]> git.localhorst.tv Git - blobs.git/commitdiff
random walks
authorDaniel Karbach <daniel.karbach@localhorst.tv>
Wed, 6 Dec 2017 22:57:39 +0000 (23:57 +0100)
committerDaniel Karbach <daniel.karbach@localhorst.tv>
Wed, 6 Dec 2017 23:10:05 +0000 (00:10 +0100)
src/blobs.cpp
src/creature/Creature.hpp
src/creature/Goal.hpp
src/creature/IdleGoal.hpp
src/creature/Situation.hpp
src/creature/StrollGoal.hpp [new file with mode: 0644]
src/creature/creature.cpp
src/creature/goal.cpp
src/ui/CreaturePanel.hpp
src/ui/ui.cpp
src/world/world.cpp

index 1d854fc403df7ae6f20258f1ef096fd9616f8b78..f5cc98842b0c13280761b8004c176277a847625a 100644 (file)
@@ -32,7 +32,7 @@ struct SwitchPanel {
                        for (auto a : planet.Creatures()) {
                                if (a != &c) {
                                        state.GetCreaturePanel().Show(*a);
-                                       a->OnDeath([&](creature::Creature &b) { (*this)(b); });
+                                       a->WhenDead([&](creature::Creature &b) { (*this)(b); });
                                        break;
                                }
                        }
@@ -102,7 +102,7 @@ int main(int argc, char *argv[]) {
 
        app::Application app(init.window, init.viewport);
        SwitchPanel swp(planet, app, state);
-       blob->OnDeath([&](creature::Creature &c) { swp(c); });
+       blob->WhenDead([&](creature::Creature &c) { swp(c); });
        app.PushState(&state);
        app.Run();
 
index 28e41311c287191cd8c218e795c773926e43cb79..0012d784a5d913132f3c030e73e66d996978673e 100644 (file)
@@ -144,7 +144,7 @@ public:
        void Hurt(double d) noexcept;
        void Die() noexcept;
        bool Dead() const noexcept;
-       void OnDeath(Callback cb) noexcept { on_death = cb; }
+       void WhenDead(Callback cb) noexcept { on_death = cb; }
        void Remove() noexcept;
        bool Removable() const noexcept { return removable; }
        void Removed() noexcept;
index 9ffeb0f006878f08e96f044436a8ab6987204130..4d3a17f431382d616a8f4828f7e1f9f3ee64529b 100644 (file)
@@ -9,6 +9,9 @@ namespace blobs {
 namespace app {
        struct Assets;
 }
+namespace math {
+       class GaloisLFSR;
+}
 namespace creature {
 
 class Creature;
@@ -33,6 +36,7 @@ public:
        const Steering &GetSteering() const noexcept;
        app::Assets &Assets() noexcept;
        const app::Assets &Assets() const noexcept;
+       math::GaloisLFSR &Random() noexcept;
 
        double Urgency() const noexcept { return urgency; }
        void Urgency(double u) noexcept { urgency = u; }
@@ -41,9 +45,15 @@ public:
        void Interruptible(bool i) noexcept { interruptible = i; }
 
        bool Complete() const noexcept { return complete; }
-       void SetComplete() noexcept;
+       void SetComplete();
+       void SetForeground();
+       void SetBackground();
        /// only supports one callback for now, new one will replace an old
-       void OnComplete(Callback) noexcept;
+       void WhenComplete(Callback) noexcept;
+       void WhenForeground(Callback) noexcept;
+       /// on background will not be called when the goal is first inserted
+       /// but only after is has been in the foreground once
+       void WhenBackground(Callback) noexcept;
 
 public:
        virtual std::string Describe() const = 0;
@@ -51,9 +61,16 @@ public:
        virtual void Tick(double dt) { }
        virtual void Action() { }
 
