add rest fixer to importer retarget

3 files changed, 498 insertions, 0 deletions

diff --git a/editor/import/post_import_plugin_skeleton_renamer.cpp b/editor/import/post_import_plugin_skeleton_renamer.cpp
index b0c4bc8c30..bf84348ac3 100644
--- a/editor/import/post_import_plugin_skeleton_renamer.cpp
+++ b/editor/import/post_import_plugin_skeleton_renamer.cpp
@@ -39,6 +39,8 @@
 void PostImportPluginSkeletonRenamer::get_internal_import_options(InternalImportCategory p_category, List<ResourceImporter::ImportOption> *r_options) {
 	if (p_category == INTERNAL_IMPORT_CATEGORY_SKELETON_3D_NODE) {
 		r_options->push_back(ResourceImporter::ImportOption(PropertyInfo(Variant::BOOL, "retarget/bone_renamer/rename_bones"), true));
+		r_options->push_back(ResourceImporter::ImportOption(PropertyInfo(Variant::BOOL, "retarget/bone_renamer/unique_node/make_unique"), true));
+		r_options->push_back(ResourceImporter::ImportOption(PropertyInfo(Variant::STRING, "retarget/bone_renamer/unique_node/skeleton_name"), "GeneralSkeleton"));
 	}
 }
 
@@ -137,6 +139,38 @@ void PostImportPluginSkeletonRenamer::internal_process(InternalImportCategory p_
 				nd->callp("_notify_skeleton_bones_renamed", argptrs, argcount, ce);
 			}
 		}
+
+		// Make unique skeleton.
+		if (bool(p_options["retarget/bone_renamer/unique_node/make_unique"])) {
+			String unique_name = String(p_options["retarget/bone_renamer/unique_node/skeleton_name"]);
+			ERR_FAIL_COND_MSG(unique_name == String(), "Skeleton unique name cannot be empty.");
+
+			TypedArray<Node> nodes = p_base_scene->find_children("*", "AnimationPlayer");
+			while (nodes.size()) {
+				AnimationPlayer *ap = Object::cast_to<AnimationPlayer>(nodes.pop_back());
+				List<StringName> anims;
+				ap->get_animation_list(&anims);
+				for (const StringName &name : anims) {
+					Ref<Animation> anim = ap->get_animation(name);
+					int track_len = anim->get_track_count();
+					for (int i = 0; i < track_len; i++) {
+						if (anim->track_get_path(i).get_subname_count() != 1 || !(anim->track_get_type(i) == Animation::TYPE_POSITION_3D || anim->track_get_type(i) == Animation::TYPE_ROTATION_3D || anim->track_get_type(i) == Animation::TYPE_SCALE_3D)) {
+							continue;
+						}
+						String track_path = String(anim->track_get_path(i).get_concatenated_names());
+						Node *node = (ap->get_node(ap->get_root()))->get_node(NodePath(track_path));
+						if (node) {
+							Skeleton3D *track_skeleton = Object::cast_to<Skeleton3D>(node);
+							if (track_skeleton && track_skeleton == skeleton) {
+								anim->track_set_path(i, String("%") + unique_name + String(":") + anim->track_get_path(i).get_concatenated_subnames());
+							}
+						}
+					}
+				}
+			}
+			skeleton->set_name(unique_name);
+			skeleton->set_unique_name_in_owner(true);
+		}
 	}
 }
 
diff --git a/editor/import/post_import_plugin_skeleton_rest_fixer.cpp b/editor/import/post_import_plugin_skeleton_rest_fixer.cpp
new file mode 100644
index 0000000000..8b0d8c8729
--- /dev/null
+++ b/editor/import/post_import_plugin_skeleton_rest_fixer.cpp
@@ -0,0 +1,418 @@
+/*************************************************************************/
+/*  post_import_plugin_skeleton_rest_fixer.cpp                           */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#include "post_import_plugin_skeleton_rest_fixer.h"
+
+#include "editor/import/scene_import_settings.h"
+#include "scene/3d/importer_mesh_instance_3d.h"
+#include "scene/3d/skeleton_3d.h"
+#include "scene/animation/animation_player.h"
+#include "scene/resources/animation.h"
+#include "scene/resources/bone_map.h"
+
+void PostImportPluginSkeletonRestFixer::get_internal_import_options(InternalImportCategory p_category, List<ResourceImporter::ImportOption> *r_options) {
+	if (p_category == INTERNAL_IMPORT_CATEGORY_SKELETON_3D_NODE) {
+		r_options->push_back(ResourceImporter::ImportOption(PropertyInfo(Variant::BOOL, "retarget/rest_fixer/overwrite_axis"), true));
+
+		r_options->push_back(ResourceImporter::ImportOption(PropertyInfo(Variant::BOOL, "retarget/rest_fixer/fix_silhouette/enable"), false));
+		r_options->push_back(ResourceImporter::ImportOption(PropertyInfo(Variant::FLOAT, "retarget/rest_fixer/fix_silhouette/threshold"), 15));
+
+		// TODO: PostImportPlugin need to be implemented such as validate_option(PropertyInfo &property, const Dictionary &p_options).
