1 files changed, 34 insertions, 0 deletions
diff --git a/src/dynamics/joint/ball_joint.rs b/src/dynamics/joint/ball_joint.rs
new file mode 100644
index 0000000..ec255d4
--- /dev/null
+++ b/src/dynamics/joint/ball_joint.rs
@@ -0,0 +1,34 @@
+use crate::math::{Point, Vector};
+
+#[derive(Copy, Clone)]
+#[cfg_attr(feature = "serde-serialize", derive(Serialize, Deserialize))]
+/// A joint that removes all relative linear motion between a pair of points on two bodies.
+pub struct BallJoint {
+    /// Where the ball joint is attached on the first body, expressed in the first body local frame.
+    pub local_anchor1: Point<f32>,
+    /// Where the ball joint is attached on the first body, expressed in the first body local frame.
+    pub local_anchor2: Point<f32>,
+    /// The impulse applied by this joint on the first body.
+    ///
+    /// The impulse applied to the second body is given by `-impulse`.
+    pub impulse: Vector<f32>,
+}
+
+impl BallJoint {
+    /// Creates a new Ball joint from two anchors given on the local spaces of the respective bodies.
+    pub fn new(local_anchor1: Point<f32>, local_anchor2: Point<f32>) -> Self {
+        Self::with_impulse(local_anchor1, local_anchor2, Vector::zeros())
+    }
+
+    pub(crate) fn with_impulse(
+        local_anchor1: Point<f32>,
+        local_anchor2: Point<f32>,
+        impulse: Vector<f32>,
+    ) -> Self {
+        Self {
+            local_anchor1,
+            local_anchor2,
+            impulse,
+        }
+    }
+}