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Reference.org
AC3D
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<p>AC3D is a 3D design program which has been available since 1994. The software is used by designers for modeling 3D graphics for games and simulations - most notably it is used by the scenery creators at <a href="/facts/Laminar_Research/W9bcPa8v">Laminar Research</a> on the <a href="/facts/X-Plane_(simulator)/joHlYmTk">X-Plane (simulator)</a>. The .ac format has also been used in <a href="/facts/FlightGear/Du2xgegG">FlightGear</a> for scenery objects and aircraft models. </p>