Sorry to have not carefully read your post, Guitta. ;=) One problem with Vue is the difficulty to know what will be the effect of modifications we do (rescale, rotate, translation...)since ot's not cleat what is y or x or z axses for the object or even for the scene. Same problem arise for the terrain , where is the north, the right : if we dig or raise on a side of a terrain, will it be at the side I want. That's to difficult to understand , so I only work with trial and errors and lost a lot of time. Should I see on some help file one time ? :=) Yves