+private:
+       virtual void OnComplete() { }
+       virtual void OnForeground() { }
+       virtual void OnBackground() { }
+
 private:
        Creature &c;
        Callback on_complete;
+       Callback on_foreground;
+       Callback on_background;
        double urgency;
        bool interruptible;
        bool complete;
index eb402baeb67715f82a5f7709e1ef412ef2814312..e7c98d4045236f8fcce96c615ec388ad14f6ff96 100644 (file)
@@ -16,10 +16,10 @@ public:
 
 public:
        std::string Describe() const override;
-       void Enable() override;
-       void Tick(double dt) override;
        void Action() override;
 
+       void PickActivity();
+
 };
 
 }
index 25d218ddc2635d08bd26917df55623aa7082c23f..561f106c78b848ce3f4ca6c79a7b44c81c747e99 100644 (file)
@@ -65,6 +65,7 @@ public:
        void Move(const glm::dvec3 &dp) noexcept;
        void Accelerate(const glm::dvec3 &dv) noexcept;
        void EnforceConstraints(State &) noexcept;
+       void CheckWrap() noexcept;
 
        void Heading(const glm::dvec3 &h) noexcept { state.dir = h; }
        const glm::dvec3 &Heading() const noexcept { return state.dir; }
diff --git a/src/creature/StrollGoal.hpp b/src/creature/StrollGoal.hpp
new file mode 100644 (file)
index 0000000..969e4da
--- /dev/null
@@ -0,0 +1,36 @@
+#ifndef BLOBS_CREATURE_STROLLGOAL_HPP_
+#define BLOBS_CREATURE_STROLLGOAL_HPP_
+
+#include "Goal.hpp"
+
+#include "../math/glm.hpp"
+
+
+namespace blobs {
+namespace creature {
+
+class StrollGoal
+: public Goal {
+
+public:
+       explicit StrollGoal(Creature &);
+       ~StrollGoal() override;
+
+public:
+       std::string Describe() const override;
+       void Enable() override;
+       void Action() override;
+       void OnBackground() override;
+
+       void PickTarget() noexcept;
+
+private:
+       glm::dvec3 last;
+       glm::dvec3 next;
+
+};
+
+}
+}
+
+#endif
index a9c4dc73c613312e18da52b3a2ead77ddc827643..468967887ee96a1d62b7547c2d7a2ad8cff04461 100644 (file)
@@ -193,7 +193,7 @@ void Creature::Ingest(int res, double amount) noexcept {
 }
 
 void Creature::DoWork(double amount) noexcept {
-       stats.Exhaustion().Add(amount / Stamina());
+       stats.Exhaustion().Add(amount / (Stamina() + 1.0));
        // burn resources proportional to composition
        // factor = 1/total * 1/efficiency * amount * -1
        double factor = -amount / (composition.TotalMass() * EnergyEfficiency());
@@ -204,6 +204,8 @@ void Creature::DoWork(double amount) noexcept {
                double value = cmp.value * factor * sim.Resources()[cmp.resource].inverse_energy;
                AddMass(cmp.resource, value);
        }
+       // doing work improves strength a little
+       properties.Strength() += amount * 0.0001;
 }
 
 void Creature::Hurt(double amount) noexcept {
@@ -360,6 +362,9 @@ double Creature::AdaptChance() const noexcept {
 
 void Creature::AddGoal(std::unique_ptr<Goal> &&g) {
        g->Enable();
+       if (goals.empty()) {
+               g->SetForeground();
+       }
        goals.emplace_back(std::move(g));
 }
 
@@ -470,10 +475,16 @@ void Creature::TickBrain(double dt) {
        for (auto &goal : goals) {
                goal->Tick(dt);
        }
+       Goal *top = &*goals.front();
        // if active goal can be interrupted, check priorities
        if (goals.size() > 1 && goals[0]->Interruptible()) {
                std::sort(goals.begin(), goals.end(), GoalCompare);
        }
+       if (&*goals.front() != top) {
+               top->SetBackground();
+               goals.front()->SetForeground();
+               top = &*goals.front();
+       }
        goals[0]->Action();
        for (auto goal = goals.begin(); goal != goals.end();) {
                if ((*goal)->Complete()) {
@@ -482,6 +493,9 @@ void Creature::TickBrain(double dt) {
                        ++goal;
                }
        }
+       if (&*goals.front() != top) {
+               goals.front()->SetForeground();
+       }
 }
 
