diff --git a/CHANGELOG.md b/CHANGELOG.md
index 47cfd00310..bd74e4e1d5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -21,6 +21,7 @@
     Bug #4039: Multiple followers should have the same following distance
     Bug #4055: Local scripts don't inherit variables from their base record
     Bug #4083: Door animation freezes when colliding with actors
+    Bug #4201: Projectile-projectile collision
     Bug #4247: Cannot walk up stairs in Ebonheart docks
     Bug #4363: Editor: Defect in Clone Function for Dialogue Info records
     Bug #4447: Actor collision capsule shape allows looking through some walls
diff --git a/apps/openmw/CMakeLists.txt b/apps/openmw/CMakeLists.txt
index f96ddb27f8..c01cbe60c7 100644
--- a/apps/openmw/CMakeLists.txt
+++ b/apps/openmw/CMakeLists.txt
@@ -73,7 +73,7 @@ add_openmw_dir (mwworld
 add_openmw_dir (mwphysics
     physicssystem trace collisiontype actor convert object heightfield closestnotmerayresultcallback
     contacttestresultcallback deepestnotmecontacttestresultcallback stepper movementsolver projectile
-    closestnotmeconvexresultcallback raycasting mtphysics contacttestwrapper
+    actorconvexcallback raycasting mtphysics contacttestwrapper projectileconvexcallback
     )
 
 add_openmw_dir (mwclass
diff --git a/apps/openmw/mwmechanics/spellcasting.cpp b/apps/openmw/mwmechanics/spellcasting.cpp
index 81b3a353df..142914c358 100644
--- a/apps/openmw/mwmechanics/spellcasting.cpp
+++ b/apps/openmw/mwmechanics/spellcasting.cpp
@@ -60,7 +60,10 @@ namespace MWMechanics
     void CastSpell::inflict(const MWWorld::Ptr &target, const MWWorld::Ptr &caster,
                             const ESM::EffectList &effects, ESM::RangeType range, bool reflected, bool exploded)
     {
-        if (!target.isEmpty() && target.getClass().isActor())
+        if (target.isEmpty())
+            return;
+
+        if (target.getClass().isActor())
         {
             // Early-out for characters that have departed.
             const auto& stats = target.getClass().getCreatureStats(target);
@@ -82,7 +85,7 @@ namespace MWMechanics
             return;
 
         const ESM::Spell* spell = MWBase::Environment::get().getWorld()->getStore().get<ESM::Spell>().search (mId);
-        if (spell && !target.isEmpty() && (spell->mData.mType == ESM::Spell::ST_Disease || spell->mData.mType == ESM::Spell::ST_Blight))
+        if (spell && target.getClass().isActor() && (spell->mData.mType == ESM::Spell::ST_Disease || spell->mData.mType == ESM::Spell::ST_Blight))
         {
             int requiredResistance = (spell->mData.mType == ESM::Spell::ST_Disease) ?
                 ESM::MagicEffect::ResistCommonDisease
@@ -105,13 +108,13 @@ namespace MWMechanics
         // This is required for Weakness effects in a spell to apply to any subsequent effects in the spell.
         // Otherwise, they'd only apply after the whole spell was added.
         MagicEffects targetEffects;
-        if (!target.isEmpty() && target.getClass().isActor())
+        if (target.getClass().isActor())
             targetEffects += target.getClass().getCreatureStats(target).getMagicEffects();
 
         bool castByPlayer = (!caster.isEmpty() && caster == getPlayer());
 
         ActiveSpells targetSpells;
-        if (!target.isEmpty() && target.getClass().isActor())
+        if (target.getClass().isActor())
             targetSpells = target.getClass().getCreatureStats(target).getActiveSpells();
 
         bool canCastAnEffect = false;    // For bound equipment.If this remains false
@@ -123,7 +126,7 @@ namespace MWMechanics
 
         int currentEffectIndex = 0;
         for (std::vector<ESM::ENAMstruct>::const_iterator effectIt (effects.mList.begin());
-             !target.isEmpty() && effectIt != effects.mList.end(); ++effectIt, ++currentEffectIndex)
+             effectIt != effects.mList.end(); ++effectIt, ++currentEffectIndex)
         {
             if (effectIt->mRange != range)
                 continue;
@@ -267,7 +270,7 @@ namespace MWMechanics
                 }
 
                 // Re-casting a summon effect will remove the creature from previous castings of that effect.
-                if (isSummoningEffect(effectIt->mEffectID) && !target.isEmpty() && target.getClass().isActor())
+                if (isSummoningEffect(effectIt->mEffectID) && target.getClass().isActor())
                 {
                     CreatureStats& targetStats = target.getClass().getCreatureStats(target);
                     ESM::SummonKey key(effectIt->mEffectID, mId, currentEffectIndex);
@@ -310,18 +313,16 @@ namespace MWMechanics
         if (!exploded)
             MWBase::Environment::get().getWorld()->explodeSpell(mHitPosition, effects, caster, target, range, mId, mSourceName, mFromProjectile);
 
-        if (!target.isEmpty()) {
-            if (!reflectedEffects.mList.empty())
-                inflict(caster, target, reflectedEffects, range, true, exploded);
+        if (!reflectedEffects.mList.empty())
+            inflict(caster, target, reflectedEffects, range, true, exploded);
 
-            if (!appliedLastingEffects.empty())
-            {
-                int casterActorId = -1;
-                if (!caster.isEmpty() && caster.getClass().isActor())
-                    casterActorId = caster.getClass().getCreatureStats(caster).getActorId();
-                target.getClass().getCreatureStats(target).getActiveSpells().addSpell(mId, mStack, appliedLastingEffects,
-                                                                                      mSourceName, casterActorId);
-            }
+        if (!appliedLastingEffects.empty())
+        {
+            int casterActorId = -1;
+            if (!caster.isEmpty() && caster.getClass().isActor())
+                casterActorId = caster.getClass().getCreatureStats(caster).getActorId();
+            target.getClass().getCreatureStats(target).getActiveSpells().addSpell(mId, mStack, appliedLastingEffects,
+                    mSourceName, casterActorId);
         }
     }
 
diff --git a/apps/openmw/mwphysics/closestnotmeconvexresultcallback.cpp b/apps/openmw/mwphysics/actorconvexcallback.cpp
similarity index 92%
rename from apps/openmw/mwphysics/closestnotmeconvexresultcallback.cpp
rename to apps/openmw/mwphysics/actorconvexcallback.cpp
index 27e7a390c4..f99b706d74 100644
--- a/apps/openmw/mwphysics/closestnotmeconvexresultcallback.cpp
+++ b/apps/openmw/mwphysics/actorconvexcallback.cpp
@@ -1,6 +1,6 @@
 #include <mutex>
 
