The Render Manager > mental ray (Global Renderer)
The Render Manager > (expand a pass) > mental ray
Set a current pass and choose Render > Render > Renderer Options from the Render toolbar.
Options: Aliasing (Raytracing & Scanline Only) [Properties Reference]
The Rasterizer accelerates motion blur rendering for complex scenes containing a lot of moving objects. The Rasterizer produces high-quality blurs in a fraction of the time that it would take to render raytraced motion blur. It works by subdividing object surfaces into increasingly smaller triangles. Once the surface is subdivided, the triangles are drawn on screen, according to the number of samples that you specify.
The rasterizer should be used for scenes that do not require raytraced effects. Keep in mind, however, that each shading sample has the ability to trace reflected and refracted rays. Once a ray is shot, much of the time and memory savings you get from using the rasterizer could be quickly consumed by BSP tree calculations and object loading.
For this reason, you should avoid features that trigger rays to be traced (as described in the table below):
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