HL2 Textures

I have been beating my head against the wall so hard I cracked it. Why is it when I make a wall out of 2 sections, a bottom section with one texture and a top section with another texture that I get a thin black line between the top and bottom section. I tried compiling and it shows up in the game as well. Looks crappy. Refer to the screenshot below. See the thin black line around the middle of my walls? How do I fix this? Remember my wall needs to be of 2 seperate textures.

Are the brushes definately flush against each other? If so, its
possibly to do with one or both of the textures being one or two units
misaligned. Make sure the bottom brushes' textures are aligned to top,
and the top brushes' textures are aligned to bottom, and hopefully it
should fix it.

Select the bottom face and increase the Y scale by .01 and align to the
bottom of the face. OR you can simply shift the Y offset up by 1 unit.

When textures are rendered, they are also filtered (billinear,
trilinear, etc.) by the renderer. Notice that the bottom trim of the
texture is black. In this case, the texture was being filtered from the
bottom to the top (for when the texture vertically tiles). Thus, when
the texture is filtered, the black trim is slightly blurred below,
which ends up being the top when vertically tiled... Not sure if that
explanation made sense. :smile:

Ok that helped to hide it on close range but from far away it still shows a hint of the line. I moved the top down one unit and the bottom up one unit. Both are at the 0 mark on the X axis and both are set to world.I also have the other edges (the ones you can't see) like the backside and the sides set to nodraw.

Ok I managed to work around it I think. What I did was make both the top and bottom brushes the plain plaster texture that is in the same group as the ones I was using. Then I made a brush at the very top and the very bottom of my wall exactly the same size as the trim areas of the texture one unit tick and placed it directly infront of my wall. Its more brushes for one wall but having one wall behind the trim with the same solid texture makes sure the line won't show up I guess.

Of course, Valve didn't use any of these tricks. You can clearly
see the black lines in dm_overwatch. Honestly, I don't even
notice them while playing. I don't think it's quite the problem
you might think it is.

CJ's answer was correct you goof. It's called texture scaling, and it's important so you should figure it out now.

Actually Yak the reason I marked it incorrect was because I tried it to the tee and I still saw thin lines no matter what I did. If it worked I would have marked it correct ya think?