Another Trees problem

Hi guys, not sure if someone already fixed this (probably yes) but I have a problem with the trees as the screenshot say:



I know is a common problem but didn't find the solution yet
How to fix it?
Need to import on 3ds max? And then?

 

Thanks Luc, I will try

 

tried but nothing has changed, what I have done wrong?

 

ok thanks, but now another problem appear (probably 3dsimed related): to import the rf2 gmts to 3dsmax I open them with 3dsimed, save as rfactor 1 gmt and then import to 3dsmax with the importer (because there isn't gmt2 rf2 importer yet??) but they become invisible, see picture:



Same happen if i import them on 3dsimed, just changing to t1 shader and they disappear
Ingame they 'look' invisible

 

export as .3ds from 3dsimed and then open in 3ds max.

 

tried but still the same

 

edit: nevermind...didn't originally see that the original issue had been solved (sort of).