The vanishing forest....

i want something like this
when the character is far away from the forest , he can see that theres no way to pass , but when he comes closer some trees vanish
hwo to make something like that?
im kinda not sure if I shcould make it so that once you get back to the same area the illusion trees schould be bakc or not?
anyhow to make this ?

simple just have the trees (distructibles) removed when unit enters region.

ok but what if i want them to return?

i could also make 2 tree types
illusions
and the real ones
the unit come within X range of the illusion it vanishes

mmm i have an idea..

use a unit with tree's model and put them only in the zone u what to do that illusion. once the unit acquires a target (event) order him to get invisible (there's lots of actions to do this).
do you undestand the idea? well.. anyways.. i would use another.

use the unit with the tree's model again. the same way. But this time, with no triggers. no targets, nor spells. just set the property (pathing size) or something like that... in the object editor. Set it to 0. So... the units are able to walk through, but how would the player know?
what u think?

gl!
(excuse me for my english if i wrote something wrong)

You don't need any crap about casting invis, simply, make a unit a tree, give it no move speed, and the locust ability, and no pathing. Now, when that unit gets to those trees use the animation trigger - set vertex coloring on that, is a transparency percent, have it set higher and higher with waits untill the units completely ivisible.