]> git.localhorst.tv Git - blobs.git/blobdiff - src/creature/goal.cpp
"look around" activity
[blobs.git] / src / creature / goal.cpp
index f20ecc5b2b3d2cd99c96ad2a6685286a1b27691c..74ed17f6e9b6c85fdfc95ce9312e45b8634c1919 100644 (file)
@@ -1,11 +1,15 @@
+#include "AttackGoal.hpp"
 #include "BlobBackgroundTask.hpp"
 #include "Goal.hpp"
 #include "IdleGoal.hpp"
 #include "IngestGoal.hpp"
 #include "LocateResourceGoal.hpp"
+#include "LookAroundGoal.hpp"
+#include "StrollGoal.hpp"
 
 #include "Creature.hpp"
 #include "../app/Assets.hpp"
+#include "../math/const.hpp"
 #include "../ui/string.hpp"
 #include "../world/Planet.hpp"
 #include "../world/Resource.hpp"
 #include <iostream>
 #include <sstream>
 #include <glm/gtx/io.hpp>
+#include <glm/gtx/rotate_vector.hpp>
 
 
 namespace blobs {
 namespace creature {
 
+AttackGoal::AttackGoal(Creature &self, Creature &target)
+: Goal(self)
+, target(target)
+, damage_target(0.25)
+, damage_dealt(0.0)
+, cooldown(0.0) {
+}
+
+AttackGoal::~AttackGoal() {
+}
+
+std::string AttackGoal::Describe() const {
+       return "attack " + target.Name();
+}
+
+void AttackGoal::Tick(double dt) {
+       cooldown -= dt;
+}
+
+void AttackGoal::Action() {
+       if (target.Dead() || !GetCreature().PerceptionTest(target.GetSituation().Position())) {
+               SetComplete();
+               return;
+       }
+       const glm::dvec3 diff(GetSituation().Position() - target.GetSituation().Position());
+       const double hit_range = GetCreature().Size() * 0.5 * GetCreature().DexertyFactor();
+       const double hit_dist = hit_range + (0.5 * GetCreature().Size()) + 0.5 * (target.Size());
+       if (GetStats().Damage().Critical()) {
+               // flee
+               GetSteering().Pass(diff * 5.0);
+               GetSteering().DontSeparate();
+               GetSteering().Haste(1.0);
+       } else if (glm::length2(diff) > hit_dist * hit_dist) {
+               // full throttle chase
+               GetSteering().Pass(target.GetSituation().Position());
+               GetSteering().DontSeparate();
+               GetSteering().Haste(1.0);
+       } else {
+               // attack
+               GetSteering().Halt();
+               GetSteering().DontSeparate();
+               GetSteering().Haste(1.0);
+               if (cooldown <= 0.0) {
+                       constexpr double impulse = 0.05;
+                       const double force = GetCreature().Strength();
+                       const double damage =
+                               force * impulse
+                               * (GetCreature().GetComposition().TotalDensity() / target.GetComposition().TotalDensity())
+                               * (GetCreature().Mass() / target.Mass())
+                               / target.Mass();
+                       GetCreature().DoWork(force * impulse * glm::length(diff));
+                       target.Hurt(damage);
+                       target.GetSituation().Accelerate(glm::normalize(diff) * force * -impulse);
+                       damage_dealt += damage;
+                       if (damage_dealt >= damage_target || target.Dead()) {
+                               SetComplete();
+                               if (target.Dead()) {
+                                       GetCreature().GetSimulation().Log() << GetCreature().Name()
+                                               << " killed " << target.Name() << std::endl;
+                               }
+                       }
+                       cooldown = 1.0 + (4.0 * (1.0 - GetCreature().DexertyFactor()));
+               }
+       }
+}
+
+void AttackGoal::OnBackground() {
+       // abort if something more important comes up
+       SetComplete();
+}
+
+
 BlobBackgroundTask::BlobBackgroundTask(Creature &c)
 : Goal(c)
 , breathing(false)
@@ -40,15 +117,15 @@ void BlobBackgroundTask::Tick(double dt) {
                // TODO: derive breathing ability
                int gas = Assets().data.resources["air"].id;
                // TODO: check if in compatible atmosphere
-               double amount = GetCreature().GetStats().Breath().gain * -(1.5 + 0.5 * GetCreature().ExhaustionFactor());
-               GetCreature().GetStats().Breath().Add(amount * dt);
+               double amount = GetStats().Breath().gain * -(1.0 + GetCreature().ExhaustionFactor());
+               GetStats().Breath().Add(amount * dt);
                // maintain ~1% gas composition
                double gas_amount = GetCreature().GetComposition().Get(gas);
                if (gas_amount < GetCreature().GetComposition().TotalMass() * 0.01) {
                        double add = std::min(GetCreature().GetComposition().TotalMass() * 0.025 - gas_amount, -amount * dt);
                        GetCreature().Ingest(gas, add);
                }
-               if (GetCreature().GetStats().Breath().Empty()) {
+               if (GetStats().Breath().Empty()) {
                        breathing = false;
                }
        }
@@ -61,7 +138,7 @@ void BlobBackgroundTask::Action() {
 }
 
