Vehicle & destructible bullet hitboxes

src/assets/model.cpp

@@ -21,6 +21,10 @@ static collision::Material GetMaterialByName(const std::string& name)
         return collision::PM_GLASS;
     else if (name == "flesh")
         return collision::PM_FLESH;
+    else if (name == "car") // TODO: make new material for cars
+        return collision::PM_METAL;
+    else if (name == "carwindow")
+        return collision::PM_NONE;
     else
         return collision::PM_STONE;
 }
@@ -35,7 +39,7 @@ std::shared_ptr<const assets::Model> assets::Model::LoadFromFile(const std::stri
     std::unique_ptr<btConvexHullShape> temp_hull;
     std::unique_ptr<btCompoundShape> compound;
 
-    bool current_collision = true;
+    collision::Material col_material = collision::PM_NONE;
 
     LoadCMDFile(filename, [&](const std::string& command, std::istringstream& iss) {
         if (command == "v")
@@ -91,7 +95,7 @@ std::shared_ptr<const assets::Model> assets::Model::LoadFromFile(const std::stri
                 mb.AddTriangle(t);
             )
 
-            if (current_collision && model->cmesh_)
+            if (model->cmesh_)
             {
                 glm::vec3 p[3];
                 for (size_t i = 0; i < 3; ++i)
@@ -225,19 +229,18 @@ std::shared_ptr<const assets::Model> assets::Model::LoadFromFile(const std::stri
         {
             std::string pm_name;
             iss >> pm_name;
-            if (pm_name == "none")
+
+            if (model->cmesh_)
             {
-                current_collision = false;
+                model->cmesh_->BeginMaterial(GetMaterialByName(pm_name));
-            }
-            else
-            {
-                current_collision = true;
-                if (model->cmesh_)
-                {
-                    model->cmesh_->BeginMaterial(GetMaterialByName(pm_name));
-                }
             }
         }
+        else if (command == "cpm")
+        {
+            std::string pm_name;
+            iss >> pm_name;
+            col_material = GetMaterialByName(pm_name);
+        }
         else
         {
             throw std::runtime_error("Unknown command in model file: " + command);
@@ -268,6 +271,13 @@ std::shared_ptr<const assets::Model> assets::Model::LoadFromFile(const std::stri
         model->cshape_ = std::move(compound);
     }
 
+    if (model->cshape_)
+    {
+        collision::SetShapeMaterial(*model->cshape_, col_material);
+        if (col_material != collision::PM_NONE)
+            model->cshape_is_bullet_target_ = true;
+    }
+
     return model;
 }
 

src/assets/model.hpp

@@ -45,6 +45,7 @@ public:
     const glm::vec3& GetColOffset() const { return col_offset_; }
     const collision::TriangleMesh* GetColMesh() const { return cmesh_.get(); }
     btCollisionShape* GetColShape() const { return cshape_.get(); }
+    bool IsColShapeBulletTarget() const { return cshape_is_bullet_target_; }
 
     const std::shared_ptr<const Skeleton>& GetSkeleton() const { return skeleton_; }
     CLIENT_ONLY(const std::shared_ptr<const Mesh>& GetMesh() const { return mesh_; })
@@ -60,6 +61,7 @@ private:
     // std::vector<ModelCollisionShape> cshapes_;
     std::vector<std::unique_ptr<btCollisionShape>> subshapes_;
     std::unique_ptr<btCollisionShape> cshape_;
+    bool cshape_is_bullet_target_ = false;
 
     std::shared_ptr<const Skeleton> skeleton_;
     CLIENT_ONLY(std::shared_ptr<const Mesh> mesh_;);

src/collision/shape_info.hpp

@@ -9,6 +9,7 @@ namespace collision
 
 enum Material : uint8_t
 {
+    PM_NONE,
     PM_STONE,
     PM_DIRT,
     PM_GRASS,

src/collision/trianglemesh.cpp

@@ -11,6 +11,9 @@ void collision::TriangleMesh::BeginMaterial(Material material)
 
 void collision::TriangleMesh::AddTriangle(const glm::vec3& v0, const glm::vec3& v1, const glm::vec3& v2)
 {
+	if (current_material_ == PM_NONE)
+		return;
+
 	btVector3 bt_v0(v0.x, v0.y, v0.z);
 	btVector3 bt_v1(v1.x, v1.y, v1.z);
 	btVector3 bt_v2(v2.x, v2.y, v2.z);

src/collision/trianglemesh.hpp

@@ -26,7 +26,7 @@ public:
     btBvhTriangleMeshShape* GetShape() const { return bt_shape_.get(); }
 
 private:
-    Material current_material_ = PM_STONE;
+    Material current_material_ = PM_NONE;
     btTriangleMesh bt_mesh_;
     std::unique_ptr<btBvhTriangleMeshShape> bt_shape_;
     std::vector<Material> tri_materials_;

src/game/mapinstance.cpp

@@ -76,11 +76,19 @@ game::MapObjectCollision::MapObjectCollision(collision::DynamicsWorld& world,
         model_->GetParamFloat("destr_th", destr_th_);
     }
 
