DRD Team

I've never really done any work with 3d floors before and really want to add them to my current map, but whenever I try to make them theres always a part on the bottom that you can see through. Heres a screenshot that shows what I'm talking about:
http://img502.imageshack.us/img502/3185/darkmp12on.png

The answers probably something obvious, but I'm too lazy to figure it out on my own right now, so does anyone know how to fix this?

What arguments are you using on the 3D floor line?

The arguments are 6(sector tag), 1(type), 0(flags), 255(alpha), 0(hibyte).

Check the heights. If there is a gap they don't match properly.

I don't know, the heights all seem right to me. The sector the 3d floor is in is 256 units tall, the floor is at 0 and the cielings at 256. The control sector is 32 units tall with the floor at 96 and the cieling at 128.

Which version of GZDoom are you using? Cause that looks like a rendering glitch that was in one of the previous versions of GZDoom, but was fixed. Try downloading the latest version and trying it. If that doesn't work... Then I have no clue.

What about the neighboring sector? Does its floor height match the 3D floor's bottom?

Well it looks like BetaSword was right, I forgot to update the version in my In Progress folder. Damn I feel like an idiot now