+		// get_internal_option_visibility() is not sufficient because it can only retrieve options implemented in the core and can only read option values.
+		// r_options->push_back(ResourceImporter::ImportOption(PropertyInfo(Variant::ARRAY, "retarget/rest_fixer/filter", PROPERTY_HINT_ARRAY_TYPE, vformat("%s/%s:%s", Variant::STRING_NAME, PROPERTY_HINT_ENUM, "Hips,Spine,Chest")), Array()));
+		r_options->push_back(ResourceImporter::ImportOption(PropertyInfo(Variant::ARRAY, "retarget/rest_fixer/fix_silhouette/filter", PROPERTY_HINT_ARRAY_TYPE, "StringName"), Array()));
+	}
+}
+
+void PostImportPluginSkeletonRestFixer::internal_process(InternalImportCategory p_category, Node *p_base_scene, Node *p_node, Ref<Resource> p_resource, const Dictionary &p_options) {
+	if (p_category == INTERNAL_IMPORT_CATEGORY_SKELETON_3D_NODE) {
+		// Prepare objects.
+		Object *map = p_options["retarget/bone_map"].get_validated_object();
+		if (!map) {
+			return;
+		}
+		BoneMap *bone_map = Object::cast_to<BoneMap>(map);
+		Ref<SkeletonProfile> profile = bone_map->get_profile();
+		if (!profile.is_valid()) {
+			return;
+		}
+		Skeleton3D *src_skeleton = Object::cast_to<Skeleton3D>(p_node);
+		if (!src_skeleton) {
+			return;
+		}
+		bool is_renamed = bool(p_options["retarget/bone_renamer/rename_bones"]);
+		Array filter = p_options["retarget/rest_fixer/fix_silhouette/filter"];
+		bool is_rest_changed = false;
+
+		// Build profile skeleton.
+		Skeleton3D *prof_skeleton = memnew(Skeleton3D);
+		{
+			int prof_bone_len = profile->get_bone_size();
+			// Add single bones.
+			for (int i = 0; i < prof_bone_len; i++) {
+				prof_skeleton->add_bone(profile->get_bone_name(i));
+				prof_skeleton->set_bone_rest(i, profile->get_reference_pose(i));
+			}
+			// Set parents.
+			for (int i = 0; i < prof_bone_len; i++) {
+				int parent = profile->find_bone(profile->get_bone_parent(i));
+				if (parent >= 0) {
+					prof_skeleton->set_bone_parent(i, parent);
+				}
+			}
+		}
+
+		// Complement Rotation track for compatibility between defference rests.
+		{
+			TypedArray<Node> nodes = p_base_scene->find_children("*", "AnimationPlayer");
+			while (nodes.size()) {
+				AnimationPlayer *ap = Object::cast_to<AnimationPlayer>(nodes.pop_back());
+				List<StringName> anims;
+				ap->get_animation_list(&anims);
+				for (const StringName &name : anims) {
+					Ref<Animation> anim = ap->get_animation(name);
+					int track_len = anim->get_track_count();
+
+					// Detect does the animetion have skeleton's TRS track.
