Merge branch 'skating-olympics' into 'master'

De-jank stationary animations

Closes #3330

See merge request OpenMW/openmw!3631

CHANGELOG.md

@@ -2,6 +2,7 @@
 ------
 
     Bug #2623: Snowy Granius doesn't prioritize conjuration spells
+    Bug #3330: Backward displacement of the character when attacking in 3rd person
     Bug #3438: NPCs can't hit bull netch with melee weapons
     Bug #3842: Body part skeletons override the main skeleton
     Bug #4127: Weapon animation looks choppy

apps/openmw/mwbase/world.hpp

@@ -295,9 +295,13 @@ namespace MWBase
         /// relative to \a referenceObject (but the object may be placed somewhere else if the wanted location is
         /// obstructed).
 
-        virtual void queueMovement(const MWWorld::Ptr& ptr, const osg::Vec3f& velocity) = 0;
+        virtual void queueMovement(
+            const MWWorld::Ptr& ptr, const osg::Vec3f& velocity, float duration, bool jump = false)
+            = 0;
         ///< Queues movement for \a ptr (in local space), to be applied in the next call to
         /// doPhysics.
+        /// \param duration The duration this speed shall be held, starting at current simulation time
+        /// \param jump Whether the movement shall be run over time, or immediately added as inertia instead
 
         virtual void updateAnimatedCollisionShape(const MWWorld::Ptr& ptr) = 0;
 

apps/openmw/mwmechanics/character.cpp

@@ -2421,7 +2421,9 @@ namespace MWMechanics
                 }
 
                 if (!isMovementAnimationControlled() && !isScriptedAnimPlaying())
-                    world->queueMovement(mPtr, vec);
+                {
+                    world->queueMovement(mPtr, vec, duration, mInJump && mJumpState == JumpState_None);
+                }
             }
 
             movement = vec;
@@ -2494,7 +2496,7 @@ namespace MWMechanics
             }
 
             // Update movement
-            world->queueMovement(mPtr, movement);
+            world->queueMovement(mPtr, movement, duration, mInJump && mJumpState == JumpState_None);
         }
 
         mSkipAnim = false;

apps/openmw/mwphysics/movementsolver.cpp

@@ -170,6 +170,8 @@ namespace MWPhysics
         }
 
         // Now that we have the effective movement vector, apply wind forces to it
+        // TODO: This will cause instability in idle animations and other in-place animations. Should include a flag for
+        // this when queueing up movement
         if (worldData.mIsInStorm && velocity.length() > 0)
         {
             osg::Vec3f stormDirection = worldData.mStormDirection;
@@ -200,7 +202,8 @@ namespace MWPhysics
 
         for (int iterations = 0; iterations < sMaxIterations && remainingTime > 0.0001f; ++iterations)
         {
-            osg::Vec3f nextpos = newPosition + velocity * remainingTime;
+            osg::Vec3f diff = velocity * remainingTime;
+            osg::Vec3f nextpos = newPosition + diff;
             bool underwater = newPosition.z() < swimlevel;
 
             // If not able to fly, don't allow to swim up into the air
@@ -212,7 +215,11 @@ namespace MWPhysics
                 continue; // velocity updated, calculate nextpos again
             }
 
-            if ((newPosition - nextpos).length2() > 0.0001)
+            // Note, we use an epsilon of 1e-6 instead of std::numeric_limits<float>::epsilon() to avoid doing extremely
+            // small steps. But if we make it any larger we'll start rejecting subtle movements from e.g. idle
+            // animations. Note that, although both these comparisons to 1e-6 are logically the same, they test separate
+            // floating point accuracy cases.
+            if (diff.length2() > 1e-6 && (newPosition - nextpos).length2() > 1e-6)
             {
                 // trace to where character would go if there were no obstructions
                 tracer.doTrace(actor.mCollisionObject, newPosition, nextpos, collisionWorld, actor.mIsOnGround);

apps/openmw/mwphysics/mtphysics.cpp

@@ -25,6 +25,7 @@
 #include "../mwrender/bulletdebugdraw.hpp"
 
 #include "../mwworld/class.hpp"
+#include "../mwworld/datetimemanager.hpp"
 
