From aedda9513e55ae82443f5f3b9fe6f1baa6dfd9c7 Mon Sep 17 00:00:00 2001 From: Axel Kohlmeyer Date: Thu, 17 Aug 2023 13:11:41 -0400 Subject: [PATCH] document cost of FSAA --- doc/src/dump_image.rst | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/doc/src/dump_image.rst b/doc/src/dump_image.rst index 2aec55bb60..4eaff739d2 100644 --- a/doc/src/dump_image.rst +++ b/doc/src/dump_image.rst @@ -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. ----------