Help! Grime on tiling wall

3D4D

Simple expample would be this, see image below. I have a tiling wall texture, and a picture frame. I want to add detail to the wall around the frame, like AO and grime and weathering to make the frame feel more grounded to the wall. My wall texture is tiling so i can't add the detail there as it will tile badly. Where do i add my detail. I guess i could you alpha overlays but not sure if i can get a nice Ao around the edge.
I also plan on presenting this in marmoset. Any ideas on my best options. Thanks

[Deleted User]

Alpha map technique sound promising. Do it.

If were going after this in 3ds max/vray, id create two shaders. One for the new/clean texture and the other for the grimey/dirty texture. Feed those into a vray blend material, add dirt map (play with radius amount and for same object only) to the blend amount slot and attach bitmap to radius and unoccluded slots.

3D4D

if i were to do this in UDK, would that be easier? Ive heard you can paint dirt on, im guessing thats with some sort of vertex masking?

sargentcrunch

n/a