http://blogs.msdn.com/b/chuckw/archive/2010/01/29/a-little-love-for-xnamath.aspxOver the past year or so, one of my projects has been the XNAMath library which shipped for the first time to Windows developers in the DirectX SDK (March 2008). XNAMath began life back in 2004 as "xboxmath" for the Xbox 360, and was originally developeden-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.msdn.com/b/chuckw/archive/2010/01/29/a-little-love-for-xnamath.aspx#10234141Fri, 04 Nov 2011 18:50:02 GMT91d46819-8472-40ad-a661-2c78acb4018c:10234141Chuck Walbourn - MSFT<p>It&#39;s called &quot;Collision&quot;. Install the DirectX SDK (March 2009 or later) release. Run Sample Browswer. Set the Show area to &quot;System&quot;.</p> <div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=10234141" width="1" height="1">http://blogs.msdn.com/b/chuckw/archive/2010/01/29/a-little-love-for-xnamath.aspx#10233615Thu, 03 Nov 2011 14:41:03 GMT91d46819-8472-40ad-a661-2c78acb4018c:10233615Joseph<p>To which Collision DirectX SDK sample do refer to?</p> <div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=10233615" width="1" height="1">