Rotate bitmaps at random 90 degrees. Not working?

[andre_ravenna]

I am trying to rotate some bitmaps at random, But i only want them to rotate in 90 degree steps and only from their own center. I do this all the time in corona with corona multi map and UVW randomizer. But when I do the exact same thing in vray with Vray uvw randomizer and Vray multi sub text I get rotation, but not in 90 degre steps and the bitmaps dont stay centered, I've tryed different combinations of element, id, inctance and so on. Same thing.
Important. I dont want to randomize the rotation of 3d geometry just the textures, Any thoughs without useing unnecessarily complex solutions?

[hermit.crab]

Use the "Steps" parameter for the UV Rotation. A value of 4 means 4 steps (360/4 = 90 degrees). Check the attached scene.

[andre_ravenna]

Ok thank you, That was my mistake.