http://angel-death.newmail.ru/MM/mm_mapviewer.rarunpack into game folder and launch mm_mapviewer.exe
setting in config.ini:
[Video]
Width = 800 - resolution
Window = 1 1 - window mode 0 - fullscreen
Freq = 75 display frequency
Bpp = 32 color depth
[Game]
mapname = maps/d01.blv - map loaded on start
keys:
WSAD - move
SHIFT - +speed
L - load map
ESC - quit
P - toggle portals (only blv maps)
MOUSE1 - select BModel (only ODM maps)
MOUSE2 - select Face
h - hide/show selected bmodel
j - reset hided bmodels