document cost of FSAA
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@ -965,8 +965,11 @@ The *fsaa* keyword can be used with the dump image command to improve
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the image quality by enabling full scene anti-aliasing. Internally the
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image is rendered at twice the width and height and then scaled down by
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computing the average of each 2x2 block of pixels to produce a single
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pixel in the final image at the original size. This produces smoother,
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less ragged edges.
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pixel in the final image at the original size. This produces images with
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smoother, less ragged edges. The calculation of this effect can
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increase the cost of computing the image by roughly 4x or more,
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especially for large images and with large processor counts due to
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increased communication cost.
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----------
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