document cost of FSAA

This commit is contained in:
Axel Kohlmeyer
2023-08-17 13:11:41 -04:00
parent f91dc3e68a
commit aedda9513e

View File

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