bool isEnvironmentCompatible(const MWWorld::Ptr& attacker, const MWWorld::Ptr& victim)
{
const MWWorld::Class& attackerClass = attacker.getClass();
MWBase::World* world = MWBase::Environment::get().getWorld();
// If attacker is fish, victim must be in water
if (attackerClass.isPureWaterCreature(attacker))
{
return world->isWading(victim);
}
// If attacker can't swim, victim must not be in water
if (!attackerClass.canSwim(attacker))
{
return !world->isSwimming(victim);
}
return true;
}
/*
* Current AiCombat movement states (as of 0.29.0), ignoring the details of the
* attack states such as CombatMove, Strike and ReadyToAttack:
*
* +----(within strike range)----->attack--(beyond strike range)-->follow
* | | ^ | |
* | | | | |
* pursue<---(beyond follow range)-----+ +----(within strike range)---+ |
* ^ |
* | |
* +-------------------------(beyond follow range)--------------------+
*
*
* Below diagram is high level only, the code detail is a little different
* (but including those detail will just complicate the diagram w/o adding much)
*
* +----------(same)-------------->attack---------(same)---------->follow
* | |^^ |||
* | ||| |||
* | +--(same)-----------------+|+----------(same)------------+||
* | | | ||
* | | | (in range) ||
* | <---+ (too far) | ||
* pursue<-------------------------[door open]<-----+ ||
* ^^^ | ||
* ||| | ||
* ||+----------evade-----+ | ||
* || | [closed door] | ||
* |+----> maybe stuck, check --------------> back up, check door ||
* | ^ | ^ | ^ ||
* | | | | | | ||
* | | +---+ +---+ ||
* | +-------------------------------------------------------+|
* | |
* +---------------------------(same)---------------------------------+
*
* FIXME:
*
* The new scheme is way too complicated, should really be implemented as a
* proper state machine.
*
* TODO:
*
* Use the Observer Pattern to co-ordinate attacks, provide intelligence on
* whether the target was hit, etc.
*/
bool AiCombat::execute (const MWWorld::Ptr& actor, AiState& state, float duration)
{
// get or create temporary storage
AiCombatStorage& storage = state.get<AiCombatStorage>();
//General description
if(actor.getClass().getCreatureStats(actor).isDead())
return true;
MWWorld::Ptr target = MWBase::Environment::get().getWorld()->searchPtrViaActorId(mTargetActorId);
if (target.isEmpty())
return false;
if(!target.getRefData().getCount() || !target.getRefData().isEnabled() // Really we should be checking whether the target is currently registered
// with the MechanicsManager
|| target.getClass().getCreatureStats(target).isDead())
return true;
const MWWorld::Class& actorClass = actor.getClass();
MWBase::World* world = MWBase::Environment::get().getWorld();
//Update every frame
bool& combatMove = storage.mCombatMove;
float& timerCombatMove = storage.mTimerCombatMove;
MWMechanics::Movement& movement = storage.mMovement;
if(combatMove)
{
timerCombatMove -= duration;
if( timerCombatMove <= 0)
{
timerCombatMove = 0;
movement.mPosition[1] = movement.mPosition[0] = 0;
combatMove = false;
}
}
actorClass.getMovementSettings(actor) = movement;
actorClass.getMovementSettings(actor).mRotation[0] = 0;
actorClass.getMovementSettings(actor).mRotation[2] = 0;
if(movement.mRotation[2] != 0)
{
if(zTurn(actor, Ogre::Degree(movement.mRotation[2]))) movement.mRotation[2] = 0;
}
if(movement.mRotation[0] != 0)
{
