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If two or more samples are taken in each pixel, the colors are averaged, and pixels at the edge of the object end up being a color in between the dark gray of the sphere and the background. These in-between colors make the object appear smoother in the final rendering.
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Antialiasing Diagram
The diagram below illustrates the way V-Ray is placing samples when using the Adaptive DMC sampler. The black squares represent the pixels of the image while the dots represent the individual samples. In the first pass V-Ray always places the minimum number of samples determined by the Min. Subdivs parameter. Then the color of samples is compared and more are added where needed in the following passes.
