Location:
• 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.
• Tab: Framebuffer [Properties Reference]
• Options: Sample Filtering
Filtering Settings complement the antialiasing procedure in post-processing — ensuring even more antialiasing. Each of the five Filter Type settings (Gauss, Box, Triangle, Mitchell, and Lanczos) process subsamples—surrounding and including the pixel that is being rendered—using the height and width of the filter. Based on the value of the pixel, mental ray takes the average of every pixel and its surrounding pixels and removes aliasing artifacts.
When you adjust the Filtering settings, the Filter Size value for each filter type defines the size of the filter. Larger sizes make the image softer, smaller sizes make the image sharper.
The selected filter is applied as an algorithm defining a curve that peaks at the center of the sampled pixel.
For more information, see Antialiasing, Sampling, and Filtering Tips & Tricks.
Activating the Jitter sub-pixel samples option randomizes the subsampling pattern, which prevents any potential artifacts from taking on a regular pattern. As a result, they are much more difficult for the naked eye to detect. This makes the antialiasing appear more natural and less interpolated.
Autodesk Softimage v.7.5