Find this section in some selected objects’ Attribute Editor, from the Attribute Spread Sheet ( Window > General Editors > Attribute Spread Sheet) or the Rendering Flags window ( Window > Rendering Editors > Rendering Flags).
The Render Stats section lets you turn on or off various rendering options for selected objects.
Turns on motion blur for the surface. You must also turn on Motion Blur in the Render Settings window.
When on, the surface overrides the global shading sample settings in the Render Settings window.
Sets the minimum number of times Maya samples each pixel. For example, if set to 1, Maya samples each pixel once; if set to 8, Maya samples each pixel 8 times. The number of shading samples taken per pixel is limited by the number of visibility samples performed by the Edge Anti-Aliasing computation. So, if you use Medium Quality (which performs 8 visibility samples per pixel), you cannot get more than 8 shading samples regardless of the Shading Samples attribute setting.
Since Shading Samples computation is very expensive, you should try adjusting the Max Shading Samples first. See Max Shading Samples.
Sets the maximum number of times a pixel is sampled during the second pass of a Highest Quality render (adaptive shading pass). The higher the number, the longer the rendering takes, but the more accurate the resulting image is.
Max Shading Samples has an effect only when used in conjunction with Highest Quality edge anti-aliasing. Also, depending on the requirements to compute an accurate solution, the number of Shading Samples taken can be less than the number of Max Shading Samples.