if(smoothTurn(actor, Ogre::Degree(movement.mRotation[0]), 0)) movement.mRotation[0] = 0;
}
//TODO: Some skills affect period of strikes.For berserk-like style period ~ 0.25f
float attacksPeriod = 1.0f;
ESM::Weapon::AttackType attackType;
bool& attack = storage.mAttack;
bool& readyToAttack = storage.mReadyToAttack;
float& timerAttack = storage.mTimerAttack;
bool& minMaxAttackDurationInitialised = storage.mMinMaxAttackDurationInitialised;
float (&minMaxAttackDuration)[3][2] = storage.mMinMaxAttackDuration;
if(readyToAttack)
{
if (!minMaxAttackDurationInitialised)
{
// TODO: this must be updated when a different weapon is equipped
getMinMaxAttackDuration(actor, minMaxAttackDuration);
minMaxAttackDurationInitialised = true;
}
if (timerAttack < 0) attack = false;
timerAttack -= duration;
}
else
{
timerAttack = -attacksPeriod;
attack = false;
}
actorClass.getCreatureStats(actor).setAttackingOrSpell(attack);
float& actionCooldown = storage.mActionCooldown;
actionCooldown -= duration;
float& timerReact = storage.mTimerReact;
float tReaction = 0.25f;
if(timerReact < tReaction)
{
timerReact += duration;
return false;
}
//Update with period = tReaction
// Stop attacking if target is not seen
if (target.getClass().getCreatureStats(target).getMagicEffects().get(ESM::MagicEffect::Invisibility).getMagnitude() > 0
|| target.getClass().getCreatureStats(target).getMagicEffects().get(ESM::MagicEffect::Chameleon).getMagnitude() > 75)
{
movement.mPosition[1] = movement.mPosition[0] = 0;
return false; // TODO: run away instead of doing nothing
}
timerReact = 0;
const MWWorld::CellStore*& currentCell = storage.mCell;
bool cellChange = currentCell && (actor.getCell() != currentCell);
if(!currentCell || cellChange)
{
currentCell = actor.getCell();
}
MWRender::Animation* anim = MWBase::Environment::get().getWorld()->getAnimation(actor);
if (!anim) // shouldn't happen
return false;
actorClass.getCreatureStats(actor).setMovementFlag(CreatureStats::Flag_Run, true);
if (actionCooldown > 0)
return false;
float rangeAttack = 0;
float rangeFollow = 0;
boost::shared_ptr<Action>& currentAction = storage.mCurrentAction;
if (anim->upperBodyReady())
{
currentAction = prepareNextAction(actor, target);
actionCooldown = currentAction->getActionCooldown();
}
if (currentAction.get())
currentAction->getCombatRange(rangeAttack, rangeFollow);
// FIXME: consider moving this stuff to ActionWeapon::getCombatRange
const ESM::Weapon *weapon = NULL;
MWMechanics::WeaponType weaptype = WeapType_None;
float weapRange = 1.0f;
// Get weapon characteristics
if (actorClass.hasInventoryStore(actor))
{
// TODO: Check equipped weapon and equip a different one if we can't attack with it
// (e.g. no ammunition, or wrong type of ammunition equipped, etc. autoEquip is not very smart in this regard))
//Get weapon speed and range
MWWorld::ContainerStoreIterator weaponSlot =
MWMechanics::getActiveWeapon(actorClass.getCreatureStats(actor), actorClass.getInventoryStore(actor), &weaptype);
if (weaptype == WeapType_HandToHand)
{
static float fHandToHandReach =
world->getStore().get<ESM::GameSetting>().find("fHandToHandReach")->getFloat();
weapRange = fHandToHandReach;
}
else if (weaptype != WeapType_PickProbe && weaptype != WeapType_Spell && weaptype != WeapType_None)
{
// All other WeapTypes are actually weapons, so get<ESM::Weapon> is safe.
