From c0ed7a57377eb2a0b18f792ff959e20df3c8f6fb Mon Sep 17 00:00:00 2001
From: hikerstk <hikerstk@178a84e3-b1eb-0310-8ba1-8eac791a3b58>
Date: Thu, 15 Jan 2009 23:53:47 +0000
Subject: [PATCH] Fixed balls starting to vibrate on the spot.

git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/trunk/supertuxkart@2935 178a84e3-b1eb-0310-8ba1-8eac791a3b58
---
 src/items/bowling.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/items/bowling.cpp b/src/items/bowling.cpp
index df3b49661..ad0a2f96f 100644
--- a/src/items/bowling.cpp
+++ b/src/items/bowling.cpp
@@ -50,7 +50,9 @@ Bowling::Bowling(Kart *kart) : Flyable(kart, POWERUP_BOWLING, 50.0f /* mass */)
                   new btSphereShape(0.5f*m_extend.getY()), 
                   -70.0f /*gravity*/, 
                   true /*rotates*/);
-
+    // Even if the ball is fired backwards, m_speed must be positive,
+    // otherwise the ball can start to vibrate when enery is added.
+    m_speed = fabsf(m_speed);
     // Do not adjust the z velociy depending on height above terrain, since
     // this would disable gravity.
     setAdjustZVelocity(false);