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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include "BLI_array_utils.hh"
#include "BLI_task.hh"
#include "DNA_mesh_types.h"
#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::node_geo_mesh_to_points_cc {
NODE_STORAGE_FUNCS(NodeGeometryMeshToPoints)
static void node_declare(NodeDeclarationBuilder &b)
{
b.add_input<decl::Geometry>(N_("Mesh")).supported_type(GEO_COMPONENT_TYPE_MESH);
b.add_input<decl::Bool>(N_("Selection")).default_value(true).supports_field().hide_value();
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 node_layout(uiLayout *layout, bContext * /*C*/, PointerRNA *ptr)
{
uiItemR(layout, ptr, "mode", 0, "", ICON_NONE);
}
static void node_init(bNodeTree * /*tree*/, bNode *node)
{
NodeGeometryMeshToPoints *data = MEM_cnew<NodeGeometryMeshToPoints>(__func__);
data->mode = GEO_NODE_MESH_TO_POINTS_VERTICES;
node->storage = data;
}
static void geometry_set_mesh_to_points(GeometrySet &geometry_set,
Field<float3> &position_field,
Field<float> &radius_field,
Field<bool> &selection_field,
const eAttrDomain domain)
{
const Mesh *mesh = geometry_set.get_mesh_for_read();
if (mesh == nullptr) {
geometry_set.remove_geometry_during_modify();
return;
}
const int domain_size = mesh->attributes().domain_size(domain);
if (domain_size == 0) {
geometry_set.remove_geometry_during_modify();
return;
}
bke::MeshFieldContext field_context{*mesh, domain};
fn::FieldEvaluator evaluator{field_context, domain_size};
evaluator.set_selection(selection_field);
/* 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. */
evaluator.add(position_field);
evaluator.add(radius_field);
evaluator.evaluate();
const IndexMask selection = evaluator.get_evaluated_selection_as_mask();
PointCloud *pointcloud = BKE_pointcloud_new_nomain(selection.size());
geometry_set.replace_pointcloud(pointcloud);
MutableAttributeAccessor dst_attributes = pointcloud->attributes_for_write();
GSpanAttributeWriter position = dst_attributes.lookup_or_add_for_write_only_span(
"position", ATTR_DOMAIN_POINT, CD_PROP_FLOAT3);
array_utils::gather(evaluator.get_evaluated(0), selection, position.span);
position.finish();
GSpanAttributeWriter radius = dst_attributes.lookup_or_add_for_write_only_span(
"radius", ATTR_DOMAIN_POINT, CD_PROP_FLOAT);
array_utils::gather(evaluator.get_evaluated(1), selection, radius.span);
radius.finish();
Map<AttributeIDRef, AttributeKind> attributes;
geometry_set.gather_attributes_for_propagation(
{GEO_COMPONENT_TYPE_MESH}, GEO_COMPONENT_TYPE_POINT_CLOUD, false, attributes);
attributes.remove("position");
const AttributeAccessor src_attributes = mesh->attributes();
for (Map<AttributeIDRef, AttributeKind>::Item entry : attributes.items()) {
const AttributeIDRef attribute_id = entry.key;
const eCustomDataType data_type = entry.value.data_type;
GVArray src = src_attributes.lookup_or_default(attribute_id, domain, data_type);
GSpanAttributeWriter dst = dst_attributes.lookup_or_add_for_write_only_span(
attribute_id, ATTR_DOMAIN_POINT, data_type);
if (dst && src) {
array_utils::gather(src, selection, dst.span);
dst.finish();
}
}
geometry_set.keep_only_during_modify({GEO_COMPONENT_TYPE_POINT_CLOUD});
}
static void node_geo_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); },
fn::CustomMF_presets::AllSpanOrSingle());
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 = node_storage(params.node());
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::node_geo_mesh_to_points_cc
void register_node_type_geo_mesh_to_points()
{
namespace file_ns = blender::nodes::node_geo_mesh_to_points_cc;
static bNodeType ntype;
geo_node_type_base(&ntype, GEO_NODE_MESH_TO_POINTS, "Mesh to Points", NODE_CLASS_GEOMETRY);
ntype.declare = file_ns::node_declare;
ntype.geometry_node_execute = file_ns::node_geo_exec;
node_type_init(&ntype, file_ns::node_init);
ntype.draw_buttons = file_ns::node_layout;
node_type_storage(
&ntype, "NodeGeometryMeshToPoints", node_free_standard_storage, node_copy_standard_storage);
nodeRegisterType(&ntype);
}
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