text: /*************************************************************************/
  /*  collision_shape.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).   */
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  /* The above copyright notice and this permission notice shall be        */
  /* included in all copies or substantial portions of the Software.       */
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  /*************************************************************************/
  
  #include "collision_shape.h"
  
  #include "core/math/quick_hull.h"
  #include "mesh_instance.h"
  #include "physics_body.h"
  #include "scene/resources/box_shape.h"
  #include "scene/resources/capsule_shape.h"
  #include "scene/resources/concave_polygon_shape.h"
  #include "scene/resources/convex_polygon_shape.h"
  #include "scene/resources/mesh.h"
  #include "scene/resources/plane_shape.h"
  #include "scene/resources/ray_shape.h"
  #include "scene/resources/shape.h"
  #include "scene/resources/sphere_shape.h"
  #include "servers/visual_server.h"
  
  void CollisionShape::make_convex_from_brothers() {
  	Node *p = get_parent();
  	if (!p) {
  		return;
  	}
  
  	for (int i = 0; i < p->get_child_count(); i++) {
  		Node *n = p->get_child(i);
  		MeshInstance *mi = Object::cast_to<MeshInstance>(n);
  		if (mi) {
  			Ref<Mesh> m = mi->get_mesh();
  			if (m.is_valid()) {
  				Ref<Shape> s = m->create_convex_shape();
  				set_shape(s);
  			}
  		}
  	}
  }
  
  void CollisionShape::_update_in_shape_owner(bool p_xform_only) {
  	parent->shape_owner_set_transform(owner_id, get_transform());
  	if (p_xform_only) {
  		return;
  	}
  	parent->shape_owner_set_disabled(owner_id, disabled);
  }
  
  void CollisionShape::_notification(int p_what) {
  	switch (p_what) {
  		case NOTIFICATION_PARENTED: {
  			parent = Object::cast_to<CollisionObject>(get_parent());
  			if (parent) {
  				owner_id = parent->create_shape_owner(this);
  				if (shape.is_valid()) {
  					parent->shape_owner_add_shape(owner_id, shape);
  				}
  				_update_in_shape_owner();
  			}
  		} break;
  		case NOTIFICATION_ENTER_TREE: {
  			if (parent) {
  				_update_in_shape_owner();
  			}
  		} break;
  		case NOTIFICATION_LOCAL_TRANSFORM_CHANGED: {
  			if (parent) {
  				_update_in_shape_owner(true);
  			}
  		} break;
  		case NOTIFICATION_UNPARENTED: {
  			if (parent) {
  				parent->remove_shape_owner(owner_id);
  			}
  			owner_id = 0;
  			parent = nullptr;
  		} break;
  	}
  }
  
  void CollisionShape::resource_changed(RES res) {
  	update_gizmo();
  }
  
  String CollisionShape::get_configuration_warning() const {
  	String warning = Spatial::get_configuration_warning();
  
  	if (!Object::cast_to<CollisionObject>(get_parent())) {
  		if (warning != String()) {
  			warning += "\n\n";
  		}
  		warning += TTR("CollisionShape only serves to provide a collision shape to a CollisionObject derived node. Please only use it as a child of Area, StaticBody, RigidBody, KinematicBody, etc. to give them a shape.");
  	}
  
  	if (!shape.is_valid()) {
  		if (warning != String()) {
  			warning += "\n\n";
  		}
  		warning += TTR("A shape must be provided for CollisionShape to function. Please create a shape resource for it.");
  	} else {
  		if (shape->is_class("PlaneShape")) {
  			if (warning != String()) {
  				warning += "\n\n";
  			}
  			warning += TTR("Plane shapes don't work well and will be removed in future versions. Please don't use them.");
  		}
  
  		if (Object::cast_to<RigidBody>(get_parent()) &&
  				Object::cast_to<ConcavePolygonShape>(*shape) &&
  				Object::cast_to<RigidBody>(get_parent())->get_mode() != RigidBody::MODE_STATIC) {
  			if (warning != String()) {
  				warning += "\n\n";
  			}
  			warning += TTR("ConcavePolygonShape doesn't support RigidBody in another mode than static.");
  		}
  	}
  
  	return warning;
  }
  
  void CollisionShape::_bind_methods() {
  	//not sure if this should do anything
  	ClassDB::bind_method(D_METHOD("resource_changed", "resource"), &CollisionShape::resource_changed);
  	ClassDB::bind_method(D_METHOD("set_shape", "shape"), &CollisionShape::set_shape);
  	ClassDB::bind_method(D_METHOD("get_shape"), &CollisionShape::get_shape);
  	ClassDB::bind_method(D_METHOD("set_disabled", "enable"), &CollisionShape::set_disabled);
  	ClassDB::bind_method(D_METHOD("is_disabled"), &CollisionShape::is_disabled);
  	ClassDB::bind_method(D_METHOD("make_convex_from_brothers"), &CollisionShape::make_convex_from_brothers);
  	ClassDB::set_method_flags("CollisionShape", "make_convex_from_brothers", METHOD_FLAGS_DEFAULT | METHOD_FLAG_EDITOR);
  
  	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "shape", PROPERTY_HINT_RESOURCE_TYPE, "Shape"), "set_shape", "get_shape");
  	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "disabled"), "set_disabled", "is_disabled");
  }
  
  void CollisionShape::set_shape(const Ref<Shape> &p_shape) {
  	if (p_shape == shape) {
  		return;
  	}
  	if (!shape.is_null()) {
  		shape->unregister_owner(this);
  	}
  	shape = p_shape;
  	if (!shape.is_null()) {
  		shape->register_owner(this);
  	}
  	update_gizmo();
  	if (parent) {
  		parent->shape_owner_clear_shapes(owner_id);
  		if (shape.is_valid()) {
  			parent->shape_owner_add_shape(owner_id, shape);
  		}
  	}
  
  	if (is_inside_tree() && parent) {
  		// If this is a heightfield shape our center may have changed
  		_update_in_shape_owner(true);
  	}
  	update_configuration_warning();
  }
  
  Ref<Shape> CollisionShape::get_shape() const {
  	return shape;
  }
  
  void CollisionShape::set_disabled(bool p_disabled) {
  	disabled = p_disabled;
  	update_gizmo();
  	if (parent) {
  		parent->shape_owner_set_disabled(owner_id, p_disabled);
  	}
  }
  
  bool CollisionShape::is_disabled() const {
  	return disabled;
  }
  
  CollisionShape::CollisionShape() {
  	//indicator = RID_PRIME(VisualServer::get_singleton()->mesh_create());
  	disabled = false;
  	parent = nullptr;
  	owner_id = 0;
  	set_notify_local_transform(true);
  }
  
  CollisionShape::~CollisionShape() {
  	if (!shape.is_null()) {
  		shape->unregister_owner(this);
  	}
  	//VisualServer::get_singleton()->free(indicator);
  }
  