Test of D2057 Materials: Add custom object properties as usable attributes.
There has been a recent change in blender, that lets you use a custom property of an object inside a material node tree. I put this great change to test, to solve a problem I had in the past. I was doing a video with instructions to assemble a prototype, and I neded per object transparency to animate, and the solution at that time was using node groups, but it was quite time consuming. This is also very common in mograph. Here you have a tutorial to set it up using new patch.
Hope it helps!