Idea: Highlighting new parts in a step

[Jaco van der Molen]

Maybe I am asking too much at a time, but I really want to share this thought...

Reading the review of the Ghostbusters Firehouse on Eurobricks (http://www.eurobricks.com/forum/index.ph...pic=118783) I saw something interesting I've been wondering about before.

LEGO uses highlighting to show what parts a new in a step.
Like this


They've done this occasionally before (in the long past and I think with some monthly minibuilds) and I think it would be nice to be able to do this too?

Would something like this be possible to implement in LPub3D?
Or use some other software to pre-process an LDraw file that creates lines around the parts of a step?

I've done this in some instructions by hand (not every step) where it was really hard to see where parts went in a certain step. This is often the case with a monochrome model or when one uses many black for instance.