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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 "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();
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"));
}
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 convert_instances_to_points(GeometrySet &geometry_set,
Field<float3> position_field,
Field<float> radius_field,
const Field<bool> selection_field)
{
const InstancesComponent &instances = *geometry_set.get_component_for_read<InstancesComponent>();
GeometryComponentFieldContext field_context{instances, ATTR_DOMAIN_INSTANCE};
const int domain_size = instances.attribute_domain_size(ATTR_DOMAIN_INSTANCE);
fn::FieldEvaluator evaluator{field_context, domain_size};
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;
}
PointCloud *pointcloud = BKE_pointcloud_new_nomain(selection.size());
geometry_set.replace_pointcloud(pointcloud);
PointCloudComponent &points = geometry_set.get_component_for_write<PointCloudComponent>();
const VArray<float3> &positions = evaluator.get_evaluated<float3>(0);
copy_attribute_to_points(positions, selection, {(float3 *)pointcloud->co, pointcloud->totpoint});
const VArray<float> &radii = evaluator.get_evaluated<float>(1);
copy_attribute_to_points(radii, selection, {pointcloud->radius, pointcloud->totpoint});
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.attribute_get_for_read(
attribute_id, ATTR_DOMAIN_INSTANCE, attribute_kind.data_type);
BLI_assert(src);
OutputAttribute dst = points.attribute_try_get_for_output_only(
attribute_id, ATTR_DOMAIN_POINT, attribute_kind.data_type);
BLI_assert(dst);
attribute_math::convert_to_static_type(attribute_kind.data_type, [&](auto dummy) {
using T = decltype(dummy);
copy_attribute_to_points(src.typed<T>(), selection, dst.as_span().typed<T>());
});
dst.save();
}
}
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});
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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