@Espér no it isn't invisibile :p

@Quadraxas when i've imported the model to the MED the texture was a jpg, and now it should be included in the mld file, isn't it ?
indeed, in WED viewport i can see the building and the texture.

@MegaMarioDeluxe actually i'm using the "3td person camera" linked to the kight mesh, it's just for testing it, i've walked a bit far and near the site where the building is supposed to be, but nothing happen, no blink no flash, nothng

it looks like the engine didn't render the buildings, i've worked all night on it to weld vertex and check faces..

btw i realy appreciate the fast reply thnx all