Differential D12689 Diff 42665 source/blender/nodes/geometry/nodes/node_geo_mesh_to_points.cc

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source/blender/nodes/geometry/nodes/node_geo_mesh_to_points.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 "DNA_pointcloud_types.h"

				#include "BKE_attribute_math.hh"
				#include "BKE_pointcloud.h"

				#include "UI_interface.h"
				#include "UI_resources.h"

				#include "node_geometry_util.hh"

				using blender::Array;

				namespace blender::nodes {

				static void geo_node_mesh_to_points_declare(NodeDeclarationBuilder &b)
				{
				b.add_input<decl::Geometry>("Mesh");
				b.add_input<decl::Vector>("Position").implicit_field();
				b.add_input<decl::Float>("Radius")
				.default_value(0.05f)
				.min(0.0f)
				.subtype(PROP_DISTANCE)
				.supports_field();
				b.add_input<decl::Bool>("Selection").default_value(true).supports_field().hide_value();
				b.add_output<decl::Geometry>("Points");
				}

				static void geo_node_mesh_to_points_layout(uiLayout layout, bContext UNUSED(C), PointerRNA *ptr)
				{
				uiItemR(layout, ptr, "mode", 0, "", ICON_NONE);
				}

				static void geo_node_mesh_to_points_init(bNodeTree UNUSED(tree), bNode node)
				{
				NodeGeometryMeshToPoints data = (NodeGeometryMeshToPoints )MEM_callocN(
				sizeof(NodeGeometryMeshToPoints), __func__);
				data->mode = GEO_NODE_MESH_TO_POINTS_FACES;
				node->storage = data;
				}

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

				static void geometry_set_mesh_to_points(GeometrySet &geometry_set,
				Field<float3> &position_field,
				Field<float> &radius_field,
				Field<bool> &selection_field,
				const AttributeDomain domain)
				{
				const MeshComponent *mesh_component = geometry_set.get_component_for_read<MeshComponent>();
				if (mesh_component == nullptr) {
				geometry_set.keep_only({GEO_COMPONENT_TYPE_INSTANCES});
				return;
				}
				GeometryComponentFieldContext field_context{*mesh_component, domain};
				const int domain_size = mesh_component->attribute_domain_size(domain);
				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);

				PointCloud *pointcloud = BKE_pointcloud_new_nomain(selection.size());
				uninitialized_fill_n(pointcloud->radius, pointcloud->totpoint, 0.05f);
				geometry_set.replace_pointcloud(pointcloud);
				PointCloudComponent &point_component =
				geometry_set.get_component_for_write<PointCloudComponent>();

				/* Evaluating directly into the point cloud doesn't work because we are not using the full
				* "min_array_size" array but compressing the selected elements into the final array with no
				* gaps. */
				fn::FieldEvaluator evaluator{field_context, &selection};
				evaluator.add(position_field);
				evaluator.add(radius_field);
				evaluator.evaluate();
				copy_attribute_to_points(evaluator.get_evaluated<float3>(0),
				selection,
				{(float3 *)pointcloud->co, pointcloud->totpoint});
				copy_attribute_to_points(
				evaluator.get_evaluated<float>(1), selection, {pointcloud->radius, pointcloud->totpoint});

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

				for (Map<AttributeIDRef, AttributeKind>::Item entry : attributes.items()) {
				const AttributeIDRef attribute_id = entry.key;
				const CustomDataType data_type = entry.value.data_type;
				GVArrayPtr src = mesh_component->attribute_get_for_read(attribute_id, domain, data_type);
				OutputAttribute dst = point_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};
				copy_attribute_to_points(*src_typed, selection, dst.as_span().typed<T>());
				});
				dst.save();
				}
				}

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

				static void geo_node_mesh_to_points_exec(GeoNodeExecParams params)
				{
				GeometrySet geometry_set = params.extract_input<GeometrySet>("Mesh");
				Field<float3> position = params.extract_input<Field<float3>>("Position");
				Field<float> radius = params.extract_input<Field<float>>("Radius");
				Field<bool> selection = params.extract_input<Field<bool>>("Selection");

				/* Use another multi-function operation to make sure the input radius is greater than zero.
				* TODO: Use mutable multi-function once that is supported. */
				static fn::CustomMF_SI_SO<float, float> max_zero_fn(
				__func__, [](float value) { return std::max(0.0f, value); });
				auto max_zero_op = std::make_shared<FieldOperation>(
				FieldOperation(max_zero_fn, {std::move(radius)}));
				Field<float> positive_radius(std::move(max_zero_op), 0);

				const NodeGeometryMeshToPoints &storage =
				(const NodeGeometryMeshToPoints )params.node().storage;
				const GeometryNodeMeshToPointsMode mode = (GeometryNodeMeshToPointsMode)storage.mode;

				geometry_set.modify_geometry_sets([&](GeometrySet &geometry_set) {
				switch (mode) {
				case GEO_NODE_MESH_TO_POINTS_VERTICES:
				geometry_set_mesh_to_points(
				geometry_set, position, positive_radius, selection, ATTR_DOMAIN_POINT);
				break;
				case GEO_NODE_MESH_TO_POINTS_EDGES:
				geometry_set_mesh_to_points(
				geometry_set, position, positive_radius, selection, ATTR_DOMAIN_EDGE);
				break;
				case GEO_NODE_MESH_TO_POINTS_FACES:
				geometry_set_mesh_to_points(
				geometry_set, position, positive_radius, selection, ATTR_DOMAIN_FACE);
				break;
				case GEO_NODE_MESH_TO_POINTS_CORNERS:
				geometry_set_mesh_to_points(
				geometry_set, position, positive_radius, selection, ATTR_DOMAIN_CORNER);
				break;
				}
				});

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

				} // namespace blender::nodes

				void register_node_type_geo_mesh_to_points()
				{
				static bNodeType ntype;

				geo_node_type_base(&ntype, GEO_NODE_MESH_TO_POINTS, "Mesh to Points", NODE_CLASS_GEOMETRY, 0);
				ntype.declare = blender::nodes::geo_node_mesh_to_points_declare;
				ntype.geometry_node_execute = blender::nodes::geo_node_mesh_to_points_exec;
				node_type_init(&ntype, blender::nodes::geo_node_mesh_to_points_init);
				ntype.draw_buttons = blender::nodes::geo_node_mesh_to_points_layout;
				node_type_storage(
				&ntype, "NodeGeometryMeshToPoints", node_free_standard_storage, node_copy_standard_storage);
				nodeRegisterType(&ntype);
				}