+    col_group_ = collision::OG_DEFAULT;
+    col_mask_ = collision::OG_ALL; 
+
     // prefer simple cshape which allow destruction
     if (cshape)
     {
         body_ = std::make_unique<btRigidBody>(
             btRigidBody::btRigidBodyConstructionInfo(mass, nullptr, cshape, local_inertia));
+
+        if (!model_->IsColShapeBulletTarget())
+        {
+            col_mask_ &= ~collision::OG_PROJECTILE;
+        }
     }
     else if (cmesh)
     {
@@ -96,7 +104,7 @@ game::MapObjectCollision::MapObjectCollision(collision::DynamicsWorld& world,
     collision::SetObjectInfo(body_.get(), collision::OT_MAP_OBJECT, oflags, this);
 
     // world_.GetBtWorld().addRigidBody(body_.get(), btBroadphaseProxy::StaticFilter, btBroadphaseProxy::AllFilter);
-    world_.GetBtWorld().addRigidBody(body_.get());
+    world_.GetBtWorld().addRigidBody(body_.get(), col_group_, col_mask_);
 }
 
 void game::MapObjectCollision::Break()
@@ -122,7 +130,7 @@ void game::MapObjectCollision::Break()
     
     collision::SetObjectInfo(body_.get(), collision::OT_UNDEFINED, 0, this);
 
-    world_.GetBtWorld().addRigidBody(body_.get());
+    world_.GetBtWorld().addRigidBody(body_.get(), col_group_, col_mask_);
 }
 
 void game::MapObjectCollision::GetModelTransform(Transform& trans) const

src/game/mapinstance.hpp

@@ -31,6 +31,8 @@ public:
     net::ObjNum GetNum() const { return num_; }
     float GetDestroyThreshold() const { return destr_th_; }
 
+    int col_group_ = 0, col_mask_ = 0;
+
     virtual ~MapObjectCollision() override;
 
 private:

src/game/vehicle.cpp

@@ -38,6 +38,11 @@ void game::Vehicle::Update()
 {
     Super::Update();
 
+    if (physics_)
+    {
+        physics_->Update();
+    }
+
     root_.UpdateMatrix();
 
     flags_ = 0;
@@ -99,7 +104,7 @@ void game::Vehicle::OnBulletHit(const game::BulletInfo& bullet, const btCollisio
     if (!physics_)
         return;
 
-    auto impulse = glm::normalize(bullet.end - bullet.start) * 10000.0f;
+    auto impulse = glm::normalize(bullet.end - bullet.start) * 100.0f;
     physics_->GetBtBody().activate();
     physics_->GetBtBody().applyCentralImpulse(btVector3(impulse.x, impulse.y, impulse.z));
 }
@@ -728,6 +733,25 @@ game::VehiclePhysics::VehiclePhysics(collision::DynamicsWorld& world, Transform&
     bt_world.addRigidBody(body_.get(), collision::OG_DEFAULT, ~collision::OG_PROJECTILE);
     bt_world.addAction(vehicle_.get());
 
+
+    // make bullet hitbox
+    auto col_mesh = model.GetModel()->GetColMesh();
+    if (col_mesh)
+    {
+        bullet_hitbox_ = std::make_unique<btCollisionObject>();
+        bullet_hitbox_->setCollisionShape(col_mesh->GetShape());
+        collision::SetObjectInfo(bullet_hitbox_.get(), collision::OT_ENTITY, 0, &obj_cb);
+    
+        bt_world.addCollisionObject(bullet_hitbox_.get(), collision::OG_DEFAULT, collision::OG_PROJECTILE);
+
+        UpdateBulletHitboxTransform();
+    }
+
+}
+
+void game::VehiclePhysics::Update()
+{
+    UpdateBulletHitboxTransform();
 }
 
 game::VehiclePhysics::~VehiclePhysics()
@@ -735,4 +759,17 @@ game::VehiclePhysics::~VehiclePhysics()
     auto& bt_world = world_.GetBtWorld();
     bt_world.removeRigidBody(body_.get());
     bt_world.removeAction(vehicle_.get());
+
+    if (bullet_hitbox_)
+    {
+        bt_world.removeCollisionObject(bullet_hitbox_.get());
+    }
+}
+
+void game::VehiclePhysics::UpdateBulletHitboxTransform()
+{
+    if (!bullet_hitbox_)
+        return;
+
+    bullet_hitbox_->setWorldTransform(body_->getWorldTransform());
 }

src/game/vehicle.hpp

@@ -41,16 +41,22 @@ public:
 
     DELETE_COPY_MOVE(VehiclePhysics)
 
+    void Update();
+
     btRigidBody& GetBtBody() { return *body_; }
     collision::RaycastVehicle& GetBtVehicle() { return *vehicle_; }
 
     ~VehiclePhysics();
 
+private:
+    void UpdateBulletHitboxTransform();
+
 private:
     collision::DynamicsWorld& world_;
     collision::MotionState motion_;
     std::unique_ptr<btRigidBody> body_;
     std::unique_ptr<collision::RaycastVehicle> vehicle_;
+    std::unique_ptr<btCollisionObject> bullet_hitbox_;
 };
 
 class Vehicle : public Entity