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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::Bool>("Selection").default_value(true).supports_field().hide_value();
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_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_VERTICES;
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);
}
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