 void BlobBackgroundTask::CheckStats() {
-       Creature::Stats &stats = GetCreature().GetStats();
+       Creature::Stats &stats = GetStats();
 
        if (!breathing && stats.Breath().Bad()) {
                breathing = true;
@@ -71,10 +148,16 @@ void BlobBackgroundTask::CheckStats() {
                drink_subtask = new IngestGoal(GetCreature(), stats.Thirst());
                for (const auto &cmp : GetCreature().GetComposition()) {
                        if (Assets().data.resources[cmp.resource].state == world::Resource::LIQUID) {
-                               drink_subtask->Accept(cmp.resource, 1.0);
+                               double value = cmp.value / GetCreature().GetComposition().TotalMass();
+                               drink_subtask->Accept(cmp.resource, value);
+                               for (const auto &compat : Assets().data.resources[cmp.resource].compatibility) {
+                                       if (Assets().data.resources[compat.first].state == world::Resource::LIQUID) {
+                                               drink_subtask->Accept(compat.first, value * compat.second);
+                                       }
+                               }
                        }
                }
-               drink_subtask->OnComplete([&](Goal &) { drink_subtask = nullptr; });
+               drink_subtask->WhenComplete([&](Goal &) { drink_subtask = nullptr; });
                GetCreature().AddGoal(std::unique_ptr<Goal>(drink_subtask));
        }
 
@@ -82,24 +165,23 @@ void BlobBackgroundTask::CheckStats() {
                eat_subtask = new IngestGoal(GetCreature(), stats.Hunger());
                for (const auto &cmp : GetCreature().GetComposition()) {
                        if (Assets().data.resources[cmp.resource].state == world::Resource::SOLID) {
-                               eat_subtask->Accept(cmp.resource, 1.0);
+                               double value = cmp.value / GetCreature().GetComposition().TotalMass();
+                               eat_subtask->Accept(cmp.resource, value);
+                               for (const auto &compat : Assets().data.resources[cmp.resource].compatibility) {
+                                       if (Assets().data.resources[compat.first].state == world::Resource::SOLID) {
+                                               eat_subtask->Accept(compat.first, value * compat.second);
+                                       }
+                               }
                        }
                }
-               eat_subtask->OnComplete([&](Goal &) { eat_subtask = nullptr; });
+               eat_subtask->WhenComplete([&](Goal &) { eat_subtask = nullptr; });
                GetCreature().AddGoal(std::unique_ptr<Goal>(eat_subtask));
        }
-
-       // when in bad shape, don't make much effort
-       if (stats.Damage().Bad() || stats.Exhaustion().Bad() || stats.Fatigue().Critical()) {
-               GetCreature().GetSteering().DontSeparate();
-       } else {
-               GetCreature().GetSteering().ResumeSeparate();
-       }
 }
 
