...as the title says, unless there's already a way to do it?
Nope. You have to use a mask texture in the transparency slot - linked to the diffuse map, and set to "Alpha"
Okay, now if i do that the OpenGL preview shows the whole object as transparnent, and it crashes Neon.
It shouldn't do either of those things! Can you send me the rmtl file of your material?
Yep appears to be....so yeah, a one-click solution for doing this would be nice, and if it applied it to the specular level slot too and any other applicable slot so that the beginner isn't wondering "Where did that come from I thought it was transparent there?"
Andrew le Bihan said:
This should all now be fixed in the latest Neon and the latest Brazil.