-#include "closestnotmeconvexresultcallback.hpp"
+#include "actorconvexcallback.hpp"
 #include "collisiontype.hpp"
 #include "contacttestwrapper.h"
 
@@ -31,13 +31,13 @@ namespace MWPhysics
         }
     };
 
-    ClosestNotMeConvexResultCallback::ClosestNotMeConvexResultCallback(const btCollisionObject *me, const btVector3 &motion, btScalar minCollisionDot, const btCollisionWorld * world)
+    ActorConvexCallback::ActorConvexCallback(const btCollisionObject *me, const btVector3 &motion, btScalar minCollisionDot, const btCollisionWorld * world)
     : btCollisionWorld::ClosestConvexResultCallback(btVector3(0.0, 0.0, 0.0), btVector3(0.0, 0.0, 0.0)),
       mMe(me), mMotion(motion), mMinCollisionDot(minCollisionDot), mWorld(world)
     {
     }
 
-    btScalar ClosestNotMeConvexResultCallback::addSingleResult(btCollisionWorld::LocalConvexResult& convexResult, bool normalInWorldSpace)
+    btScalar ActorConvexCallback::addSingleResult(btCollisionWorld::LocalConvexResult& convexResult, bool normalInWorldSpace)
     {
         if (convexResult.m_hitCollisionObject == mMe)
             return btScalar(1);
diff --git a/apps/openmw/mwphysics/closestnotmeconvexresultcallback.hpp b/apps/openmw/mwphysics/actorconvexcallback.hpp
similarity index 54%
rename from apps/openmw/mwphysics/closestnotmeconvexresultcallback.hpp
rename to apps/openmw/mwphysics/actorconvexcallback.hpp
index 538721ad80..1c28ee6cc4 100644
--- a/apps/openmw/mwphysics/closestnotmeconvexresultcallback.hpp
+++ b/apps/openmw/mwphysics/actorconvexcallback.hpp
@@ -1,5 +1,5 @@
-#ifndef OPENMW_MWPHYSICS_CLOSESTNOTMECONVEXRESULTCALLBACK_H
-#define OPENMW_MWPHYSICS_CLOSESTNOTMECONVEXRESULTCALLBACK_H
+#ifndef OPENMW_MWPHYSICS_ACTORCONVEXCALLBACK_H
+#define OPENMW_MWPHYSICS_ACTORCONVEXCALLBACK_H
 
 #include <BulletCollision/CollisionDispatch/btCollisionWorld.h>
 
@@ -7,10 +7,10 @@ class btCollisionObject;
 
 namespace MWPhysics
 {
-    class ClosestNotMeConvexResultCallback : public btCollisionWorld::ClosestConvexResultCallback
+    class ActorConvexCallback : public btCollisionWorld::ClosestConvexResultCallback
     {
     public:
-        ClosestNotMeConvexResultCallback(const btCollisionObject *me, const btVector3 &motion, btScalar minCollisionDot, const btCollisionWorld * world);
+        ActorConvexCallback(const btCollisionObject *me, const btVector3 &motion, btScalar minCollisionDot, const btCollisionWorld * world);
 
         btScalar addSingleResult(btCollisionWorld::LocalConvexResult& convexResult,bool normalInWorldSpace) override;
 
diff --git a/apps/openmw/mwphysics/closestnotmerayresultcallback.cpp b/apps/openmw/mwphysics/closestnotmerayresultcallback.cpp
index c3104f8603..32d97d6c75 100644
--- a/apps/openmw/mwphysics/closestnotmerayresultcallback.cpp
+++ b/apps/openmw/mwphysics/closestnotmerayresultcallback.cpp
@@ -7,16 +7,13 @@
 
 #include "../mwworld/class.hpp"
 
-#include "actor.hpp"
-#include "collisiontype.hpp"
-#include "projectile.hpp"
 #include "ptrholder.hpp"
 
 namespace MWPhysics
 {
-    ClosestNotMeRayResultCallback::ClosestNotMeRayResultCallback(const btCollisionObject* me, std::vector<const btCollisionObject*>  targets, const btVector3& from, const btVector3& to, Projectile* proj)
+    ClosestNotMeRayResultCallback::ClosestNotMeRayResultCallback(const btCollisionObject* me, std::vector<const btCollisionObject*>  targets, const btVector3& from, const btVector3& to)
     : btCollisionWorld::ClosestRayResultCallback(from, to)
-    , mMe(me), mTargets(std::move(targets)), mProjectile(proj)
+    , mMe(me), mTargets(std::move(targets))
     {
     }
 
@@ -25,9 +22,6 @@ namespace MWPhysics
         if (rayResult.m_collisionObject == mMe)
             return 1.f;
 
-        if (mProjectile && rayResult.m_collisionObject == mProjectile->getCollisionObject())
-            return 1.f;
-
         if (!mTargets.empty())
         {
             if ((std::find(mTargets.begin(), mTargets.end(), rayResult.m_collisionObject) == mTargets.end()))
@@ -38,27 +32,6 @@ namespace MWPhysics
             }
         }
 
