

<A NAME="35944"></A>
<B>homo-viewport-clip</B> <EM>v1 v2 </EM>[function]

<DL COMPACT>
<DT> 
<DD> 
<EM>V1</EM> and <EM>v2</EM>, which are two homogeneous vectors with four elements,
represent a line in 3-D space.
The line is clipped at the boundary of <!-- MATH
 $x=-1, x=1, y=-1, y=1, z=0, z=1$
 -->
<SPAN CLASS="MATH"><IMG
 WIDTH="291" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
 SRC="manual-img83.png"
 ALT="$x=-1, x=1, y=-1, y=1, z=0, z=1$"></SPAN>,
and a list of two vectors are returned.
If the line lies comp