Merge branch 'projectiles_collisions_mk2' into 'master'

Projectiles collisions

See merge request OpenMW/openmw!369

CHANGELOG.md

@@ -8,6 +8,7 @@
     Bug #2473: Unable to overstock merchants
     Bug #2798: Mutable ESM records
     Bug #2976 [reopened]: Issues combining settings from the command line and both config files
+    Bug #3372: Projectiles and magic bolts go through moving targets
     Bug #3676: NiParticleColorModifier isn't applied properly
     Bug #3714: Savegame fails to load due to conflict between SpellState and MagicEffects
     Bug #3789: Crash in visitEffectSources while in battle

apps/openmw/CMakeLists.txt

@@ -66,13 +66,13 @@ add_openmw_dir (mwworld
     cells localscripts customdata inventorystore ptr actionopen actionread actionharvest
     actionequip timestamp actionalchemy cellstore actionapply actioneat
     store esmstore recordcmp fallback actionrepair actionsoulgem livecellref actiondoor
-    contentloader esmloader actiontrap cellreflist cellref physicssystem weather projectilemanager
+    contentloader esmloader actiontrap cellreflist cellref weather projectilemanager
     cellpreloader datetimemanager
     )
 
 add_openmw_dir (mwphysics
     physicssystem trace collisiontype actor convert object heightfield closestnotmerayresultcallback
-    contacttestresultcallback deepestnotmecontacttestresultcallback stepper movementsolver
+    contacttestresultcallback deepestnotmecontacttestresultcallback stepper movementsolver projectile
     closestnotmeconvexresultcallback raycasting mtphysics
     )
 

apps/openmw/mwphysics/actor.cpp

@@ -70,7 +70,7 @@ Actor::Actor(const MWWorld::Ptr& ptr, const Resource::BulletShape* shape, Physic
     mCollisionObject->setCollisionFlags(btCollisionObject::CF_KINEMATIC_OBJECT);
     mCollisionObject->setActivationState(DISABLE_DEACTIVATION);
     mCollisionObject->setCollisionShape(mShape.get());
-    mCollisionObject->setUserPointer(static_cast<PtrHolder*>(this));
+    mCollisionObject->setUserPointer(this);
 
     updateRotation();
     updateScale();

apps/openmw/mwphysics/closestnotmeconvexresultcallback.cpp

@@ -2,6 +2,14 @@
 
 #include <BulletCollision/CollisionDispatch/btCollisionObject.h>
 
+#include <components/misc/convert.hpp>
+
+#include "../mwbase/world.hpp"
+#include "../mwbase/environment.hpp"
+
+#include "collisiontype.hpp"
+#include "projectile.hpp"
+
 namespace MWPhysics
 {
     ClosestNotMeConvexResultCallback::ClosestNotMeConvexResultCallback(const btCollisionObject *me, const btVector3 &motion, btScalar minCollisionDot)
@@ -10,11 +18,26 @@ namespace MWPhysics
     {
     }
 
-    btScalar ClosestNotMeConvexResultCallback::addSingleResult(btCollisionWorld::LocalConvexResult& convexResult,bool normalInWorldSpace)
+    btScalar ClosestNotMeConvexResultCallback::addSingleResult(btCollisionWorld::LocalConvexResult& convexResult, bool normalInWorldSpace)
     {
         if (convexResult.m_hitCollisionObject == mMe)
             return btScalar(1);
 
+        if (convexResult.m_hitCollisionObject->getBroadphaseHandle()->m_collisionFilterGroup == CollisionType_Projectile)
+        {
+            auto* projectileHolder = static_cast<Projectile*>(convexResult.m_hitCollisionObject->getUserPointer());
+            if (!projectileHolder->isActive())
+                return btScalar(1);
+            auto* targetHolder = static_cast<PtrHolder*>(mMe->getUserPointer());
+            const MWWorld::Ptr target = targetHolder->getPtr();
+            // do nothing if we hit the caster. Sometimes the launching origin is inside of caster collision shape
+            if (projectileHolder->getCaster() != target)
+            {
+                projectileHolder->hit(target, convexResult.m_hitPointLocal, convexResult.m_hitNormalLocal);
+                return btScalar(1);
+            }
+        }
+
         btVector3 hitNormalWorld;
         if (normalInWorldSpace)
             hitNormalWorld = convexResult.m_hitNormalLocal;

apps/openmw/mwphysics/closestnotmerayresultcallback.cpp

@@ -1,18 +1,22 @@
 #include "closestnotmerayresultcallback.hpp"
 
 #include <algorithm>
+#include <utility>
 
 #include <BulletCollision/CollisionDispatch/btCollisionObject.h>
 
 #include "../mwworld/class.hpp"
 