-        btCollisionWorld::ClosestRayResultCallback::addSingleResult(rayResult, normalInWorldSpace);
-        if (mProjectile)
-        {
-            switch (rayResult.m_collisionObject->getBroadphaseHandle()->m_collisionFilterGroup)
-            {
-                case CollisionType_Actor:
-                {
-                    auto* target = static_cast<Actor*>(rayResult.m_collisionObject->getUserPointer());
-                    mProjectile->hit(target->getPtr(), m_hitPointWorld, m_hitNormalWorld);
-                    break;
-                }
-                case CollisionType_Projectile:
-                {
-                    auto* target = static_cast<Projectile*>(rayResult.m_collisionObject->getUserPointer());
-                    target->hit(mProjectile->getPtr(), m_hitPointWorld, m_hitNormalWorld);
-                    mProjectile->hit(target->getPtr(), m_hitPointWorld, m_hitNormalWorld);
-                    break;
-                }
-            }
-        }
-
-        return rayResult.m_hitFraction;
+        return btCollisionWorld::ClosestRayResultCallback::addSingleResult(rayResult, normalInWorldSpace);
     }
 }
diff --git a/apps/openmw/mwphysics/closestnotmerayresultcallback.hpp b/apps/openmw/mwphysics/closestnotmerayresultcallback.hpp
index b86427165a..1fa32ef686 100644
--- a/apps/openmw/mwphysics/closestnotmerayresultcallback.hpp
+++ b/apps/openmw/mwphysics/closestnotmerayresultcallback.hpp
@@ -14,13 +14,13 @@ namespace MWPhysics
     class ClosestNotMeRayResultCallback : public btCollisionWorld::ClosestRayResultCallback
     {
     public:
-        ClosestNotMeRayResultCallback(const btCollisionObject* me, std::vector<const btCollisionObject*> targets, const btVector3& from, const btVector3& to, Projectile* proj=nullptr);
+        ClosestNotMeRayResultCallback(const btCollisionObject* me, std::vector<const btCollisionObject*> targets, const btVector3& from, const btVector3& to);
 
         btScalar addSingleResult(btCollisionWorld::LocalRayResult& rayResult, bool normalInWorldSpace) override;
+
     private:
         const btCollisionObject* mMe;
         const std::vector<const btCollisionObject*> mTargets;
-        Projectile* mProjectile;
     };
 }
 
diff --git a/apps/openmw/mwphysics/physicssystem.cpp b/apps/openmw/mwphysics/physicssystem.cpp
index 95d1ec70aa..ed0e0c915d 100644
--- a/apps/openmw/mwphysics/physicssystem.cpp
+++ b/apps/openmw/mwphysics/physicssystem.cpp
@@ -55,6 +55,7 @@
 #include "deepestnotmecontacttestresultcallback.hpp"
 #include "closestnotmerayresultcallback.hpp"
 #include "contacttestresultcallback.hpp"
+#include "projectileconvexcallback.hpp"
 #include "constants.hpp"
 #include "movementsolver.hpp"
 #include "mtphysics.hpp"
@@ -246,7 +247,7 @@ namespace MWPhysics
         return 0.f;
     }
 
-    RayCastingResult PhysicsSystem::castRay(const osg::Vec3f &from, const osg::Vec3f &to, const MWWorld::ConstPtr& ignore, std::vector<MWWorld::Ptr> targets, int mask, int group, int projId) const
+    RayCastingResult PhysicsSystem::castRay(const osg::Vec3f &from, const osg::Vec3f &to, const MWWorld::ConstPtr& ignore, std::vector<MWWorld::Ptr> targets, int mask, int group) const
     {
         if (from == to)
         {
@@ -283,7 +284,7 @@ namespace MWPhysics
             }
         }
 
-        ClosestNotMeRayResultCallback resultCallback(me, targetCollisionObjects, btFrom, btTo, getProjectile(projId));
+        ClosestNotMeRayResultCallback resultCallback(me, targetCollisionObjects, btFrom, btTo);
         resultCallback.m_collisionFilterGroup = group;
         resultCallback.m_collisionFilterMask = mask;
 
@@ -580,15 +581,44 @@ namespace MWPhysics
         }
     }
 
-    void PhysicsSystem::updateProjectile(const int projectileId, const osg::Vec3f &position)
+    void PhysicsSystem::updateProjectile(const int projectileId, const osg::Vec3f &position) const
     {
-        ProjectileMap::iterator foundProjectile = mProjectiles.find(projectileId);
-        if (foundProjectile != mProjectiles.end())
-        {
-            foundProjectile->second->setPosition(position);
-            mTaskScheduler->updateSingleAabb(foundProjectile->second);
+        const auto foundProjectile = mProjectiles.find(projectileId);
+        assert(foundProjectile != mProjectiles.end());
+        auto* projectile = foundProjectile->second.get();
+
+        btVector3 btFrom = Misc::Convert::toBullet(projectile->getPosition());
+        btVector3 btTo = Misc::Convert::toBullet(position);
+
+        if (btFrom == btTo)
             return;
-        }
+
+        const auto casterPtr = projectile->getCaster();
+        const auto* caster = [this,&casterPtr]() -> const btCollisionObject*
+        {
+            const Actor* actor = getActor(casterPtr);
+            if (actor)
+                return actor->getCollisionObject();
+            const Object* object = getObject(casterPtr);
+            if (object)
+                return object->getCollisionObject();
+            return nullptr;
+        }();
+        assert(caster);
+
+        ProjectileConvexCallback resultCallback(caster, btFrom, btTo, projectile);
+        resultCallback.m_collisionFilterMask = 0xff;
+        resultCallback.m_collisionFilterGroup = CollisionType_Projectile;
+
+        const btQuaternion btrot = btQuaternion::getIdentity();
+        btTransform from_ (btrot, btFrom);
+        btTransform to_ (btrot, btTo);
+
+        mTaskScheduler->convexSweepTest(projectile->getConvexShape(), from_, to_, resultCallback);
+
+        const auto newpos = projectile->isActive() ? position : Misc::Convert::toOsg(resultCallback.m_hitPointWorld);
+        projectile->setPosition(newpos);
+        mTaskScheduler->updateSingleAabb(foundProjectile->second);
     }
 
     void PhysicsSystem::updateRotation(const MWWorld::Ptr &ptr)
@@ -651,10 +681,10 @@ namespace MWPhysics
         mActors.emplace(ptr, std::move(actor));
     }
 
