Flee if attacked even if attacker is not close.

CHANGELOG.md

@@ -68,6 +68,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Fixed npcs using `/say` instead of `/tell`
 - Camera jittering in third person has been significantly reduced
 - Many water shader issues have been fixed
+- Flee if attacked even if attacker is not close.
 
 ## [0.13.0] - 2022-07-23
 

common/src/comp/agent.rs

@@ -14,7 +14,7 @@ use std::{collections::VecDeque, fmt};
 use strum::{EnumIter, IntoEnumIterator};
 use vek::*;
 
-use super::dialogue::Subject;
+use super::{dialogue::Subject, Pos};
 
 pub const DEFAULT_INTERACTION_TIME: f32 = 3.0;
 pub const TRADE_INTERACTION_TIME: f32 = 300.0;
@@ -531,6 +531,10 @@ pub struct Agent {
     pub sounds_heard: Vec<Sound>,
     pub awareness: f32,
     pub position_pid_controller: Option<PidController<fn(Vec3<f32>, Vec3<f32>) -> f32, 16>>,
+    /// Position from which to flee. Intended to be the agent's position plus a
+    /// random position offset, to be used when a random flee direction is
+    /// required and reset each time the flee timer is reset.
+    pub flee_from_pos: Option<Pos>,
 }
 
 /// State persistence object for the behavior tree
@@ -563,6 +567,7 @@ impl Agent {
             sounds_heard: Vec::new(),
             awareness: 0.0,
             position_pid_controller: None,
+            flee_from_pos: None,
         }
     }
 

server/agent/src/consts.rs

@@ -6,7 +6,9 @@ pub const MAX_PATH_DIST: f32 = 170.0;
 pub const PARTIAL_PATH_DIST: f32 = 50.0;
 pub const SEPARATION_DIST: f32 = 10.0;
 pub const SEPARATION_BIAS: f32 = 0.8;
-pub const MAX_FLEE_DIST: f32 = 20.0;
+/// The distance within which agents will flee directly away if attacked from
+/// distance or if attacker detected.
+pub const NORMAL_FLEE_DIR_DIST: f32 = 20.0;
 pub const AVG_FOLLOW_DIST: f32 = 6.0;
 pub const RETARGETING_THRESHOLD_SECONDS: f64 = 10.0;
 pub const HEALING_ITEM_THRESHOLD: f32 = 0.5;

server/src/sys/agent/behavior_tree.rs

@@ -5,17 +5,18 @@ use common::{
             AgentEvent, Target, TimerAction, DEFAULT_INTERACTION_TIME, TRADE_INTERACTION_TIME,
         },
         Agent, Alignment, BehaviorCapability, BehaviorState, Body, BuffKind, ControlAction,
-        ControlEvent, Controller, InputKind, InventoryEvent, UtteranceKind,
+        ControlEvent, Controller, InputKind, InventoryEvent, Pos, UtteranceKind,
     },
     event::{Emitter, ServerEvent},
     path::TraversalConfig,
 };
-use rand::{prelude::ThreadRng, Rng};
+use rand::{prelude::ThreadRng, thread_rng, Rng};
+use server_agent::consts::NORMAL_FLEE_DIR_DIST;
 use specs::{
     saveload::{Marker, MarkerAllocator},
     Entity as EcsEntity,
 };
-use vek::Vec2;
+use vek::{Vec2, Vec3};
 
 use self::interaction::{
     handle_inbox_cancel_interactions, handle_inbox_finished_trade, handle_inbox_talk,
@@ -25,8 +26,8 @@ use self::interaction::{
 
 use super::{
     consts::{
-        DAMAGE_MEMORY_DURATION, FLEE_DURATION, HEALING_ITEM_THRESHOLD, MAX_FLEE_DIST,
-        MAX_FOLLOW_DIST, NPC_PICKUP_RANGE, RETARGETING_THRESHOLD_SECONDS,
+        DAMAGE_MEMORY_DURATION, FLEE_DURATION, HEALING_ITEM_THRESHOLD, MAX_FOLLOW_DIST,
+        NPC_PICKUP_RANGE, RETARGETING_THRESHOLD_SECONDS,
     },
     data::{AgentData, ReadData, TargetData},
     util::{get_entity_by_id, is_dead, is_dead_or_invulnerable, is_invulnerable, stop_pursuing},
@@ -560,10 +561,10 @@ fn do_combat(bdata: &mut BehaviorData) -> bool {
             let aggro_on = *aggro_on;
 
             if agent_data.below_flee_health(agent) {
-                let has_opportunity_to_flee = agent.action_state.timers
+                let flee_timer_done = agent.action_state.timers
                     [ActionStateBehaviorTreeTimers::TimerBehaviorTree as usize]
-                    < FLEE_DURATION;
-                let within_flee_distance = dist_sqrd < MAX_FLEE_DIST.powi(2);
+                    > FLEE_DURATION;
+                let within_normal_flee_dir_dist = dist_sqrd < NORMAL_FLEE_DIR_DIST.powi(2);
 
                 // FIXME: Using action state timer to see if allowed to speak is a hack.
                 if agent.action_state.timers
@@ -573,8 +574,21 @@ fn do_combat(bdata: &mut BehaviorData) -> bool {
                     agent_data.cry_out(agent, event_emitter, read_data);
                     agent.action_state.timers
                         [ActionStateBehaviorTreeTimers::TimerBehaviorTree as usize] = 0.01;
-                } else if within_flee_distance && has_opportunity_to_flee {
-                    agent_data.flee(agent, controller, tgt_pos, &read_data.terrain);
+                    agent.flee_from_pos = {
+                        let random = || thread_rng().gen_range(-1.0..1.0);
+                        Some(Pos(
+                            agent_data.pos.0 + Vec3::new(random(), random(), random())
+                        ))
+                    };
+                } else if !flee_timer_done {
+                    if within_normal_flee_dir_dist {
+                        agent_data.flee(agent, controller, tgt_pos, &read_data.terrain);
+                    } else if let Some(random_pos) = agent.flee_from_pos {
+                        agent_data.flee(agent, controller, &random_pos, &read_data.terrain);
+                    } else {
+                        agent_data.flee(agent, controller, tgt_pos, &read_data.terrain);
+                    }
+
                     agent.action_state.timers
                         [ActionStateBehaviorTreeTimers::TimerBehaviorTree as usize] +=
                         read_data.dt.0;
@@ -582,6 +596,7 @@ fn do_combat(bdata: &mut BehaviorData) -> bool {
                     agent.action_state.timers
                         [ActionStateBehaviorTreeTimers::TimerBehaviorTree as usize] = 0.0;
                     agent.target = None;
+                    agent.flee_from_pos = None;
                     agent_data.idle(agent, controller, read_data, rng);
                 }
             } else if is_dead(target, read_data) {