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<H1><A ID="SECTION00400000000000000000">
Running Rayshade</A>
</H1>
<P>
<#74#><#1745#><EM>Rayshade</EM><#1745#><#74#>
can take anywhere from seconds to weeks to render an image. The exact
time required is a function of the speed of the
machine(s) on which
you're working, the complexity of the scene, and how ``good'' you want
the final image to be. <A NAME="tex2html2" HREF="footnode_mn.html#foot75" TARGET="footer"><SUP>2.1</SUP></A>
<P>
Creating a finished ray-traced image is an iterative process. Usually, many
test renderings are made at low resolution and with
non-essential features turned off. After each test image is created,
surface definitions might be modified, the eye or look positions may be
slightly changed, or the intensity of a light source changed.
<P>
This chapter describes the basic operation of <#76#><#1747#><EM>rayshade</EM><#1747#><#76#> and some of
the options that control that operation.
Setting these options properly can greatly reduce
rendering time, improve the quality of your images, and make you a better
person.
<P>
<#77#><#1749#><EM>Rayshade</EM><#1749#><#77#> usually works as a filter, reading a description from
the standard input and writing
an image file to the standard output. As it is working, <#78#><#1751#><EM>rayshade</EM><#1751#><#78#> reports
on the progress of the rendering by writing messages to the standard
error.
<P>