-    int PhysicsSystem::addProjectile (const MWWorld::Ptr& caster, const osg::Vec3f& position)
+    int PhysicsSystem::addProjectile (const MWWorld::Ptr& caster, const osg::Vec3f& position, float radius, bool canTraverseWater)
     {
         mProjectileId++;
-        auto projectile = std::make_shared<Projectile>(mProjectileId, caster, position, mTaskScheduler.get(), this);
+        auto projectile = std::make_shared<Projectile>(caster, position, radius, canTraverseWater, mTaskScheduler.get(), this);
         mProjectiles.emplace(mProjectileId, std::move(projectile));
 
         return mProjectileId;
@@ -863,7 +893,7 @@ namespace MWPhysics
         mWaterCollisionShape.reset(new btStaticPlaneShape(btVector3(0,0,1), mWaterHeight));
         mWaterCollisionObject->setCollisionShape(mWaterCollisionShape.get());
         mTaskScheduler->addCollisionObject(mWaterCollisionObject.get(), CollisionType_Water,
-                                                    CollisionType_Actor);
+                                                    CollisionType_Actor|CollisionType_Projectile);
     }
 
     bool PhysicsSystem::isAreaOccupiedByOtherActor(const osg::Vec3f& position, const float radius, const MWWorld::ConstPtr& ignore) const
diff --git a/apps/openmw/mwphysics/physicssystem.hpp b/apps/openmw/mwphysics/physicssystem.hpp
index 4492099743..6f901067a2 100644
--- a/apps/openmw/mwphysics/physicssystem.hpp
+++ b/apps/openmw/mwphysics/physicssystem.hpp
@@ -124,8 +124,8 @@ namespace MWPhysics
             void addObject (const MWWorld::Ptr& ptr, const std::string& mesh, int collisionType = CollisionType_World);
             void addActor (const MWWorld::Ptr& ptr, const std::string& mesh);
 
-            int addProjectile(const MWWorld::Ptr& caster, const osg::Vec3f& position);
-            void updateProjectile(const int projectileId, const osg::Vec3f &position);
+            int addProjectile(const MWWorld::Ptr& caster, const osg::Vec3f& position, float radius, bool canTraverseWater);
+            void updateProjectile(const int projectileId, const osg::Vec3f &position) const;
             void removeProjectile(const int projectileId);
 
             void updatePtr (const MWWorld::Ptr& old, const MWWorld::Ptr& updated);
@@ -174,7 +174,7 @@ namespace MWPhysics
             /// @param me Optional, a Ptr to ignore in the list of results. targets are actors to filter for, ignoring all other actors.
             RayCastingResult castRay(const osg::Vec3f &from, const osg::Vec3f &to, const MWWorld::ConstPtr& ignore = MWWorld::ConstPtr(),
                     std::vector<MWWorld::Ptr> targets = std::vector<MWWorld::Ptr>(),
-                    int mask = CollisionType_World|CollisionType_HeightMap|CollisionType_Actor|CollisionType_Door, int group=0xff, int projId=-1) const override;
+                    int mask = CollisionType_World|CollisionType_HeightMap|CollisionType_Actor|CollisionType_Door, int group=0xff) const override;
 
             RayCastingResult castSphere(const osg::Vec3f& from, const osg::Vec3f& to, float radius) const override;
 
diff --git a/apps/openmw/mwphysics/projectile.cpp b/apps/openmw/mwphysics/projectile.cpp
index 1b9beca5ff..a931219975 100644
--- a/apps/openmw/mwphysics/projectile.cpp
+++ b/apps/openmw/mwphysics/projectile.cpp
@@ -13,19 +13,22 @@
 #include "../mwworld/class.hpp"
 
 #include "collisiontype.hpp"
+#include "memory"
 #include "mtphysics.hpp"
 #include "projectile.hpp"
 
 namespace MWPhysics
 {
-Projectile::Projectile(int projectileId, const MWWorld::Ptr& caster, const osg::Vec3f& position, PhysicsTaskScheduler* scheduler, PhysicsSystem* physicssystem)
-    : mActive(true)
+Projectile::Projectile(const MWWorld::Ptr& caster, const osg::Vec3f& position, float radius, bool canCrossWaterSurface, PhysicsTaskScheduler* scheduler, PhysicsSystem* physicssystem)
+    : mCanCrossWaterSurface(canCrossWaterSurface)
+    , mCrossedWaterSurface(false)
+    , mActive(true)
     , mCaster(caster)
+    , mWaterHitPosition(std::nullopt)
     , mPhysics(physicssystem)
     , mTaskScheduler(scheduler)
-    , mProjectileId(projectileId)
 {
-    mShape.reset(new btSphereShape(1.f));
+    mShape = std::make_unique<btSphereShape>(radius);
     mConvexShape = static_cast<btConvexShape*>(mShape.get());
 
     mCollisionObject = std::make_unique<btCollisionObject>();
@@ -67,6 +70,17 @@ void Projectile::setPosition(const osg::Vec3f &position)
     mTransformUpdatePending = true;
 }
 
+osg::Vec3f Projectile::getPosition() const
+{
+    std::scoped_lock lock(mMutex);
+    return Misc::Convert::toOsg(mLocalTransform.getOrigin());
+}
+
+bool Projectile::canTraverseWater() const
+{
+    return mCanCrossWaterSurface;
+}
+
 void Projectile::hit(MWWorld::Ptr target, btVector3 pos, btVector3 normal)
 {
     if (!mActive.load(std::memory_order_acquire))
@@ -78,12 +92,6 @@ void Projectile::hit(MWWorld::Ptr target, btVector3 pos, btVector3 normal)
     mActive.store(false, std::memory_order_release);
 }
 
-void Projectile::activate()
-{
-    assert(!mActive);
-    mActive.store(true, std::memory_order_release);
-}
-
 MWWorld::Ptr Projectile::getCaster() const
 {
     std::scoped_lock lock(mMutex);
@@ -108,21 +116,32 @@ bool Projectile::isValidTarget(const MWWorld::Ptr& target) const
     if (mCaster == target)
         return false;
 
-    if (!mValidTargets.empty())
+    if (target.isEmpty() || mValidTargets.empty())
+        return true;
+
+    bool validTarget = false;
+    for (const auto& targetActor : mValidTargets)
     {
-        bool validTarget = false;
-        for (const auto& targetActor : mValidTargets)
+        if (targetActor == target)
         {
-            if (targetActor == target)
-            {
-                validTarget = true;
-                break;
-            }
+            validTarget = true;
+            break;
         }
-
-        return validTarget;
     }
-    return true;
+    return validTarget;
+}
+
+std::optional<btVector3> Projectile::getWaterHitPosition()
+{
+    return std::exchange(mWaterHitPosition, std::nullopt);
+}
+
+void Projectile::setWaterHitPosition(btVector3 pos)
+{
+    if (mCrossedWaterSurface)
+        return;
+    mCrossedWaterSurface = true;
+    mWaterHitPosition = pos;
 }
 
 }
diff --git a/apps/openmw/mwphysics/projectile.hpp b/apps/openmw/mwphysics/projectile.hpp
index 5ae963b9a8..fb50eebde8 100644
--- a/apps/openmw/mwphysics/projectile.hpp
+++ b/apps/openmw/mwphysics/projectile.hpp
@@ -4,6 +4,7 @@
 #include <atomic>
 #include <memory>
 #include <mutex>
+#include <optional>
 