weapon = weaponSlot->get<ESM::Weapon>()->mBase;
weapRange = weapon->mData.mReach;
}
weapRange *= 100.0f;
}
else //is creature
{
weaptype = actorClass.getCreatureStats(actor).getDrawState() == DrawState_Spell ? WeapType_Spell : WeapType_HandToHand;
weapRange = 150.0f; //TODO: use true attack range (the same problem in Creature::hit)
}
bool distantCombat = false;
if (weaptype != WeapType_Spell)
{
// TODO: move to ActionWeapon
if (weaptype == WeapType_BowAndArrow || weaptype == WeapType_Crossbow || weaptype == WeapType_Thrown)
{
rangeAttack = 1000;
rangeFollow = 0; // not needed in ranged combat
distantCombat = true;
}
else
{
rangeAttack = weapRange;
rangeFollow = 300;
}
}
else
{
distantCombat = (rangeAttack > 500);
weapRange = 150.f;
}
float& strength = storage.mStrength;
// start new attack
if(readyToAttack)
{
if(timerAttack <= -attacksPeriod)
{
attack = true; // attack starts just now
if (!distantCombat) attackType = chooseBestAttack(weapon, movement);
else attackType = ESM::Weapon::AT_Chop; // cause it's =0
strength = OEngine::Misc::Rng::rollClosedProbability();
// Note: may be 0 for some animations
timerAttack = minMaxAttackDuration[attackType][0] +
(minMaxAttackDuration[attackType][1] - minMaxAttackDuration[attackType][0]) * strength;
//say a provoking combat phrase
if (actor.getClass().isNpc())
{
const MWWorld::ESMStore &store = world->getStore();
int chance = store.get<ESM::GameSetting>().find("iVoiceAttackOdds")->getInt();
if (OEngine::Misc::Rng::roll0to99() < chance)
{
MWBase::Environment::get().getDialogueManager()->say(actor, "attack");
}
}
}
}
/*
* Some notes on meanings of variables:
*
* rangeAttack:
*
* - Distance where attack using the actor's weapon is possible:
* longer for ranged weapons (obviously?) vs. melee weapons
* - Determined by weapon's reach parameter; hardcoded value
* for ranged weapon and for creatures
* - Once within this distance mFollowTarget is triggered
*
* rangeFollow:
*
* - Applies to melee weapons or hand to hand only (or creatures without
* weapons)
* - Distance a little further away than the actor's weapon reach
* i.e. rangeFollow > rangeAttack for melee weapons
* - Hardcoded value (0 for ranged weapons)
* - Once the target gets beyond this distance mFollowTarget is cleared
* and a path to the target needs to be found
*
* mFollowTarget:
*
* - Once triggered, the actor follows the target with LOS shortcut
* (the shortcut really only applies to cells where pathgrids are
* available, since the default path without pathgrids is direct to
* target even if LOS is not achieved)
*/
ESM::Position pos = actor.getRefData().getPosition();
Ogre::Vector3 vActorPos(pos.pos);
Ogre::Vector3 vTargetPos(target.getRefData().getPosition().pos);
Ogre::Vector3 vDirToTarget = vTargetPos - vActorPos;
float distToTarget = vDirToTarget.length();
Ogre::Vector3& lastActorPos = storage.mLastActorPos;
bool& followTarget = storage.mFollowTarget;
bool isStuck = false;
float speed = 0.0f;
if(movement.mPosition[1] && (lastActorPos - vActorPos).length() < (speed = actorClass.getSpeed(actor)) * tReaction / 2)
isStuck = true;
lastActorPos = vActorPos;
// check if actor can move along z-axis
bool canMoveByZ = (actorClass.canSwim(actor) && world->isSwimming(actor))
|| world->isFlying(actor);
// for distant combat we should know if target is in LOS even if distToTarget < rangeAttack
bool inLOS = distantCombat ? world->getLOS(actor, target) : true;
// can't fight if attacker can't go where target is. E.g. A fish can't attack person on land.
if (distToTarget >= rangeAttack
&& !actorClass.isNpc() && !MWMechanics::isEnvironmentCompatible(actor, target))
{
// TODO: start fleeing?
movement.mPosition[0] = 0;
movement.mPosition[1] = 0;
movement.mPosition[2] = 0;
readyToAttack = false;
actorClass.getCreatureStats(actor).setAttackingOrSpell(false);
return false;
}
// (within attack dist) || (not quite attack dist while following)
if(inLOS && (distToTarget < rangeAttack || (distToTarget <= rangeFollow && followTarget && !isStuck)))
{
//Melee and Close-up combat
// getXAngleToDir determines vertical angle to target:
// if actor can move along z-axis it will control movement dir
// if can't - it will control correct aiming.
