Rendering Algorithms Rollout (mental ray Renderer)
The controls in this rollout let you choose whether to render using ray-tracing, scanline rendering, or both. You can also choose the method used to accelerate ray-tracing.
Global Tuning Parameters Rollout (mental ray Renderer)
The Global Tuning Parameters parameters give you high-level control of the quality of mental ray shaders for soft shadows, glossy reflections, and glossy refractions. These controls let you adjust overall rendering quality without having to modify individual light and material settings. In general, lowering a global tuning parameter value decreases rendering time, and raising it increases rendering time.