 #include "components/misc/convert.hpp"
 
@@ -32,7 +33,7 @@ namespace MWPhysics
     class Projectile final : public PtrHolder
     {
     public:
-        Projectile(const int projectileId, const MWWorld::Ptr& caster, const osg::Vec3f& position, PhysicsTaskScheduler* scheduler, PhysicsSystem* physicssystem);
+        Projectile(const MWWorld::Ptr& caster, const osg::Vec3f& position, float radius, bool canCrossWaterSurface, PhysicsTaskScheduler* scheduler, PhysicsSystem* physicssystem);
         ~Projectile() override;
 
         btConvexShape* getConvexShape() const { return mConvexShape; }
@@ -40,17 +41,13 @@ namespace MWPhysics
         void commitPositionChange();
 
         void setPosition(const osg::Vec3f& position);
+        osg::Vec3f getPosition() const;
 
         btCollisionObject* getCollisionObject() const
         {
             return mCollisionObject.get();
         }
 
-        int getProjectileId() const
-        {
-            return mProjectileId;
-        }
-
         bool isActive() const
         {
             return mActive.load(std::memory_order_acquire);
@@ -65,18 +62,16 @@ namespace MWPhysics
         MWWorld::Ptr getCaster() const;
         void setCaster(MWWorld::Ptr caster);
 
-        osg::Vec3f getHitPos() const
-        {
-            assert(!mActive);
-            return Misc::Convert::toOsg(mHitPosition);
-        }
+        bool canTraverseWater() const;
 
         void hit(MWWorld::Ptr target, btVector3 pos, btVector3 normal);
-        void activate();
 
         void setValidTargets(const std::vector<MWWorld::Ptr>& targets);
         bool isValidTarget(const MWWorld::Ptr& target) const;
 
+        std::optional<btVector3> getWaterHitPosition();
+        void setWaterHitPosition(btVector3 pos);
+
     private:
 
         std::unique_ptr<btCollisionShape> mShape;
@@ -85,9 +80,12 @@ namespace MWPhysics
         std::unique_ptr<btCollisionObject> mCollisionObject;
         btTransform mLocalTransform;
         bool mTransformUpdatePending;
+        bool mCanCrossWaterSurface;
+        bool mCrossedWaterSurface;
         std::atomic<bool> mActive;
         MWWorld::Ptr mCaster;
         MWWorld::Ptr mHitTarget;
+        std::optional<btVector3> mWaterHitPosition;
         btVector3 mHitPosition;
         btVector3 mHitNormal;
 
@@ -95,15 +93,11 @@ namespace MWPhysics
 
         mutable std::mutex mMutex;
 
-        osg::Vec3f mPosition;
-
         PhysicsSystem *mPhysics;
         PhysicsTaskScheduler *mTaskScheduler;
 
         Projectile(const Projectile&);
         Projectile& operator=(const Projectile&);
-
-        int mProjectileId;
     };
 
 }
diff --git a/apps/openmw/mwphysics/projectileconvexcallback.cpp b/apps/openmw/mwphysics/projectileconvexcallback.cpp
new file mode 100644
index 0000000000..0d0ac87202
--- /dev/null
+++ b/apps/openmw/mwphysics/projectileconvexcallback.cpp
@@ -0,0 +1,67 @@
+#include "../mwworld/class.hpp"
+
+#include "actor.hpp"
+#include "collisiontype.hpp"
+#include "projectile.hpp"
+#include "projectileconvexcallback.hpp"
+#include "ptrholder.hpp"
+
+namespace MWPhysics
+{
+    ProjectileConvexCallback::ProjectileConvexCallback(const btCollisionObject* me, const btVector3& from, const btVector3& to, Projectile* proj)
+        : btCollisionWorld::ClosestConvexResultCallback(from, to)
+        , mMe(me), mProjectile(proj)
+    {
+        assert(mProjectile);
+    }
+
+    btScalar ProjectileConvexCallback::addSingleResult(btCollisionWorld::LocalConvexResult& result, bool normalInWorldSpace)
+    {
+        // don't hit the caster
+        if (result.m_hitCollisionObject == mMe)
+            return 1.f;
+
+        // don't hit the projectile
+        if (result.m_hitCollisionObject == mProjectile->getCollisionObject())
+            return 1.f;
+
+        btCollisionWorld::ClosestConvexResultCallback::addSingleResult(result, normalInWorldSpace);
+        switch (result.m_hitCollisionObject->getBroadphaseHandle()->m_collisionFilterGroup)
+        {
+            case CollisionType_Actor:
+                {
+                    auto* target = static_cast<Actor*>(result.m_hitCollisionObject->getUserPointer());
+                    if (!mProjectile->isValidTarget(target->getPtr()))
+                        return 1.f;
+                    mProjectile->hit(target->getPtr(), result.m_hitPointLocal, result.m_hitNormalLocal);
+                    break;
+                }
+            case CollisionType_Projectile:
+                {
+                    auto* target = static_cast<Projectile*>(result.m_hitCollisionObject->getUserPointer());
+                    if (!mProjectile->isValidTarget(target->getCaster()))
+                        return 1.f;
+                    target->hit(mProjectile->getPtr(), m_hitPointWorld, m_hitNormalWorld);
+                    mProjectile->hit(target->getPtr(), m_hitPointWorld, m_hitNormalWorld);
+                    break;
+                }
+            case CollisionType_Water:
+                {
+                    mProjectile->setWaterHitPosition(m_hitPointWorld);
+                    if (mProjectile->canTraverseWater())
+                        return 1.f;
+                    mProjectile->hit(MWWorld::Ptr(), m_hitPointWorld, m_hitNormalWorld);
+                    break;
+                }
+            default:
+                {
+                    mProjectile->hit(MWWorld::Ptr(), m_hitPointWorld, m_hitNormalWorld);
+                    break;
+                }
+        }
+
+        return result.m_hitFraction;
+    }
+
+}
+
diff --git a/apps/openmw/mwphysics/projectileconvexcallback.hpp b/apps/openmw/mwphysics/projectileconvexcallback.hpp
new file mode 100644
index 0000000000..c687de36c0
--- /dev/null
+++ b/apps/openmw/mwphysics/projectileconvexcallback.hpp
@@ -0,0 +1,27 @@
+#ifndef OPENMW_MWPHYSICS_PROJECTILECONVEXCALLBACK_H
+#define OPENMW_MWPHYSICS_PROJECTILECONVEXCALLBACK_H
+
+#include <vector>
+
+#include <BulletCollision/CollisionDispatch/btCollisionWorld.h>
+
+class btCollisionObject;
+
+namespace MWPhysics
+{
+    class Projectile;
+
+    class ProjectileConvexCallback : public btCollisionWorld::ClosestConvexResultCallback
+    {
+    public:
+        ProjectileConvexCallback(const btCollisionObject* me, const btVector3& from, const btVector3& to, Projectile* proj);
+
+        btScalar addSingleResult(btCollisionWorld::LocalConvexResult& result, bool normalInWorldSpace) override;
+
+    private:
+        const btCollisionObject* mMe;
+        Projectile* mProjectile;
+    };
+}
+
+#endif
diff --git a/apps/openmw/mwphysics/raycasting.hpp b/apps/openmw/mwphysics/raycasting.hpp
index b176e83304..7c8375cb5a 100644
--- a/apps/openmw/mwphysics/raycasting.hpp
+++ b/apps/openmw/mwphysics/raycasting.hpp
@@ -29,7 +29,7 @@ namespace MWPhysics
             /// @param me Optional, a Ptr to ignore in the list of results. targets are actors to filter for, ignoring all other actors.
             virtual RayCastingResult castRay(const osg::Vec3f &from, const osg::Vec3f &to, const MWWorld::ConstPtr& ignore = MWWorld::ConstPtr(),
                     std::vector<MWWorld::Ptr> targets = std::vector<MWWorld::Ptr>(),
-                    int mask = CollisionType_World|CollisionType_HeightMap|CollisionType_Actor|CollisionType_Door, int group=0xff, int projId=-1) const = 0;
+                    int mask = CollisionType_World|CollisionType_HeightMap|CollisionType_Actor|CollisionType_Door, int group=0xff) const = 0;
 
