Thanks for the reply, Sowinski. I don't really have any trouble with the camera settings. My salesperson uses his iPhone 3GS, which has an effective focal length of 37mm. The rest of the settings are saved in EXIF data in the JPG, such as the f-stop, ISO, and shutter speed. I just use those settings in the V-Ray Physical Camera.
My problem lies in lighting the scene. I've been using either a V-Ray dome light with an HDRI or a V-Ray sun, depending on whether the photo was taken on a cloudy day or a sun-lit day. I use the salesperson's photo as an environment background and display it in the viewport.
I then create a plane to represent the wall where the channel lettering (or whatever) is going and try to set the camera up at about 70" from the ground and about where my salesperson was standing in the photo. Once I've got the perspective right, I give the wall a VrayWrapper material and set it up so it's like a Matte/Shadow material, so that it can catch shadows and lights and look like the objects are casting shadows on the background image.
So what is the best way to light & render the scene using V-Ray so that my Max-created objects will look like they're a part of the background photo? I guess what I'm trying to do is a sort of rotoscoping.