// note: in getZAngleToDir if we preserve dir.z then horizontal angle can be inaccurate
if (distantCombat)
{
Ogre::Vector3& lastTargetPos = storage.mLastTargetPos;
Ogre::Vector3 vAimDir = AimDirToMovingTarget(actor, target, lastTargetPos, tReaction, weaptype, strength);
lastTargetPos = vTargetPos;
movement.mRotation[0] = getXAngleToDir(vAimDir);
movement.mRotation[2] = getZAngleToDir(vAimDir);
}
else
{
movement.mRotation[0] = getXAngleToDir(vDirToTarget, distToTarget);
movement.mRotation[2] = getZAngleToDir(vDirToTarget);
}
// (not quite attack dist while following)
if (followTarget && distToTarget > rangeAttack)
{
//Close-up combat: just run up on target
movement.mPosition[1] = 1;
}
else // (within attack dist)
{
if(movement.mPosition[0] || movement.mPosition[1])
{
timerCombatMove = 0.1f + 0.1f * OEngine::Misc::Rng::rollClosedProbability();
combatMove = true;
}
// only NPCs are smart enough to use dodge movements
else if(actorClass.isNpc() && (!distantCombat || (distantCombat && distToTarget < rangeAttack/2)))
{
//apply sideway movement (kind of dodging) with some probability
if (OEngine::Misc::Rng::rollClosedProbability() < 0.25)
{
movement.mPosition[0] = OEngine::Misc::Rng::rollProbability() < 0.5 ? 1.0f : -1.0f;
timerCombatMove = 0.05f + 0.15f * OEngine::Misc::Rng::rollClosedProbability();
combatMove = true;
}
}
if(distantCombat && distToTarget < rangeAttack/4)
{
movement.mPosition[1] = -1;
}
readyToAttack = true;
//only once got in melee combat, actor is allowed to use close-up shortcutting
followTarget = true;
}
}
else // remote pathfinding
{
bool preferShortcut = false;
if (!distantCombat) inLOS = world->getLOS(actor, target);
// check if shortcut is available
bool& forceNoShortcut = storage.mForceNoShortcut;
ESM::Position& shortcutFailPos = storage.mShortcutFailPos;
if(inLOS && (!isStuck || readyToAttack)
&& (!forceNoShortcut || (Ogre::Vector3(shortcutFailPos.pos) - vActorPos).length() >= PATHFIND_SHORTCUT_RETRY_DIST))
{
if(speed == 0.0f) speed = actorClass.getSpeed(actor);
// maximum dist before pit/obstacle for actor to avoid them depending on his speed
float maxAvoidDist = tReaction * speed + speed / MAX_VEL_ANGULAR.valueRadians() * 2; // *2 - for reliability
preferShortcut = checkWayIsClear(vActorPos, vTargetPos, Ogre::Vector3(vDirToTarget.x, vDirToTarget.y, 0).length() > maxAvoidDist*1.5? maxAvoidDist : maxAvoidDist/2);
}
// don't use pathgrid when actor can move in 3 dimensions
if(canMoveByZ) preferShortcut = true;
if(preferShortcut)
{
if (canMoveByZ)
movement.mRotation[0] = getXAngleToDir(vDirToTarget, distToTarget);
movement.mRotation[2] = getZAngleToDir(vDirToTarget);
forceNoShortcut = false;
shortcutFailPos.pos[0] = shortcutFailPos.pos[1] = shortcutFailPos.pos[2] = 0;
mPathFinder.clearPath();
}
else // if shortcut failed stick to path grid
{
if(!isStuck && shortcutFailPos.pos[0] == 0.0f && shortcutFailPos.pos[1] == 0.0f && shortcutFailPos.pos[2] == 0.0f)
{
forceNoShortcut = true;
shortcutFailPos = pos;
}
followTarget = false;
buildNewPath(actor, target); //may fail to build a path, check before use
//delete visited path node
mPathFinder.checkPathCompleted(pos.pos[0],pos.pos[1]);
// This works on the borders between the path grid and areas with no waypoints.
