender::nodes {

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

				template<typename T>
				static void copy_attribute_to_vertices(const Span<T> src, const IndexMask mask, MutableSpan<T> dst)
				{
				for (const int i : mask.index_range()) {
				dst[i] = src[mask[i]];
				}
				}

				/* One improvement would be to move the attribute arrays directly to the mesh when possible. */
				static void geometry_set_points_to_vertices(GeometrySet &geometry_set,
				Field<bool> &selection_field)
				{
				const PointCloudComponent *point_component =
				geometry_set.get_component_for_read<PointCloudComponent>();
				if (point_component == nullptr) {
				geometry_set.keep_only({GEO_COMPONENT_TYPE_INSTANCES});
				return;
				}

				GeometryComponentFieldContext field_context{*point_component, ATTR_DOMAIN_POINT};
				const int domain_size = point_component->attribute_domain_size(ATTR_DOMAIN_POINT);
				if (domain_size == 0) {
				geometry_set.keep_only({GEO_COMPONENT_TYPE_INSTANCES});
				return;
				}

				fn::FieldEvaluator selection_evaluator{field_context, domain_size};
				selection_evaluator.add(selection_field);
				selection_evaluator.evaluate();
				const IndexMask selection = selection_evaluator.get_evaluated_as_mask(0);

				Map<AttributeIDRef, AttributeKind> attributes;
				geometry_set.gather_attributes_for_propagation(
				{GEO_COMPONENT_TYPE_POINT_CLOUD}, GEO_COMPONENT_TYPE_MESH, false, attributes);

				Mesh *mesh = BKE_mesh_new_nomain(selection.size(), 0, 0, 0, 0);
				geometry_set.replace_mesh(mesh);
				MeshComponent &mesh_component = geometry_set.get_component_for_write<MeshComponent>();

				for (Map<AttributeIDRef, AttributeKind>::Item entry : attributes.items()) {
				const AttributeIDRef attribute_id = entry.key;
				const CustomDataType data_type = entry.value.data_type;
				GVArrayPtr src = point_component->attribute_get_for_read(
				attribute_id, ATTR_DOMAIN_POINT, data_type);
				OutputAttribute dst = mesh_component.attribute_try_get_for_output_only(
				attribute_id, ATTR_DOMAIN_POINT, data_type);
				if (dst && src) {
				attribute_math::convert_to_static_type(data_type, [&](auto dummy) {
				using T = decltype(dummy);
				GVArray_Typed<T> src_typed{*src};
				VArray_Span<T> src_typed_span{*src_typed};
				copy_attribute_to_vertices(src_typed_span, selection, dst.as_span().typed<T>());
				});
				dst.save();
				}
				}

				geometry_set.keep_only({GEO_COMPONENT_TYPE_MESH, GEO_COMPONENT_TYPE_INSTANCES});
				}

				static void geo_node_points_to_vertices_exec(GeoNodeExecParams params)
				{
				GeometrySet geometry_set = params.extract_input<GeometrySet>("Points");
				Field<bool> selection_field = params.extract_input<Field<bool>>("Selection");

				geometry_set.modify_geometry_sets([&](GeometrySet &geometry_set) {
				geometry_set_points_to_vertices(geometry_set, selection_field);
				});

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

				} // namespace blender::nodes

				void register_node_type_geo_points_to_vertices()
				{
				static bNodeType ntype;

				geo_node_type_base(
				&ntype, GEO_NODE_POINTS_TO_VERTICES, "Points to Vertices", NODE_CLASS_GEOMETRY, 0);
				ntype.declare = blender::nodes::geo_node_points_to_vertices_declare;
				ntype.geometry_node_execute = blender::nodes::geo_node_points_to_vertices_exec;
				nodeRegisterType(&ntype);
				}