From d5613321bf4d7ae5c44b97538f8ea9f0769084af Mon Sep 17 00:00:00 2001
From: mischa <info@noobtuts.com>
Date: Wed, 3 Apr 2024 19:18:55 +0800
Subject: [PATCH] fix impulse dir

---
 .../Components/ForecastRigidbody/ForecastRigidbody.cs       | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Assets/Mirror/Components/ForecastRigidbody/ForecastRigidbody.cs b/Assets/Mirror/Components/ForecastRigidbody/ForecastRigidbody.cs
index 3dc8a590d..03c94d2d1 100644
--- a/Assets/Mirror/Components/ForecastRigidbody/ForecastRigidbody.cs
+++ b/Assets/Mirror/Components/ForecastRigidbody/ForecastRigidbody.cs
@@ -321,7 +321,11 @@ void OnCollisionEnter(Collision collision)
             // the other object is in FOLLOWING mode (kinematic).
             // PhysX will register the collision, but not add the collision force while kinematic.
             // we need to add the force manually, which will also begin predicting it.
-            other.AddPredictedForce(-collision.impulse, ForceMode.Impulse);
+            // => collision.impulse is sometimes from A->B and sometimes B->A.
+            // => we need to calculate the direction manually to always be A->B.
+            Vector3 direction = other.transform.position - transform.position;
+            Vector3 impulse = direction.normalized * collision.impulse.magnitude;
+            other.AddPredictedForce(impulse, ForceMode.Impulse);
         }
 
         // optional user callbacks, in case people need to know about events.