From deea2bb411c54fd7f8116c848f28c32e31aef4af Mon Sep 17 00:00:00 2001
From: Jeongseok Lee <jslee02@gmail.com>
Date: Mon, 9 Jul 2018 20:59:29 -0700
Subject: [PATCH] Use const reference for referencing existing members

---
 src/BulletDynamics/Featherstone/btMultiBody.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/BulletDynamics/Featherstone/btMultiBody.cpp b/src/BulletDynamics/Featherstone/btMultiBody.cpp
index b9eabef64..8023f63c0 100644
--- a/src/BulletDynamics/Featherstone/btMultiBody.cpp
+++ b/src/BulletDynamics/Featherstone/btMultiBody.cpp
@@ -819,8 +819,8 @@ void btMultiBody::computeAccelerationsArticulatedBodyAlgorithmMultiDof(btScalar
     }
 	else 
 	{
-		const btVector3 baseForce = isConstraintPass? m_baseConstraintForce : m_baseForce;
-		const btVector3 baseTorque = isConstraintPass? m_baseConstraintTorque : m_baseTorque;
+		const btVector3& baseForce = isConstraintPass? m_baseConstraintForce : m_baseForce;
+		const btVector3& baseTorque = isConstraintPass? m_baseConstraintTorque : m_baseTorque;
 		//external forces		
 		zeroAccSpatFrc[0].setVector(-(rot_from_parent[0] * baseTorque), -(rot_from_parent[0] * baseForce));