bump maps.

I know I can use a background material but as far as I know this doesn't have a bump map slot in the attributes.

Basically I want to comp a 3D character into some live footage but I want to be able to use the live footage as a texture too, to create colour and bump on the shadow catching objects, floor/walls ect. So that the shadows that the 3d character creates react more realistically with their surroundings.

I thought that if I could render out these objects so that they receive shadows but no other light properties like specular/diffuse. Then I could simply render the objects out and place them in the live footage without any difference in their appearance compared to the original footage.

Anyone have any good advice.

Pete B