+#include "actor.hpp"
+#include "collisiontype.hpp"
+#include "projectile.hpp"
 #include "ptrholder.hpp"
 
 namespace MWPhysics
 {
-    ClosestNotMeRayResultCallback::ClosestNotMeRayResultCallback(const btCollisionObject* me, const std::vector<const btCollisionObject*>& targets, const btVector3& from, const btVector3& to)
+    ClosestNotMeRayResultCallback::ClosestNotMeRayResultCallback(const btCollisionObject* me, std::vector<const btCollisionObject*>  targets, const btVector3& from, const btVector3& to, Projectile* proj)
     : btCollisionWorld::ClosestRayResultCallback(from, to)
-    , mMe(me), mTargets(targets)
+    , mMe(me), mTargets(std::move(targets)), mProjectile(proj)
     {
     }
 
@@ -24,11 +28,27 @@ namespace MWPhysics
         {
             if ((std::find(mTargets.begin(), mTargets.end(), rayResult.m_collisionObject) == mTargets.end()))
             {
-                PtrHolder* holder = static_cast<PtrHolder*>(rayResult.m_collisionObject->getUserPointer());
+                auto* holder = static_cast<PtrHolder*>(rayResult.m_collisionObject->getUserPointer());
                 if (holder && !holder->getPtr().isEmpty() && holder->getPtr().getClass().isActor())
                     return 1.f;
             }
         }
-        return btCollisionWorld::ClosestRayResultCallback::addSingleResult(rayResult, normalInWorldSpace);
+
+        btCollisionWorld::ClosestRayResultCallback::addSingleResult(rayResult, normalInWorldSpace);
+        if (mProjectile)
+        {
+            auto* holder = static_cast<PtrHolder*>(rayResult.m_collisionObject->getUserPointer());
+            if (auto* target = dynamic_cast<Actor*>(holder))
+            {
+                mProjectile->hit(target->getPtr(), m_hitPointWorld, m_hitNormalWorld);
+            }
+            else if (auto* target = dynamic_cast<Projectile*>(holder))
+            {
+                target->hit(mProjectile->getPtr(), m_hitPointWorld, m_hitNormalWorld);
+                mProjectile->hit(target->getPtr(), m_hitPointWorld, m_hitNormalWorld);
+            }
+        }
+
+        return rayResult.m_hitFraction;
     }
 }

apps/openmw/mwphysics/closestnotmerayresultcallback.hpp

@@ -9,15 +9,18 @@ class btCollisionObject;
 
 namespace MWPhysics
 {
+    class Projectile;
+
     class ClosestNotMeRayResultCallback : public btCollisionWorld::ClosestRayResultCallback
     {
     public:
-        ClosestNotMeRayResultCallback(const btCollisionObject* me, const std::vector<const btCollisionObject*>& targets, const btVector3& from, const btVector3& to);
+        ClosestNotMeRayResultCallback(const btCollisionObject* me, std::vector<const btCollisionObject*> targets, const btVector3& from, const btVector3& to, Projectile* proj=nullptr);
 
         btScalar addSingleResult(btCollisionWorld::LocalRayResult& rayResult, bool normalInWorldSpace) override;
     private:
         const btCollisionObject* mMe;
         const std::vector<const btCollisionObject*> mTargets;
+        Projectile* mProjectile;
     };
 }
 

apps/openmw/mwphysics/mtphysics.cpp

@@ -17,6 +17,7 @@
 #include "mtphysics.hpp"
 #include "object.hpp"
 #include "physicssystem.hpp"
+#include "projectile.hpp"
 
 namespace
 {
@@ -455,6 +456,11 @@ namespace MWPhysics
                 object->commitPositionChange();
                 mCollisionWorld->updateSingleAabb(object->getCollisionObject());
             }
+            else if (const auto projectile = std::dynamic_pointer_cast<Projectile>(p))
+            {
+                projectile->commitPositionChange();
+                mCollisionWorld->updateSingleAabb(projectile->getCollisionObject());
+            }
         };
     }
 

apps/openmw/mwphysics/object.cpp

@@ -24,7 +24,7 @@ namespace MWPhysics
         mCollisionObject.reset(new btCollisionObject);
         mCollisionObject->setCollisionShape(shapeInstance->getCollisionShape());
 
-        mCollisionObject->setUserPointer(static_cast<PtrHolder*>(this));
+        mCollisionObject->setUserPointer(this);
 
         setScale(ptr.getCellRef().getScale());
         setRotation(Misc::Convert::toBullet(ptr.getRefData().getBaseNode()->getAttitude()));

apps/openmw/mwphysics/physicssystem.cpp

@@ -46,6 +46,8 @@
 
 #include "collisiontype.hpp"
 #include "actor.hpp"
+
+#include "projectile.hpp"
 #include "trace.h"
 #include "object.hpp"
 #include "heightfield.hpp"
@@ -64,6 +66,7 @@ namespace MWPhysics
         , mResourceSystem(resourceSystem)
         , mDebugDrawEnabled(false)
         , mTimeAccum(0.0f)
+        , mProjectileId(0)
         , mWaterHeight(0)
         , mWaterEnabled(false)
         , mParentNode(parentNode)
@@ -112,7 +115,7 @@ namespace MWPhysics
 
         mObjects.clear();
         mActors.clear();
-
+        mProjectiles.clear();
     }
 
     void PhysicsSystem::setUnrefQueue(SceneUtil::UnrefQueue *unrefQueue)
@@ -248,7 +251,7 @@ 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) 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, int projId) const
     {
         if (from == to)
         {
@@ -285,7 +288,7 @@ namespace MWPhysics
             }
         }
 
