nsform contains translation and rotation. It is used to represent
 the position and orientation of rigid frames.
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	<!-- ========= CONSTRUCTOR DETAIL ======== -->
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		<h2><a name="constructor_detail"></a>Constructor</h2>
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			<div class="member">
				<div class="header">
					<a name="new()"></a>
	<span class="name">new</span>(?pos : <a href="../../../box2D/common/math/B2Vec2.html" class="type">B2Vec2</a>, ?r : <a href="../../../box2D/common/math/B2M