 void BlobBackgroundTask::CheckSplit() {
        if (GetCreature().Mass() > GetCreature().OffspringMass() * 2.0
-               && GetCreature().OffspringChance() > Assets().random.UNorm()) {
+               && GetCreature().OffspringChance() > Random().UNorm()) {
                GetCreature().GetSimulation().Log() << GetCreature().Name() << " split" << std::endl;
                Split(GetCreature());
                return;
@@ -108,10 +190,10 @@ void BlobBackgroundTask::CheckSplit() {
 
 void BlobBackgroundTask::CheckMutate() {
        // check for random property mutation
-       if (GetCreature().MutateChance() > Assets().random.UNorm()) {
-               double amount = 1.0 + (Assets().random.SNorm() * 0.05);
-               math::Distribution &d = GetCreature().GetGenome().properties.props[Assets().random.UInt(9)];
-               if (Assets().random.UNorm() < 0.5) {
+       if (GetCreature().MutateChance() > Random().UNorm()) {
+               double amount = 1.0 + (Random().SNorm() * 0.05);
+               math::Distribution &d = GetCreature().GetGenome().properties.props[Random().UInt(9)];
+               if (Random().UNorm() < 0.5) {
                        d.Mean(d.Mean() * amount);
                } else {
                        d.StandardDeviation(d.StandardDeviation() * amount);
@@ -119,6 +201,109 @@ void BlobBackgroundTask::CheckMutate() {
        }
 }
 
+
+Goal::Goal(Creature &c)
+: c(c)
+, on_complete()
+, on_foreground()
+, on_background()
+, urgency(0.0)
+, interruptible(true)
+, complete(false) {
+}
+
+Goal::~Goal() noexcept {
+}
+
+app::Assets &Goal::Assets() noexcept {
+       return c.GetSimulation().Assets();
+}
+
+const app::Assets &Goal::Assets() const noexcept {
+       return c.GetSimulation().Assets();
+}
+
+math::GaloisLFSR &Goal::Random() noexcept {
+       return Assets().random;
+}
+
+void Goal::SetComplete() {
+       if (!complete) {
+               complete = true;
+               OnComplete();
+               if (on_complete) {
+                       on_complete(*this);
+               }
+       }
+}
+
+void Goal::SetForeground() {
+       OnForeground();
+       if (on_foreground) {
+               on_foreground(*this);
+       }
+}
+
+void Goal::SetBackground() {
+       OnBackground();
+       if (on_background) {
+               on_background(*this);
+       }
+}
+
+void Goal::WhenComplete(std::function<void(Goal &)> cb) noexcept {
+       on_complete = cb;
+       if (complete) {
+               on_complete(*this);
+       }
+}
+
+void Goal::WhenForeground(std::function<void(Goal &)> cb) noexcept {
+       on_foreground = cb;
+}
+
+void Goal::WhenBackground(std::function<void(Goal &)> cb) noexcept {
+       on_background = cb;
+}
+
+
+IdleGoal::IdleGoal(Creature &c)
+: Goal(c) {
+       Urgency(-1.0);
+       Interruptible(true);
+}
+
+IdleGoal::~IdleGoal() {
+}
+
+std::string IdleGoal::Describe() const {
+       return "idle";
+}
+
+void IdleGoal::Action() {
+       // when in bad shape, don't make much effort
+       if (GetStats().Damage().Bad() || GetStats().Exhaustion().Bad() || GetStats().Fatigue().Critical()) {
+               GetSteering().DontSeparate();
+       } else {
+               GetSteering().ResumeSeparate();
+       }
+
+       // use boredom as chance per 15s
+       if (Random().UNorm() < GetStats().Boredom().value * (1.0 / 900.0)) {
+               PickActivity();
+       }
+}
+
+void IdleGoal::PickActivity() {
+       int n = Random().UInt(2);
+       if (n == 0) {
+               GetCreature().AddGoal(std::unique_ptr<Goal>(new StrollGoal(GetCreature())));
+       } else {
+               GetCreature().AddGoal(std::unique_ptr<Goal>(new LookAroundGoal(GetCreature())));
+       }
+}
+
+
 namespace {
 
