If I don't make mistake, it depends of the GPU, platform, graphics API, and compiler you are using. On Nvidia (according to my research) = (inf, .5, inf), but in Intel it's (NaN, .5, NaN). So you must be explicit with "controlled" inf value or put a "almost zero" safe value if zero

It's available on both itch io: hennotheo.itch.io/unstable-wor... or on Ludum Dare website (ld's website sometimes has issues, so Itch io is a better option) ldjam.com/events/ludum...