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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_geometry_set_instances.hh"
#include "BKE_mesh_wrapper.h"
#include "BKE_modifier.h"
#include "DNA_collection_types.h"
#include "DNA_object_types.h"
namespace blender::bke {
static void geometry_set_collect_recursive(const GeometrySet &geometry_set,
const float4x4 &transform,
Vector<GeometryInstanceGroup> &r_sets);
static void geometry_set_collect_recursive_collection(const Collection &collection,
const float4x4 &transform,
Vector<GeometryInstanceGroup> &r_sets);
/**
* \note This doesn't extract instances from the "dupli" system for non-geometry-nodes instances.
*/
static GeometrySet object_get_geometry_set_for_read(const Object &object)
{
/* Objects evaluated with a nodes modifier will have a geometry set already. */
if (object.runtime.geometry_set_eval != nullptr) {
return *object.runtime.geometry_set_eval;
}
/* Otherwise, construct a new geometry set with the component based on the object type. */
GeometrySet new_geometry_set;
if (object.type == OB_MESH) {
Mesh *mesh = BKE_modifier_get_evaluated_mesh_from_evaluated_object(
&const_cast<Object &>(object), false);
if (mesh != nullptr) {
BKE_mesh_wrapper_ensure_mdata(mesh);
MeshComponent &mesh_component = new_geometry_set.get_component_for_write<MeshComponent>();
mesh_component.replace(mesh, GeometryOwnershipType::ReadOnly);
mesh_component.copy_vertex_group_names_from_object(object);
}
}
/* TODO: Cover the case of point-clouds without modifiers-- they may not be covered by the
* #geometry_set_eval case above. */
/* TODO: Add volume support. */
/* Return by value since there is not always an existing geometry set owned elsewhere to use. */
return new_geometry_set;
}
static void geometry_set_collect_recursive_collection_instance(
const Collection &collection, const float4x4 &transform, Vector<GeometryInstanceGroup> &r_sets)
{
float4x4 offset_matrix;
unit_m4(offset_matrix.values);
sub_v3_v3(offset_matrix.values[3], collection.instance_offset);
const float4x4 instance_transform = transform * offset_matrix;
geometry_set_collect_recursive_collection(collection, instance_transform, r_sets);
}
static void geometry_set_collect_recursive_object(const Object &object,
const float4x4 &transform,
Vector<GeometryInstanceGroup> &r_sets)
{
GeometrySet instance_geometry_set = object_get_geometry_set_for_read(object);
geometry_set_collect_recursive(instance_geometry_set, transform, r_sets);
if (object.type == OB_EMPTY) {
const Collection *collection_instance = object.instance_collection;
if (collection_instance != nullptr) {
geometry_set_collect_recursive_collection_instance(*collection_instance, transform, r_sets);
}
}
}
static void geometry_set_collect_recursive_collection(const Collection &collection,
const float4x4 &transform,
Vector<GeometryInstanceGroup> &r_sets)
{
LISTBASE_FOREACH (const CollectionObject *, collection_object, &collection.gobject) {
BLI_assert(collection_object->ob != nullptr);
const Object &object = *collection_object->ob;
const float4x4 object_transform = transform * object.obmat;
geometry_set_collect_recursive_object(object, object_transform, r_sets);
}
LISTBASE_FOREACH (const CollectionChild *, collection_child, &collection.children) {
BLI_assert(collection_child->collection != nullptr);
const Collection &collection = *collection_child->collection;
geometry_set_collect_recursive_collection(collection, transform, r_sets);
}
}
static void geometry_set_collect_recursive(const GeometrySet &geometry_set,
const float4x4 &transform,
Vector<GeometryInstanceGroup> &r_sets)
{
r_sets.append({geometry_set, {transform}});
if (geometry_set.has_instances()) {
const InstancesComponent &instances_component =
*geometry_set.get_component_for_read<InstancesComponent>();
Span<float4x4> transforms = instances_component.transforms();
Span<InstancedData> instances = instances_component.instanced_data();
for (const int i : instances.index_range()) {
const InstancedData &data = instances[i];
const float4x4 instance_transform = transform * transforms[i];
if (data.type == INSTANCE_DATA_TYPE_OBJECT) {
BLI_assert(data.data.object != nullptr);
const Object &object = *data.data.object;
geometry_set_collect_recursive_object(object, instance_transform, r_sets);
}
else if (data.type == INSTANCE_DATA_TYPE_COLLECTION) {
BLI_assert(data.data.collection != nullptr);
const Collection &collection = *data.data.collection;
geometry_set_collect_recursive_collection_instance(collection, instance_transform, r_sets);
}
}
}
}
/**
* Return flattened vector of the geometry component's recursive instances. I.e. all collection
* instances and object instances will be expanded into the instances of their geometry components.
* Even the instances in those geometry components' will be included.
*
* \note For convenience (to avoid duplication in the caller), the returned vector also contains
* the argument geometry set.
*
* \note This doesn't extract instances from the "dupli" system for non-geometry-nodes instances.
*/
Vector<GeometryInstanceGroup> geometry_set_gather_instances(const GeometrySet &geometry_set)
{
Vector<GeometryInstanceGroup> result_vector;
float4x4 unit_transform;
unit_m4(unit_transform.values);
geometry_set_collect_recursive(geometry_set, unit_transform, result_vector);
return result_vector;
}
} // namespace blender::bke
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