 math::AABB Creature::CollisionBox() const noexcept {
@@ -499,8 +513,9 @@ glm::dmat4 Creature::CollisionTransform() const noexcept {
        }
        orient[0] = normalize(cross(orient[1], orient[2]));
        orient[2] = normalize(cross(orient[0], orient[1]));
-       return glm::translate(glm::dvec3(pos.x, pos.y, pos.z + half_size))
-               * glm::dmat4(orient);
+       return glm::translate(glm::dvec3(pos.x, pos.y, pos.z))
+               * glm::dmat4(orient)
+               * glm::translate(glm::dvec3(0.0, half_size, 0.0));
 }
 
 glm::dmat4 Creature::LocalTransform() noexcept {
index 4124876851ba160e433442c0c756b33027f1a6cb..021e32d2b1c6ca36c3681859576005038c5600ad 100644 (file)
@@ -3,6 +3,7 @@
 #include "IdleGoal.hpp"
 #include "IngestGoal.hpp"
 #include "LocateResourceGoal.hpp"
+#include "StrollGoal.hpp"
 
 #include "Creature.hpp"
 #include "../app/Assets.hpp"
@@ -74,7 +75,7 @@ void BlobBackgroundTask::CheckStats() {
                                drink_subtask->Accept(cmp.resource, 1.0);
                        }
                }
-               drink_subtask->OnComplete([&](Goal &) { drink_subtask = nullptr; });
+               drink_subtask->WhenComplete([&](Goal &) { drink_subtask = nullptr; });
                GetCreature().AddGoal(std::unique_ptr<Goal>(drink_subtask));
        }
 
@@ -85,7 +86,7 @@ void BlobBackgroundTask::CheckStats() {
                                eat_subtask->Accept(cmp.resource, 1.0);
                        }
                }
-               eat_subtask->OnComplete([&](Goal &) { eat_subtask = nullptr; });
+               eat_subtask->WhenComplete([&](Goal &) { eat_subtask = nullptr; });
                GetCreature().AddGoal(std::unique_ptr<Goal>(eat_subtask));
        }
 
@@ -99,7 +100,7 @@ void BlobBackgroundTask::CheckStats() {
 
 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 +109,10 @@ 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 +120,113 @@ 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 {
+}
+
+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();
+}
+
+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() {
+       // use boredom as chance per minute
+       if (Random().UNorm() < GetCreature().GetStats().Boredom().value * (1.0 / 3600.0)) {
+               PickActivity();
+       }
+}
+
+void IdleGoal::PickActivity() {
+       GetCreature().AddGoal(std::unique_ptr<Goal>(new StrollGoal(GetCreature())));
+}
+
+
 namespace {
 
 std::string summarize(const Composition &comp, const app::Assets &assets) {
@@ -204,6 +312,7 @@ void IngestGoal::Action() {
                        GetSteering().Halt();
                } else {
                        // finally
+                       // TODO: somehow this still gets interrupted
                        Interruptible(false);
                        ingesting = true;
                }
@@ -213,7 +322,7 @@ void IngestGoal::Action() {
                        locate_subtask->Accept(c.resource, c.value);
                }
                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));
        }
 }
@@ -235,81 +344,6 @@ 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()
@@ -348,6 +382,7 @@ void LocateResourceGoal::Action() {
                } else {
                        double dist = glm::length2(GetSituation().Position() - target_pos);
                        if (dist < 0.0001) {
+                               searching = false;
                                LocateResource();
                        } else {
                                GetSteering().GoTo(target_pos);
@@ -437,7 +472,7 @@ void LocateResourceGoal::SearchVicinity() {
                }
        }
 
