This is a default built in render in Maya and is a general purpose render with the speed of scan line technology. Although the results of this render are pretty good, the down side is that it does not natively compute global illumination and radiosity. These are lighting techniques which results in natural and photorealistic renders. In order to render using these techniques, an assisting GI computation program is required. Therefore Maya has Mental Ray integrated for all GI and advanced raytracing related work.