and transformed by projection-matrix,
and the resulted homogeneous representation is returned.
</DD>
</DL>
<BR>
<BR>

<A NAME="36406"></A>
<B>:view</B> <EM>vec </EM>[method]

<DL COMPACT>
<DT> 
<DD> 
applies viewing transformation and projection transformation to <EM>vec</EM>
successively.
The resulted homogeneous representation is returned.
</DD>
</DL>
<BR>
<BR>

<A NAME="36417"></A>
<B>:screen</B> <EM>xsize (&amp;optional (ysize xsize)) </EM>[method]

<DL COMPACT>
<DT> 
<DD> 
changes the size of the viewi