"steps" after using highmaps

[battje]

hi
i made a landscape in GC2 and exported this to heightmap. Then i imported this to 2 different rendering programs Terragen 2 and Torque 3D game engine... However im getting a strange "steps". I tried like 5 different landscapes but all had the same thing.
I'm a newbie so i probably doing something wrong. is there anything i can do about that ? or that is because im using demo version ?

my height map generated by GC2:
http://i995.photobucket.com/albums/af79/battje/sd.jpg?t=1259002622

Terragen 2:
http://i995.photobucket.com/albums/af79/battje/HoC7.jpg?t=1259002631

T3D game engine:
http://i995.photobucket.com/albums/af79/battje/HoC6.jpg?t=1259002812

Kind regards
Tomasz

[cajomi]

Hi,

the is a special tab for exporting heightmap, second tab (Ter for Terragen) and there are no stairs visible.
Bmp is the format for all tools, 8 bit.