if(inLOS && mPathFinder.getPath().size() > 1)
{
// get point just before target
std::list<ESM::Pathgrid::Point>::const_iterator pntIter = --mPathFinder.getPath().end();
--pntIter;
Ogre::Vector3 vBeforeTarget(PathFinder::MakeOgreVector3(*pntIter));
// if current actor pos is closer to target then last point of path (excluding target itself) then go straight on target
if(distToTarget <= (vTargetPos - vBeforeTarget).length())
{
movement.mRotation[2] = getZAngleToDir(vDirToTarget);
preferShortcut = true;
}
}
// if there is no new path, then go straight on target
if(!preferShortcut)
{
if(!mPathFinder.getPath().empty())
movement.mRotation[2] = mPathFinder.getZAngleToNext(pos.pos[0], pos.pos[1]);
else
movement.mRotation[2] = getZAngleToDir(vDirToTarget);
}
}
movement.mPosition[1] = 1;
if (readyToAttack)
{
// to stop possible sideway moving after target moved out of attack range
combatMove = true;
timerCombatMove = 0;
}
readyToAttack = false;
}
if(!isStuck && distToTarget > rangeAttack && !distantCombat)
{
//special run attack; it shouldn't affect melee combat tactics
if(actorClass.getMovementSettings(actor).mPosition[1] == 1)
{
/* check if actor can overcome the distance = distToTarget - attackerWeapRange
less than in time of swinging with weapon (t_swing), then start attacking
*/
float speed1 = actorClass.getSpeed(actor);
float speed2 = target.getClass().getSpeed(target);
if(target.getClass().getMovementSettings(target).mPosition[0] == 0
&& target.getClass().getMovementSettings(target).mPosition[1] == 0)
speed2 = 0;
float s1 = distToTarget - weapRange;
float t = s1/speed1;
float s2 = speed2 * t;
float t_swing =
minMaxAttackDuration[ESM::Weapon::AT_Thrust][0] +
(minMaxAttackDuration[ESM::Weapon::AT_Thrust][1] - minMaxAttackDuration[ESM::Weapon::AT_Thrust][0]) * OEngine::Misc::Rng::rollClosedProbability();
if (t + s2/speed1 <= t_swing)
{
readyToAttack = true;
if(timerAttack <= -attacksPeriod)
{
timerAttack = t_swing;
attack = true;
}
}
}
}
// NOTE: This section gets updated every tReaction, which is currently hard
// coded at 250ms or 1/4 second
//
// TODO: Add a parameter to vary DURATION_SAME_SPOT?
if((distToTarget > rangeAttack || followTarget) &&
mObstacleCheck.check(actor, tReaction)) // check if evasive action needed
{
// probably walking into another NPC TODO: untested in combat situation
// TODO: diagonal should have same animation as walk forward
// but doesn't seem to do that?
actor.getClass().getMovementSettings(actor).mPosition[0] = 1;
actor.getClass().getMovementSettings(actor).mPosition[1] = 0.1f;
// change the angle a bit, too
if(mPathFinder.isPathConstructed())
zTurn(actor, Ogre::Degree(mPathFinder.getZAngleToNext(pos.pos[0] + 1, pos.pos[1])));
if(followTarget)
followTarget = false;
// FIXME: can fool actors to stay behind doors, etc.