 std::string summarize(const Composition &comp, const app::Assets &assets) {
@@ -140,7 +325,7 @@ std::string summarize(const Composition &comp, const app::Assets &assets) {
 IngestGoal::IngestGoal(Creature &c, Creature::Stat &stat)
 : Goal(c)
 , stat(stat)
-, accept()
+, accept(Assets().data.resources)
 , locate_subtask(nullptr)
 , ingesting(false)
 , resource(-1)
@@ -178,9 +363,8 @@ void IngestGoal::Tick(double dt) {
        }
        if (ingesting) {
                if (OnSuitableTile() && !GetSituation().Moving()) {
-                       // TODO: determine satisfaction factor
                        GetCreature().Ingest(resource, yield * dt);
-                       stat.Add(-1.0 * yield * dt);
+                       stat.Add(-1.0 * yield * GetCreature().GetComposition().Compatibility(resource) * dt);
                        if (stat.Empty()) {
                                SetComplete();
                        }
@@ -204,6 +388,7 @@ void IngestGoal::Action() {
                        GetSteering().Halt();
                } else {
                        // finally
+                       // TODO: somehow this still gets interrupted
                        Interruptible(false);
                        ingesting = true;
                }
@@ -212,14 +397,15 @@ void IngestGoal::Action() {
                for (const auto &c : accept) {
                        locate_subtask->Accept(c.resource, c.value);
                }
+               locate_subtask->SetMinimum(stat.gain * -1.1);
                locate_subtask->Urgency(Urgency() + 0.1);
-               locate_subtask->OnComplete([&](Goal &){ locate_subtask = nullptr; });
+               locate_subtask->WhenComplete([&](Goal &){ locate_subtask = nullptr; });
                GetCreature().AddGoal(std::unique_ptr<Goal>(locate_subtask));
        }
 }
 
 bool IngestGoal::OnSuitableTile() {
-       if (!GetSituation().OnTile()) {
+       if (!GetSituation().OnGround()) {
                return false;
        }
        const world::TileType &t = GetSituation().GetTileType();
@@ -235,90 +421,14 @@ bool IngestGoal::OnSuitableTile() {
 }
 
 
-Goal::Goal(Creature &c)
-: c(c)
-, on_complete()
-, urgency(0.0)
-, interruptible(true)
-, complete(false) {
-}
-
-Goal::~Goal() noexcept {
-}
-
-Situation &Goal::GetSituation() noexcept {
-       return c.GetSituation();
-}
-
-const Situation &Goal::GetSituation() const noexcept {
-       return c.GetSituation();
-}
-
-Steering &Goal::GetSteering() noexcept {
-       return c.GetSteering();
-}
-
-const Steering &Goal::GetSteering() const noexcept {
-       return c.GetSteering();
-}
-
-app::Assets &Goal::Assets() noexcept {
-       return c.GetSimulation().Assets();
-}
-
-const app::Assets &Goal::Assets() const noexcept {
-       return c.GetSimulation().Assets();
-}
-
-void Goal::SetComplete() noexcept {
-       if (!complete) {
-               complete = true;
-               if (on_complete) {
-                       on_complete(*this);
-               }
-       }
-}
-
-void Goal::OnComplete(std::function<void(Goal &)> cb) noexcept {
-       on_complete = cb;
-       if (complete) {
-               on_complete(*this);
-       }
-}
-
-
-IdleGoal::IdleGoal(Creature &c)
-: Goal(c) {
-       Urgency(-1.0);
-       Interruptible(true);
-}
-
-IdleGoal::~IdleGoal() {
-}
-
-std::string IdleGoal::Describe() const {
-       return "idle";
-}
-
-void IdleGoal::Enable() {
-}
-
-void IdleGoal::Tick(double dt) {
-}
-
-void IdleGoal::Action() {
-}
-
-
 LocateResourceGoal::LocateResourceGoal(Creature &c)
 : Goal(c)
-, accept()
+, accept(Assets().data.resources)
 , found(false)
 , target_pos(0.0)
-, target_srf(0)
-, target_tile(0)
 , searching(false)
-, reevaluate(0.0) {
+, reevaluate(0.0)
+, minimum(0.0) {
 }
 
