To make interiors texturing, I usually use the cube projection, it works pretty well and is fast, I love how I can unwrap separated meshes floors with cube projection and everything looks seamless as you can see in the image:
But sometimes, texture is not aligned as I would want, in this case, if I would rotate 90 degrees, could be easy, just go into edit mode, select all the faces and rotate them 90 degrees in the uv image editor. But now, I have another mesh that I should rotate the floor texture, if I do it, then the texture is not aligned and seamless:
I know I can edit texture space with SHIFT + T, but there is no way to rotate it, only move or scale it.
Is there an easy way to maintain the texture space for different objects but rotate uv space 90 degrees?