// Related to Bug#1102 and to some degree #1155 as well
}
return false;
}
void RenderingManager::update (float duration, bool paused)
{
if (MWBase::Environment::get().getStateManager()->getState()==
MWBase::StateManager::State_NoGame)
return;
MWBase::World *world = MWBase::Environment::get().getWorld();
MWWorld::Ptr player = world->getPlayerPtr();
int blind = player.getClass().getCreatureStats(player).getMagicEffects().get(ESM::MagicEffect::Blind).getMagnitude();
MWBase::Environment::get().getWindowManager()->setScreenFactor(std::max(0.f, 1.f-(blind / 100.f)));
setAmbientMode();
// player position
MWWorld::RefData &data = player.getRefData();
Ogre::Vector3 playerPos(data.getPosition().pos);
mCamera->setCameraDistance();
if(!mCamera->isFirstPerson())
{
Ogre::Vector3 orig, dest;
mCamera->getPosition(orig, dest);
btVector3 btOrig(orig.x, orig.y, orig.z);
btVector3 btDest(dest.x, dest.y, dest.z);
std::pair<bool,float> test = mPhysicsEngine->sphereCast(mRendering.getCamera()->getNearClipDistance()*2.5, btOrig, btDest);
if(test.first)
mCamera->setCameraDistance(test.second * orig.distance(dest), false, false);
}
// Sink the camera while sneaking
bool isSneaking = player.getClass().getCreatureStats(player).getStance(MWMechanics::CreatureStats::Stance_Sneak);
bool isInAir = !world->isOnGround(player);
bool isSwimming = world->isSwimming(player);
static const int i1stPersonSneakDelta = MWBase::Environment::get().getWorld()->getStore().get<ESM::GameSetting>()
.find("i1stPersonSneakDelta")->getInt();
if(!paused && isSneaking && !(isSwimming || isInAir))
mCamera->setSneakOffset(i1stPersonSneakDelta);
mOcclusionQuery->update(duration);
mRendering.update(duration);
Ogre::ControllerManager::getSingleton().setTimeFactor(paused ? 0.f : 1.f);
Ogre::Vector3 cam = mRendering.getCamera()->getRealPosition();
applyFog(world->isUnderwater(player.getCell(), cam));
mCamera->update(duration, paused);
Ogre::SceneNode *node = data.getBaseNode();
Ogre::Quaternion orient = node->_getDerivedOrientation();
mLocalMap->updatePlayer(playerPos, orient);
if(paused)
return;
mEffectManager->update(duration, mRendering.getCamera());
mActors->update (mRendering.getCamera());
mPlayerAnimation->preRender(mRendering.getCamera());
mObjects->update (duration, mRendering.getCamera());
mSkyManager->update(duration);
mSkyManager->setGlare(mOcclusionQuery->getSunVisibility());
mWater->updateUnderwater(world->isUnderwater(player.getCell(), cam));
mWater->update(duration, playerPos);
}
bool AiCombat::reactionTimeActions(const MWWorld::Ptr& actor, CharacterController& characterController,
AiCombatStorage& storage, MWWorld::Ptr target)
{
MWMechanics::Movement& movement = storage.mMovement;
if (isTargetMagicallyHidden(target))
{
storage.stopAttack();
return false; // TODO: run away instead of doing nothing
}
const MWWorld::CellStore*& currentCell = storage.mCell;
bool cellChange = currentCell && (actor.getCell() != currentCell);
if(!currentCell || cellChange)
{
currentCell = actor.getCell();
}
const MWWorld::Class& actorClass = actor.getClass();
actorClass.getCreatureStats(actor).setMovementFlag(CreatureStats::Flag_Run, true);
float& actionCooldown = storage.mActionCooldown;
if (actionCooldown > 0)
return false;
float rangeAttack = 0;
float rangeFollow = 0;
boost::shared_ptr<Action>& currentAction = storage.mCurrentAction;
if (characterController.readyToPrepareAttack())
{
currentAction = prepareNextAction(actor, target);
actionCooldown = currentAction->getActionCooldown();
}
if (currentAction.get())
currentAction->getCombatRange(rangeAttack, rangeFollow);
// FIXME: consider moving this stuff to ActionWeapon::getCombatRange
const ESM::Weapon *weapon = NULL;
MWMechanics::WeaponType weaptype = WeapType_None;
float weapRange = 1.0f;
// Get weapon characteristics
MWBase::World* world = MWBase::Environment::get().getWorld();
if (actorClass.hasInventoryStore(actor))
{
//Get weapon range
MWWorld::ContainerStoreIterator weaponSlot =
MWMechanics::getActiveWeapon(actorClass.getCreatureStats(actor), actorClass.getInventoryStore(actor), &weaptype);
if (weaptype == WeapType_HandToHand)
{
static float fHandToHandReach =
world->getStore().get<ESM::GameSetting>().find("fHandToHandReach")->getFloat();
weapRange = fHandToHandReach;
}
else if (weaptype != WeapType_PickProbe && weaptype != WeapType_Spell && weaptype != WeapType_None)
{
// All other WeapTypes are actually weapons, so get<ESM::Weapon> is safe.