-       if (best_rating) {
+       if (best_rating > 0.0) {
                found = true;
                searching = false;
                target_pos = normalize(pos + (double(best_pos.x) * step_x) + (double(best_pos.y) * step_y)) * planet.Radius();
@@ -446,10 +481,10 @@ void LocateResourceGoal::SearchVicinity() {
                found = false;
                searching = true;
                target_pos = GetSituation().Position();
-               target_pos += Assets().random.SNorm() * step_x;
-               target_pos += Assets().random.SNorm() * step_y;
+               target_pos += Random().SNorm() * step_x;
+               target_pos += Random().SNorm() * step_y;
                // bias towards current heading
-               target_pos += GetSituation().Heading() * 0.5;
+               target_pos += GetSituation().Heading() * 1.5;
                target_pos = normalize(target_pos) * planet.Radius();
                GetSteering().GoTo(target_pos);
        }
@@ -460,5 +495,49 @@ bool LocateResourceGoal::NearTarget() const noexcept {
        return s.OnSurface() && length2(s.Position() - target_pos) < 0.5;
 }
 
+
+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 (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(dot(normal, rand_x)) > 0.999) {
+               rand_x = glm::dvec3(normal.z, normal.x, normal.y);
+       }
+       glm::dvec3 rand_y = cross(normal, rand_x);
+       next += ((rand_x * Random().SNorm()) + (rand_y * Random().SNorm())) * 1.5;
+       next = normalize(next) * GetSituation().GetPlanet().Radius();
+       GetSteering().GoTo(next);
+}
+
 }
 }
index 92e81becc403ab102e520263d738751387e614c3..719af405e8de00335e6caa67256408d1d4ae9a0c 100644 (file)
@@ -52,6 +52,9 @@ private:
        Label *age;
        Label *mass;
        Label *goal;
+       Label *pos;
+       Label *tile;
+       Label *head;
        Panel *composition;
        std::vector<Label *> components;
        Meter *stats[7];
index 11b63d87f6798d97d01be0d491d253e0a2ccaf63..f7dcc027c6805349f8de1ad3a684d2a5e56dd88e 100644 (file)
@@ -30,6 +30,9 @@ CreaturePanel::CreaturePanel(app::Assets &assets)
 , age(new Label(assets.fonts.medium))
 , mass(new Label(assets.fonts.medium))
 , goal(new Label(assets.fonts.medium))
+, pos(new Label(assets.fonts.medium))
+, tile(new Label(assets.fonts.medium))
+, head(new Label(assets.fonts.medium))
 , composition(new Panel)
 , stats{nullptr}
 , props{nullptr}
@@ -68,6 +71,32 @@ CreaturePanel::CreaturePanel(app::Assets &assets)
                ->Add(info_label_panel)
                ->Add(info_value_panel);
 
+       Label *pos_label = new Label(assets.fonts.medium);
+       pos_label->Text("Pos");
+       Label *tile_label = new Label(assets.fonts.medium);
+       tile_label->Text("Tile");
+       Label *head_label = new Label(assets.fonts.medium);
+       head_label->Text("Heading");
+
+       Panel *loc_label_panel = new Panel;
+       loc_label_panel
+               ->Direction(Panel::VERTICAL)
+               ->Add(pos_label)
+               ->Add(tile_label)
+               ->Add(head_label);
+       Panel *loc_value_panel = new Panel;
+       loc_value_panel
+               ->Direction(Panel::VERTICAL)
+               ->Add(pos)
+               ->Add(tile)
+               ->Add(head);
+       Panel *loc_panel = new Panel;
+       loc_panel
+               ->Direction(Panel::HORIZONTAL)
+               ->Spacing(10.0f)
+               ->Add(loc_label_panel)
+               ->Add(loc_value_panel);
+
        Label *stat_label[7];
        for (int i = 0; i < 7; ++i) {
                stat_label[i] = new Label(assets.fonts.medium);
@@ -144,6 +173,7 @@ CreaturePanel::CreaturePanel(app::Assets &assets)
        panel
                .Add(name)
                ->Add(info_panel)
+               ->Add(loc_panel)
                ->Add(composition)
                ->Add(stat_panel)
                ->Add(prop_panel)
@@ -194,6 +224,10 @@ void CreaturePanel::Draw(graphics::Viewport &viewport) noexcept {
                goal->Text(c->Goals()[0]->Describe());
        }
 
