fix 3d concave shape to use multiple of 3 faces (#156)

src/joints/rapier_revolute_joint.rs

@@ -1,5 +1,4 @@
 use godot::classes::*;
-use godot::prelude::*;
 #[cfg(feature = "dim2")]
 use physics_server_2d::JointType;
 #[cfg(feature = "dim3")]

src/rapier_wrapper/shape.rs

@@ -120,6 +120,7 @@ impl PhysicsEngine {
         self.insert_shape(shape)
     }
 
+    #[cfg(feature = "dim2")]
     pub fn shape_create_concave_polyline(
         &mut self,
         points: &Vec<Vector<Real>>,
@@ -130,6 +131,17 @@ impl PhysicsEngine {
         self.insert_shape(shape)
     }
 
+    #[cfg(feature = "dim3")]
+    pub fn shape_create_concave_polyline(
+        &mut self,
+        points: &Vec<Vector<Real>>,
+        indices: Option<Vec<[u32; 3]>>,
+    ) -> ShapeHandle {
+        let points_vec = point_array_to_vec(points);
+        let shape = SharedShape::trimesh(points_vec, indices.unwrap());
+        self.insert_shape(shape)
+    }
+
     pub fn shape_get_aabb(&self, handle: ShapeHandle) -> rapier::prelude::Aabb {
         if let Some(shape) = self.get_shape(handle) {
             return shape.compute_local_aabb();

src/servers/rapier_physics_server_impl.rs

@@ -1389,7 +1389,7 @@ impl RapierPhysicsServerImpl {
         from: Transform,
         motion: Vector,
         margin: f32,
-        max_collisions: i32,
+        _max_collisions: i32,
         collide_separation_ray: bool,
         recovery_as_collision: bool,
         result: *mut PhysicsServerExtensionMotionResult,
@@ -1612,10 +1612,10 @@ impl RapierPhysicsServerImpl {
         rid: Rid,
         body_a: Rid,
         pivot_a: Vector3,
-        axis_a: Vector3,
+        _axis_a: Vector3,
         body_b: Rid,
         pivot_b: Vector3,
-        axis_b: Vector3,
+        _axis_b: Vector3,
     ) {
         let physics_data = physics_data();
         let mut joint: Box<dyn IRapierJoint>;

src/shapes/rapier_concave_polygon_shape.rs

@@ -49,10 +49,16 @@ impl IRapierShape for RapierConcavePolygonShape {
             rapier_points.push(vector_to_rapier(self.points[i]));
         }
         let mut segments = Vec::new();
+        #[cfg(feature = "dim2")]
         for i in (0..point_count).step_by(2) {
             let s = [(i) as u32, (i + 1) as u32];
             segments.push(s);
         }
+        #[cfg(feature = "dim3")]
+        for i in (0..point_count).step_by(3) {
+            let s = [(i) as u32, (i + 1) as u32, (i + 2) as u32];
+            segments.push(s);
+        }
         physics_engine.shape_create_concave_polyline(&rapier_points, Some(segments))
     }