+					String track_path;
+					bool found_skeleton = false;
+					for (int i = 0; i < track_len; i++) {
+						if (anim->track_get_path(i).get_subname_count() != 1 || !(anim->track_get_type(i) == Animation::TYPE_POSITION_3D || anim->track_get_type(i) == Animation::TYPE_ROTATION_3D || anim->track_get_type(i) == Animation::TYPE_SCALE_3D)) {
+							continue;
+						}
+						track_path = String(anim->track_get_path(i).get_concatenated_names());
+						Node *node = (ap->get_node(ap->get_root()))->get_node(NodePath(track_path));
+						if (node) {
+							Skeleton3D *track_skeleton = Object::cast_to<Skeleton3D>(node);
+							if (track_skeleton && track_skeleton == src_skeleton) {
+								found_skeleton = true;
+								break;
+							}
+						}
+					}
+
+					if (found_skeleton) {
+						// Search and insert rot track if it doesn't exist.
+						for (int prof_idx = 0; prof_idx < prof_skeleton->get_bone_count(); prof_idx++) {
+							String bone_name = is_renamed ? prof_skeleton->get_bone_name(prof_idx) : String(bone_map->get_skeleton_bone_name(prof_skeleton->get_bone_name(prof_idx)));
+							if (bone_name == String()) {
+								continue;
+							}
+							int src_idx = src_skeleton->find_bone(bone_name);
+							if (src_idx == -1) {
+								continue;
+							}
+							String insert_path = track_path + ":" + bone_name;
+							int rot_track = anim->find_track(insert_path, Animation::TYPE_ROTATION_3D);
+							if (rot_track == -1) {
+								int track = anim->add_track(Animation::TYPE_ROTATION_3D);
+								anim->track_set_path(track, insert_path);
+								anim->rotation_track_insert_key(track, 0, src_skeleton->get_bone_rest(src_idx).basis.get_rotation_quaternion());
+							}
+						}
+					}
+				}
+			}
+		}
+
+		// Fix silhouette.
+		Vector<Transform3D> silhouette_diff; // Transform values to be ignored when overwrite axis.
+		silhouette_diff.resize(src_skeleton->get_bone_count());
+		Transform3D *silhouette_diff_w = silhouette_diff.ptrw();
+		if (bool(p_options["retarget/rest_fixer/fix_silhouette/enable"])) {
+			LocalVector<Transform3D> old_skeleton_global_rest;
+			for (int i = 0; i < src_skeleton->get_bone_count(); i++) {
+				old_skeleton_global_rest.push_back(src_skeleton->get_bone_global_rest(i));
+			}
+
+			Vector<int> bones_to_process = prof_skeleton->get_parentless_bones();
+			while (bones_to_process.size() > 0) {
+				int prof_idx = bones_to_process[0];
+				bones_to_process.erase(prof_idx);
+				Vector<int> prof_children = prof_skeleton->get_bone_children(prof_idx);
+				for (int i = 0; i < prof_children.size(); i++) {
+					bones_to_process.push_back(prof_children[i]);
+				}
+
+				// Calc virtual/looking direction with origins.
+				bool is_filtered = false;
+				for (int i = 0; i < filter.size(); i++) {
+					if (String(filter[i]) == prof_skeleton->get_bone_name(prof_idx)) {
+						is_filtered = true;
+						break;
+					}
+				}
+				if (is_filtered) {
+					continue;
+				}
+
+				int src_idx = src_skeleton->find_bone(is_renamed ? prof_skeleton->get_bone_name(prof_idx) : String(bone_map->get_skeleton_bone_name(prof_skeleton->get_bone_name(prof_idx))));
+				if (src_idx < 0 || profile->get_tail_direction(prof_idx) == SkeletonProfile::TAIL_DIRECTION_END) {
+					continue;
+				}
+				Vector3 prof_tail;
+				Vector3 src_tail;
+				if (profile->get_tail_direction(prof_idx) == SkeletonProfile::TAIL_DIRECTION_AVERAGE_CHILDREN) {
+					PackedInt32Array prof_bone_children = prof_skeleton->get_bone_children(prof_idx);
