things i've considered: 1) separating the object by material, calculating the borders for each, then somehow masking/compositing it to make it work in post. 2) pic related, a fresnel method of generating borders, which i think looks like shit. 3) grease pencil object, which also looks like shit. i'd really just like to recreate the method they were using in the 90's, which has gotta be inverted hull, yes?