-        ClosestNotMeRayResultCallback resultCallback(me, targetCollisionObjects, btFrom, btTo);
+        ClosestNotMeRayResultCallback resultCallback(me, targetCollisionObjects, btFrom, btTo, getProjectile(projId));
         resultCallback.m_collisionFilterGroup = group;
         resultCallback.m_collisionFilterMask = mask;
 
@@ -502,6 +505,13 @@ namespace MWPhysics
         }
     }
 
+    void PhysicsSystem::removeProjectile(const int projectileId)
+    {
+        ProjectileMap::iterator foundProjectile = mProjectiles.find(projectileId);
+        if (foundProjectile != mProjectiles.end())
+            mProjectiles.erase(foundProjectile);
+    }
+
     void PhysicsSystem::updatePtr(const MWWorld::Ptr &old, const MWWorld::Ptr &updated)
     {
         ObjectMap::iterator found = mObjects.find(old);
@@ -553,6 +563,14 @@ namespace MWPhysics
         return nullptr;
     }
 
+    Projectile* PhysicsSystem::getProjectile(int projectileId) const
+    {
+        ProjectileMap::const_iterator found = mProjectiles.find(projectileId);
+        if (found != mProjectiles.end())
+            return found->second.get();
+        return nullptr;
+    }
+
     void PhysicsSystem::updateScale(const MWWorld::Ptr &ptr)
     {
         ObjectMap::iterator found = mObjects.find(ptr);
@@ -572,6 +590,17 @@ namespace MWPhysics
         }
     }
 
+    void PhysicsSystem::updateProjectile(const int projectileId, const osg::Vec3f &position)
+    {
+        ProjectileMap::iterator foundProjectile = mProjectiles.find(projectileId);
+        if (foundProjectile != mProjectiles.end())
+        {
+            foundProjectile->second->setPosition(position);
+            mTaskScheduler->updateSingleAabb(foundProjectile->second);
+            return;
+        }
+    }
+
     void PhysicsSystem::updateRotation(const MWWorld::Ptr &ptr)
     {
         ObjectMap::iterator found = mObjects.find(ptr);
@@ -632,6 +661,15 @@ namespace MWPhysics
         mActors.emplace(ptr, std::move(actor));
     }
 
+    int PhysicsSystem::addProjectile (const MWWorld::Ptr& caster, const osg::Vec3f& position)
+    {
+        mProjectileId++;
+        auto projectile = std::make_shared<Projectile>(mProjectileId, caster, position, mTaskScheduler.get(), this);
+        mProjectiles.emplace(mProjectileId, std::move(projectile));
+
+        return mProjectileId;
+    }
+
     bool PhysicsSystem::toggleCollisionMode()
     {
         ActorMap::iterator found = mActors.find(MWMechanics::getPlayer());

apps/openmw/mwphysics/physicssystem.hpp

@@ -56,6 +56,7 @@ namespace MWPhysics
     class Object;
     class Actor;
     class PhysicsTaskScheduler;
+    class Projectile;
 
     using ActorMap = std::map<MWWorld::ConstPtr, std::shared_ptr<Actor>>;
 
@@ -127,6 +128,10 @@ 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);
+            void removeProjectile(const int projectileId);
+
             void updatePtr (const MWWorld::Ptr& old, const MWWorld::Ptr& updated);
 
             Actor* getActor(const MWWorld::Ptr& ptr);
@@ -134,6 +139,8 @@ namespace MWPhysics
 
             const Object* getObject(const MWWorld::ConstPtr& ptr) const;
 
+            Projectile* getProjectile(int projectileId) const;
+
             // Object or Actor
             void remove (const MWWorld::Ptr& ptr);
 
@@ -141,7 +148,6 @@ namespace MWPhysics
             void updateRotation (const MWWorld::Ptr& ptr);
             void updatePosition (const MWWorld::Ptr& ptr);
 
-
             void addHeightField (const float* heights, int x, int y, float triSize, float sqrtVerts, float minH, float maxH, const osg::Object* holdObject);
 
             void removeHeightField (int x, int y);
@@ -172,7 +178,7 @@ 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) const override;
+                    int mask = CollisionType_World|CollisionType_HeightMap|CollisionType_Actor|CollisionType_Door, int group=0xff, int projId=-1) const override;
 
             RayCastingResult castSphere(const osg::Vec3f& from, const osg::Vec3f& to, float radius) const override;
 
@@ -269,6 +275,9 @@ namespace MWPhysics
 
             ActorMap mActors;
 
+            using ProjectileMap = std::map<int, std::shared_ptr<Projectile>>;
+            ProjectileMap mProjectiles;
+
             using HeightFieldMap = std::map<std::pair<int, int>, HeightField *>;
             HeightFieldMap mHeightFields;
 
@@ -279,6 +288,8 @@ namespace MWPhysics
 
             float mTimeAccum;
 