weapon = weaponSlot->get<ESM::Weapon>()->mBase;
weapRange = weapon->mData.mReach;
}
weapRange *= 100.0f;
}
else //is creature
{
weaptype = actorClass.getCreatureStats(actor).getDrawState() == DrawState_Spell ? WeapType_Spell : WeapType_HandToHand;
weapRange = 150.0f; //TODO: use true attack range (the same problem in Creature::hit)
}
bool distantCombat = false;
if (weaptype != WeapType_Spell)
{
// TODO: move to ActionWeapon
if (weaptype == WeapType_BowAndArrow || weaptype == WeapType_Crossbow || weaptype == WeapType_Thrown)
{
rangeAttack = 1000;
rangeFollow = 0; // not needed in ranged combat
distantCombat = true;
}
else
{
rangeAttack = weapRange;
rangeFollow = 300;
}
}
else
{
distantCombat = (rangeAttack > 500);
}
bool& readyToAttack = storage.mReadyToAttack;
// start new attack
storage.startAttackIfReady(actor, characterController, weapon, distantCombat);
/*
* Some notes on meanings of variables:
*
* rangeAttack:
*
* - Distance where attack using the actor's weapon is possible:
* longer for ranged weapons (obviously?) vs. melee weapons
* - Determined by weapon's reach parameter; hardcoded value
* for ranged weapon and for creatures
* - Once within this distance mFollowTarget is triggered
*
* rangeFollow:
*
* - Applies to melee weapons or hand to hand only (or creatures without
* weapons)
* - Distance a little further away than the actor's weapon reach
* i.e. rangeFollow > rangeAttack for melee weapons
* - Hardcoded value (0 for ranged weapons)
* - Once the target gets beyond this distance mFollowTarget is cleared
* and a path to the target needs to be found
*
* mFollowTarget:
*
* - Once triggered, the actor follows the target with LOS shortcut
* (the shortcut really only applies to cells where pathgrids are
* available, since the default path without pathgrids is direct to
* target even if LOS is not achieved)
*/
ESM::Position pos = actor.getRefData().getPosition();
osg::Vec3f vActorPos(pos.asVec3());
osg::Vec3f vTargetPos(target.getRefData().getPosition().asVec3());
osg::Vec3f vAimDir = MWBase::Environment::get().getWorld()->aimToTarget(actor, target);
float distToTarget = MWBase::Environment::get().getWorld()->getHitDistance(actor, target);
osg::Vec3f& lastActorPos = storage.mLastActorPos;
bool& followTarget = storage.mFollowTarget;
bool isStuck = false;
float speed = 0.0f;
if(movement.mPosition[1] && (lastActorPos - vActorPos).length() < (speed = actorClass.getSpeed(actor)) * REACTION_INTERVAL / 2)
isStuck = true;
lastActorPos = vActorPos;
// check if actor can move along z-axis
bool canMoveByZ = (actorClass.canSwim(actor) && world->isSwimming(actor))
|| world->isFlying(actor);
// can't fight if attacker can't go where target is. E.g. A fish can't attack person on land.
if (distToTarget >= rangeAttack
&& !actorClass.isNpc() && !MWMechanics::isEnvironmentCompatible(actor, target))
{
// TODO: start fleeing?
storage.stopAttack();
return false;
}
// for distant combat we should know if target is in LOS even if distToTarget < rangeAttack
bool inLOS = distantCombat ? world->getLOS(actor, target) : true;
// (within attack dist) || (not quite attack dist while following)
if(inLOS && (distToTarget < rangeAttack || (distToTarget <= rangeFollow && followTarget && !isStuck)))
{
mPathFinder.clearPath();
//Melee and Close-up combat
// getXAngleToDir determines vertical angle to target:
// if actor can move along z-axis it will control movement dir
// if can't - it will control correct aiming.
