Ironfist, I've just been playing around with partial transparency lately. I used the rust tutorials. I think the site is
www.game-design.net or something. Just search for rust tutorials or something. Anyway, you can follow that tutorial, just change the transparency color they give to whatever the DP transparency color is. That was one of your questions, wasn't it. I'm not sure of the RGB, but I think its cyan. Its the last color on the color palette. As far as sprites. I've always thought that those flat textures to mimic tall grass and brush looked really cheap and not realistic. I'm not a big fan. But in that tutorial, you can see how you might make something like that. They make a cob web. basically all sides of your brush would be have a transparent texture and then the one side would have a partial transparency. Hope that helps. In a little blatent self promoting. I've made some partial textures that look really nice (at least I think so). I made a chain link fence one that I like and a couple of grating textures. Let me know if you want to see them. Oh yeah. I'm still looking into the difference between jpgs and wals, but I just made wals since you need that for BSP anyway.