ntained within the <b>RiBegin()</b> and <b>RiEnd()</b> calls.&nbsp; Thus, each time a new context is created, an <b>RiBegin()</b> function call is sent to the Interactive RenderMan renderer.&nbsp; Each time a context is destroyed, an <b>RiEnd()</b> function call is sent.</font>

<p><font face="Times">An application has only one N3DContextManager object and only one main context.&nbsp; The main context is the context by which the application usually interacts with the Interactive RenderMan renderer.&nbsp; An