+       pos->Text(VectorString(c->GetSituation().Position(), 2));
+       tile->Text(c->GetSituation().GetTileType().label);
+       head->Text(VectorString(c->GetSituation().Heading(), 2));
+
        const creature::Composition &comp = c->GetComposition();
        if (comp.size() < components.size()) {
                composition->Clear();
index 49380ac8afdbee816cc6fc6658b2e2b6f78161f4..87c85ae7ad413514b6f6958425e12beefa08f3d7 100644 (file)
@@ -482,40 +482,40 @@ void Planet::BuildVAO(const Set<TileType> &ts) {
                                        glm::vec3 pos[5];
                                        pos[0][(surface + 0) % 3] = x + 0 - offset;
                                        pos[0][(surface + 1) % 3] = y + 0 - offset;
-                                       pos[0][(surface + 2) % 3] = surface < 3 ? offset : -offset;
+                                       pos[0][(surface + 2) % 3] = offset;
                                        pos[1][(surface + 0) % 3] = x + 0 - offset;
                                        pos[1][(surface + 1) % 3] = y + 1 - offset;
-                                       pos[1][(surface + 2) % 3] = surface < 3 ? offset : -offset;
+                                       pos[1][(surface + 2) % 3] = offset;
                                        pos[2][(surface + 0) % 3] = x + 1 - offset;
                                        pos[2][(surface + 1) % 3] = y + 0 - offset;
-                                       pos[2][(surface + 2) % 3] = surface < 3 ? offset : -offset;
+                                       pos[2][(surface + 2) % 3] = offset;
                                        pos[3][(surface + 0) % 3] = x + 1 - offset;
                                        pos[3][(surface + 1) % 3] = y + 1 - offset;
-                                       pos[3][(surface + 2) % 3] = surface < 3 ? offset : -offset;
+                                       pos[3][(surface + 2) % 3] = offset;
 
                                        float tex = ts[TileAt(surface, x, y).type].texture;
                                        const float tex_v_begin = surface < 3 ? 1.0f : 0.0f;
                                        const float tex_v_end = surface < 3 ? 0.0f : 1.0f;
 
-                                       attrib[4 * index + 0].position = normalize(pos[0]) * offset;
+                                       attrib[4 * index + 0].position = normalize(pos[0]) * (surface < 3 ? offset : -offset);
                                        attrib[4 * index + 0].normal = pos[0];
                                        attrib[4 * index + 0].tex_coord[0] = 0.0f;
                                        attrib[4 * index + 0].tex_coord[1] = tex_v_begin;
                                        attrib[4 * index + 0].tex_coord[2] = tex;
 
-                                       attrib[4 * index + 1].position = normalize(pos[1]) * offset;
+                                       attrib[4 * index + 1].position = normalize(pos[1]) * (surface < 3 ? offset : -offset);
                                        attrib[4 * index + 1].normal = pos[1];
                                        attrib[4 * index + 1].tex_coord[0] = 0.0f;
                                        attrib[4 * index + 1].tex_coord[1] = tex_v_end;
                                        attrib[4 * index + 1].tex_coord[2] = tex;
 
-                                       attrib[4 * index + 2].position = normalize(pos[2]) * offset;
+                                       attrib[4 * index + 2].position = normalize(pos[2]) * (surface < 3 ? offset : -offset);
                                        attrib[4 * index + 2].normal = pos[2];
                                        attrib[4 * index + 2].tex_coord[0] = 1.0f;
                                        attrib[4 * index + 2].tex_coord[1] = tex_v_begin;
                                        attrib[4 * index + 2].tex_coord[2] = tex;
 
-                                       attrib[4 * index + 3].position = normalize(pos[3]) * offset;
+                                       attrib[4 * index + 3].position = normalize(pos[3]) * (surface < 3 ? offset : -offset);
                                        attrib[4 * index + 3].normal = pos[3];
                                        attrib[4 * index + 3].tex_coord[0] = 1.0f;
                                        attrib[4 * index + 3].tex_coord[1] = tex_v_end;