here's a segment .fps
;Segment Spec
;Header
partmax = 0
lastmeshmax = 0
;Segment Parts
partmode0 = 0
meshname0 = meshbank\s812\terrain\floor4.x <--- this is the segment model
offx0 = 0
offy0 = -50
offz0 = 0
rotx0 = 0
roty0 = 0
rotz0 = 0
texture0 = texturebank\ww2\floors\grass\f_z_01_d2.tga <--- this is where you change to your texture
textured0 =
texturen0 =
textures0 =
transparency0 = 0
effect0 =
colmode0 = 1
csgmesh0 =
csgmode0 = 0
csgimmune0 = 1
lightmode0 = 0
multimeshmode0 = 0
materialindex0 = 2
;Segment Visibility
visoverlay = 0
visfloor = 0
visroof = -1
viswallb = -1
viswallr = -1
viswallf = -1
viswalll = -1
viscornertl = -1
viscornertr = -1
viscornerbr = -1
viscornerbl = -1
;Segment Blueprint
mode = 1
symbol = 0
floorsizey = 1
sidesizex = 100
sidesizey = 1
sidesizez = 100
groundmode = 2
kindof = 0
;end
so you can see what to change
and you need a 64x64 bmp with the same name as the .fps
the .bak files aren't needed