http://blogs.msdn.com/shawnhar/archive/2008/10/10/instances-and-indices-and-vfetch-oh-my.aspxI'm cross posting this discussion from an internal Microsoft mailing list, because I'm so awesomely cool that I just can't bear the thought of everything I ever wrote not being indexed and archived for posterity :-) &#160; My reply to a question aboutenCommunityServer 2.1 SP1 (Build: 61025.2)http://blogs.msdn.com/shawnhar/archive/2008/10/10/instances-and-indices-and-vfetch-oh-my.aspx#9001448Thu, 16 Oct 2008 07:55:59 GMT91d46819-8472-40ad-a661-2c78acb4018c:9001448StatusUnkown<p>I seem to remember NoOverwrite also isn't supported on the 360.. Perhaps I am wrong.</p> <p>How many frames buffer would be needed on the 360 (with / without vsync?). I'd imagine it would be less than the 2-5 on the PC.</p> <p>I'm currently in the process of implementing vfetch myself - and I am on the fence between #2 and a variation of your '2a' technique as well.</p> <p>And I'll just say that when your not using Effects, dealing with xbox shaders is a royal pain.</p> <p>:-)</p> http://blogs.msdn.com/shawnhar/archive/2008/10/10/instances-and-indices-and-vfetch-oh-my.aspx#9010592Wed, 22 Oct 2008 04:14:52 GMT91d46819-8472-40ad-a661-2c78acb4018c:9010592StatusUnkown<p>Some more feedback:</p> <p>I've found that using fmod(index,freq) is much more reliable than using index%freq.</p>