+            unsigned int mProjectileId;
+
             float mWaterHeight;
             bool mWaterEnabled;
 

apps/openmw/mwphysics/projectile.cpp

@@ -0,0 +1,89 @@
+#include <memory>
+
+#include <BulletCollision/CollisionShapes/btSphereShape.h>
+#include <BulletCollision/CollisionDispatch/btCollisionWorld.h>
+
+#include <LinearMath/btVector3.h>
+
+#include <components/debug/debuglog.hpp>
+#include <components/misc/convert.hpp>
+#include <components/resource/bulletshape.hpp>
+#include <components/sceneutil/positionattitudetransform.hpp>
+
+#include "../mwworld/class.hpp"
+
+#include "collisiontype.hpp"
+#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)
+    , mCaster(caster)
+    , mPhysics(physicssystem)
+    , mTaskScheduler(scheduler)
+    , mProjectileId(projectileId)
+{
+    mShape.reset(new btSphereShape(1.f));
+    mConvexShape = static_cast<btConvexShape*>(mShape.get());
+
+    mCollisionObject.reset(new btCollisionObject);
+    mCollisionObject->setCollisionFlags(btCollisionObject::CF_KINEMATIC_OBJECT);
+    mCollisionObject->setActivationState(DISABLE_DEACTIVATION);
+    mCollisionObject->setCollisionShape(mShape.get());
+    mCollisionObject->setUserPointer(this);
+
+    setPosition(position);
+
+    const int collisionMask = CollisionType_World | CollisionType_HeightMap |
+        CollisionType_Actor | CollisionType_Door | CollisionType_Water | CollisionType_Projectile;
+    mTaskScheduler->addCollisionObject(mCollisionObject.get(), CollisionType_Projectile, collisionMask);
+
+    commitPositionChange();
+}
+
+Projectile::~Projectile()
+{
+    if (mCollisionObject)
+    {
+        if (!mActive)
+            mPhysics->reportCollision(mHitPosition, mHitNormal);
+        mTaskScheduler->removeCollisionObject(mCollisionObject.get());
+    }
+}
+
+void Projectile::commitPositionChange()
+{
+    std::unique_lock<std::mutex> lock(mPositionMutex);
+    if (mTransformUpdatePending)
+    {
+        mCollisionObject->setWorldTransform(mLocalTransform);
+        mTransformUpdatePending = false;
+    }
+}
+
+void Projectile::setPosition(const osg::Vec3f &position)
+{
+    std::unique_lock<std::mutex> lock(mPositionMutex);
+    mLocalTransform.setOrigin(Misc::Convert::toBullet(position));
+    mTransformUpdatePending = true;
+}
+
+void Projectile::hit(MWWorld::Ptr target, btVector3 pos, btVector3 normal)
+{
+    if (!mActive.load(std::memory_order_acquire))
+        return;
+    std::unique_lock<std::mutex> lock(mPositionMutex);
+    mHitTarget = target;
+    mHitPosition = pos;
+    mHitNormal = normal;
+    mActive.store(false, std::memory_order_release);
+}
+
+void Projectile::activate()
+{
+    assert(!mActive);
+    mActive.store(true, std::memory_order_release);
+}
+}

apps/openmw/mwphysics/projectile.hpp

@@ -0,0 +1,106 @@
+#ifndef OPENMW_MWPHYSICS_PROJECTILE_H
+#define OPENMW_MWPHYSICS_PROJECTILE_H
+
+#include <atomic>
+#include <memory>
+#include <mutex>
+
+#include "components/misc/convert.hpp"
+
+#include "ptrholder.hpp"
+
+class btCollisionObject;
+class btCollisionShape;
+class btConvexShape;
+class btVector3;
+
+namespace osg
+{
+    class Vec3f;
+}
+
+namespace Resource
+{
+    class BulletShape;
+}
+
+namespace MWPhysics
+{
+    class PhysicsTaskScheduler;
+    class PhysicsSystem;
+
+    class Projectile final : public PtrHolder
+    {
+    public:
+        Projectile(const int projectileId, const MWWorld::Ptr& caster, const osg::Vec3f& position, PhysicsTaskScheduler* scheduler, PhysicsSystem* physicssystem);
+        ~Projectile() override;
+
+        btConvexShape* getConvexShape() const { return mConvexShape; }
+
+        void commitPositionChange();
+
+        void setPosition(const osg::Vec3f& position);
+
+        btCollisionObject* getCollisionObject() const
+        {
+            return mCollisionObject.get();
+        }
+
+        int getProjectileId() const
+        {
+            return mProjectileId;
+        }
+
+        bool isActive() const
+        {
+            return mActive.load(std::memory_order_acquire);
+        }
+
+        MWWorld::Ptr getTarget() const
+        {
+            assert(!mActive);
+            return mHitTarget;
+        }
+
+        MWWorld::Ptr getCaster() const { return mCaster; }
+
+        osg::Vec3f getHitPos() const
+        {
+            assert(!mActive);
+            return Misc::Convert::toOsg(mHitPosition);
+        }
+
+        void hit(MWWorld::Ptr target, btVector3 pos, btVector3 normal);
+        void activate();
+
+    private:
+
+        std::unique_ptr<btCollisionShape> mShape;
+        btConvexShape* mConvexShape;
+
+        std::unique_ptr<btCollisionObject> mCollisionObject;
+        btTransform mLocalTransform;
+        bool mTransformUpdatePending;
+        std::atomic<bool> mActive;
+        MWWorld::Ptr mCaster;
+        MWWorld::Ptr mHitTarget;
+        btVector3 mHitPosition;
+        btVector3 mHitNormal;
+
+        mutable std::mutex mPositionMutex;
+
+        osg::Vec3f mPosition;
+
+        PhysicsSystem *mPhysics;
+        PhysicsTaskScheduler *mTaskScheduler;
+
+        Projectile(const Projectile&);
+        Projectile& operator=(const Projectile&);
+
+        int mProjectileId;
+    };
+
+}
+
+
+#endif

