EXRENVMAP(1)

✨ EXRENVMAP(1) — General Commands Manual ✨

ok so bestie, welcome to the exrenvmap page 💖 this is from the General Commands Manual section of the Unix world, and it's lowkey the glow-up tool for OpenEXR environment maps. let's get into it 🦋

🌸 NAME 🌸

exrenvmap — for creating OpenEXR environment maps. that's it, that's the whole job description, and she ate 💅

🎀 SYNOPSIS 🎀

exrenvmap [options] infile outfile

💖 DESCRIPTION 💖

okay so real talk: this manual page is a lil quickie — it documents the exrenvmap command briefly, no cap. and here's the tea 🍓: this page was written for the Debian distribution because the original program literally does not have a manual page. so we're all just out here doing our best 🙈

but what does it actually do? exrenvmap converts OpenEXR latitude-longitude environment maps into cube-face environment maps — or the other way around, if that's more your vibe. both directions, main character energy, periodt ✨

💅 OPTIONS 💅

one bullet per flag, all of them, no skipping, we don't do that here 👑

• -o — produces a ONE_LEVEL output file (this is the default, so she's the baseline babe)
• -m — produces a MIPMAP_LEVELS output file (mipmaps!! obsessed 🧚)
• -c — the output file will be a cube-face environment map (default, she's the moment)
• -l — the output file will be a latitude-longitude environment map
• -w x — sets the width of the output image to x pixels (default is 256). and the height? the height of the output image will be x*6 pixels for a cube-face map, or x/2 pixels for a latitude-longitude map. math is math 🫶
• -f r n — sets the antialiasing filter radius to r (default is 1.0) and the sampling rate to n by n (default is 5 by 5). increasing r makes the output image blurrier; decreasing r makes the image sharper but may cause aliasing 😭. increasing n improves antialiasing, but generating the output image takes longer. tradeoffs, bestie, tradeoffs 💀
• -t x y — sets the output file's tile size to x by y pixels (default is 64 by 64)
• -p t b — if the input image is a latitude-longitude map, pad the image at the top and bottom with t*h and b*h extra scan lines, where h is the height of the input image. this is useful for images from 360-degree panoramic scans that cover less than 180 degrees vertically 🌈
• -d — sets level size rounding to ROUND_DOWN (default)
• -u — sets level size rounding to ROUND_UP
• -z x — sets the data compression method to x (none/rle/zip/piz/pxr24, default is zip)
• -v — verbose mode (she talks a lot, we love her for it 💜)
• -h — prints these options

ngl bestie, if you forget all of this, just run -h and let the tool remind you. iconic behaviour honestly 🎀

👑 AUTHOR 👑

this manual page was written by Andrew Lau <netsnipe@users.sourceforge.net>, for the Debian GNU/Linux system — but may be used by others, because sharing is caring 🫶

and that's the whole page, bestie!! 💖 this one was from March 31, 2004 (a vintage queen, truly), part of the EXRENVMAP(1) page in the General Commands Manual. go make some environment maps, you've got this ✨🌸💅