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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include "node_geometry_util.hh"
#include "UI_interface.h"
#include "UI_resources.h"
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "DNA_pointcloud_types.h"
#include "DNA_volume_types.h"
#include "BKE_material.h"
namespace blender::nodes::node_geo_set_material_cc {
static void node_declare(NodeDeclarationBuilder &b)
{
b.add_input<decl::Geometry>(N_("Geometry"))
.supported_type(
{GEO_COMPONENT_TYPE_MESH, GEO_COMPONENT_TYPE_VOLUME, GEO_COMPONENT_TYPE_POINT_CLOUD});
b.add_input<decl::Bool>(N_("Selection")).default_value(true).hide_value().supports_field();
b.add_input<decl::Material>(N_("Material")).hide_label();
b.add_output<decl::Geometry>(N_("Geometry"));
}
static void assign_material_to_faces(Mesh &mesh, const IndexMask selection, Material *material)
{
if (selection.size() != mesh.totpoly) {
/* If the entire mesh isn't selected, and there is no material slot yet, add an empty
* slot so that the faces that aren't selected can still refer to the default material. */
BKE_id_material_eval_ensure_default_slot(&mesh.id);
}
int new_material_index = -1;
for (const int i : IndexRange(mesh.totcol)) {
Material *other_material = mesh.mat[i];
if (other_material == material) {
new_material_index = i;
break;
}
}
if (new_material_index == -1) {
/* Append a new material index. */
new_material_index = mesh.totcol;
BKE_id_material_eval_assign(&mesh.id, new_material_index + 1, material);
}
mesh.mpoly = (MPoly *)CustomData_duplicate_referenced_layer(&mesh.pdata, CD_MPOLY, mesh.totpoly);
for (const int i : selection) {
MPoly &poly = mesh.mpoly[i];
poly.mat_nr = new_material_index;
}
}
static void node_geo_exec(GeoNodeExecParams params)
{
Material *material = params.extract_input<Material *>("Material");
const Field<bool> selection_field = params.extract_input<Field<bool>>("Selection");
GeometrySet geometry_set = params.extract_input<GeometrySet>("Geometry");
/* Only add the warnings once, even if there are many unique instances. */
bool point_selection_warning = false;
bool volume_selection_warning = false;
geometry_set.modify_geometry_sets([&](GeometrySet &geometry_set) {
if (geometry_set.has_mesh()) {
MeshComponent &mesh_component = geometry_set.get_component_for_write<MeshComponent>();
Mesh &mesh = *mesh_component.get_for_write();
GeometryComponentFieldContext field_context{mesh_component, ATTR_DOMAIN_FACE};
fn::FieldEvaluator selection_evaluator{field_context, mesh.totpoly};
selection_evaluator.add(selection_field);
selection_evaluator.evaluate();
const IndexMask selection = selection_evaluator.get_evaluated_as_mask(0);
assign_material_to_faces(mesh, selection, material);
}
if (Volume *volume = geometry_set.get_volume_for_write()) {
BKE_id_material_eval_assign(&volume->id, 1, material);
if (selection_field.node().depends_on_input()) {
volume_selection_warning = true;
}
}
if (PointCloud *pointcloud = geometry_set.get_pointcloud_for_write()) {
BKE_id_material_eval_assign(&pointcloud->id, 1, material);
if (selection_field.node().depends_on_input()) {
point_selection_warning = true;
}
}
});
if (volume_selection_warning) {
params.error_message_add(
NodeWarningType::Info,
TIP_("Volumes only support a single material; selection input can not be a field"));
}
if (point_selection_warning) {
params.error_message_add(
NodeWarningType::Info,
TIP_("Point clouds only support a single material; selection input can not be a field"));
}
params.set_output("Geometry", std::move(geometry_set));
}
} // namespace blender::nodes::node_geo_set_material_cc
void register_node_type_geo_set_material()
{
namespace file_ns = blender::nodes::node_geo_set_material_cc;
static bNodeType ntype;
geo_node_type_base(&ntype, GEO_NODE_SET_MATERIAL, "Set Material", NODE_CLASS_GEOMETRY);
ntype.declare = file_ns::node_declare;
ntype.geometry_node_execute = file_ns::node_geo_exec;
nodeRegisterType(&ntype);
}
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