How to manage Texture appearance on Sketchup V ray

[GoncaloMaba]

Hi Guys

I am new to V ray plug in for sketchup, I was aplying v ray materials to components, materials made by textures photos, bitmaps. I wonder how to manage the appearence of it on surfaces, for example to produce the random effect in certain cases, like grass for example, avoiding the tile repitition look. Is there a way to make this?

Also i have a problem with the lights, I create lights but they don't show up in renders, and when trying to increase the intensity v ray won't let me put more than 0.00.

Thank you for your attention.
Cheers!