I am new to Blender and scripting and looking for your help:

The problem: In my scene are many blue objects (e.g. spheres) and multiple cameras. I want to color every surface of the blue objects red, if the surface is visible from at least one camera.

The desired result:

• All objects, that are completely hidden from all camera field of visions, stay completely blue.
• Some blue objects are only partially visible to the cameras and only these visible surfaces turn red (the all other surfaces of the objects remain blue).
• Blue objects, whose whole surfaces are covered from the cameras, turn fully red.

How could you easily implement that?