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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include "BLI_math_matrix.h"
#include "DNA_collection_types.h"
#include "UI_interface.h"
#include "UI_resources.h"
#include "BKE_collection.h"
#include "BKE_instances.hh"
#include "node_geometry_util.hh"
#include <algorithm>
namespace blender::nodes::node_geo_collection_info_cc {
NODE_STORAGE_FUNCS(NodeGeometryCollectionInfo)
static void node_declare(NodeDeclarationBuilder &b)
{
b.add_input<decl::Collection>(N_("Collection")).hide_label();
b.add_input<decl::Bool>(N_("Separate Children"))
.description(
N_("Output each child of the collection as a separate instance, sorted alphabetically"));
b.add_input<decl::Bool>(N_("Reset Children"))
.description(
N_("Reset the transforms of every child instance in the output. Only used when Separate "
"Children is enabled"));
b.add_output<decl::Geometry>(N_("Geometry"));
}
static void node_layout(uiLayout *layout, bContext * /*C*/, PointerRNA *ptr)
{
uiItemR(layout, ptr, "transform_space", UI_ITEM_R_EXPAND, nullptr, ICON_NONE);
}
static void node_node_init(bNodeTree * /*tree*/, bNode *node)
{
NodeGeometryCollectionInfo *data = MEM_cnew<NodeGeometryCollectionInfo>(__func__);
data->transform_space = GEO_NODE_TRANSFORM_SPACE_ORIGINAL;
node->storage = data;
}
struct InstanceListEntry {
int handle;
char *name;
float4x4 transform;
};
static void node_geo_exec(GeoNodeExecParams params)
{
Collection *collection = params.get_input<Collection *>("Collection");
if (collection == nullptr) {
params.set_default_remaining_outputs();
return;
}
const Object *self_object = params.self_object();
const bool is_recursive = BKE_collection_has_object_recursive_instanced(
collection, const_cast<Object *>(self_object));
if (is_recursive) {
params.error_message_add(NodeWarningType::Error, "Collection contains current object");
params.set_default_remaining_outputs();
return;
}
const NodeGeometryCollectionInfo &storage = node_storage(params.node());
const bool use_relative_transform = (storage.transform_space ==
GEO_NODE_TRANSFORM_SPACE_RELATIVE);
std::unique_ptr<bke::Instances> instances = std::make_unique<bke::Instances>();
const bool separate_children = params.get_input<bool>("Separate Children");
if (separate_children) {
const bool reset_children = params.get_input<bool>("Reset Children");
Vector<Collection *> children_collections;
LISTBASE_FOREACH (CollectionChild *, collection_child, &collection->children) {
children_collections.append(collection_child->collection);
}
Vector<Object *> children_objects;
LISTBASE_FOREACH (CollectionObject *, collection_object, &collection->gobject) {
children_objects.append(collection_object->ob);
}
instances->reserve(children_collections.size() + children_objects.size());
Vector<InstanceListEntry> entries;
entries.reserve(children_collections.size() + children_objects.size());
for (Collection *child_collection : children_collections) {
float4x4 transform = float4x4::identity();
if (!reset_children) {
add_v3_v3(transform.values[3], child_collection->instance_offset);
if (use_relative_transform) {
mul_m4_m4_pre(transform.values, self_object->world_to_object);
}
else {
sub_v3_v3(transform.values[3], collection->instance_offset);
}
}
const int handle = instances->add_reference(*child_collection);
entries.append({handle, &(child_collection->id.name[2]), transform});
}
for (Object *child_object : children_objects) {
const int handle = instances->add_reference(*child_object);
float4x4 transform = float4x4::identity();
if (!reset_children) {
if (use_relative_transform) {
transform = self_object->world_to_object;
}
else {
sub_v3_v3(transform.values[3], collection->instance_offset);
}
mul_m4_m4_post(transform.values, child_object->object_to_world);
}
entries.append({handle, &(child_object->id.name[2]), transform});
}
std::sort(entries.begin(),
entries.end(),
[](const InstanceListEntry &a, const InstanceListEntry &b) {
return BLI_strcasecmp_natural(a.name, b.name) < 0;
});
for (const InstanceListEntry &entry : entries) {
instances->add_instance(entry.handle, entry.transform);
}
}
else {
float4x4 transform = float4x4::identity();
if (use_relative_transform) {
copy_v3_v3(transform.values[3], collection->instance_offset);
mul_m4_m4_pre(transform.values, self_object->world_to_object);
}
const int handle = instances->add_reference(*collection);
instances->add_instance(handle, transform);
}
params.set_output("Geometry", GeometrySet::create_with_instances(instances.release()));
}
} // namespace blender::nodes::node_geo_collection_info_cc
void register_node_type_geo_collection_info()
{
namespace file_ns = blender::nodes::node_geo_collection_info_cc;
static bNodeType ntype;
geo_node_type_base(&ntype, GEO_NODE_COLLECTION_INFO, "Collection Info", NODE_CLASS_INPUT);
ntype.declare = file_ns::node_declare;
ntype.initfunc = file_ns::node_node_init;
node_type_storage(&ntype,
"NodeGeometryCollectionInfo",
node_free_standard_storage,
node_copy_standard_storage);
ntype.geometry_node_execute = file_ns::node_geo_exec;
ntype.draw_buttons = file_ns::node_layout;
nodeRegisterType(&ntype);
}
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