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TiAm - here's an example of how to cycle through instances for reduced collision checks: http://www.amirai.net/forums/filtered_collisions.zip
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Any chance this is still around somewhere? I'd like to have a look <img src="{SMILIES_PATH}/icon_e_biggrin.gif" alt=":D" title="Very Happy">
Have you tried clicking the link? It works when I click it. If it didn't work when you clicked it, perhaps my web server was down at the time.