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) const = 0;
+                    int mask = CollisionType_World|CollisionType_HeightMap|CollisionType_Actor|CollisionType_Door, int group=0xff, int projId=-1) const = 0;
 
             virtual RayCastingResult castSphere(const osg::Vec3f& from, const osg::Vec3f& to, float radius) const = 0;
 

apps/openmw/mwphysics/trace.cpp

@@ -5,6 +5,9 @@
 #include <BulletCollision/CollisionDispatch/btCollisionWorld.h>
 #include <BulletCollision/CollisionShapes/btConvexShape.h>
 
+#include "../mwbase/world.hpp"
+#include "../mwbase/environment.hpp"
+
 #include "collisiontype.hpp"
 #include "actor.hpp"
 #include "closestnotmeconvexresultcallback.hpp"

apps/openmw/mwworld/projectilemanager.cpp

@@ -2,6 +2,7 @@
 
 #include <iomanip>
 
+#include <memory>
 #include <osg/PositionAttitudeTransform>
 
 #include <components/debug/debuglog.hpp>
@@ -43,6 +44,7 @@
 #include "../mwsound/sound.hpp"
 
 #include "../mwphysics/physicssystem.hpp"
+#include "../mwphysics/projectile.hpp"
 
 namespace
 {
@@ -284,7 +286,7 @@ namespace MWWorld
         else
             state.mActorId = -1;
 
-        std::string texture = "";
+        std::string texture;
 
         state.mEffects = getMagicBoltData(state.mIdMagic, state.mSoundIds, state.mSpeed, texture, state.mSourceName, state.mSpellId);
 
@@ -302,6 +304,7 @@ namespace MWWorld
         MWWorld::Ptr ptr = ref.getPtr();
 
         osg::Vec4 lightDiffuseColor = getMagicBoltLightDiffuseColor(state.mEffects);
+
         createModel(state, ptr.getClass().getModel(ptr), pos, orient, true, true, lightDiffuseColor, texture);
 
         MWBase::SoundManager *sndMgr = MWBase::Environment::get().getSoundManager();
@@ -312,7 +315,9 @@ namespace MWWorld
             if (sound)
                 state.mSounds.push_back(sound);
         }
-            
+
+        state.mProjectileId = mPhysics->addProjectile(caster, pos);
+        state.mToDelete = false;
         mMagicBolts.push_back(state);
     }
 
@@ -325,7 +330,6 @@ namespace MWWorld
         state.mIdArrow = projectile.getCellRef().getRefId();
         state.mCasterHandle = actor;
         state.mAttackStrength = attackStrength;
-
         int type = projectile.get<ESM::Weapon>()->mBase->mData.mType;
         state.mThrown = MWMechanics::getWeaponType(type)->mWeaponClass == ESM::WeaponType::Thrown;
 
@@ -336,6 +340,8 @@ namespace MWWorld
         if (!ptr.getClass().getEnchantment(ptr).empty())
             SceneUtil::addEnchantedGlow(state.mNode, mResourceSystem, ptr.getClass().getEnchantmentColor(ptr));
 
+        state.mProjectileId = mPhysics->addProjectile(actor, pos);
+        state.mToDelete = false;
         mProjectiles.push_back(state);
     }
 
@@ -360,63 +366,58 @@ namespace MWWorld
                 return (state.mNode->getPosition() - playerPos).length2() >= farawayThreshold*farawayThreshold;
             };
 
-            for (std::vector<ProjectileState>::iterator it = mProjectiles.begin(); it != mProjectiles.end();)
+            for (auto& projectileState : mProjectiles)
             {
-                if (isCleanable(*it))
-                {
-                    cleanupProjectile(*it);
-                    it = mProjectiles.erase(it);
-                }
-                else
-                    ++it;
+                if (isCleanable(projectileState))
+                    cleanupProjectile(projectileState);
             }
 
