Impl Default for a few structs

src/data/coarena.rs

@@ -1,7 +1,7 @@
 use crate::data::arena::Index;
 
 #[cfg_attr(feature = "serde-serialize", derive(Serialize, Deserialize))]
-#[derive(Clone, Debug)]
+#[derive(Clone, Debug, Default)]
 /// A container for data associated to item existing into another Arena.
 pub struct Coarena<T> {
     data: Vec<(u32, T)>,

src/data/pubsub.rs

@@ -38,7 +38,7 @@ impl PubSubCursor {
 
 /// A pub-sub queue.
 #[cfg_attr(feature = "serde-serialize", derive(Serialize, Deserialize))]
-#[derive(Clone)]
+#[derive(Clone, Default)]
 pub struct PubSub<T> {
     deleted_messages: u32,
     deleted_offsets: u32,

src/dynamics/ccd/ccd_solver.rs

@@ -29,6 +29,12 @@ pub struct CCDSolver {
     query_pipeline: QueryPipeline,
 }
 
+impl Default for CCDSolver {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl CCDSolver {
     /// Initializes a new CCD solver
     pub fn new() -> Self {

src/dynamics/island_manager.rs

@@ -9,7 +9,7 @@ use crate::math::Real;
 /// Structure responsible for maintaining the set of active rigid-bodies, and
 /// putting non-moving rigid-bodies to sleep to save computation times.
 #[cfg_attr(feature = "serde-serialize", derive(Serialize, Deserialize))]
-#[derive(Clone)]
+#[derive(Clone, Default)]
 pub struct IslandManager {
     pub(crate) active_dynamic_set: Vec<RigidBodyHandle>,
     pub(crate) active_kinematic_set: Vec<RigidBodyHandle>,

src/dynamics/joint/joint_set.rs

@@ -37,7 +37,7 @@ pub(crate) type JointIndex = usize;
 pub(crate) type JointGraphEdge = crate::data::graph::Edge<Joint>;
 
 #[cfg_attr(feature = "serde-serialize", derive(Serialize, Deserialize))]
-#[derive(Clone)]
+#[derive(Clone, Default)]
 /// A set of joints that can be handled by a physics `World`.
 pub struct JointSet {
     rb_graph_ids: Coarena<RigidBodyGraphIndex>,

src/dynamics/rigid_body.rs

@@ -36,6 +36,12 @@ pub struct RigidBody {
     pub user_data: u128,
 }
 
+impl Default for RigidBody {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl RigidBody {
     fn new() -> Self {
         Self {

src/dynamics/rigid_body_set.rs

@@ -28,7 +28,7 @@ impl BodyPair {
 }
 
 #[cfg_attr(feature = "serde-serialize", derive(Serialize, Deserialize))]
-#[derive(Clone)]
+#[derive(Clone, Default)]
 /// A set of rigid bodies that can be handled by a physics pipeline.
 pub struct RigidBodySet {
     // NOTE: the pub(crate) are needed by the broad phase

src/dynamics/solver/island_solver.rs

@@ -19,6 +19,12 @@ pub struct IslandSolver {
     position_solver: PositionSolver,
 }
 
+impl Default for IslandSolver {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl IslandSolver {
     pub fn new() -> Self {
         Self {

src/dynamics/solver/parallel_island_solver.rs

@@ -133,6 +133,12 @@ pub struct ParallelIslandSolver {
     thread: ThreadContext,
 }
 
+impl Default for ParallelIslandSolver {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl ParallelIslandSolver {
     pub fn new() -> Self {
         Self {

src/geometry/broad_phase_multi_sap/broad_phase.rs

@@ -116,6 +116,12 @@ pub struct BroadPhase {
     reporting: HashMap<(u32, u32), bool>, // Workspace
 }
 
+impl Default for BroadPhase {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl BroadPhase {
     /// Create a new empty broad-phase.
     pub fn new() -> Self {

src/geometry/broad_phase_multi_sap/sap_proxy.rs

@@ -87,6 +87,12 @@ pub struct SAPProxies {
     pub first_free: SAPProxyIndex,
 }
 
+impl Default for SAPProxies {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl SAPProxies {
     pub fn new() -> Self {
         Self {

src/geometry/collider_set.rs

@@ -9,7 +9,7 @@ use crate::geometry::{ColliderChanges, ColliderHandle};
 use std::ops::{Index, IndexMut};
 
 #[cfg_attr(feature = "serde-serialize", derive(Serialize, Deserialize))]
-#[derive(Clone)]
+#[derive(Clone, Default)]
 /// A set of colliders that can be handled by a physics `World`.
 pub struct ColliderSet {
     pub(crate) colliders: Arena<Collider>,

src/geometry/interaction_graph.rs

@@ -14,6 +14,12 @@ pub struct InteractionGraph<N, E> {
     pub(crate) graph: Graph<N, E>,
 }
 
+impl<N: Copy, E> Default for InteractionGraph<N, E> {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl<N: Copy, E> InteractionGraph<N, E> {
     /// Creates a new empty collection of collision objects.
     pub fn new() -> Self {

src/geometry/narrow_phase.rs

@@ -62,6 +62,12 @@ pub struct NarrowPhase {
 
 pub(crate) type ContactManifoldIndex = usize;
 
+impl Default for NarrowPhase {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl NarrowPhase {
     /// Creates a new empty narrow-phase.
     pub fn new() -> Self {

src/pipeline/collision_pipeline.rs

@@ -33,6 +33,12 @@ fn check_pipeline_send_sync() {
     do_test::<CollisionPipeline>();
 }
 
+impl Default for CollisionPipeline {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl CollisionPipeline {
     /// Initializes a new physics pipeline.
     pub fn new() -> CollisionPipeline {