the one way i know how is to make a line that traces the wall edge (and then shrink it so its inside the front wall) and place it in between the two walls.. Then give the line some thickness, go to enable in renderer, and enable in viewport and check those two boxes in the modify pannel. once you have a good thickness for the rope, assign a vray light material to the rope, play with the settings and poof! there you go!

Good luck!

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MuS@shiROth

You could also put a vray light material on the ploygons that are set back behind the wall.

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[Link to www.3dprevis.com]

thanks guys....

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i wish i can do that too......
i need more practice....

haha! that's a great way to do it! and simple!

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MuS@shiROth