 LocateResourceGoal::~LocateResourceGoal() noexcept {
@@ -348,14 +458,14 @@ void LocateResourceGoal::Action() {
                if (!searching) {
                        LocateResource();
                } else {
-                       double dist = glm::length2(GetSituation().Position() - target_pos);
-                       if (dist < 0.0001) {
+                       if (OnTarget()) {
+                               searching = false;
                                LocateResource();
                        } else {
                                GetSteering().GoTo(target_pos);
                        }
                }
-       } else if (OnTargetTile()) {
+       } else if (OnTarget()) {
                GetSteering().Halt();
                if (!GetSituation().Moving()) {
                        SetComplete();
@@ -367,7 +477,7 @@ void LocateResourceGoal::Action() {
 }
 
 void LocateResourceGoal::LocateResource() {
-       if (GetSituation().OnTile()) {
+       if (GetSituation().OnSurface()) {
                const world::TileType &t = GetSituation().GetTileType();
                auto yield = t.FindBestResource(accept);
                if (yield != t.resources.cend()) {
@@ -376,92 +486,200 @@ void LocateResourceGoal::LocateResource() {
                        found = true;
                        searching = false;
                        target_pos = GetSituation().Position();
-                       target_srf = GetSituation().Surface();
-                       target_tile = GetSituation().GetPlanet().SurfacePosition(target_srf, target_pos);
                } else {
                        // go find somewhere else
                        SearchVicinity();
+                       if (!found) {
+                               Remember();
+                               if (!found) {
+                                       RandomWalk();
+                               }
+                       }
                }
        } else {
                // well, what now?
+               found = false;
+               searching = false;
        }
 }
 
 void LocateResourceGoal::SearchVicinity() {
        const world::Planet &planet = GetSituation().GetPlanet();
-       int srf = GetSituation().Surface();
        const glm::dvec3 &pos = GetSituation().Position();
+       const glm::dvec3 normal(planet.NormalAt(pos));
+       const glm::dvec3 step_x(glm::normalize(glm::cross(normal, glm::dvec3(normal.z, normal.x, normal.y))) * (GetCreature().PerceptionOmniRange() * 0.7));
+       const glm::dvec3 step_y(glm::normalize(glm::cross(step_x, normal)) * (GetCreature().PerceptionOmniRange() * 0.7));
 
-       glm::ivec2 loc = planet.SurfacePosition(srf, pos);
-       glm::ivec2 seek_radius(2);
-       glm::ivec2 begin(glm::max(glm::ivec2(0), loc - seek_radius));
-       glm::ivec2 end(glm::min(glm::ivec2(planet.SideLength()), loc + seek_radius + glm::ivec2(1)));
-
-       double rating[end.y - begin.y][end.x - begin.x];
-       std::memset(rating, 0, sizeof(double) * (end.y - begin.y) * (end.x - begin.x));
+       const int search_radius = int(GetCreature().PerceptionRange() / (GetCreature().PerceptionOmniRange() * 0.7));
+       double rating[2 * search_radius + 1][2 * search_radius + 1];
+       std::memset(rating, '\0', (2 * search_radius + 1) * (2 * search_radius + 1) * sizeof(double));
 
