Textures on Cut Brushes

Hey guys it's been a while but once again I'm back. I'm working
on a new map and basically the problem I'm having relates to an arch
based ceiling I made. When I apply a texture to the different
faces (theres a total of 6 faces covering 180 degrees) they don't
lineup with each other. This diagram might help explain my issue.

<div style="text-align: center;">pretend this is the arch:

3/ \4

2/__\5

1/___\6

<div style="text-align: left;">Ok now Faces 2 & 3 match, similarly faces 4 & 5 match. I believe
faces 1 & 6 are matching but it's hard to tell. For some
reason faces 1 and 6 are displaying the texture in the same angle as
the wall below, but faces 2-5 are rotating the texture 90 degrees and I
think thats the major problem. Anyway to fix this? Maybe its the
angles or something in the cuts?

</div>
</div>

select a face with the texture tool. Alt+right click on the face next to it. Then select that one, and alt+r/click on the next again face, and so on.

ctrl+right click will apply the values to all faces of a brush.

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i eat paint

Well that was sort of the answer to the problem. It did indeed make the
textures allign and much thanks for that. I discovered that the
texture application tool had a rotation option and used that to fix it
meanwhile but couldn't reply to my post about it.

I'm still curious though, why does hammer do this?

i think it takes the face of a brush, and decides what plane it is best aligned to, and then applies the texture values relative to that plane. when the faces of the inside of an arch rotate away from one plane to another, then hammer will do some texture rotating of its own, to try and keep up with it.

at least that's my take on it, and will probably be as far from the truth as a piece of string is long.

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i eat paint