Thanx a lot, it´s first time I see the answer !! To be more precise, and for those who work in other units than inches like in Europa, let's take an example : Wood parquet floor in SU : go and check texture size by clicking on Edit in SU Materials. I work in cm, so it tells me : 304.8 cm x 121.9 cm. You convert in inches (1 inch = 2.54 cm), or for lazy bums, you go and change units in Model info / units. So it turns that texture size is 120" x 48". Take the smaller value, and inverse : 1/48 = 0.02 Fill in Repeat on 3 axis (even though this a 2D image) : X 0.02, Y 0.02 Z 0.02 And that´s it !

@pololo said: but, it will be awesome to have a shadow matte in vray sketchup. There are some Shadow channels - you even see one of them in the screenshot. Don't remember what the various do though.