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raysh402
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<H1><A ID="SECTION00540000000000000000">
Stereo Rendering</A>
</H1>
<P>
Producing a stereo pair is a relatively simple process; rather than
simply rendering a single image, one creates two related images which
may then be viewed on a stereo monitor, in a stereo slide viewer, or
by using colored glasses and an appropriate display filter.
<P>
<#256#><#1805#><EM>Rayshade</EM><#1805#><#256#> facilitates the rendering of stereo pairs by allowing you
to specify the distance between the camera positions used in
creating the two images. The camera position given in the
<#257#><#1807#><EM>rayshade</EM><#1807#><#257#> input file
defines
the midpoint between the two camera positions used to generate the
images.
Generally, the remainder of the viewing parameters are kept constant.
<P>
<DL>
<DT><STRONG><#4661#><#4661#></STRONG></DT>
<DD><#1227#><TT>eyesep</TT><#1227#> <#1228#><EM>separation</EM><#1228#>
<BR> Specifies the camera separation to be used in rendering stereo
pairs.
</DD>
</DL>There is no default value.
The separation may also be specified on the command line through
the <#262#><EM>-E</EM><#262#> option.
The view to be rendered (left or right)
must be specified on the command line by using
the <#263#><TT>-l</TT><#263#> or <#264#><TT>-r</TT><#264#> options.
<P>
There are several things to keep in mind when generating stereo
pairs. Firstly, those objects that lie in from of the focal plane will
appear to protrude from the screen when viewed in stereo, while objects
farther
than the focal plane will recede into the screen. As it is usually
easier to look at stereo images that recede into the screen, you will
usually
want to place the look point closer to the camera than the object
of primary interest.
<P>
The degree of stereo effect is a
function of the camera separation and the distance from the camera
to the look point. Too large a separation will result in a hyperstereo
effect that will be hard to resolve, while too little a value will result
in no stereo effect
at all. A separation equal to one tenth the distance from the
camera to the look point is often a good choice.