 #include "../mwbase/environment.hpp"
 #include "../mwbase/world.hpp"
@@ -35,6 +36,7 @@
 #include "object.hpp"
 #include "physicssystem.hpp"
 #include "projectile.hpp"
+#include "ptrholder.hpp"
 
 namespace MWPhysics
 {
@@ -195,6 +197,67 @@ namespace
             void operator()(MWPhysics::ProjectileSimulation& /*sim*/) const {}
         };
 
+        struct InitMovement
+        {
+            int mSteps = 0;
+            float mDelta = 0.f;
+            float mSimulationTime = 0.f;
+
+            // Returns how the actor or projectile wants to move between startTime and endTime
+            osg::Vec3f takeMovement(MWPhysics::PtrHolder& actor, float startTime, float endTime) const
+            {
+                osg::Vec3f movement = osg::Vec3f();
+                actor.eraseMovementIf([&](MWPhysics::Movement& v) {
+                    if (v.mJump)
+                        return false;
+                    float start = std::max(v.mSimulationTimeStart, startTime);
+                    float stop = std::min(v.mSimulationTimeStop, endTime);
+                    movement += v.mVelocity * (stop - start);
+                    if (std::abs(stop - v.mSimulationTimeStop) < 0.0001f)
+                        return true;
+                    return false;
+                });
+
+                return movement;
+            }
+
+            std::optional<osg::Vec3f> takeInertia(MWPhysics::PtrHolder& actor, float startTime) const
+            {
+                std::optional<osg::Vec3f> inertia = std::nullopt;
+                actor.eraseMovementIf([&](MWPhysics::Movement& v) {
+                    if (v.mJump && v.mSimulationTimeStart >= startTime)
+                    {
+                        inertia = v.mVelocity;
+                        return true;
+                    }
+                    return false;
+                });
+                return inertia;
+            }
+
+            void operator()(auto& sim) const
+            {
+                if (mSteps <= 0 || mDelta < 0.00001f)
+                    return;
+
+                auto locked = sim.lock();
+                if (!locked.has_value())
+                    return;
+
+                auto& [ptrHolder, frameDataRef] = *locked;
+
+                // Because takeMovement() returns movement instead of velocity, convert it back to velocity for the
+                // movement solver
+                osg::Vec3f velocity
+                    = takeMovement(*ptrHolder, mSimulationTime, mSimulationTime + mDelta * mSteps) / (mSteps * mDelta);
+                // takeInertia() returns a velocity and should be taken over the velocity calculated above to initiate a
+                // jump
+                auto inertia = takeInertia(*ptrHolder, mSimulationTime);
+
+                frameDataRef.get().mMovement += inertia.value_or(velocity);
+            }
+        };
+
         struct PreStep
         {
             btCollisionWorld* mCollisionWorld;
@@ -501,18 +564,18 @@ namespace MWPhysics
         return std::make_tuple(numSteps, actualDelta);
     }
 
-    void PhysicsTaskScheduler::applyQueuedMovements(float& timeAccum, std::vector<Simulation>& simulations,
-        osg::Timer_t frameStart, unsigned int frameNumber, osg::Stats& stats)
+    void PhysicsTaskScheduler::applyQueuedMovements(float& timeAccum, float simulationTime,
+        std::vector<Simulation>& simulations, osg::Timer_t frameStart, unsigned int frameNumber, osg::Stats& stats)
     {
         assert(mSimulations != &simulations);
 
         waitForWorkers();
-        prepareWork(timeAccum, simulations, frameStart, frameNumber, stats);
+        prepareWork(timeAccum, simulationTime, simulations, frameStart, frameNumber, stats);
         if (mWorkersSync != nullptr)
             mWorkersSync->wakeUpWorkers();
     }
 
-    void PhysicsTaskScheduler::prepareWork(float& timeAccum, std::vector<Simulation>& simulations,
+    void PhysicsTaskScheduler::prepareWork(float& timeAccum, float simulationTime, std::vector<Simulation>& simulations,
         osg::Timer_t frameStart, unsigned int frameNumber, osg::Stats& stats)
     {
         // This function run in the main thread.
@@ -522,6 +585,9 @@ namespace MWPhysics
 
         double timeStart = mTimer->tick();
 