             virtual RayCastingResult castSphere(const osg::Vec3f& from, const osg::Vec3f& to, float radius) const = 0;
 
diff --git a/apps/openmw/mwphysics/trace.cpp b/apps/openmw/mwphysics/trace.cpp
index f50b6100a6..049d026e8e 100644
--- a/apps/openmw/mwphysics/trace.cpp
+++ b/apps/openmw/mwphysics/trace.cpp
@@ -7,7 +7,7 @@
 
 #include "collisiontype.hpp"
 #include "actor.hpp"
-#include "closestnotmeconvexresultcallback.hpp"
+#include "actorconvexcallback.hpp"
 
 namespace MWPhysics
 {
@@ -24,7 +24,7 @@ void ActorTracer::doTrace(const btCollisionObject *actor, const osg::Vec3f& star
     to.setOrigin(btend);
 
     const btVector3 motion = btstart-btend;
-    ClosestNotMeConvexResultCallback newTraceCallback(actor, motion, btScalar(0.0), world);
+    ActorConvexCallback newTraceCallback(actor, motion, btScalar(0.0), world);
     // Inherit the actor's collision group and mask
     newTraceCallback.m_collisionFilterGroup = actor->getBroadphaseHandle()->m_collisionFilterGroup;
     newTraceCallback.m_collisionFilterMask = actor->getBroadphaseHandle()->m_collisionFilterMask;
@@ -62,7 +62,7 @@ void ActorTracer::findGround(const Actor* actor, const osg::Vec3f& start, const
     btTransform to(trans.getBasis(), btend);
 
     const btVector3 motion = btstart-btend;
-    ClosestNotMeConvexResultCallback newTraceCallback(actor->getCollisionObject(), motion, btScalar(0.0), world);
+    ActorConvexCallback newTraceCallback(actor->getCollisionObject(), motion, btScalar(0.0), world);
     // Inherit the actor's collision group and mask
     newTraceCallback.m_collisionFilterGroup = actor->getCollisionObject()->getBroadphaseHandle()->m_collisionFilterGroup;
     newTraceCallback.m_collisionFilterMask = actor->getCollisionObject()->getBroadphaseHandle()->m_collisionFilterMask;
diff --git a/apps/openmw/mwworld/projectilemanager.cpp b/apps/openmw/mwworld/projectilemanager.cpp
index 08c9e46627..c87f625053 100644
--- a/apps/openmw/mwworld/projectilemanager.cpp
+++ b/apps/openmw/mwworld/projectilemanager.cpp
@@ -3,6 +3,7 @@
 #include <iomanip>
 
 #include <memory>
+#include <optional>
 #include <osg/PositionAttitudeTransform>
 
 #include <components/debug/debuglog.hpp>
@@ -43,6 +44,7 @@
 
 #include "../mwsound/sound.hpp"
 
+#include "../mwphysics/collisiontype.hpp"
 #include "../mwphysics/physicssystem.hpp"
 #include "../mwphysics/projectile.hpp"
 
@@ -187,7 +189,7 @@ namespace MWWorld
     };
 
 
-    void ProjectileManager::createModel(State &state, const std::string &model, const osg::Vec3f& pos, const osg::Quat& orient,
+    float ProjectileManager::createModel(State &state, const std::string &model, const osg::Vec3f& pos, const osg::Quat& orient,
                                         bool rotate, bool createLight, osg::Vec4 lightDiffuseColor, std::string texture)
     {
         state.mNode = new osg::PositionAttitudeTransform;
@@ -251,6 +253,7 @@ namespace MWWorld
         state.mNode->accept(assignVisitor);
 
         MWRender::overrideFirstRootTexture(texture, mResourceSystem, projectile);
+        return projectile->getBound().radius();
     }
 
     void ProjectileManager::update(State& state, float duration)
@@ -305,7 +308,7 @@ namespace MWWorld
 
         osg::Vec4 lightDiffuseColor = getMagicBoltLightDiffuseColor(state.mEffects);
 
-        createModel(state, ptr.getClass().getModel(ptr), pos, orient, true, true, lightDiffuseColor, texture);
+        const auto radius = createModel(state, ptr.getClass().getModel(ptr), pos, orient, true, true, lightDiffuseColor, texture);
 
         MWBase::SoundManager *sndMgr = MWBase::Environment::get().getSoundManager();
         for (const std::string &soundid : state.mSoundIds)
@@ -316,7 +319,7 @@ namespace MWWorld
                 state.mSounds.push_back(sound);
         }
 