        // find close and rich field
-       for (int y = begin.y; y < end.y; ++y) {
-               for (int x = begin.x; x < end.x; ++x) {
-                       const world::TileType &type = planet.TypeAt(srf, x, y);
+       for (int y = -search_radius; y < search_radius + 1; ++y) {
+               for (int x = -search_radius; x < search_radius + 1; ++x) {
+                       const glm::dvec3 tpos(pos + (double(x) * step_x) + (double(y) * step_y));
+                       if (!GetCreature().PerceptionTest(tpos)) continue;
+                       const world::TileType &type = planet.TileTypeAt(tpos);
                        auto yield = type.FindBestResource(accept);
                        if (yield != type.resources.cend()) {
-                               // TODO: subtract minimum yield
-                               rating[y - begin.y][x - begin.x] = yield->ubiquity * accept.Get(yield->resource);
-                               double dist = std::max(0.125, 0.25 * glm::length(planet.TileCenter(srf, x, y) - pos));
-                               rating[y - begin.y][x - begin.x] /= dist;
+                               rating[y + search_radius][x + search_radius] = yield->ubiquity * accept.Get(yield->resource);
+                               // penalize distance
+                               double dist = std::max(0.125, 0.25 * glm::length2(tpos - pos));
+                               rating[y + search_radius][x + search_radius] /= dist;
                        }
                }
        }
 
-       // demote crowded tiles
+       // penalize crowding
        for (auto &c : planet.Creatures()) {
                if (&*c == &GetCreature()) continue;
-               if (c->GetSituation().Surface() != srf) continue;
-               glm::ivec2 coords(c->GetSituation().SurfacePosition());
-               if (coords.x < begin.x || coords.x >= end.x) continue;
-               if (coords.y < begin.y || coords.y >= end.y) continue;
-               rating[coords.y - begin.y][coords.x - begin.x] *= 0.9;
+               for (int y = -search_radius; y < search_radius + 1; ++y) {
+                       for (int x = -search_radius; x < search_radius + 1; ++x) {
+                               const glm::dvec3 tpos(pos + (double(x) * step_x) + (double(y) * step_y));
+                               if (glm::length2(tpos - c->GetSituation().Position()) < 1.0) {
+                                       rating[y + search_radius][x + search_radius] *= 0.8;
+                               }
+                       }
+               }
        }
 
        glm::ivec2 best_pos(0);
        double best_rating = -1.0;
 
-       for (int y = begin.y; y < end.y; ++y) {
-               for (int x = begin.x; x < end.x; ++x) {
-                       if (rating[y - begin.y][x - begin.x] > best_rating) {
+       for (int y = -search_radius; y < search_radius + 1; ++y) {
+               for (int x = -search_radius; x < search_radius + 1; ++x) {
+                       if (rating[y + search_radius][x + search_radius] > best_rating) {
                                best_pos = glm::ivec2(x, y);
-                               best_rating = rating[y - begin.y][x - begin.x];
+                               best_rating = rating[y + search_radius][x + search_radius];
                        }
                }
        }
 
-       if (best_rating) {
+       if (best_rating > minimum) {
                found = true;
                searching = false;
-               target_pos = planet.TileCenter(srf, best_pos.x, best_pos.y);
-               target_srf = srf;
-               target_tile = best_pos;
+               target_pos = glm::normalize(pos + (double(best_pos.x) * step_x) + (double(best_pos.y) * step_y)) * planet.Radius();
                GetSteering().GoTo(target_pos);
-       } else if (!searching) {
-               found = false;
-               searching = true;
-               target_pos = GetSituation().Position();
-               target_pos[(srf + 0) % 3] += Assets().random.SNorm();
-               target_pos[(srf + 1) % 3] += Assets().random.SNorm();
-               // bias towards current direction
-               target_pos += glm::normalize(GetSituation().Velocity()) * 0.5;
-               target_pos = clamp(target_pos, -planet.Radius(), planet.Radius());
+       }
+}
+
+void LocateResourceGoal::Remember() {
+       glm::dvec3 pos(0.0);
+       if (GetCreature().GetMemory().RememberLocation(accept, pos)) {
+               found = true;
+               searching = false;
+               target_pos = pos;
                GetSteering().GoTo(target_pos);
        }
 }
 