+					int children_size = prof_bone_children.size();
+					if (children_size == 0) {
+						continue;
+					}
+					bool exist_all_children = true;
+					for (int i = 0; i < children_size; i++) {
+						int prof_child_idx = prof_bone_children[i];
+						int src_child_idx = src_skeleton->find_bone(is_renamed ? prof_skeleton->get_bone_name(prof_child_idx) : String(bone_map->get_skeleton_bone_name(prof_skeleton->get_bone_name(prof_child_idx))));
+						if (src_child_idx < 0) {
+							exist_all_children = false;
+							break;
+						}
+						prof_tail = prof_tail + prof_skeleton->get_bone_global_rest(prof_child_idx).origin;
+						src_tail = src_tail + src_skeleton->get_bone_global_rest(src_child_idx).origin;
+					}
+					if (!exist_all_children) {
+						continue;
+					}
+					prof_tail = prof_tail / children_size;
+					src_tail = src_tail / children_size;
+				}
+				if (profile->get_tail_direction(prof_idx) == SkeletonProfile::TAIL_DIRECTION_SPECIFIC_CHILD) {
+					int prof_tail_idx = prof_skeleton->find_bone(profile->get_bone_tail(prof_idx));
+					if (prof_tail_idx < 0) {
+						continue;
+					}
+					int src_tail_idx = src_skeleton->find_bone(is_renamed ? prof_skeleton->get_bone_name(prof_tail_idx) : String(bone_map->get_skeleton_bone_name(prof_skeleton->get_bone_name(prof_tail_idx))));
+					if (src_tail_idx < 0) {
+						continue;
+					}
+					prof_tail = prof_skeleton->get_bone_global_rest(prof_tail_idx).origin;
+					src_tail = src_skeleton->get_bone_global_rest(src_tail_idx).origin;
+				}
+
+				Vector3 prof_head = prof_skeleton->get_bone_global_rest(prof_idx).origin;
+				Vector3 src_head = src_skeleton->get_bone_global_rest(src_idx).origin;
+
+				Vector3 prof_dir = prof_tail - prof_head;
+				Vector3 src_dir = src_tail - src_head;
+
+				// Rotate rest.
+				if (Math::abs(Math::rad2deg(src_dir.angle_to(prof_dir))) > float(p_options["retarget/rest_fixer/fix_silhouette/threshold"])) {
+					// Get rotation difference.
+					Vector3 up_vec; // Need to rotate other than roll axis.
+					switch (Vector3(abs(src_dir.x), abs(src_dir.y), abs(src_dir.z)).min_axis_index()) {
+						case Vector3::AXIS_X: {
+							up_vec = Vector3(1, 0, 0);
+						} break;
+						case Vector3::AXIS_Y: {
+							up_vec = Vector3(0, 1, 0);
+						} break;
+						case Vector3::AXIS_Z: {
+							up_vec = Vector3(0, 0, 1);
+						} break;
+					}
+					Basis src_b;
+					src_b = src_b.looking_at(src_dir, up_vec);
+					Basis prof_b;
+					prof_b = src_b.looking_at(prof_dir, up_vec);
+					if (prof_b.is_equal_approx(Basis())) {
+						continue; // May not need to rotate.
+					}
+					Basis diff_b = prof_b * src_b.inverse();
+
+					// Apply rotation difference as global transform to skeleton.
+					Basis src_pg;
+					int src_parent = src_skeleton->get_bone_parent(src_idx);
+					if (src_parent >= 0) {
+						src_pg = src_skeleton->get_bone_global_rest(src_parent).basis;
+					}
+					Transform3D fixed_rest = Transform3D(src_pg.inverse() * diff_b * src_pg * src_skeleton->get_bone_rest(src_idx).basis, src_skeleton->get_bone_rest(src_idx).origin);
+					src_skeleton->set_bone_rest(src_idx, fixed_rest);
+				}
+			}
+
+			// For skin modification in overwrite rest.
+			for (int i = 0; i < src_skeleton->get_bone_count(); i++) {
+				silhouette_diff_w[i] = old_skeleton_global_rest[i] * src_skeleton->get_bone_global_rest(i).inverse();
+			}
+
+			is_rest_changed = true;
+		}
+
+		// Overwrite axis.
