(Re)Texturing project, anyone?

@SmileTheory absolute fan of your renderer! Have been remaking heaps of the q3a textures with normal and/or spec maps to suit - though i seem to have hit an issue regarding see-through textures… I’m using png files for all and so far all of them that have see-through bits appear in game as just black. I’ve been using gimp and exporting the png’s so they keep their opaque parts intact when saved. Is there any way around this like writing the scripts in the MTR files i made? I’ve tried that but so far no results - is there specific script lines i need? And if you have them would be great - thanks!