-bool LocateResourceGoal::OnTargetTile() const noexcept {
+void LocateResourceGoal::RandomWalk() {
+       if (searching) {
+               return;
+       }
+
+       const world::Planet &planet = GetSituation().GetPlanet();
+       const glm::dvec3 &pos = GetSituation().Position();
+       const glm::dvec3 normal(planet.NormalAt(pos));
+       const glm::dvec3 step_x(glm::normalize(glm::cross(normal, glm::dvec3(normal.z, normal.x, normal.y))));
+       const glm::dvec3 step_y(glm::normalize(glm::cross(step_x, normal)));
+
+       found = false;
+       searching = true;
+       target_pos = GetSituation().Position();
+       target_pos += Random().SNorm() * 3.0 * step_x;
+       target_pos += Random().SNorm() * 3.0 * step_y;
+       // bias towards current heading
+       target_pos += GetSituation().Heading() * 1.5;
+       target_pos = glm::normalize(target_pos) * planet.Radius();
+       GetSteering().GoTo(target_pos);
+}
+
+bool LocateResourceGoal::OnTarget() const noexcept {
        const Situation &s = GetSituation();
-       return s.OnSurface()
-               && s.Surface() == target_srf
-               && s.OnTile()
-               && s.SurfacePosition() == target_tile;
+       return s.OnGround() && glm::length2(s.Position() - target_pos) < 0.0001;
+}
+
+
+LookAroundGoal::LookAroundGoal(Creature &c)
+: Goal(c)
+, timer(0.0) {
+}
+
+LookAroundGoal::~LookAroundGoal() {
+}
+
+std::string LookAroundGoal::Describe() const {
+       return "look around";
+}
+
+void LookAroundGoal::Enable() {
+       GetSteering().Halt();
+}
+
+void LookAroundGoal::Tick(double dt) {
+       timer -= dt;
+}
+
+void LookAroundGoal::Action() {
+       if (timer < 0.0) {
+               PickDirection();
+               timer = 1.0 + (Random().UNorm() * 4.0);
+       }
+}
+
+void LookAroundGoal::OnBackground() {
+       SetComplete();
+}
+
+void LookAroundGoal::PickDirection() noexcept {
+       double r = Random().SNorm();
+       r *= std::abs(r) * 0.5 * PI;
+       GetCreature().HeadingTarget(glm::rotate(GetSituation().Heading(), r, GetSituation().SurfaceNormal()));
+}
+
+
+StrollGoal::StrollGoal(Creature &c)
+: Goal(c)
+, last(GetSituation().Position())
+, next(last) {
+}
+
+StrollGoal::~StrollGoal() {
+}
+
+std::string StrollGoal::Describe() const {
+       return "take a walk";
+}
+
+void StrollGoal::Enable() {
+       last = GetSituation().Position();
+       GetSteering().Haste(0.0);
+       PickTarget();
+}
+
+void StrollGoal::Action() {
+       if (glm::length2(next - GetSituation().Position()) < 0.0001) {
+               PickTarget();
+       }
+}
+
+void StrollGoal::OnBackground() {
+       SetComplete();
+}
+
+void StrollGoal::PickTarget() noexcept {
+       last = next;
+       next += GetSituation().Heading() * 1.5;
+       const glm::dvec3 normal(GetSituation().GetPlanet().NormalAt(GetSituation().Position()));
+       glm::dvec3 rand_x(GetSituation().Heading());
+       if (std::abs(glm::dot(normal, rand_x)) > 0.999) {
+               rand_x = glm::dvec3(normal.z, normal.x, normal.y);
+       }
+       glm::dvec3 rand_y = glm::cross(normal, rand_x);
+       next += ((rand_x * Random().SNorm()) + (rand_y * Random().SNorm())) * 1.5;
+       next = glm::normalize(next) * GetSituation().GetPlanet().Radius();
+       GetSteering().GoTo(next);
 }
 
 }