I forgot to mention one limitation of my algorithm: the described modification of ldconfig.ldr does not solve the problem of parts with their own colors (printed parts, stickers etc.). To solve even this, one would have to call the renderer with another ldconfig.ldr modification: redefine all colors as HLwhite I described above (white color with white edges) and add HLyellow. Then, do not modify colors of older parts in the model, they become white-white automatically, including their prints etc. Only you need to change is to set a color of last step parts to HLyellow.
And, of course, it is fair to say that this is the generic algorithm only (as all the others in this thread as well) - one needs to solve more problems in the practical usage cases. For example: the last step containing a submodel used in previous steps, too.
And, of course, it is fair to say that this is the generic algorithm only (as all the others in this thread as well) - one needs to solve more problems in the practical usage cases. For example: the last step containing a submodel used in previous steps, too.