-            for (std::vector<MagicBoltState>::iterator it = mMagicBolts.begin(); it != mMagicBolts.end();)
+            for (auto& magicBoltState : mMagicBolts)
             {
-                if (isCleanable(*it))
-                {
-                    cleanupMagicBolt(*it);
-                    it = mMagicBolts.erase(it);
-                }
-                else
-                    ++it;
+                if (isCleanable(magicBoltState))
+                    cleanupMagicBolt(magicBoltState);
             }
         }
     }
 
     void ProjectileManager::moveMagicBolts(float duration)
     {
-        for (std::vector<MagicBoltState>::iterator it = mMagicBolts.begin(); it != mMagicBolts.end();)
+        for (auto& magicBoltState : mMagicBolts)
         {
+            if (magicBoltState.mToDelete)
+                continue;
+
+            const auto* projectile = mPhysics->getProjectile(magicBoltState.mProjectileId);
+            if (!projectile->isActive())
+                continue;
             // If the actor caster is gone, the magic bolt needs to be removed from the scene during the next frame.
-            MWWorld::Ptr caster = it->getCaster();
+            MWWorld::Ptr caster = magicBoltState.getCaster();
             if (!caster.isEmpty() && caster.getClass().isActor())
             {
                 if (caster.getRefData().getCount() <= 0 || caster.getClass().getCreatureStats(caster).isDead())
                 {
-                    cleanupMagicBolt(*it);
-                    it = mMagicBolts.erase(it);
+                    cleanupMagicBolt(magicBoltState);
                     continue;
                 }
             }
 
-            osg::Quat orient = it->mNode->getAttitude();
+            osg::Quat orient = magicBoltState.mNode->getAttitude();
             static float fTargetSpellMaxSpeed = MWBase::Environment::get().getWorld()->getStore().get<ESM::GameSetting>()
                         .find("fTargetSpellMaxSpeed")->mValue.getFloat();
-            float speed = fTargetSpellMaxSpeed * it->mSpeed;
+            float speed = fTargetSpellMaxSpeed * magicBoltState.mSpeed;
             osg::Vec3f direction = orient * osg::Vec3f(0,1,0);
             direction.normalize();
-            osg::Vec3f pos(it->mNode->getPosition());
+            osg::Vec3f pos(magicBoltState.mNode->getPosition());
             osg::Vec3f newPos = pos + direction * duration * speed;
 
-            for (size_t soundIter = 0; soundIter != it->mSounds.size(); soundIter++)
-            {
-                it->mSounds.at(soundIter)->setPosition(newPos);
-            }
+            for (const auto& sound : magicBoltState.mSounds)
+                sound->setPosition(newPos);
 
-            it->mNode->setPosition(newPos);
+            magicBoltState.mNode->setPosition(newPos);
 
-            update(*it, duration);
+            mPhysics->updateProjectile(magicBoltState.mProjectileId, newPos);
+
+            update(magicBoltState, duration);
 
             // For AI actors, get combat targets to use in the ray cast. Only those targets will return a positive hit result.
             std::vector<MWWorld::Ptr> targetActors;
@@ -425,7 +426,7 @@ namespace MWWorld
 
             // Check for impact
             // TODO: use a proper btRigidBody / btGhostObject?
-            MWPhysics::RayCastingResult result = mPhysics->castRay(pos, newPos, caster, targetActors, 0xff, MWPhysics::CollisionType_Projectile);
+            const auto result = mPhysics->castRay(pos, newPos, caster, targetActors, 0xff, MWPhysics::CollisionType_Projectile, magicBoltState.mProjectileId);
 
             bool hit = false;
             if (result.mHit)
@@ -433,16 +434,16 @@ namespace MWWorld
                 hit = true;
                 if (result.mHitObject.isEmpty())
                 {
-                    // terrain
+                    // terrain or projectile
                 }
                 else
                 {
                     MWMechanics::CastSpell cast(caster, result.mHitObject);
                     cast.mHitPosition = pos;
-                    cast.mId = it->mSpellId;
-                    cast.mSourceName = it->mSourceName;
+                    cast.mId = magicBoltState.mSpellId;
+                    cast.mSourceName = magicBoltState.mSourceName;
                     cast.mStack = false;
-                    cast.inflict(result.mHitObject, caster, it->mEffects, ESM::RT_Target, false, true);
+                    cast.inflict(result.mHitObject, caster, magicBoltState.mEffects, ESM::RT_Target, false, true);
                     mPhysics->reportCollision(Misc::Convert::toBullet(result.mHitPos), Misc::Convert::toBullet(result.mHitNormal));
                 }
             }
@@ -453,47 +454,46 @@ namespace MWWorld
 
             if (hit)
             {
-                MWBase::Environment::get().getWorld()->explodeSpell(pos, it->mEffects, caster, result.mHitObject,
-                                                                    ESM::RT_Target, it->mSpellId, it->mSourceName);
-
-                MWBase::SoundManager *sndMgr = MWBase::Environment::get().getSoundManager();
-                for (size_t soundIter = 0; soundIter != it->mSounds.size(); soundIter++)
-                    sndMgr->stopSound(it->mSounds.at(soundIter));
+                MWBase::Environment::get().getWorld()->explodeSpell(pos, magicBoltState.mEffects, caster, result.mHitObject,
+                                                                    ESM::RT_Target, magicBoltState.mSpellId, magicBoltState.mSourceName);
 
