The Anti-alias from 1 to 13 option specifies the number of rays per pixel that the raytracer should fire to determine the final color. Use this option to reduce the jagged edges of surfaces that should appear smooth.
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To simulate the ModelView settings of low and high anti-aliasing, use 3 rays for low and 9 rays for high.
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We recommend setting this control to 1. At a setting of 1, only a single ray is fired into each pixel, and that ray goes directly into the center of the pixel. As a result, objects that are only partially displayed in the pixel may be missed.
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Increasing this option slows the performance speed of the raytracer. However, increasing anti-aliasing from 1 to 2 does not necessarily double raytracing time. It depends on whether or not the second ray hits an object and has to spawn additional rays. The following illustration shows where all the rays are fired as you increase the number of rays through anti-aliasing.
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Because the effect of these settings is different for each model and material in the model, you are encouraged to modify these settings and re-run the raytracing command several times to get the effects that you want.
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Although the raytracer supports an anti-alias setting of up to 13 rays per pixel, additional rays are fired only if the primary ray determines that potential additional intersections in the ray cone exist. This method prevents unwanted and time-consuming rays against flat surfaces.
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The software does not support Anti-alias if you have enabled Ambient Occlusion or Outlining (with a width of value of 1) view settings.