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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include "DNA_pointcloud_types.h"
#include "BKE_attribute_math.hh"
#include "BKE_instances.hh"
#include "BKE_pointcloud.h"
#include "node_geometry_util.hh"
namespace blender::nodes::node_geo_instances_to_points_cc {
static void node_declare(NodeDeclarationBuilder &b)
{
b.add_input<decl::Geometry>(N_("Instances")).only_instances();
b.add_input<decl::Bool>(N_("Selection")).default_value(true).hide_value().supports_field();
b.add_input<decl::Vector>(N_("Position")).implicit_field(implicit_field_inputs::position);
b.add_input<decl::Float>(N_("Radius"))
.default_value(0.05f)
.min(0.0f)
.subtype(PROP_DISTANCE)
.supports_field();
b.add_output<decl::Geometry>(N_("Points"));
}
static void convert_instances_to_points(GeometrySet &geometry_set,
Field<float3> position_field,
Field<float> radius_field,
const Field<bool> selection_field)
{
const bke::Instances &instances = *geometry_set.get_instances_for_read();
const bke::InstancesFieldContext context{instances};
fn::FieldEvaluator evaluator{context, instances.instances_num()};
evaluator.set_selection(std::move(selection_field));
evaluator.add(std::move(position_field));
evaluator.add(std::move(radius_field));
evaluator.evaluate();
const IndexMask selection = evaluator.get_evaluated_selection_as_mask();
if (selection.is_empty()) {
return;
}
const VArray<float3> &positions = evaluator.get_evaluated<float3>(0);
const VArray<float> radii = evaluator.get_evaluated<float>(1);
PointCloud *pointcloud = BKE_pointcloud_new_nomain(selection.size());
geometry_set.replace_pointcloud(pointcloud);
bke::MutableAttributeAccessor point_attributes = pointcloud->attributes_for_write();
bke::SpanAttributeWriter<float3> point_positions =
point_attributes.lookup_or_add_for_write_only_span<float3>("position", ATTR_DOMAIN_POINT);
bke::SpanAttributeWriter<float> point_radii =
point_attributes.lookup_or_add_for_write_only_span<float>("radius", ATTR_DOMAIN_POINT);
positions.materialize_compressed_to_uninitialized(selection, point_positions.span);
radii.materialize_compressed_to_uninitialized(selection, point_radii.span);
point_positions.finish();
point_radii.finish();
Map<AttributeIDRef, AttributeKind> attributes_to_propagate;
geometry_set.gather_attributes_for_propagation({GEO_COMPONENT_TYPE_INSTANCES},
GEO_COMPONENT_TYPE_POINT_CLOUD,
false,
attributes_to_propagate);
/* These two attributes are added by the implicit inputs above. */
attributes_to_propagate.remove("position");
attributes_to_propagate.remove("radius");
for (const auto item : attributes_to_propagate.items()) {
const AttributeIDRef &attribute_id = item.key;
const AttributeKind attribute_kind = item.value;
const GVArray src = instances.attributes().lookup_or_default(
attribute_id, ATTR_DOMAIN_INSTANCE, attribute_kind.data_type);
BLI_assert(src);
GSpanAttributeWriter dst = point_attributes.lookup_or_add_for_write_only_span(
attribute_id, ATTR_DOMAIN_POINT, attribute_kind.data_type);
BLI_assert(dst);
src.materialize_compressed_to_uninitialized(selection, dst.span.data());
dst.finish();
}
}
static void node_geo_exec(GeoNodeExecParams params)
{
GeometrySet geometry_set = params.extract_input<GeometrySet>("Instances");
if (geometry_set.has_instances()) {
convert_instances_to_points(geometry_set,
params.extract_input<Field<float3>>("Position"),
params.extract_input<Field<float>>("Radius"),
params.extract_input<Field<bool>>("Selection"));
geometry_set.keep_only({GEO_COMPONENT_TYPE_POINT_CLOUD, GEO_COMPONENT_TYPE_EDIT});
params.set_output("Points", std::move(geometry_set));
}
else {
params.set_default_remaining_outputs();
}
}
} // namespace blender::nodes::node_geo_instances_to_points_cc
void register_node_type_geo_instances_to_points()
{
namespace file_ns = blender::nodes::node_geo_instances_to_points_cc;
static bNodeType ntype;
geo_node_type_base(
&ntype, GEO_NODE_INSTANCES_TO_POINTS, "Instances to Points", NODE_CLASS_GEOMETRY);
ntype.declare = file_ns::node_declare;
ntype.geometry_node_execute = file_ns::node_geo_exec;
nodeRegisterType(&ntype);
}
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