-                mParent->removeChild(it->mNode);
-
-                it = mMagicBolts.erase(it);
-                continue;
+                cleanupMagicBolt(magicBoltState);
             }
-            else
-                ++it;
         }
     }
 
     void ProjectileManager::moveProjectiles(float duration)
     {
-        for (std::vector<ProjectileState>::iterator it = mProjectiles.begin(); it != mProjectiles.end();)
+        for (auto& projectileState : mProjectiles)
         {
+            if (projectileState.mToDelete)
+                continue;
+
+            const auto* projectile = mPhysics->getProjectile(projectileState.mProjectileId);
+            if (!projectile->isActive())
+                continue;
             // gravity constant - must be way lower than the gravity affecting actors, since we're not
             // simulating aerodynamics at all
-            it->mVelocity -= osg::Vec3f(0, 0, Constants::GravityConst * Constants::UnitsPerMeter * 0.1f) * duration;
+            projectileState.mVelocity -= osg::Vec3f(0, 0, Constants::GravityConst * Constants::UnitsPerMeter * 0.1f) * duration;
 
-            osg::Vec3f pos(it->mNode->getPosition());
-            osg::Vec3f newPos = pos + it->mVelocity * duration;
+            osg::Vec3f pos(projectileState.mNode->getPosition());
+            osg::Vec3f newPos = pos + projectileState.mVelocity * duration;
 
             // rotation does not work well for throwing projectiles - their roll angle will depend on shooting direction.
-            if (!it->mThrown)
+            if (!projectileState.mThrown)
             {
                 osg::Quat orient;
-                orient.makeRotate(osg::Vec3f(0,1,0), it->mVelocity);
-                it->mNode->setAttitude(orient);
+                orient.makeRotate(osg::Vec3f(0,1,0), projectileState.mVelocity);
+                projectileState.mNode->setAttitude(orient);
             }
 
-            it->mNode->setPosition(newPos);
+            projectileState.mNode->setPosition(newPos);
+
+            mPhysics->updateProjectile(projectileState.mProjectileId, newPos);
 
-            update(*it, duration);
+            update(projectileState, duration);
 
-            MWWorld::Ptr caster = it->getCaster();
+            MWWorld::Ptr caster = projectileState.getCaster();
 
             // For AI actors, get combat targets to use in the ray cast. Only those targets will return a positive hit result.
             std::vector<MWWorld::Ptr> targetActors;
@@ -502,50 +502,149 @@ namespace MWWorld
 
             // Check for impact
             // TODO: use a proper btRigidBody / btGhostObject?
-            MWPhysics::RayCastingResult result = mPhysics->castRay(pos, newPos, caster, targetActors, 0xff, MWPhysics::CollisionType_Projectile);
+            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)
             {
-                MWWorld::ManualRef projectileRef(MWBase::Environment::get().getWorld()->getStore(), it->mIdArrow);
-
                 // 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() && it->mIdArrow != it->mBowId)
+                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(), it->mBowId))
+                    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, it->mAttackStrength);
+                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);
 
-                mParent->removeChild(it->mNode);
-                it = mProjectiles.erase(it);
+                cleanupProjectile(projectileState);
+            }
+        }
+    }
+
+    void ProjectileManager::processHits()
+    {
+        for (auto& projectileState : mProjectiles)
+        {
+            if (projectileState.mToDelete)
+                continue;
+
+            auto* projectile = mPhysics->getProjectile(projectileState.mProjectileId);
+            if (projectile->isActive())
+                continue;
+            const auto target = projectile->getTarget();
+            const auto pos = projectile->getHitPos();
+            MWWorld::Ptr caster = projectileState.getCaster();
+            assert(target != caster);
+            if (!isValidTarget(caster, target))
+            {
+                projectile->activate();
+                continue;
+            }
+
+            if (caster.isEmpty())
+                caster = target;
+
+            // 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;
+            }
+
+            projectileState.mHitPosition = pos;
+            cleanupProjectile(projectileState);
+            MWMechanics::projectileHit(caster, target, bow, projectileRef.getPtr(), pos, projectileState.mAttackStrength);
+        }
+        for (auto& magicBoltState : mMagicBolts)
+        {
+            if (magicBoltState.mToDelete)
+                continue;
+
+            auto* projectile = mPhysics->getProjectile(magicBoltState.mProjectileId);
+            if (projectile->isActive())
+                continue;
+            const auto target = projectile->getTarget();
+            const auto pos = projectile->getHitPos();
+            MWWorld::Ptr caster = magicBoltState.getCaster();
+            assert(target != caster);
+            if (!isValidTarget(caster, target))
+            {
+                projectile->activate();
                 continue;
             }
 
