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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 "node_geometry_util.hh"
#include "UI_interface.h"
#include "UI_resources.h"
#include "DNA_mesh_types.h"
#include "DNA_meshdata_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});
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)
{
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");
bool volume_selection_warning = false;
geometry_set.modify_geometry_sets([&](GeometrySet &geometry_set) {
if (geometry_set.has<MeshComponent>()) {
MeshComponent &mesh_component = geometry_set.get_component_for_write<MeshComponent>();
Mesh *mesh = mesh_component.get_for_write();
if (mesh != nullptr) {
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 (geometry_set.has_volume()) {
Volume &volume = *geometry_set.get_volume_for_write();
if (selection_field.node().depends_on_input()) {
volume_selection_warning = true;
}
BKE_id_material_eval_assign(&volume.id, 1, material);
}
});
if (volume_selection_warning) {
/* Only add the warning once, even if there are many unique volume instances. */
params.error_message_add(
NodeWarningType::Info,
TIP_("Volumes 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, 0);
ntype.declare = file_ns::node_declare;
ntype.geometry_node_execute = file_ns::node_geo_exec;
nodeRegisterType(&ntype);
}
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