Procedural Primitives
Getting Started

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    Related topic: Adding an Interface


This tutorial is a brief introduction to the writing, compiling and use of procedural primitives with Maya. The C/C++ language code used by this tutorial implements a traditional RiProcedural interface - not the newer RiProcedural2 interface.

Before following the instructions given in this tutorial the reader should have carefully reviewed the tutorial "C++ Development Environment". It provides detailed information on installing MicroSoft's Visual Studio Community development environment and information about XCode for MacOSX.

The C++ Code

From Cutter's Template menu choose Procedural Prim->GenSpheresProc.cpp.

Figure 1

Save the file as StarterProc.cpp in the following location,

Compiling and Building the ProcPrim

Use the keyboard shortcut Alt+e, Control+e or Apple+e. A Process Monitor window will open. Ensure the DSO has been successfully compiled and built and has been saved in the location specified by Cutter's preference. On Windows the text displayed by the Process Monitor will be slightly different.

Figure 4 (OSX)

Using the ProcPrim with Maya

From the RenderMan menu choose Archive->Create Procedural Node.

Figure 5

Use the directory browse button to locate the DSO. On Windows the DSO will be named StarterProc.dll.

Figure 6

In the Data textfield enter the following text (make sure there is a space between the two numbers)
    0.2 50
Render a frame and you should be rewarded with 50 spheres of 0.2 units in radius.

Figure 7

Passing data to the procedural primitive ( or StarterProc.dll) by editing the Data textfield is very prone to error.

The next section, "Adding an Interface" demonstrates how custom attributes added to the RenderManProcedural can directly control the Data textfield.

© 2002- Malcolm Kesson. All rights reserved.