From dc8a40f7dcf9a6bfa7530c1d4532902d4425c4c1 Mon Sep 17 00:00:00 2001
From: erwincoumans <erwin.coumans@gmail.com>
Date: Sun, 17 Feb 2019 12:02:52 -0800
Subject: [PATCH] PyBullet: fix issue with setCollisionFilterGroupMask

---
 examples/SharedMemory/PhysicsServerCommandProcessor.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/examples/SharedMemory/PhysicsServerCommandProcessor.cpp b/examples/SharedMemory/PhysicsServerCommandProcessor.cpp
index 30bca5b4c..ab7a6aea9 100644
--- a/examples/SharedMemory/PhysicsServerCommandProcessor.cpp
+++ b/examples/SharedMemory/PhysicsServerCommandProcessor.cpp
@@ -5722,7 +5722,7 @@ bool PhysicsServerCommandProcessor::processCollisionFilterCommand(const struct S
 			btCollisionObject* colObj = 0;
 			if (body->m_multiBody)
 			{
-				if (clientCmd.m_collisionFilterArgs.m_linkIndexA)
+				if (clientCmd.m_collisionFilterArgs.m_linkIndexA==-1)
 				{
 					colObj = body->m_multiBody->getBaseCollider();
 				}