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<BIG CLASS="XLARGE"><B>projection </B></BIG> [class]  <PRE><TT>
  :super   <B>viewing</B> 
<BR>  :slots 		 (screenx screeny hither yon projection-matrix) 
</TT></PRE>
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<DL COMPACT>
<DT> 
<DD>defines projection transformation with a 4x4 matrix.
</DD>
</DL>
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<B>:projection</B> <EM>&amp;optional pmat </EM>[method]

<DL COMPACT>
<DT> 
<DD> 
if <EM>pmat</EM> is given, it is set to the <EM>projection-matrix</EM> slot.
<B>:projection</B> retu