+		if (bool(p_options["retarget/rest_fixer/overwrite_axis"])) {
+			LocalVector<Transform3D> old_skeleton_rest;
+			LocalVector<Transform3D> old_skeleton_global_rest;
+			for (int i = 0; i < src_skeleton->get_bone_count(); i++) {
+				old_skeleton_rest.push_back(src_skeleton->get_bone_rest(i));
+				old_skeleton_global_rest.push_back(src_skeleton->get_bone_global_rest(i));
+			}
+
+			Vector<Basis> diffs;
+			diffs.resize(src_skeleton->get_bone_count());
+			Basis *diffs_w = diffs.ptrw();
+
+			Vector<int> bones_to_process = src_skeleton->get_parentless_bones();
+			while (bones_to_process.size() > 0) {
+				int src_idx = bones_to_process[0];
+				bones_to_process.erase(src_idx);
+				Vector<int> src_children = src_skeleton->get_bone_children(src_idx);
+				for (int i = 0; i < src_children.size(); i++) {
+					bones_to_process.push_back(src_children[i]);
+				}
+
+				Basis tgt_rot;
+				StringName src_bone_name = is_renamed ? StringName(src_skeleton->get_bone_name(src_idx)) : bone_map->find_profile_bone_name(src_skeleton->get_bone_name(src_idx));
+				if (src_bone_name != StringName()) {
+					Basis src_pg;
+					int src_parent_idx = src_skeleton->get_bone_parent(src_idx);
+					if (src_parent_idx >= 0) {
+						src_pg = src_skeleton->get_bone_global_rest(src_parent_idx).basis;
+					}
+
+					int prof_idx = profile->find_bone(src_bone_name);
+					if (prof_idx >= 0) {
+						tgt_rot = src_pg.inverse() * prof_skeleton->get_bone_global_rest(prof_idx).basis; // Mapped bone uses reference pose.
+					}
+					/*
+					// If there is rest-relative animation, this logic may be work fine, but currently not so...
+					} else {
+						// tgt_rot = src_pg.inverse() * old_skeleton_global_rest[src_idx].basis; // Non-Mapped bone keeps global rest.
+					}
+					*/
+				}
+
+				if (src_skeleton->get_bone_parent(src_idx) >= 0) {
+					diffs_w[src_idx] = tgt_rot.inverse() * diffs[src_skeleton->get_bone_parent(src_idx)] * src_skeleton->get_bone_rest(src_idx).basis;
+				} else {
+					diffs_w[src_idx] = tgt_rot.inverse() * src_skeleton->get_bone_rest(src_idx).basis;
+				}
+
+				Basis diff;
+				if (src_skeleton->get_bone_parent(src_idx) >= 0) {
+					diff = diffs[src_skeleton->get_bone_parent(src_idx)];
+				}
+				src_skeleton->set_bone_rest(src_idx, Transform3D(tgt_rot, diff.xform(src_skeleton->get_bone_rest(src_idx).origin)));
+			}
+
+			// Fix skin.
+			{
+				TypedArray<Node> nodes = p_base_scene->find_children("*", "ImporterMeshInstance3D");
+				while (nodes.size()) {
+					ImporterMeshInstance3D *mi = Object::cast_to<ImporterMeshInstance3D>(nodes.pop_back());
+					Ref<Skin> skin = mi->get_skin();
+					if (skin.is_valid()) {
+						Node *node = mi->get_node(mi->get_skeleton_path());
+						if (node) {
+							Skeleton3D *mesh_skeleton = Object::cast_to<Skeleton3D>(node);
+							if (mesh_skeleton && node == src_skeleton) {
+								int skin_len = skin->get_bind_count();
+								for (int i = 0; i < skin_len; i++) {
+									StringName bn = skin->get_bind_name(i);
+									int bone_idx = src_skeleton->find_bone(bn);
+									if (bone_idx >= 0) {
+										Transform3D new_rest = silhouette_diff[i] * src_skeleton->get_bone_global_rest(bone_idx);
+										skin->set_bind_pose(i, new_rest.inverse());
+									}
+								}
+							}
+						}
+					}
+				}
+			}
+
+			// Fix animation.
