Turning wall textures upside down is possible??

[SOF2Fragger]

I accidentally turned a wall texture upside down. I had always been told this was not possible.

I wanted to mirror a texture, so I put a minus sign in the scale, and the texture turned upside down. Then, I noticed the minus sign was on both width and height.

 

Is this new. Pardon my noobness. 

[ViolentBeetle]

I guess you use UDMF format or something along those lines? Scale is not a thing in vanilla and up to boom, that's probably what you heard.

[SOF2Fragger]

Yes. UDMF.

[Aurelius]

There is a Link values button next to the scale options that links two values on a given row. If you want to modify scale on one axis only (in this case, mirroring in the horizontal), make sure the values aren't linked.