who knows it , please tell me?
In phototshop, create a new channel (by default it will be named Alpha 1) select the area you want to be transparent and fill with a straigt black R0 G0 B0, then in RenX in hte material editor in shader tab there is a value box Opacity give it a value less that one ie. 1.0-0.0, the lower the more transparent. that was off the top of my head so i hope i explained it well enough.
it doesn't work, should i change the blend type or advanced setting?
go here http://gendev.origin-network.net/page.php?file=/editing/transparency the part of a skin you want transparent need to be pure black maening Red:0 Blue:0 Green:0. except for infantry skins, that slightly different and there a tuts for that in the same Website.
Thank you very much, i think i can finish my mod soon