+			{
+				TypedArray<Node> nodes = p_base_scene->find_children("*", "AnimationPlayer");
+				while (nodes.size()) {
+					AnimationPlayer *ap = Object::cast_to<AnimationPlayer>(nodes.pop_back());
+					List<StringName> anims;
+					ap->get_animation_list(&anims);
+					for (const StringName &name : anims) {
+						Ref<Animation> anim = ap->get_animation(name);
+						int track_len = anim->get_track_count();
+						for (int i = 0; i < track_len; i++) {
+							if (anim->track_get_path(i).get_subname_count() != 1 || anim->track_get_type(i) != Animation::TYPE_ROTATION_3D) {
+								continue;
+							}
+
+							if (anim->track_is_compressed(i)) {
+								continue; // TODO: Adopt to compressed track.
+							}
+
+							String track_path = String(anim->track_get_path(i).get_concatenated_names());
+							Node *node = (ap->get_node(ap->get_root()))->get_node(NodePath(track_path));
+							if (node) {
+								Skeleton3D *track_skeleton = Object::cast_to<Skeleton3D>(node);
+								if (track_skeleton && track_skeleton == src_skeleton) {
+									StringName bn = anim->track_get_path(i).get_subname(0);
+									if (bn) {
+										int bone_idx = src_skeleton->find_bone(bn);
+
+										Quaternion old_rest = old_skeleton_rest[bone_idx].basis.get_rotation_quaternion();
+										Quaternion new_rest = src_skeleton->get_bone_rest(bone_idx).basis.get_rotation_quaternion();
+										Quaternion old_pg;
+										Quaternion new_pg;
+										int parent_idx = src_skeleton->get_bone_parent(bone_idx);
+										if (parent_idx >= 0) {
+											old_pg = old_skeleton_global_rest[parent_idx].basis.get_rotation_quaternion();
+											new_pg = src_skeleton->get_bone_global_rest(parent_idx).basis.get_rotation_quaternion();
+										}
+
+										int key_len = anim->track_get_key_count(i);
+										for (int j = 0; j < key_len; j++) {
+											Quaternion qt = static_cast<Quaternion>(anim->track_get_key_value(i, j));
+											anim->track_set_key_value(i, j, new_pg.inverse() * old_pg * qt * old_rest.inverse() * old_pg.inverse() * new_pg * new_rest);
+										}
+									}
+								}
+							}
+						}
+					}
+				}
+			}
+
+			is_rest_changed = true;
+		}
+
+		// Init skeleton pose to new rest.
+		if (is_rest_changed) {
+			for (int i = 0; i < src_skeleton->get_bone_count(); i++) {
+				Transform3D fixed_rest = src_skeleton->get_bone_rest(i);
+				src_skeleton->set_bone_pose_position(i, fixed_rest.origin);
+				src_skeleton->set_bone_pose_rotation(i, fixed_rest.basis.get_rotation_quaternion());
+				src_skeleton->set_bone_pose_scale(i, fixed_rest.basis.get_scale());
+			}
+		}
+
+		memdelete(prof_skeleton);
+	}
+}
+
+PostImportPluginSkeletonRestFixer::PostImportPluginSkeletonRestFixer() {
+}
diff --git a/editor/import/post_import_plugin_skeleton_rest_fixer.h b/editor/import/post_import_plugin_skeleton_rest_fixer.h
new file mode 100644
index 0000000000..11e9d08e88
--- /dev/null
+++ b/editor/import/post_import_plugin_skeleton_rest_fixer.h
@@ -0,0 +1,46 @@
+/*************************************************************************/
+/*  post_import_plugin_skeleton_rest_fixer.h                             */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#ifndef POST_IMPORT_PLUGIN_SKELETON_REST_FIXER_H
+#define POST_IMPORT_PLUGIN_SKELETON_REST_FIXER_H
+
+#include "resource_importer_scene.h"
+
+class PostImportPluginSkeletonRestFixer : public EditorScenePostImportPlugin {
+	GDCLASS(PostImportPluginSkeletonRestFixer, EditorScenePostImportPlugin);
+
+public:
+	virtual void get_internal_import_options(InternalImportCategory p_category, List<ResourceImporter::ImportOption> *r_options) override;
+	virtual void internal_process(InternalImportCategory p_category, Node *p_base_scene, Node *p_node, Ref<Resource> p_resource, const Dictionary &p_options) override;
+
+	PostImportPluginSkeletonRestFixer();
+};
+
+#endif // POST_IMPORT_PLUGIN_SKELETON_REST_FIXER_H