+        // The simulation time when the movement solving begins.
+        float simulationTimeStart = simulationTime - timeAccum;
+
         // start by finishing previous background computation
         if (mNumThreads != 0)
         {
@@ -536,10 +602,15 @@ namespace MWPhysics
         timeAccum -= numSteps * newDelta;
 
         // init
-        const Visitors::InitPosition vis{ mCollisionWorld };
+        const Visitors::InitPosition initPositionVisitor{ mCollisionWorld };
         for (auto& sim : simulations)
         {
-            std::visit(vis, sim);
+            std::visit(initPositionVisitor, sim);
+        }
+        const Visitors::InitMovement initMovementVisitor{ numSteps, newDelta, simulationTimeStart };
+        for (auto& sim : simulations)
+        {
+            std::visit(initMovementVisitor, sim);
         }
         mPrevStepCount = numSteps;
         mRemainingSteps = numSteps;
@@ -552,10 +623,10 @@ namespace MWPhysics
         mNextJob.store(0, std::memory_order_release);
 
         if (mAdvanceSimulation)
+        {
             mWorldFrameData = std::make_unique<WorldFrameData>();
-
-        if (mAdvanceSimulation)
             mBudgetCursor += 1;
+        }
 
         if (mNumThreads == 0)
         {
@@ -864,6 +935,7 @@ namespace MWPhysics
                 std::remove_if(mLOSCache.begin(), mLOSCache.end(), [](const LOSRequest& req) { return req.mStale; }),
                 mLOSCache.end());
         }
+
         mTimeEnd = mTimer->tick();
         if (mWorkersSync != nullptr)
             mWorkersSync->workIsDone();

apps/openmw/mwphysics/mtphysics.hpp

@@ -46,8 +46,8 @@ namespace MWPhysics
         /// @param timeAccum accumulated time from previous run to interpolate movements
         /// @param actorsData per actor data needed to compute new positions
         /// @return new position of each actor
-        void applyQueuedMovements(float& timeAccum, std::vector<Simulation>& simulations, osg::Timer_t frameStart,
-            unsigned int frameNumber, osg::Stats& stats);
+        void applyQueuedMovements(float& timeAccum, float simulationTime, std::vector<Simulation>& simulations,
+            osg::Timer_t frameStart, unsigned int frameNumber, osg::Stats& stats);
 
         void resetSimulation(const ActorMap& actors);
 
@@ -87,8 +87,8 @@ namespace MWPhysics
         void afterPostSim();
         void syncWithMainThread();
         void waitForWorkers();
-        void prepareWork(float& timeAccum, std::vector<Simulation>& simulations, osg::Timer_t frameStart,
-            unsigned int frameNumber, osg::Stats& stats);
+        void prepareWork(float& timeAccum, float simulationTime, std::vector<Simulation>& simulations,
+            osg::Timer_t frameStart, unsigned int frameNumber, osg::Stats& stats);
 
         std::unique_ptr<WorldFrameData> mWorldFrameData;
         std::vector<Simulation>* mSimulations = nullptr;

apps/openmw/mwphysics/physicssystem.cpp

@@ -43,6 +43,7 @@
 #include "../mwrender/bulletdebugdraw.hpp"
 
 #include "../mwworld/class.hpp"
+#include "../mwworld/datetimemanager.hpp"
 
 #include "actor.hpp"
 #include "collisiontype.hpp"
@@ -623,18 +624,20 @@ namespace MWPhysics
         return false;
     }
 
-    void PhysicsSystem::queueObjectMovement(const MWWorld::Ptr& ptr, const osg::Vec3f& velocity)
+    void PhysicsSystem::queueObjectMovement(
+        const MWWorld::Ptr& ptr, const osg::Vec3f& velocity, float duration, bool jump)
     {
+        float start = MWBase::Environment::get().getWorld()->getTimeManager()->getSimulationTime();
         ActorMap::iterator found = mActors.find(ptr.mRef);
         if (found != mActors.end())
-            found->second->setVelocity(velocity);
+            found->second->queueMovement(velocity, start, start + duration, jump);
     }
 