-            ++it;
+            magicBoltState.mHitPosition = pos;
+            cleanupMagicBolt(magicBoltState);
+
+            MWMechanics::CastSpell cast(caster, target);
+            cast.mHitPosition = pos;
+            cast.mId = magicBoltState.mSpellId;
+            cast.mSourceName = magicBoltState.mSourceName;
+            cast.mStack = false;
+            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);
+        }
+        mProjectiles.erase(std::remove_if(mProjectiles.begin(), mProjectiles.end(), [](const State& state) { return state.mToDelete; }),
+                mProjectiles.end());
+        mMagicBolts.erase(std::remove_if(mMagicBolts.begin(), mMagicBolts.end(), [](const State& state) { return state.mToDelete; }),
+                mMagicBolts.end());
+    }
+
+    bool ProjectileManager::isValidTarget(const MWWorld::Ptr& caster, const MWWorld::Ptr& target)
+    {
+        // For AI actors, get combat targets to use in the ray cast. Only those targets will return a positive hit result.
+        std::vector<MWWorld::Ptr> targetActors;
+        if (!caster.isEmpty() && caster.getClass().isActor() && caster != MWMechanics::getPlayer())
+        {
+            caster.getClass().getCreatureStats(caster).getAiSequence().getCombatTargets(targetActors);
+            if (!targetActors.empty())
+            {
+                bool validTarget = false;
+                for (MWWorld::Ptr& targetActor : targetActors)
+                {
+                    if (targetActor == target)
+                    {
+                        validTarget = true;
+                        break;
+                    }
+                }
+
+                return validTarget;
+            }
         }
+
+        return true;
     }
 
     void ProjectileManager::cleanupProjectile(ProjectileManager::ProjectileState& state)
     {
         mParent->removeChild(state.mNode);
+        mPhysics->removeProjectile(state.mProjectileId);
+        state.mToDelete = true;
     }
 
     void ProjectileManager::cleanupMagicBolt(ProjectileManager::MagicBoltState& state)
     {
         mParent->removeChild(state.mNode);
+        mPhysics->removeProjectile(state.mProjectileId);
+        state.mToDelete = true;
         for (size_t soundIter = 0; soundIter != state.mSounds.size(); soundIter++)
         {
             MWBase::Environment::get().getSoundManager()->stopSound(state.mSounds.at(soundIter));
@@ -554,15 +653,12 @@ namespace MWWorld
 
     void ProjectileManager::clear()
     {
-        for (std::vector<ProjectileState>::iterator it = mProjectiles.begin(); it != mProjectiles.end(); ++it)
-        {
-            cleanupProjectile(*it);
-        }
+        for (auto& mProjectile : mProjectiles)
+            cleanupProjectile(mProjectile);
         mProjectiles.clear();
-        for (std::vector<MagicBoltState>::iterator it = mMagicBolts.begin(); it != mMagicBolts.end(); ++it)
-        {
-            cleanupMagicBolt(*it);
-        }
+
+        for (auto& mMagicBolt : mMagicBolts)
+            cleanupMagicBolt(mMagicBolt);
         mMagicBolts.clear();
     }
 
@@ -619,6 +715,7 @@ namespace MWWorld
             state.mVelocity = esm.mVelocity;
             state.mIdArrow = esm.mId;
             state.mAttackStrength = esm.mAttackStrength;
+            state.mToDelete = false;
 
             std::string model;
             try
@@ -626,9 +723,10 @@ namespace MWWorld
                 MWWorld::ManualRef ref(MWBase::Environment::get().getWorld()->getStore(), esm.mId);
                 MWWorld::Ptr ptr = ref.getPtr();
                 model = ptr.getClass().getModel(ptr);
-
                 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));
             }
             catch(...)
             {
@@ -640,7 +738,7 @@ namespace MWWorld
             mProjectiles.push_back(state);
             return true;
         }
-        else if (type == ESM::REC_MPRJ)
+        if (type == ESM::REC_MPRJ)
         {
             ESM::MagicBoltState esm;
             esm.load(reader);
@@ -649,7 +747,8 @@ namespace MWWorld
             state.mIdMagic.push_back(esm.mId);
             state.mSpellId = esm.mSpellId;
             state.mActorId = esm.mActorId;
-            std::string texture = "";
+            state.mToDelete = false;
+            std::string texture;
 
             try
             {
@@ -672,6 +771,7 @@ 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(...)
             {

apps/openmw/mwworld/projectilemanager.hpp

@@ -56,6 +56,8 @@ namespace MWWorld
 
         void update(float dt);
 
+        void processHits();
+
         /// Removes all current projectiles. Should be called when switching to a new worldspace.
         void clear();
 
@@ -76,6 +78,9 @@ namespace MWWorld
             std::shared_ptr<MWRender::EffectAnimationTime> mEffectAnimationTime;
 
             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.
@@ -88,6 +93,8 @@ namespace MWWorld
 
             // MW-id of an arrow projectile
             std::string mIdArrow;
+
+            bool mToDelete;
         };
 
         struct MagicBoltState : public State
@@ -125,6 +132,8 @@ namespace MWWorld
         void moveProjectiles(float dt);
         void moveMagicBolts(float dt);
 
+        bool isValidTarget(const MWWorld::Ptr& caster, const MWWorld::Ptr& target);
+
         void 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);

apps/openmw/mwworld/worldimp.cpp

@@ -1493,6 +1493,7 @@ namespace MWWorld
         mProjectileManager->update(duration);
 
         const auto results = mPhysics->applyQueuedMovement(duration, mDiscardMovements, frameStart, frameNumber, stats);
+        mProjectileManager->processHits();
         mDiscardMovements = false;
 
         for(const auto& [actor, position]: results)