Hi Gisa
I have played around a bit with Trunda's trees trying to get them into native mode. The problem is that the alpha images are black and grey. To work in Native mode they must be black and white. The fix is reasonably easy, if somewhat time consuming. You must load the alpha image for each asset into a graphics program and make it black and white. Most programs have a tool for this, but I found the quickest way was to crank the contrast up to 125%.
There is - of course - a downside. I have no idea what the technical issue is, nor can I even guess whether this is a purely local issue or if it is universal, and it could even be that it is my method of correcting the alphas which is at fault. Anyway Trunda's trees as supplied have a sort of 'softness' to them. My pure black-and-white alphas made them very 'hard-edged'. So now they work in Native, but look significantly less attractive than the as-supplied trees look in Compatibility.
And even if it did work, for a distributed route there is no way in the world I could expect every end-user to do the conversion to over 100 assets. As they say -
you pays your money and you takes your choice.
For me the choice is Trunda's trees used as-supplied in Comp Mode...
Andy