     void PhysicsSystem::clearQueuedMovement()
     {
         for (const auto& [_, actor] : mActors)
         {
-            actor->setVelocity(osg::Vec3f());
+            actor->clearMovement();
             actor->setInertialForce(osg::Vec3f());
         }
     }
@@ -722,8 +725,10 @@ namespace MWPhysics
         {
             std::vector<Simulation>& simulations = mSimulations[mSimulationsCounter++ % mSimulations.size()];
             prepareSimulation(mTimeAccum >= mPhysicsDt, simulations);
+            float simulationTime = MWBase::Environment::get().getWorld()->getTimeManager()->getSimulationTime() + dt;
             // modifies mTimeAccum
-            mTaskScheduler->applyQueuedMovements(mTimeAccum, simulations, frameStart, frameNumber, stats);
+            mTaskScheduler->applyQueuedMovements(
+                mTimeAccum, simulationTime, simulations, frameStart, frameNumber, stats);
         }
     }
 
@@ -907,7 +912,7 @@ namespace MWPhysics
                         ->mValue.getFloat()))
         , mSlowFall(slowFall)
         , mRotation()
-        , mMovement(actor.velocity())
+        , mMovement()
         , mWaterlevel(waterlevel)
         , mHalfExtentsZ(actor.getHalfExtents().z())
         , mOldHeight(0)
@@ -922,7 +927,7 @@ namespace MWPhysics
 
     ProjectileFrameData::ProjectileFrameData(Projectile& projectile)
         : mPosition(projectile.getPosition())
-        , mMovement(projectile.velocity())
+        , mMovement()
         , mCaster(projectile.getCasterCollisionObject())
         , mCollisionObject(projectile.getCollisionObject())
         , mProjectile(&projectile)

apps/openmw/mwphysics/physicssystem.hpp

@@ -245,7 +245,8 @@ namespace MWPhysics
 
         /// Queues velocity movement for a Ptr. If a Ptr is already queued, its velocity will
         /// be overwritten. Valid until the next call to stepSimulation
-        void queueObjectMovement(const MWWorld::Ptr& ptr, const osg::Vec3f& velocity);
+        void queueObjectMovement(
+            const MWWorld::Ptr& ptr, const osg::Vec3f& velocity, float duration, bool jump = false);
 
         /// Clear the queued movements list without applying.
         void clearQueuedMovement();

apps/openmw/mwphysics/ptrholder.hpp

@@ -1,6 +1,7 @@
 #ifndef OPENMW_MWPHYSICS_PTRHOLDER_H
 #define OPENMW_MWPHYSICS_PTRHOLDER_H
 
+#include <list>
 #include <memory>
 #include <mutex>
 #include <utility>
@@ -13,6 +14,14 @@
 
 namespace MWPhysics
 {
+    struct Movement
+    {
+        osg::Vec3f mVelocity = osg::Vec3f();
+        float mSimulationTimeStart = 0.f; // The time at which this movement begun
+        float mSimulationTimeStop = 0.f; // The time at which this movement finished
+        bool mJump = false;
+    };
+
     class PtrHolder
     {
     public:
@@ -32,9 +41,13 @@ namespace MWPhysics
 
         btCollisionObject* getCollisionObject() const { return mCollisionObject.get(); }
 
-        void setVelocity(osg::Vec3f velocity) { mVelocity = velocity; }
+        void clearMovement() { mMovement = {}; }
+        void queueMovement(osg::Vec3f velocity, float simulationTimeStart, float simulationTimeStop, bool jump = false)
+        {
+            mMovement.push_back(Movement{ velocity, simulationTimeStart, simulationTimeStop, jump });
+        }
 
-        osg::Vec3f velocity() { return std::exchange(mVelocity, osg::Vec3f()); }
+        void eraseMovementIf(const auto& predicate) { std::erase_if(mMovement, predicate); }
 
         void setSimulationPosition(const osg::Vec3f& position) { mSimulationPosition = position; }
 
@@ -53,7 +66,7 @@ namespace MWPhysics
     protected:
         MWWorld::Ptr mPtr;
         std::unique_ptr<btCollisionObject> mCollisionObject;
-        osg::Vec3f mVelocity;
+        std::list<Movement> mMovement;
         osg::Vec3f mSimulationPosition;
         osg::Vec3d mPosition;
         osg::Vec3d mPreviousPosition;