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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 "BKE_pointcloud.h"
#include "DNA_pointcloud_types.h"
#include "node_geometry_util.hh"
namespace blender::nodes {
static void geo_node_instances_to_points_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>();
const AttributeDomain attribute_domain = ATTR_DOMAIN_POINT;
GeometryComponentFieldContext field_context{instances, attribute_domain};
const int domain_size = instances.attribute_domain_size(attribute_domain);
fn::FieldEvaluator selection_evaluator{field_context, domain_size};
selection_evaluator.add(std::move(selection_field));
selection_evaluator.evaluate();
const IndexMask selection = selection_evaluator.get_evaluated_as_mask(0);
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>();
fn::FieldEvaluator evaluator{field_context, &selection};
evaluator.add(std::move(position_field));
evaluator.add(std::move(radius_field));
evaluator.evaluate();
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});
if (!instances.instance_ids().is_empty()) {
OutputAttribute_Typed<int> id_attribute = points.attribute_try_get_for_output<int>(
"id", ATTR_DOMAIN_POINT, CD_PROP_INT32);
MutableSpan<int> ids = id_attribute.as_span();
for (const int i : selection.index_range()) {
ids[i] = instances.instance_ids()[selection[i]];
}
id_attribute.save();
}
}
static void geo_node_instances_to_points_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_output("Points", GeometrySet());
}
}
} // namespace blender::nodes
void register_node_type_geo_instances_to_points()
{
static bNodeType ntype;
geo_node_type_base(
&ntype, GEO_NODE_INSTANCES_TO_POINTS, "Instances to Points", NODE_CLASS_GEOMETRY, 0);
ntype.declare = blender::nodes::geo_node_instances_to_points_declare;
ntype.geometry_node_execute = blender::nodes::geo_node_instances_to_points_exec;
nodeRegisterType(&ntype);
}
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