If you try to play MDKD3D in Windows XP you'll see what I mean, Davros. On Vista/Win7 there are several rendering problems in older games with later drivers. Is this your case, Cliche?
16bit dithering is usually a problem but undying has a 32bit mode
Guardian of the Sacred Five Terabyte's of Gaming Goodness
So it turns out to be a Lighting (Lightmap) issue. It was not a texture issue after all.
From Wikipedia:
A lightmap is a 3D engine light data structure which contains the brightness of surfaces in a video game.
Well in my case (using the Glide renderer), the brightness of surfaces on all of the mirrors and some other textures were set to be so dark that's why I got mirrors which were pitch black.
When I use Scrye the mirrors actually work because they got illuminated by Scrye.
And here's what I got by turning lightmaps off.
w00t 😁
nGlide 0.95 changelog:
...
-fixed Clive Barker's Undying black mirrors and textures bugs
...
