Some instructions to the new Terrain Editor update. I hope this is helpfull to the old and new map makers.
There are now ovly00XX.bmp and ovly00XX_a.bmp files that are almost the same as the plb000X.bmp and plb000X_a.bmp files were earlier.
Early there were six (plb0001_a.bmp - plb0006_a.bmp) black and white transition textures, now there are four more (but the new names) because of the new river/lakes textures.
There are also 10 totally new textures from where you pick the transitions. Before this update the transitions were taken from the first sub texture terrr000X.bmp.
THE OLD TRANSITION TEXTURES (BUT THE NEW NAMES)
GRASS transitions (look above):
ovly0001.bmp is the 256 -colour source texture which you use when you create transitions.
ovly0001_a.bmp is the b/w alpha texture. White is shown, black is not visible from the source texture.
SWAMP transitions:
ovly0002.bmp
ovly0002_a.bmp
FARM transitions:
ovly0003.bmp
ovly0003_a.bmp
ROCK transitions:
ovly0004.bmp
ovly0004_a.bmp
FOREST transitions:
ovly0005.bmp
ovly0005_a.bmp
SNOW transitions:
ovly0006.bmp
ovly0006_a.bmp
THE NEW TRANSITION TEXTURES:
RIVER1 transitions:
ovly0007.bmp
ovly0007_a.bmp
RIVER2 transitions:
ovly0008.bmp
ovly0008_a.bmp
RIVER3 transitions:
ovly0009.bmp
ovly0009_a.bmp
RIVER4 transitions:
ovly0010.bmp
ovly0010_a.bmp
THE NEW TERRAIN TEXTURES:
RIVER 1
terr0007.bmp (river WE, look above)
terr0107.bmp (river NS)
terr0207.bmp (river SW-NE)
terr0307.bmp (river NW-SE)
RIVER 2
terr0008.bmp (river NW-E)
terr0108.bmp (river W NE)
terr0208.bmp (river W-SE)
terr0308.bmp (river SW-E)
RIVER 3
terr0009.bmp (river N-SE)
terr0109.bmp (river N-SW)
terr0209.bmp (river NW-S)
terr0309.bmp (river NE-S)
RIVER 1
terr0010.bmp (little lakes)
terr0110.bmp (little lakes)
terr0210.bmp (little lakes)
terr0310.bmp (little lakes)
THE NEW COASTLINES ARE:
terr0000.bmp (water, of course old one...)
terr0100.bmp (coastlines N-S, look above)
terr0200.bmp (coastlines W-E, look above)
terr0300.bmp (coastlines "corners", look above)
Notice that the water and coatline textures are 512 x 512 pixels bmp files but they are covering 1 mile x 1 mile area. All the other textures are covering a quarter mile area!
In the water/land "corners" it seems that the TE use both those N-E / S-W (terr0100.bmp and terr0200.bmp) textures and "corner" textures (terr0300.bmp) together.