-        state.mProjectileId = mPhysics->addProjectile(caster, pos);
+        state.mProjectileId = mPhysics->addProjectile(caster, pos, radius, false);
         state.mToDelete = false;
         mMagicBolts.push_back(state);
     }
@@ -340,7 +343,7 @@ namespace MWWorld
         if (!ptr.getClass().getEnchantment(ptr).empty())
             SceneUtil::addEnchantedGlow(state.mNode, mResourceSystem, ptr.getClass().getEnchantmentColor(ptr));
 
-        state.mProjectileId = mPhysics->addProjectile(actor, pos);
+        state.mProjectileId = mPhysics->addProjectile(actor, pos, 1.f, true);
         state.mToDelete = false;
         mProjectiles.push_back(state);
     }
@@ -407,15 +410,7 @@ namespace MWWorld
             float speed = fTargetSpellMaxSpeed * magicBoltState.mSpeed;
             osg::Vec3f direction = orient * osg::Vec3f(0,1,0);
             direction.normalize();
-            osg::Vec3f pos(magicBoltState.mNode->getPosition());
-            osg::Vec3f newPos = pos + direction * duration * speed;
-
-            for (const auto& sound : magicBoltState.mSounds)
-                sound->setPosition(newPos);
-
-            magicBoltState.mNode->setPosition(newPos);
-
-            mPhysics->updateProjectile(magicBoltState.mProjectileId, newPos);
+            osg::Vec3f newPos = projectile->getPosition() + direction * duration * speed;
 
             update(magicBoltState, duration);
 
@@ -425,41 +420,7 @@ namespace MWWorld
                 caster.getClass().getCreatureStats(caster).getAiSequence().getCombatTargets(targetActors);
             projectile->setValidTargets(targetActors);
 
-            // Check for impact
-            // TODO: use a proper btRigidBody / btGhostObject?
-            const auto result = mPhysics->castRay(pos, newPos, caster, targetActors, 0xff, MWPhysics::CollisionType_Projectile, magicBoltState.mProjectileId);
-
-            bool hit = false;
-            if (result.mHit)
-            {
-                hit = true;
-                if (result.mHitObject.isEmpty())
-                {
-                    // terrain or projectile
-                }
-                else
-                {
-                    MWMechanics::CastSpell cast(caster, result.mHitObject);
-                    cast.mHitPosition = pos;
-                    cast.mId = magicBoltState.mSpellId;
-                    cast.mSourceName = magicBoltState.mSourceName;
-                    cast.mStack = false;
-                    cast.inflict(result.mHitObject, caster, magicBoltState.mEffects, ESM::RT_Target, false, true);
-                    mPhysics->reportCollision(Misc::Convert::toBullet(result.mHitPos), Misc::Convert::toBullet(result.mHitNormal));
-                }
-            }
-
-            // Explodes when hitting water
-            if (MWBase::Environment::get().getWorld()->isUnderwater(MWMechanics::getPlayer().getCell(), newPos))
-                hit = true;
-
-            if (hit)
-            {
-                MWBase::Environment::get().getWorld()->explodeSpell(pos, magicBoltState.mEffects, caster, result.mHitObject,
-                                                                    ESM::RT_Target, magicBoltState.mSpellId, magicBoltState.mSourceName);
-
-                cleanupMagicBolt(magicBoltState);
-            }
+            mPhysics->updateProjectile(magicBoltState.mProjectileId, newPos);
         }
     }
 
@@ -467,9 +428,6 @@ namespace MWWorld
     {
         for (auto& projectileState : mProjectiles)
         {
-            if (projectileState.mToDelete)
-                continue;
-
             auto* projectile = mPhysics->getProjectile(projectileState.mProjectileId);
             if (!projectile->isActive())
                 continue;
@@ -477,8 +435,7 @@ namespace MWWorld
             // simulating aerodynamics at all
             projectileState.mVelocity -= osg::Vec3f(0, 0, Constants::GravityConst * Constants::UnitsPerMeter * 0.1f) * duration;
 
-            osg::Vec3f pos(projectileState.mNode->getPosition());
-            osg::Vec3f newPos = pos + projectileState.mVelocity * duration;
+            osg::Vec3f newPos = projectile->getPosition() + projectileState.mVelocity * duration;
 
             // rotation does not work well for throwing projectiles - their roll angle will depend on shooting direction.
             if (!projectileState.mThrown)
@@ -488,10 +445,6 @@ namespace MWWorld
                 projectileState.mNode->setAttitude(orient);
             }
 
-            projectileState.mNode->setPosition(newPos);
-
-            mPhysics->updateProjectile(projectileState.mProjectileId, newPos);
-
             update(projectileState, duration);
 
             MWWorld::Ptr caster = projectileState.getCaster();
@@ -502,36 +455,7 @@ namespace MWWorld
                 caster.getClass().getCreatureStats(caster).getAiSequence().getCombatTargets(targetActors);
             projectile->setValidTargets(targetActors);
 
-            // Check for impact
-            // TODO: use a proper btRigidBody / btGhostObject?
-            const auto result = mPhysics->castRay(pos, newPos, caster, targetActors, 0xff, MWPhysics::CollisionType_Projectile, projectileState.mProjectileId);
-
-            bool underwater = MWBase::Environment::get().getWorld()->isUnderwater(MWMechanics::getPlayer().getCell(), newPos);
-
-            if (result.mHit || underwater)
-            {
-                // Try to get a Ptr to the bow that was used. It might no longer exist.
-                MWWorld::ManualRef projectileRef(MWBase::Environment::get().getWorld()->getStore(), projectileState.mIdArrow);
-                MWWorld::Ptr bow = projectileRef.getPtr();
-                if (!caster.isEmpty() && projectileState.mIdArrow != projectileState.mBowId)
-                {
-                    MWWorld::InventoryStore& inv = caster.getClass().getInventoryStore(caster);
-                    MWWorld::ContainerStoreIterator invIt = inv.getSlot(MWWorld::InventoryStore::Slot_CarriedRight);
-                    if (invIt != inv.end() && Misc::StringUtils::ciEqual(invIt->getCellRef().getRefId(), projectileState.mBowId))
-                        bow = *invIt;
-                }
-
-                if (caster.isEmpty())
-                    caster = result.mHitObject;
-
-                MWMechanics::projectileHit(caster, result.mHitObject, bow, projectileRef.getPtr(), result.mHit ? result.mHitPos : newPos, projectileState.mAttackStrength);
-                mPhysics->reportCollision(Misc::Convert::toBullet(result.mHitPos), Misc::Convert::toBullet(result.mHitNormal));
-
-                if (underwater)
-                    mRendering->emitWaterRipple(newPos);
-
-                cleanupProjectile(projectileState);
-            }
+            mPhysics->updateProjectile(projectileState.mProjectileId, newPos);
         }
     }
 
