From c8f8b33bd90db834a346ae4a737ee8ad325ff3ca Mon Sep 17 00:00:00 2001
From: GoaLitiuM <goalitium@kapsi.fi>
Date: Sun, 9 May 2021 15:18:04 +0300
Subject: [PATCH] Implement AddForceAtPosition for Rigidbodies

---
 Source/Engine/Physics/Actors/RigidBody.cpp |  8 ++++++++
 Source/Engine/Physics/Actors/RigidBody.h   | 24 ++++++++++++++++++++--
 2 files changed, 30 insertions(+), 2 deletions(-)

diff --git a/Source/Engine/Physics/Actors/RigidBody.cpp b/Source/Engine/Physics/Actors/RigidBody.cpp
index eecce480a..1f213f8f3 100644
--- a/Source/Engine/Physics/Actors/RigidBody.cpp
+++ b/Source/Engine/Physics/Actors/RigidBody.cpp
@@ -316,6 +316,14 @@ void RigidBody::AddForce(const Vector3& force, ForceMode mode) const
     }
 }
 
+void RigidBody::AddForceAtPosition(const Vector3& force, const Vector3& position, ForceMode mode) const
+{
+    if (_actor && GetEnableSimulation())
+    {
+        PxRigidBodyExt::addForceAtPos(*_actor, C2P(force), C2P(position), static_cast<PxForceMode::Enum>(mode));
+    }
+}
+
 void RigidBody::AddRelativeForce(const Vector3& force, ForceMode mode) const
 {
     AddForce(Vector3::Transform(force, _transform.Orientation), mode);
diff --git a/Source/Engine/Physics/Actors/RigidBody.h b/Source/Engine/Physics/Actors/RigidBody.h
index 19e22e506..bfd6348df 100644
--- a/Source/Engine/Physics/Actors/RigidBody.h
+++ b/Source/Engine/Physics/Actors/RigidBody.h
@@ -428,7 +428,7 @@ public:
     /// Applies a force (or impulse) defined in the world space to the rigidbody at its center of mass.
     /// </summary>
     /// <remarks>
-    /// This will not induce a torque
+    /// This will not induce any torque
     /// <para>
     /// ForceMode determines if the force is to be conventional or impulsive.
     /// </para>
@@ -443,11 +443,31 @@ public:
     /// <param name="mode">The mode to use when applying the force/impulse.</param>
     API_FUNCTION() void AddForce(const Vector3& force, ForceMode mode = ForceMode::Force) const;
 
+    /// <summary>
+    /// Applies a force (or impulse) defined in the world space to the rigidbody at given position in the world space.
+    /// </summary>
+    /// <remarks>
+    /// Also applies appropriate amount of torque
+    /// <para>
+    /// ForceMode determines if the force is to be conventional or impulsive.
+    /// </para>
+    /// <para>
+    /// Each actor has an acceleration and a velocity change accumulator which are directly modified using the modes ForceMode::Acceleration
+    /// and ForceMode::VelocityChange respectively. The modes ForceMode::Force and ForceMode::Impulse also modify these same
+    /// accumulators and are just short hand for multiplying the vector parameter by inverse mass and then using ForceMode::Acceleration and
+    /// ForceMode::VelocityChange respectively.
+    /// </para>
+    /// </remarks>
+    /// <param name="force">The force/impulse to apply defined in the world space.</param>
+    /// <param name="position">The position of the force/impulse in the world space.</param>
+    /// <param name="mode">The mode to use when applying the force/impulse.</param>
+    API_FUNCTION() void AddForceAtPosition(const Vector3& force, const Vector3& position, ForceMode mode = ForceMode::Force) const;
+
     /// <summary>
     /// Applies a force (or impulse) defined in the local space of the rigidbody (relative to its coordinate system) at its center of mass.
     /// </summary>
     /// <remarks>
-    /// This will not induce a torque
+    /// This will not induce any torque
     /// <para>
     /// ForceMode determines if the force is to be conventional or impulsive.
     /// </para>