Issue link: https://digital.copcomm.com/i/6960
February 2010 42 Maxwell Render C reating realistic images has always been one of the main goals of 3D computer graphics. Special effects artists, archi- tects, and many others are in the business of simulating real- ity using 3D tools. However, no matter how realistic the models and textures in a 3D scene, the scene must be rendered. Like pho- tography, rendering is an art that uses light to create an image. In 3D, however, light is calculated, and calculations can only simu- late reality. Getting these calculations more correct is what makes one render look more "real" than another. Next Limit's Maxwell Render is next in line for the throne of most realistic renderer. Maxwell Render is presumably named after James Clerk Maxwell, the famous physicist who discovered many of the equations for how light and electromagnetic waves propagate. It's certainly an appropriate name for a renderer promising to be physically correct and capable of simulating light exactly as it behaves in the real world. e software is from Next Limit, which also makes the highly regarded RealFlow fluids and dynamics system—another piece of software that does a great job at simulating reality. Maxwell Render can be used in two different ways. e first is to use Maxwell Studio, which is a master application that gives you the ability to author materials, set up cameras, and render scenes imported from other applications. is app has a nice interface that is reminiscent of the venerable Flint and Flame compositing applications from Autodesk in that the color scheme is rather dark and the interface elements not flashy, just functional. Most of the work is done in one or more 3D viewports. Lights, cameras, and objects can be added or imported from a number of 3D formats. For RealFlow users, simulations can be im- ported, as well. While Maxwell Studio is nice, I suspect most people will probably select the second option and use it as a plug-in to a more traditional 3D application. Maxwell Render plugs into a large number of applications, from 3D software such as 3ds Max and Maya (Autodesk) and Light- Wave (NewTek), to CAD applications such as SolidWorks (Dassault), Rhino (McNeel North America), and Sketchup (Google). I tested it in Maya, Max, and Sketchup, and found slightly different results. Maya and Max are certainly more robust applications, so many (but not all) of the standard materials and lights translate to Maxwell. Rendering can be started from the standard render options within each package. Sketchup doesn't really have a render button, so rendering is started by exporting a Maxwell file, which automatically starts up a render window. Maxwell Render comes with a good library of materials, and there's a lot more that can be downloaded from the Web site. You can also author your own materials within your 3D application or Maxwell Studio. Maxwell Render's materials are physically correct and work in a layered para- digm. A car paint material might have three or four dif- ferent layers, for example—one for the base coat, one for the metal flakes, another for the topcoat, and yet another for the clear coat. Each layer can have wildly different pa- rameters for very interesting effects. Individual layers can have the usual transparency and color channels, but also advanced features such as subsurface scattering. When applying materials within Maxwell Studio, you can add them on a per-object basis or by polygon selec- tion. One thing I found was that the poly selection tools were not very robust, which made selecting discrete parts of the model more difficult. is shortcoming is one more reason to use Maxwell Render as a plug- in, so you can use the superior texture application tools found in 3D packages such as Maya. e way Maxwell handles lights is interesting. When I opened Maxwell Studio, one of the first things I looked for was a way to add lights to the scene. ere are no traditional spots or point lights within Maxwell Studio; the brightness of the materials is what creates light in the scene. For those who are using Maxwell as a plug-in to another application, however, the standard lights will translate, but internally Maxwell Render is seeing them as illuminated geometry. is lighting model opens up some new possibilities. If you want a fluorescent tube light, for ex- ample, you could model a tube and then add an illuminated Rendering By GeorGe Maestri February 2010 Maxwell render $995 Next Limit www.nextlimit.com The Maxwell Studio interface is clean and well organized, but many users will opt for one of the many plug-ins offered that allow rendering directly from standard CAD and 3D apps.