@@ -543,17 +467,19 @@ namespace MWWorld
                 continue;
 
             auto* projectile = mPhysics->getProjectile(projectileState.mProjectileId);
+
+            if (const auto hitWaterPos = projectile->getWaterHitPosition())
+                mRendering->emitWaterRipple(Misc::Convert::toOsg(*hitWaterPos));
+
+            const auto pos = projectile->getPosition();
+            projectileState.mNode->setPosition(pos);
+
             if (projectile->isActive())
                 continue;
+
             const auto target = projectile->getTarget();
-            const auto pos = projectile->getHitPos();
-            MWWorld::Ptr caster = projectileState.getCaster();
+            auto caster = projectileState.getCaster();
             assert(target != caster);
-            if (!projectile->isValidTarget(target))
-            {
-                projectile->activate();
-                continue;
-            }
 
             if (caster.isEmpty())
                 caster = target;
@@ -569,9 +495,8 @@ namespace MWWorld
                     bow = *invIt;
             }
 
-            projectileState.mHitPosition = pos;
-            cleanupProjectile(projectileState);
             MWMechanics::projectileHit(caster, target, bow, projectileRef.getPtr(), pos, projectileState.mAttackStrength);
+            cleanupProjectile(projectileState);
         }
         for (auto& magicBoltState : mMagicBolts)
         {
@@ -579,20 +504,18 @@ namespace MWWorld
                 continue;
 
             auto* projectile = mPhysics->getProjectile(magicBoltState.mProjectileId);
+
+            const auto pos = projectile->getPosition();
+            magicBoltState.mNode->setPosition(pos);
+            for (const auto& sound : magicBoltState.mSounds)
+                sound->setPosition(pos);
+
             if (projectile->isActive())
                 continue;
+
             const auto target = projectile->getTarget();
-            const auto pos = projectile->getHitPos();
-            MWWorld::Ptr caster = magicBoltState.getCaster();
+            const auto caster = magicBoltState.getCaster();
             assert(target != caster);
-            if (!projectile->isValidTarget(target))
-            {
-                projectile->activate();
-                continue;
-            }
-
-            magicBoltState.mHitPosition = pos;
-            cleanupMagicBolt(magicBoltState);
 
             MWMechanics::CastSpell cast(caster, target);
             cast.mHitPosition = pos;
@@ -602,6 +525,7 @@ namespace MWWorld
             cast.inflict(target, caster, magicBoltState.mEffects, ESM::RT_Target, false, true);
 
             MWBase::Environment::get().getWorld()->explodeSpell(pos, magicBoltState.mEffects, caster, target, ESM::RT_Target, magicBoltState.mSpellId, magicBoltState.mSourceName);
+            cleanupMagicBolt(magicBoltState);
         }
         mProjectiles.erase(std::remove_if(mProjectiles.begin(), mProjectiles.end(), [](const State& state) { return state.mToDelete; }),
                 mProjectiles.end());
@@ -702,7 +626,7 @@ namespace MWWorld
                 int weaponType = ptr.get<ESM::Weapon>()->mBase->mData.mType;
                 state.mThrown = MWMechanics::getWeaponType(weaponType)->mWeaponClass == ESM::WeaponType::Thrown;
 
-                state.mProjectileId = mPhysics->addProjectile(state.getCaster(), osg::Vec3f(esm.mPosition));
+                state.mProjectileId = mPhysics->addProjectile(state.getCaster(), osg::Vec3f(esm.mPosition), 1.f, true);
             }
             catch(...)
             {
@@ -747,7 +671,6 @@ namespace MWWorld
                 MWWorld::ManualRef ref(MWBase::Environment::get().getWorld()->getStore(), state.mIdMagic.at(0));
                 MWWorld::Ptr ptr = ref.getPtr();
                 model = ptr.getClass().getModel(ptr);
-                state.mProjectileId = mPhysics->addProjectile(state.getCaster(), osg::Vec3f(esm.mPosition));
             }
             catch(...)
             {
@@ -755,7 +678,8 @@ namespace MWWorld
             }
 
             osg::Vec4 lightDiffuseColor = getMagicBoltLightDiffuseColor(state.mEffects);
-            createModel(state, model, osg::Vec3f(esm.mPosition), osg::Quat(esm.mOrientation), true, true, lightDiffuseColor, texture);
+            const auto radius = createModel(state, model, osg::Vec3f(esm.mPosition), osg::Quat(esm.mOrientation), true, true, lightDiffuseColor, texture);
+            state.mProjectileId = mPhysics->addProjectile(state.getCaster(), osg::Vec3f(esm.mPosition), radius, false);
 
             MWBase::SoundManager *sndMgr = MWBase::Environment::get().getSoundManager();
             for (const std::string &soundid : state.mSoundIds)
diff --git a/apps/openmw/mwworld/projectilemanager.hpp b/apps/openmw/mwworld/projectilemanager.hpp
index 2cd570847b..e088dd7011 100644
--- a/apps/openmw/mwworld/projectilemanager.hpp
+++ b/apps/openmw/mwworld/projectilemanager.hpp
@@ -80,8 +80,6 @@ namespace MWWorld
             int mActorId;
             int mProjectileId;
 
-            osg::Vec3f mHitPosition;
-
             // TODO: this will break when the game is saved and reloaded, since there is currently
             // no way to write identifiers for non-actors to a savegame.
             MWWorld::Ptr mCasterHandle;
@@ -132,7 +130,7 @@ namespace MWWorld
         void moveProjectiles(float dt);
         void moveMagicBolts(float dt);
 
-        void createModel (State& state, const std::string& model, const osg::Vec3f& pos, const osg::Quat& orient,
+        float createModel (State& state, const std::string& model, const osg::Vec3f& pos, const osg::Quat& orient,
                             bool rotate, bool createLight, osg::Vec4 lightDiffuseColor, std::string texture = "");
         void update (State& state, float duration);