// note: in getZAngleToDir if we preserve dir.z then horizontal angle can be inaccurate
if (distantCombat)
{
osg::Vec3f& lastTargetPos = storage.mLastTargetPos;
vAimDir = AimDirToMovingTarget(actor, target, lastTargetPos, REACTION_INTERVAL, weaptype,
storage.mStrength);
lastTargetPos = vTargetPos;
movement.mRotation[0] = getXAngleToDir(vAimDir);
movement.mRotation[2] = getZAngleToDir(vAimDir);
}
else
{
movement.mRotation[0] = getXAngleToDir(vAimDir);
movement.mRotation[2] = getZAngleToDir((vTargetPos-vActorPos)); // using vAimDir results in spastic movements since the head is animated
}
// (not quite attack dist while following)
if (followTarget && distToTarget > rangeAttack)
{
//Close-up combat: just run up on target
storage.stopCombatMove();
movement.mPosition[1] = 1;
}
else // (within attack dist)
{
storage.startCombatMove(actorClass.isNpc(), distantCombat, distToTarget, rangeAttack);
readyToAttack = true;
//only once got in melee combat, actor is allowed to use close-up shortcutting
followTarget = true;
}
}
else // remote pathfinding
{
bool preferShortcut = false;
if (!distantCombat) inLOS = world->getLOS(actor, target);
// check if shortcut is available
bool& forceNoShortcut = storage.mForceNoShortcut;
ESM::Position& shortcutFailPos = storage.mShortcutFailPos;
if(inLOS && (!isStuck || readyToAttack)
&& (!forceNoShortcut || (shortcutFailPos.asVec3() - vActorPos).length() >= PATHFIND_SHORTCUT_RETRY_DIST))
{
if(speed == 0.0f) speed = actorClass.getSpeed(actor);
// maximum dist before pit/obstacle for actor to avoid them depending on his speed
float maxAvoidDist = REACTION_INTERVAL * speed + speed / MAX_VEL_ANGULAR_RADIANS * 2; // *2 - for reliability
preferShortcut = checkWayIsClear(vActorPos, vTargetPos, osg::Vec3f(vAimDir.x(), vAimDir.y(), 0).length() > maxAvoidDist*1.5? maxAvoidDist : maxAvoidDist/2);
}
// don't use pathgrid when actor can move in 3 dimensions
if (canMoveByZ)
{
preferShortcut = true;
movement.mRotation[0] = getXAngleToDir(vAimDir);
}
if(preferShortcut)
{
movement.mRotation[2] = getZAngleToDir((vTargetPos-vActorPos));
forceNoShortcut = false;
shortcutFailPos.pos[0] = shortcutFailPos.pos[1] = shortcutFailPos.pos[2] = 0;
mPathFinder.clearPath();
}
else // if shortcut failed stick to path grid
{
if(!isStuck && shortcutFailPos.pos[0] == 0.0f && shortcutFailPos.pos[1] == 0.0f && shortcutFailPos.pos[2] == 0.0f)
{
forceNoShortcut = true;
shortcutFailPos = pos;
}
followTarget = false;
buildNewPath(actor, target);
// should always return a path (even if it's just go straight on target.)
assert(mPathFinder.isPathConstructed());
}
if (readyToAttack)
{
// to stop possible sideway moving after target moved out of attack range
storage.stopCombatMove();
readyToAttack = false;
}
movement.mPosition[1] = 1;
}
return false;
}